| Observation Date |
Observation Time |
Precipitation |
Snowfall |
Snowfall SWE |
Snow Depth |
Snow SWE |
Notes |
| 10/1/2009 |
10:00 AM |
0.01 |
M |
M |
M |
M |
light showers passed through the area in the late morning to mid-day while I was at work |
| 10/2/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 10/3/2009 |
1:30 PM |
0.04 |
M |
M |
M |
M |
rain fell Fri late evening |
| 10/4/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 10/5/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 10/6/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 10/7/2009 |
10:00 AM |
0.03 |
M |
M |
M |
M |
|
| 10/8/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 10/9/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 10/10/2009 |
2:30 PM |
0.05 |
M |
M |
M |
M |
light rain overnight around midnight and again very light rain in the morning to mid-day. All rain done by the time of obs |
| 10/11/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 10/12/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 10/13/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 10/14/2009 |
10:00 AM |
0.00 |
0.0 |
M |
M |
M |
Had to remove a leaf from the funnel. |
| 10/15/2009 |
9:25 AM |
0.21 |
M |
M |
M |
M |
Very light rain at time of observation. Light rain began approximately Wednesday afternoon. |
| 10/16/2009 |
9:00 AM |
0.33 |
M |
M |
M |
M |
very light rain at time of observation. Nearby co-op observer (station DW1357 on APRSWXNET/CWOP) reported 0.44 for the same period, so even if I had an undercatch due to nearby trees (no canopy is directly overhead of my gauge), my area appears to have actually received considerably less rain than all of the surrounding reporting locations.
Despite the nonconvective nature of the precipitation, it was organized into bands, which could explain local variability, and apparently my site is in the area of minimum. |
| 10/17/2009 |
11:00 AM |
0.70 |
M |
M |
M |
M |
light rain at time of observation |
| 10/18/2009 |
11:45 AM |
M |
M |
M |
M |
M |
I had more than an inch and I bumped the outer cylinder when trying to pour the overflow into the inner cylinder, and most of the remainder spilled out. I measured 1.09 but have spillage of approximately .2 as a very rough estimate, so my total is approximately 1.3, but I do not have a proper measurement. I know for sure that it is more than the 1.09 that did not included the spilled water, and it is less than 2.00 because there wasn't that much which spilled.
No precipitation was falling at time of observation. |
| 10/19/2009 |
10:00 AM |
0.02 |
M |
M |
M |
M |
|
| 10/20/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 10/21/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 10/22/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 10/23/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 10/24/2009 |
11:15 AM |
0.04 |
M |
M |
M |
M |
|
| 10/25/2009 |
1:00 PM |
0.78 |
M |
M |
M |
M |
Light showers began around 3pm, followed quickly by several brief heavy showers, and later by one more with a rumble of thunder. |
| 10/26/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 10/27/2009 |
10:30 AM |
0.59 |
M |
M |
M |
M |
No precipitation was falling at the time of observation, but some did fall at times later than the times observations were taken at other sites in the area. |
| 10/28/2009 |
9:40 AM |
1.23 |
M |
M |
M |
M |
Rain ended prior to observation |
| 10/29/2009 |
8:00 AM |
0.00 |
0.0 |
M |
M |
M |
Late obs yesterday allowed rain to finish before measurement, so none during this period |
| 10/30/2009 |
9:30 AM |
0.00 |
0.0 |
M |
M |
M |
dry. reports of drizzle around the area abound and may have occurred while I was not paying attention |
| 10/31/2009 |
1:00 PM |
0.02 |
M |
M |
M |
M |
|
| 11/1/2009 |
12:25 PM |
0.59 |
M |
M |
M |
M |
light rain at time of observation. some rain fell between time of most other area obs and my obs, so best to compare 2-day totals tomorrow. |
| 11/2/2009 |
9:30 AM |
0.04 |
M |
M |
M |
M |
Late observation yesterday caught most of the 2-day event. |
| 11/13/2009 |
9:56 AM |
0.08 |
M |
M |
M |
M |
light drizzle at time of observation |
| 11/14/2009 |
12:00 PM |
0.23 |
M |
M |
M |
M |
morning light rain and drizzle had ended before observation time |
| 11/15/2009 |
12:00 PM |
T |
M |
M |
M |
M |
|
| 11/16/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 11/17/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 11/18/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 11/19/2009 |
9:15 AM |
0.02 |
M |
M |
M |
M |
|
| 11/20/2009 |
8:20 AM |
0.60 |
M |
M |
M |
M |
2 somewhat heavy brief thundershowers around 11pm with a modest amount of sharp lightning and robust thunder. Ground wet beforehand from very light rain or drizzle earlier in the day, but most or perhaps almost all of the precip was from the evening thundershowers. |
| 11/21/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 11/22/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 11/23/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 11/24/2009 |
9:30 AM |
0.93 |
M |
M |
M |
M |
No rain at time of observation. Ground soggy with puddles. |
| 11/25/2009 |
8:25 AM |
0.14 |
M |
M |
M |
M |
drizzle or very light rain at time of observation |
| 11/26/2009 |
12:00 PM |
0.08 |
M |
M |
M |
M |
no precipitation at time of observation |
| 11/29/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 11/30/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 12/1/2009 |
9:20 AM |
0.23 |
M |
M |
M |
M |
|
| 12/2/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 12/3/2009 |
10:00 AM |
0.81 |
M |
M |
M |
M |
|
| 12/4/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 12/5/2009 |
12:00 PM |
0.38 |
M |
M |
M |
M |
Snow on ground (less than 1 inch) in areas not under significant tree cover, and slush (not slippery)on street in front of house and sidewalks. I put frozen board out just now to measure snow accumulation - unfortunately missed the beginning. Will measure and report snow depth after precipitation ends. |
| 12/6/2009 |
11:00 AM |
0.25 |
1.0 |
M |
T |
M |
Mostly a frozen sheet inside the outer cylinder (since I removed inner for snow). This makes storm total 0.63.
