Station Overview Station Location
Station Number MT-RV-7 Latitude 46.320898
Station Name Corvallis 4.2 ENE Longitude -114.025166
County Ravalli Elevation (ft) 4282



Month 30 Yr Avg by PRISM Total Prcp Sum Days Covered By All Observations Daily Prcp Sum Daily Observation Count Multiday Prcp Sum Days Covered by Multiday Observations Multiday Observation Count Days With Prcp Days With Trace Total Snowfall Days With Snowfall Days With Snow On Ground
Oct 10 0.85 1.44 30 1.44 28 0.00 2 1 8 3 0.0 0 0
Nov 10 0.96 1.00 30 1.00 30 0.00 0 0 11 13 7.9 6 11
Dec 10 0.84 1.51 31 1.51 31 0.00 0 0 14 7 11.1 10 29
Jan 11 0.95 0.83 31 0.83 31 0.00 0 0 11 13 7.6 5 22
Feb 11 0.81 1.44 28 1.44 28 0.00 0 0 13 7 17.1 12 21
March 11 1.15 0.82 31 0.82 31 0.00 0 0 16 7 3.4 10 10
April 11 1.42 0.64 30 0.63 27 0.01 3 1 13 11 0.6 4 0
May 11 2.02 3.23 31 3.23 30 0.00 1 1 13 8 0.2 1 1
June 11 2.28 2.16 30 2.16 30 0.00 0 0 16 5 0.0 0 0
July 11 1.17 1.06 31 0.97 29 0.09 2 1 5 5 0.0 0 0
Aug 11 1.12 0.27 31 0.27 31 0.00 0 0 5 5 0.0 0 0
Sept 11 1.12 0.51 30 0.51 30 0.00 0 0 5 3 0.0 0 0
Water Year Totals: 14.69" 14.91" 364 days 14.81" 356 0.10" 8 days 4 130 days 87 days 47.9" 48 days 94 days



Days in Water Year Cell Color Key
        Daily Observation with Prcp         Missing Day
        Multiday Observation         Daily/Multiday Observation Conflict