Areas under trees did not accumulate snow on ground. Snow fell mixed with rain throughout afternoon until after dark, with moderate snow and gorgeous large flakes around 6pm. Ground never accumulated even 1 inch. The 2x4 which I stored in my freezer and then placed out in the yard did not help - the snow melted on it, and actually more accumulated on my hail pad, though still barely an inch max. By morning, snow covered only 60% or less of the ground. |
| 12/7/2009 |
8:30 AM |
0.00 |
0.0 |
M |
T |
M |
Extensive bare spots but ground still more than 50% snowcovered, mostly in exposed unpaved areas. Snow depths in areas with snowcover are very small, less than 1/2 inch. |
| 12/8/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 12/11/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 12/12/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 12/15/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 12/16/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 12/17/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 12/18/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 12/19/2009 |
3:30 PM |
0.99 |
14.0 |
0.99 |
14.0 |
0.99 |
precip is melted core average of 4 samples. It was still snowing moderately at time of observation and continuing for several more hours up to the present, with another inch or two since the measurements. Snow was light - shoveling loads were not as heavy per shovel full as they often are here. |
| 12/20/2009 |
12:00 PM |
0.26 |
4.0 |
M |
17.0 |
1.54 |
Four more inches fell after yesterday afternoon's observation. The liquid equivalent for today is from melting the contents of the outer cylinder, which I emptied yesterday. Total on the ground is 17" due to settling. Yesterday, some compaction may have occurred - peak snow depth was 18" but possibly more may have fallen.
Melted core average over samples in the most exposed, undisturbed areas contains more than my gage total for the two days, indicating gage undercatchment. The best estimate of storm total is from the melted core. |
| 12/21/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 12/22/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 12/23/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 12/24/2009 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 12/25/2009 |
12:00 PM |
0.00 |
0.0 |
M |
7.0 |
M |
No rain yet. Snow depth measured in the most undisturbed exposed areas only, but these are on the north side of the house, so shadowed and thus may be higher than an area average. Other areas have tree cover - snow falling out of trees diminished the depth, and lots of foot traffic, snow piles from shoveling and plowing, etc. |
| 12/26/2009 |
12:00 PM |
1.00 |
M |
M |
T |
M |
Light rain - fine spray - at time of observation. Inner cylinder filled but only trace of overflow into outer cylinder - a perfect 1.00".
All snowcover has completely melted except for piles created by shoveling and plowing. |
| 12/31/2009 |
10:00 AM |
0.28 |
M |
M |
0.5 |
M |
Precipitation had ended prior to observation time. Accumulation of sleet forming a light crunchy crust, rather uniform at around 0.5 inches thick. Some liquid collected in inner cylinder but funnel was obstructed by sleet accumulation - no spillage, nothing lost - took inside and melted, included in gauge total. |
| 1/1/2010 |
1:00 PM |
0.20 |
0.0 |
M |
0.0 |
M |
All precip was in the form of rain. |
| 1/2/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/3/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/4/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/5/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/6/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/7/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/8/2010 |
7:45 AM |
0.09 |
2.1 |
M |
2.0 |
0.10 |
Light, fluffy snow! 3 core samples totaled .31" melted. Snow was very uniform at just over 2 inches depth. Precip ended before observation time. |
| 1/9/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/10/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/11/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/12/2010 |
10:00 AM |
T |
T |
M |
T |
M |
Light dusting of snow on cars by 8:30pm but nothing on walks or roads. In morning, it was all gone and nothing found in gauge. Thin veneer of snowcover from last week still widespread in shadowed areas but snow completely gone everywhere with some sun exposure. |
| 1/13/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/14/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/15/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/16/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/19/2010 |
10:00 AM |
0.01 |
M |
M |
M |
M |
Brief rain shower this morning, enough to wet the ground. Rain fell, not dew. |
| 1/20/2010 |
9:00 AM |
0.02 |
M |
M |
0.0 |
M |
precipitation fell this morning. Did not observe it falling, thus cannot record the type that fell. No snow or ice remains on the ground, so if any frozen precipitation fell, it melted on contact or shortly thereafter. |
| 1/21/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/22/2010 |
9:45 AM |
0.12 |
T |
M |
0.0 |
M |
Precip had ended by time of observation - sidewalk already mostly dry. Sleet and rain mixture starting around 8:15pm. I did not see any sticking or accumulation of any frozen precipitation at any time on any surface including tops of cars, but I may have missed something during the night. |
| 1/23/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/26/2010 |
10:00 AM |
0.08 |
M |
M |
M |
M |
|
| 1/27/2010 |
9:00 AM |
M |
M |
M |
M |
M |
Tuesday afternoon virga with some light rain/snow reaching the ground in the metro area. Forgot to check gauge in the morning Wednesday. In the evening, gauge was dry. May have had a trace Tuesday afternoon or may have had zero. |
| 1/28/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/29/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/30/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 1/31/2010 |
10:30 AM |
0.22 |
6.0 |
0.37 |
5.5 |
0.37 |
Snow depth at gauge measured slightly under 5.5", the same as typical in other spots. Under trees, depth was typically around 4", ranging from just under 4" to just under 5". Yesterday measured 5.8" depth and continued to have light snow, so estimating total accumulation of 6.0" and settling prior to this morning's measurements. Melted cores averaged 0.37", so gauge had substantial undercatch despite depth beside the gauge being about the same as the depth where the cores were taken. |
| 2/1/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 2/2/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 2/3/2010 |
8:45 AM |
0.27 |
5.0 |
0.31 |
6.5 |
0.53 |
Moderate to heavy snow around 8:30pm-12am (lighter snow began earlier) with beautiful steady fall of rather large (not gigantic) flakes. Snow is "wet" and sticky, not at all powdery, but it was light to shovel thanks to the low water content - apparently the crystal structure or aggregation resulted in large spacing but it is warm enough for some joining of flakes to make a sticky texture. Melted amount in gauge was only 0.27 while melted cores from areas previously cleared was 0.31 despite some likely melting and runoff during the early evening when the snow began. Melted core of total snow is less than sum of the new snow and the previous snowfall water content, indicating sublimation over the past few days. |
| 2/4/2010 |
9:30 AM |
0.00 |
0.0 |
M |
2.0 |
M |
Few bare spots already, up to 3" still on ground in shadows, 2.5" in exposed areas with some shadowing, best guess of area average is a little over 2". |
| 2/5/2010 |
10:00 AM |
T |
T |
M |
1.0 |
0.57 |
Very light snow falling at obs time, beginning of the big storm coming later today. Snow cover completely gone from south-facing exposures but up to 3.5" deep in even exposed open undisturbed north-side areas, though most are around 2". Area average including bare areas is definitely less than 2", best guess is a bit more than 1". I took core samples from the more shadowed areas not disturbed by shoveling and was surprised at the high average core content - higher than I measured a couple days ago. |
| 2/6/2010 |
5:00 PM |
3.07 |
23.0 |
3.07 |
23.0 |
3.07 |
Precip mostly ended by obs time, with some very light snow showers intermittent while collecting samples and measuring, so data represent storm total!
Melted cores came to 3.07" average - gauge picked up well lifting off the ground but were very difficult to extract from the gauge, tightly packed in. Did not use the gauge collection as it was deeply buried. Snow depth in most of back yard under trees or in lee of house was around 19". Front yard under tree also around 19-21". More exposed areas were 22 to 24 inches, and some drifting left areas ranging from 19 to 29 inches, did not find any spots over 30" but quite a few were 27-29". Cars had 15" to 20" in the piles on top of them. Brick retaining wall had 18 to 20" on it while neighbors yard a few inches on the other side had 27" - snow cover appreared flat but retaining wall sticks up above the ground a little. Snow was definitely denser toward the bottom, possibly due to compression or possibly due to the nature of the hydrometeors. Snow early in the storm had large wet aggregates, very complex looking. In the late morning today the flakes were not as asymmetric or enormous though somewhat large and more typical pretty snow, probably dendrites. Later in the day, snow became very fine, small flakes and varied from light to moderately heavy as bands passed through. |
| 2/7/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 2/8/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 2/9/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 2/12/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 2/13/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 2/14/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 2/15/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 2/16/2010 |
9:00 AM |
0.03 |
T |
M |
12.0 |
M |
.03 is from melting gauge contents. Snow fell beginning a little before 3pm and for a while became moderate with pretty, somewhat large flakes. All melted on contact as it fell, leaving cleared surfaces just wet - which froze by 8pm, becoming slick in spots. Snow cover now crusted firmly and compressed down to around 12". |
| 2/17/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 2/18/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 2/24/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 2/25/2010 |
8:00 AM |
0.03 |
M |
M |
1.0 |
M |
Ground still more than 50% snowcovered with depths up to 4" (deeper in plow/shovel piles), but 1" was most typical depth, average around 2" where snowcover remains, so 1" for overall average. |
| 2/26/2010 |
9:20 AM |
T |
T |
M |
M |
M |
Flurries at time of obs. |
| 3/2/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 3/3/2010 |
7:30 AM |
0.10 |
M |
M |
T |
M |
I did not see any snow or frozen precip mixed in, just misty fine rain. Some frozen precip may have fallen when I was not paying careful attention, but if any did, it all melted. I was told of spiky hydrometeors landing on the car windshield of someone driving in the vicinity around 6pm, but this was not at my observing site. Old snow on ground is now confined to the most shaded undisturbed spots and to plowing piles. |
| 3/4/2010 |
7:30 AM |
0.01 |
M |
M |
M |
M |
|
| 3/5/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 3/6/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 3/7/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 3/8/2010 |
9:00 AM |
0.00 |
0.0 |
M |
T |
M |
Still have small snow patches on the north side of a solid fence where no sunshine reaches at any time of day. |
| 3/9/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 3/10/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 3/11/2010 |
9:30 AM |
0.00 |
0.0 |
M |
0.0 |
M |
ALL snow aside from plow pile remnants is finally all gone even in the most shaded areas. No precip yesterday - BWI had light rain in the morning and radar showed some in the vicinity - nothing here. |
| 3/16/2010 |
10:00 AM |
0.03 |
M |
M |
M |
M |
Storm total now 2.04" and it's finally over!
Basement is dried out now. Snow is gone and snowmelt has run off or seeped in. Puddles and pools of water have receded though not disappeared. Spring peepers (frogs with a squeaky pleasant cicada-like song) have been heard nightly since the end of last week. Spring is here! |
| 3/17/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 3/18/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 3/19/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 3/20/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 3/21/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 3/22/2010 |
9:20 AM |
0.03 |
M |
M |
M |
M |
No precipitation falling at time of observation |
| 3/23/2010 |
10:00 AM |
0.30 |
M |
M |
M |
M |
|
| 3/24/2010 |
9:00 AM |
0.01 |
M |
M |
M |
M |
|
| 3/25/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 3/26/2010 |
11:00 AM |
0.30 |
M |
M |
M |
M |
4 of my last 5 precip totals were .03, .03, .30, .30
I hope the next doesn't follow in the pattern - that would be 3.00 |
| 3/30/2010 |
11:00 AM |
0.05 |
M |
M |
M |
M |
precip had ended by obs time. Pavement is drying out but grass is still soggy. |
| 3/31/2010 |
9:30 AM |
0.04 |
M |
M |
M |
M |
Shower in late evening sometime before around 11pm |
| 4/1/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/2/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/3/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/4/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/5/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/6/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/7/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/8/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/9/2010 |
10:00 AM |
0.76 |
M |
M |
M |
M |
NNE-SSW line of updraft bases, with each base elongated perpendicular to this line, from DC to directly overhead of downtown Silver Spring at 7:30pm. Winds and heavy rain reached College Park area sometime in the vicinity of 8pm, tapering to light rain which continued well into the night. Ponding of water on streets and sidewalks already occurred by around 8:15 and small branches/twigs were down all over the place. I saw a few flashes of in-cloud lightning and heard one rumble of thunder. |
| 4/10/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/11/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/12/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/13/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/14/2010 |
9:45 AM |
0.11 |
M |
M |
M |
M |
Phenology this spring seems advanced beyond the usual for the date, especially trees, and all the more remarkable after the snowiest winter on record for the area and one of the most consistently cold during February. Spring foliage came out rather abruptly a few weeks ago and now it looks more like May already. |
| 4/15/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/16/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/17/2010 |
12:30 PM |
0.02 |
M |
M |
M |
M |
|
| 4/18/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/19/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/20/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/21/2010 |
9:10 AM |
0.00 |
0.0 |
M |
M |
M |
Rain had not begun as of shortly after 9am. No dripping, no drizzling, nothing yet. |
| 4/22/2010 |
10:00 AM |
0.35 |
M |
M |
M |
M |
|
| 4/23/2010 |
10:00 AM |
0.01 |
M |
M |
M |
M |
Afternoon light rain showers spread across the area from convective towers which formed over the mountains and dissipated as they moved east in downslope flow. |
| 4/24/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/25/2010 |
2:00 PM |
0.16 |
M |
M |
M |
M |
|
| 4/26/2010 |
9:30 AM |
0.48 |
M |
M |
M |
M |
Hail - see hail report for April 25. Brief heavy rain beginning around 10:19 with two brief bursts of hail mixed in, then another brief heavy shower later followed by some light rain. Hailstones were spherical and hard and quickly almost covered the ground before quickly melting on pavement. I saw a modest amount of IC and CG lightning, mostly to the north and then the east.
Day was sunny and steamy nearby in DC, with temperature up to 79 indicated by car thermometer, down to 66 when returned to the house, and below 60 a short while later in early evening as back door cold front slid through on northeast winds. Overcast developed from overrunning of moist airmass over very shallow cool layer and storms in Maryland all tracked over the cool dome, none in the warm sector, though it appears they originated in the warm sector over the mountains. |
| 4/27/2010 |
8:00 AM |
0.09 |
M |
M |
M |
M |
|
| 4/28/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/29/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 4/30/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/1/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/2/2010 |
11:50 AM |
0.02 |
M |
M |
M |
M |
Rain apparently overnight, pavement is still soaked in places now at noon but gauge had just over 0.02" and grass is dry. |
| 5/3/2010 |
10:00 AM |
0.54 |
M |
M |
M |
M |
Rain overnight into the morning, ending before my observation. No lightning or thunder observed here. |
| 5/4/2010 |
10:00 AM |
0.05 |
M |
M |
M |
M |
Afternoon/evening showers |
| 5/5/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/6/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/7/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/8/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/9/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/10/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/11/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/12/2010 |
9:00 AM |
0.14 |
M |
M |
M |
M |
cold, dreary day with light rain |
| 5/13/2010 |
10:00 AM |
0.80 |
M |
M |
M |
M |
Afternoon thunderstorms apparently drenched my neighborhood while I was at the office. |
| 5/14/2010 |
10:00 AM |
0.02 |
M |
M |
M |
M |
|
| 5/15/2010 |
10:30 AM |
0.12 |
M |
M |
M |
M |
Between rapidly-moving thunderstorms. Hail pad shows no new marks. Nearby areas had hail with reports of up to 1 inch in diameter; I was in Silver Spring and saw hail there. |
| 5/16/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/20/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/21/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/22/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/23/2010 |
11:00 PM |
1.08 |
M |
M |
M |
M |
light rain/showers late afternoon Saturday.
Sat night shortly after 3am, enormous explosion-like crash of thunder, followed by very heavy rain, then more crashing (but not as enormous) thunder followed by another heavy shower just before 4am. Overall, not much lightning and thunder, but the one boom at 3am was about the loudest and most explosive-sounding I have ever heard. I later found out that the lightning exploded part of a tree about 200 feet away, though most of the tree was still standing and bark was popped off a large part of the side of the tree yet no bark stripping or burn marks appear on the lowest approximately 15-20 feet. |
| 5/24/2010 |
10:00 AM |
0.01 |
M |
M |
M |
M |
|
| 5/25/2010 |
11:45 AM |
T |
M |
M |
M |
M |
few drops in gauge, possibly sprinkles late morning or mid-day yesterday |
| 5/26/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/27/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 5/28/2010 |
9:30 AM |
0.05 |
M |
M |
M |
M |
All the heavy rain missed. Gust front came through before 11:30, new cells forming along it passed just north and overhead as it formed - didn't mature until just east. Had a good bit of vivid CG lightning with that around 11:30pm and a little rain, then the trailing arm of storms passed through at 1:30am after weakening but still had some lightning. |
| 5/29/2010 |
2:00 PM |
0.15 |
M |
M |
M |
M |
|
| 6/8/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 6/9/2010 |
10:00 AM |
0.02 |
M |
M |
M |
M |
|
| 6/10/2010 |
9:30 AM |
0.08 |
M |
M |
M |
M |
storm total 0.10" |
| 6/11/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 6/12/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 6/13/2010 |
2:00 PM |
T |
M |
M |
M |
M |
Gauge was dry but observed a few drops of rain falling approximately 6:45pm Saturday. |
| 6/14/2010 |
10:00 AM |
0.00 |
0.0 |
M |
M |
M |
Convection all missed my location. Not even a rumble of thunder all weekend. |
| 6/20/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 6/21/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 6/22/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 6/23/2010 |
9:30 AM |
0.07 |
M |
M |
M |
M |
Caught edge of thunderstorm passing by to the north around 8pm and another around 8:30pm. Towers were rapidly evolving and visually crisp/sharp. Saw a few lightning flashes jump out of the upper part of the sides of the towers but overall not a whole lot of lightning. |
| 6/24/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 6/25/2010 |
9:30 AM |
0.00 |
0.0 |
M |
M |
M |
yes, not even a trace |
| 6/26/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 6/27/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 6/28/2010 |
9:00 AM |
0.01 |
M |
M |
M |
M |
Had a little light rain as updraft base passed over around 6pm. Data showed this became a thundershower as it tracked east around Bowie. |
| 6/29/2010 |
9:00 AM |
0.93 |
M |
M |
M |
M |
From Silver Spring, saw very heavy rain shaft fall through the cloud base around 2:30pm, intensify, and expand to the southwest of downtown Bethesda, engulf Bethesda, spread over Rock Creek Park, and pass over my position. The leading edge of rain sheets was blowing along fairly well, probably 35+ MPH, as it fell below the cloud base. A second heavy storm tracked behind the gust front of the first one and a bit to the south of the track of the first one. Neither had a lot of lightning visible from downtown Silver Spring, a little more with the second, and the lightning was primarily toward the rear of the storms. After that, skies cleared and no additional storms developed in the remaining unstable air ahead of the cold front. |
| 6/30/2010 |
9:30 AM |
0.01 |
M |
M |
M |
M |
Thought it was dry but found .01" in the gauge. Grass and street/sidewalk were dry and relative humidity was low even overnight, no dew. I see some other stations also reported this mysterious rain. |
| 7/1/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/2/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/3/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/4/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/5/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/6/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/7/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/8/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/9/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/10/2010 |
3:00 PM |
0.48 |
M |
M |
M |
M |
precip ended - storm total is this amount 0.48"
No thunder - very disappointing after all of the days of upper 90s and 100s we can't get any decent convection even with the cold front |
| 7/11/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/12/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/13/2010 |
9:30 AM |
0.40 |
M |
M |
M |
M |
Afternoon storms passing S to N mostly to the east and west, not sure how much came from those while I was at work. Late evening storm after dark came by with a short period of heavy rain and a healthy amount of in-cloud lightning. |
| 7/14/2010 |
7:30 AM |
1.30 |
M |
M |
M |
M |
Thunderstorm began between 7:30pm and 8pm with core arriving around 8pm, as light rain fell in front of main storm, then updraft base and gust front and heavy rain came through around 8pm trailed by a moderate amount of sharp multistroke lightning having high multiplicity (many repititions in a single flash). After the storm passed, at dusk, the gently backlit purplish gray sky with lightning flickering in the clouds above the wet green trees was scenic. Another storm with more frequent flashes came through around midnight, having a heavy downpour in front and moderate rain for a while in back and a few intense curly multiforked long strikes with loud rolling and booming thunder as the storm pulled away. These were lower and not as horizontal as classic anvil crawlers but similar in character. Second day in a row with amount ending in "0" (yesterday 0.40). |
| 7/15/2010 |
9:00 AM |
0.11 |
M |
M |
M |
M |
Rain fell in the morning Wednesday (yesterday) but did not begin until after yesterday's measurement. |
| 7/16/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/17/2010 |
1:00 PM |
0.41 |
M |
M |
M |
M |
Thunderstorm came at midnight with somewhat heavy but not torrential downpour. Lightning was frequent, had high multiplicity and a lot of forking in cloud but not as much forking in the ground strike portion. A major lightning center passed to the south with additional activity overhead and a second cell forming at the rear and passing over along a more northerly track almost overhead shortly before 1 am. Most of the rain was with the first but relatively heavier shower activity came with the second while lighter steady rain fell between. |
| 7/18/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/19/2010 |
9:00 AM |
0.31 |
M |
M |
M |
M |
Thunderstorm with extremely frequent lightning came out of the west-southwest at 11pm, lighting up the sides of the tower, and the lightning further intensified after it moved to the northeast, with some curly wiggly bolts in all directions and lots of strobe-like flashing within the cloud, some accompanied by parts of the bolt visible while the beginning and ending parts were obscured by clouds. A second cell without much lightning came shortly before midnight. The wind was somewhat gusty towards the beginning of the storm, after the rain had already become moderately heavy, but no very strong winds (in contrast to BWI which recorded gusts to 63 knots). |
| 7/20/2010 |
9:30 AM |
0.01 |
M |
M |
M |
M |
Dissipating storms skirted the vicinity, apparently dropping a leftover stray little shower. |
| 7/21/2010 |
9:00 AM |
0.00 |
0.0 |
M |
M |
M |
Gauge was dry. Evening area of rain approached from the southwest while dissipating, don't know if there were any sprinkles (trace) or not. |
| 7/22/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/23/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/24/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/25/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/26/2010 |
9:00 AM |
0.54 |
M |
M |
M |
M |
Extreme winds and wind damage but gauge and hailpad not damaged. Wind came before rain, I watched cold (I felt instant temperature change) gust front surging underneath updraft base rip tree pieces off of trees, sheared off trees, uprooted trees, send massive amounts of debris flying through the air. A 10-15 foot section of a tree flew at least 80 feet across my yard and my gazebo was mangled, two ropes snapped off as the anchors held in the ground, some houses had shingles blown off, and one had a branch fly off a snapped-off tree and landed on a vertical trajectory, puncturing their roof. Of course, power lines are down, trees down on powerlines, etc. As far as I am aware, nobody had a roof or roof part lifted off, roof damage was limited to shingles lost and to trees and tree chunks falling onto houses. The extremely strong winds lasted only a few minutes at the most, coming in at least 2 separate surges separated by seconds or a minute. |
| 7/27/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/28/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 7/29/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 8/3/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 8/4/2010 |
9:00 AM |
0.38 |
M |
M |
M |
M |
Overnight thundershower. I did not notice very much lightning and thunder, not sure if there wasn't much or I slept through most of it. |
| 8/5/2010 |
9:30 AM |
0.03 |
M |
M |
M |
M |
Brief shower around 9pm, few seconds of downpour but so brief barely enough to wet streets, then a little light rain, then a few more drops in the morning between 8 and 9 am approximately. Evening storms to the north with distant lightning and a few rumbles of thunder. |
| 8/6/2010 |
9:30 AM |
0.27 |
M |
M |
M |
M |
I was in downtown Silver Spring during the series of storms. I saw the big storm which tracked from Dulles area across Arlington to the southeast part of the Beltway pass to my south with quite a bit of sharp unforked single lightning strikes to ground and more blurry flashes I could barely make out behind the heavy rain area (e.g. further south than my range of good visibility). An updraft base and broken weak roll cloud came out of the southwest along the north flank of the storm's track, after the leading gust front had zipped by to the south, and brought a rainfoot with some brief heavy rain blowing from the south. A second storm with only a little lightning followed later from the west, again with Silver Spring on the north edge, with rain blowing in from the south. A later line of weaker cells passed by to the north and dissipated. |
| 8/7/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 8/8/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 8/9/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 8/10/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 8/11/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 8/12/2010 |
9:30 AM |
2.09 |
M |
M |
M |
M |
Big thunderstorm came between 7:15am and 7:20am with torrential downpours and gusty winds from the east and northeast pushing sheets of water up the hill (house is on slope, east is downhill). Most rain fell in around 25 minutes. Some areas north of the beltway had a heavy shower about an hour earlier than this storm passed through, I don't know if I did or not (my location is slightly south of the beltway). I had two cells with separate concentrations of lightning and peak rainfall around 15 minutes apart. Most of the ground strikes were towards the rear of the cells and the lightning was extremely intense, with numerous very close strikes in all directions. The side walls of the towers and anvil were exposed after the second cell had passed and the line was to my southeast. Certainly a spectacular storm and at an unusual time of day! Also unusual, the 12z sounding from IAD had MLCAPE of 3098 J/kg! |
| 8/13/2010 |
10:00 AM |
0.71 |
M |
M |
M |
M |
Late afternoon storm brought brief downpour and lightning at my obs site (according to others who were present there), then overnight rain fell and light rain began again in the morning. No rain falling at time of observation. Probably only a few hundredths of an inch fell during this morning, giving 24-hour totals of around 2.7 inches including yesterday morning's deluge.
Yesterday afternoon's thunderstorm came out of the NNW from the Mt Airy area and surged with a nose down the Rockville-Bethesda-Potomac corridor. I watched the southward surging shelf cloud nose like the tip of a triangle pass to the west of my Silver Spring office. Unlike the morning storm, this one had most of the lightning ahead of the main storm core as it had a forward overhang. The lightning strikes were jagged and unusually bright and the thunder unusually loud given the distance (several strikes a few miles away were quite loud even inside the office building). I watched he heavy rain core pass just to the west of Silver Spring, buildings and trees becoming obscured by the dark shroud of heavy rain nearby while rain was never particularly heavy at my office and visibility to the southeast never became low. |
| 8/14/2010 |
2:00 PM |
0.02 |
M |
M |
M |
M |
|
| 8/17/2010 |
10:00 AM |
0.01 |
M |
M |
M |
M |
I thought I had no rain but there was a little water in the gauge. There were storms far to the west which dissipated, leaving orphan anvils which moved east across the metro area. From my office, I saw snow falling out of a portion of one of those anvils. I suppose it is possible an area of light rain passed overhead and my gauge was in the lucky spot. Radar did show some weak echoes but at the time I figured they were probably indicating boundary layer turbulence. |
| 8/18/2010 |
11:00 AM |
4.54 |
M |
M |
M |
M |
This is a record since starting my CoCoRaHS observations in 2007. No precip through midnight, all overnight and during the morning. Moderate to almost heavy rain was still falling at 11am obs but became light within 15 minutes afterwards. Basement flooding 2nd worst in 5 years, worst was with rain combined with snowpack rapid meltoff at the end of this winter. I had no such flooding with the late June 2006 deluges.
No lightning or thunder with this event. |
| 8/19/2010 |
8:40 AM |
0.06 |
M |
M |
M |
M |
Storm total 4.60. All standing water has run off, no flooding now and no puddles. Grass is still very wet. |
| 8/20/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 8/21/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 8/22/2010 |
11:00 AM |
0.07 |
M |
M |
M |
M |
No lightning or thunder |
| 8/23/2010 |
8:30 AM |
T |
M |
M |
M |
M |
A line of thunderstorms was developing as it passed overhead and finally produced showers and lightning and thunder a bit too my southeast. I heard thunder as it was around 10 miles or so to my southeast. |
| 8/24/2010 |
9:10 AM |
0.00 |
0.0 |
M |
M |
M |
Everything dry still, no indications of drizzle yet. |
| 8/25/2010 |
9:30 AM |
T |
M |
M |
M |
M |
Gauge was dry but I observed very light drizzle with a few raindrops in the evening around 9pm. |
| 8/26/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 8/27/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 8/28/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 8/29/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 8/30/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 8/31/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/1/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/2/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/3/2010 |
10:00 AM |
0.00 |
0.0 |
M |
M |
M |
Gauge was completely dry and not a drop found anywhere. Radar showed the outermost band associated with Earl was not far to my east, even within the county. |
| 9/4/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/5/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/6/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/7/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/8/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/9/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/10/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/11/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/12/2010 |
11:45 AM |
0.59 |
M |
M |
M |
M |
includes overnight rain and morning rain. Rain ended before obs time but still mist with fine light drizzle and trees are still dripping. |
| 9/13/2010 |
10:00 AM |
0.04 |
M |
M |
M |
M |
Storm total 0.63". Light rain and drizzle continued through much of the day at my home observing site while I was in sunny, warm western Charles county.
|
| 9/14/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/15/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/16/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/17/2010 |
9:30 AM |
0.08 |
M |
M |
M |
M |
Did not see lightning or hear thunder. |
| 9/18/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/19/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/20/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/21/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/22/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/23/2010 |
8:45 AM |
0.09 |
M |
M |
M |
M |
Electrically very active small multicell cluster passed mostly just north and east of this location on its southeastward track around 7:30-8pm. I watched the storm from my office in downtown Silver Spring and observed power flashes in the distant northwest, approximately in the north Kensington to just-west-of-Wheaton vicinity, although I have no good gauge on distance - definitely at least 1-2 miles away and definitely closer than Rockville. The power flashes occured when most of the lightning was further to the east than where the power flashes occured. Outflow winds in downtown Silver Spring were probably around or under 40 MPH with dust blowing from the construction site next to the Metro station, although it was enough to set the tall crane rocking and tilting and to blow an orange traffic cone off the Metro platform onto the tracks. Earlier in the day, I had a nice view of the anvil and part of the tower of the strong storm in the Leesburg vicinity and the portions that remained as it tracked east. A weakening cell even brought a few raindrops to Silver Spring falling from the anvil as the main rain shaft was west of Bethesda around 5pm. The storm dissipated completely as the rain fell out there. |
| 9/24/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/25/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/26/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/27/2010 |
9:00 AM |
0.30 |
M |
M |
M |
M |
Light rain fell Sunday morning. Most of the rain fell Sunday night into this morning. No rain was falling at the time of observation. |
| 9/28/2010 |
8:15 AM |
0.14 |
M |
M |
M |
M |
|
| 9/29/2010 |
7:00 AM |
0.00 |
0.0 |
M |
M |
M |
|
| 9/30/2010 |
9:30 AM |
2.15 |
M |
M |
M |
M |
Only light rain at time of obs. Intermittent moderate and heavy rain through the night. No lightning or thunder observed and no strong winds either. Basement is dry! Hopefully it will stay that way. |