Day of Year Daily Prcp Multiday Prcp
10/1/2010 **
10/2/2010 0.00
10/3/2010 0.00
10/4/2010 T
10/5/2010 0.57
10/6/2010 0.00
10/7/2010 0.00
10/8/2010 0.01
10/9/2010 0.01
10/10/2010 0.00
10/11/2010 0.56
10/12/2010 T
10/13/2010 0.00
10/14/2010 0.00
10/15/2010 0.00
10/16/2010 0.00
10/17/2010 0.00
10/18/2010 0.00
10/19/2010 0.00
10/20/2010 0.00
10/21/2010
10/22/2010 0.00
10/23/2010 0.00
10/24/2010 0.03
10/25/2010 0.24
10/26/2010 0.01
10/27/2010 T
10/28/2010 0.00
10/29/2010 0.00
10/30/2010 0.01
10/31/2010 0.00
11/1/2010 0.01
11/2/2010 0.00
11/3/2010 T
11/4/2010 0.00
11/5/2010 0.00
11/6/2010 0.00
11/7/2010 0.01
11/8/2010 0.16
11/9/2010 T
11/10/2010 T
11/11/2010 T
11/12/2010 T
11/13/2010 T
11/14/2010 T
11/15/2010 T
11/16/2010 0.14
11/17/2010 0.05
11/18/2010 T
11/19/2010 0.01
11/20/2010 0.04
11/21/2010 0.16
11/22/2010 T
11/23/2010 0.32
11/24/2010 0.04
11/25/2010 T
11/26/2010 T
11/27/2010 0.00
11/28/2010 0.06
11/29/2010 T
11/30/2010 0.00
12/1/2010 T
12/2/2010 0.01
12/3/2010 0.18
12/4/2010 T
12/5/2010 0.00
12/6/2010 0.00
12/7/2010 T
12/8/2010 0.00
12/9/2010 0.18
12/10/2010 0.04
12/11/2010 0.01
12/12/2010 0.18
12/13/2010 0.04
12/14/2010 0.13
12/15/2010 0.20
12/16/2010 T
12/17/2010 0.00
12/18/2010 0.00
12/19/2010 0.18
12/20/2010 0.23
12/21/2010 T
12/22/2010 0.00
12/23/2010 0.00
12/24/2010 T
12/25/2010 0.00
12/26/2010 0.00
12/27/2010 0.04
12/28/2010 T
12/29/2010 0.00
12/30/2010 0.06
12/31/2010 0.03
Day of YearDaily PrcpMultiday Prcp
1/1/2011 T
1/2/2011 0.00
1/3/2011 T
1/4/2011 0.00
1/5/2011 T
1/6/2011 0.00
1/7/2011 T
1/8/2011 0.01
1/9/2011 0.01
1/10/2011 0.19
1/11/2011 T
1/12/2011 T
1/13/2011 0.03
1/14/2011 T
1/15/2011 T
1/16/2011 0.01
1/17/2011 0.22
1/18/2011 0.06
1/19/2011 0.11
1/20/2011 0.00
1/21/2011 T
1/22/2011 0.08
1/23/2011 T
1/24/2011 T
1/25/2011 0.05
1/26/2011 0.00
1/27/2011 0.00
1/28/2011 0.00
1/29/2011 T
1/30/2011 T
1/31/2011 0.06
2/1/2011 0.01
2/2/2011 0.00
2/3/2011 0.00
2/4/2011 0.00
2/5/2011 0.22
2/6/2011 0.00
2/7/2011 0.07
2/8/2011 0.21
2/9/2011 0.05
2/10/2011 T
2/11/2011 0.00
2/12/2011 0.00
2/13/2011 0.01
2/14/2011 T
2/15/2011 T
2/16/2011 T
2/17/2011 0.35
2/18/2011 0.02
2/19/2011 T
2/20/2011 0.31
2/21/2011 0.01
2/22/2011 T
2/23/2011 0.01
2/24/2011 0.05
2/25/2011 0.12
2/26/2011 0.00
2/27/2011 0.00
2/28/2011 T
3/1/2011 0.01
3/2/2011 0.00
3/3/2011 0.01
3/4/2011 0.02
3/5/2011 T
3/6/2011 T
3/7/2011 0.02
3/8/2011 0.07
3/9/2011 0.03
3/10/2011 0.00
3/11/2011 0.06
3/12/2011 0.00
3/13/2011 0.00
3/14/2011 0.01
3/15/2011 T
3/16/2011 0.23
3/17/2011 T
3/18/2011 T
3/19/2011 0.00
3/20/2011 0.06
3/21/2011 0.00
3/22/2011 0.21
3/23/2011 0.00
3/24/2011 0.00
3/25/2011 0.03
3/26/2011 0.01
3/27/2011 T
3/28/2011 0.03
3/29/2011 0.01
3/30/2011 T
3/31/2011 0.01
Day of YearDaily PrcpMultiday Prcp
4/1/2011 0.01
4/2/2011 0.10
4/3/2011 0.18
4/4/2011 0.02
4/5/2011 0.04
4/6/2011 T
4/7/2011 0.01
4/8/2011 T
4/9/2011 0.02
4/10/2011 T
4/11/2011 0.00
4/12/2011 **
4/13/2011 0.01
4/14/2011 0.03
4/15/2011 0.00
4/16/2011 T
4/17/2011 0.02
4/18/2011 T
4/19/2011 T
4/20/2011 0.01
4/21/2011 T
4/22/2011 0.11
4/23/2011 T
4/24/2011 0.00
4/25/2011 T
4/26/2011 0.02
4/27/2011 T
4/28/2011 0.06
4/29/2011 T
4/30/2011 **
5/1/2011 T
5/2/2011 T
5/3/2011 T
5/4/2011 T
5/5/2011 0.00
5/6/2011 T
5/7/2011 0.07
5/8/2011 0.00
5/9/2011 1.10
5/10/2011 0.34
5/11/2011 0.00
5/12/2011 0.00
5/13/2011 T
5/14/2011 0.01
5/15/2011 0.00
5/16/2011 0.26
5/17/2011 0.00
5/18/2011 0.00
5/19/2011 0.01
5/20/2011 T
5/21/2011 T
5/22/2011 0.00
5/23/2011 0.07
5/24/2011 0.74
5/25/2011 0.34
5/26/2011 0.21
5/27/2011 0.01
5/28/2011 0.03
5/29/2011 0.00
5/30/2011 T
5/31/2011 0.04
6/1/2011 0.01
6/2/2011 0.43
6/3/2011 0.27
6/4/2011 T
6/5/2011 0.00
6/6/2011 0.04
6/7/2011 0.04
6/8/2011 0.38
6/9/2011 0.02
6/10/2011 0.08
6/11/2011 0.00
6/12/2011 0.15
6/13/2011 T
6/14/2011 0.06
6/15/2011 T
6/16/2011 T
6/17/2011 0.02
6/18/2011 T
6/19/2011 0.04
6/20/2011 0.01
6/21/2011 0.00
6/22/2011 0.00
6/23/2011 0.04
6/24/2011 0.17
6/25/2011 0.00
6/26/2011 0.00
6/27/2011 0.00
6/28/2011 0.00
6/29/2011 0.00
6/30/2011 0.40
Day of YearDaily PrcpMultiday Prcp
7/1/2011 0.00
7/2/2011 0.00
7/3/2011 0.00
7/4/2011 0.00
7/5/2011 0.00
7/6/2011 0.00
7/7/2011 0.00
7/8/2011 0.01
7/9/2011 0.00
7/10/2011 0.00
7/11/2011 0.00
7/12/2011 0.00
7/13/2011 0.22
7/14/2011 0.57
7/15/2011 T
7/16/2011 T
7/17/2011 0.05
7/18/2011 0.00
7/19/2011 0.00
7/20/2011 0.12
7/21/2011 0.00
7/22/2011 **
7/23/2011 0.09
7/24/2011 0.00
7/25/2011 T
7/26/2011 T
7/27/2011 0.00
7/28/2011 0.00
7/29/2011 0.00
7/30/2011 0.00
7/31/2011 T
8/1/2011 0.07
8/2/2011 0.04
8/3/2011 0.00
8/4/2011 0.00
8/5/2011 T
8/6/2011 T
8/7/2011 0.00
8/8/2011 0.00
8/9/2011 0.00
8/10/2011 0.00
8/11/2011 0.03
8/12/2011 0.00
8/13/2011 0.00
8/14/2011 T
8/15/2011 0.00
8/16/2011 0.00
8/17/2011 0.00
8/18/2011 0.00
8/19/2011 0.00
8/20/2011 0.00
8/21/2011 0.00
8/22/2011 0.00
8/23/2011 0.00
8/24/2011 0.00
8/25/2011 T
8/26/2011 0.00
8/27/2011 0.00
8/28/2011 0.00
8/29/2011 0.11
8/30/2011 0.02
8/31/2011 T
9/1/2011 0.08
9/2/2011 T
9/3/2011 0.00
9/4/2011 0.00
9/5/2011 0.00
9/6/2011 0.00
9/7/2011 0.00
9/8/2011 0.00
9/9/2011 0.00
9/10/2011 T
9/11/2011 0.00
9/12/2011 0.00
9/13/2011 0.00
9/14/2011 0.00
9/15/2011 0.00
9/16/2011 0.33
9/17/2011 0.00
9/18/2011 T
9/19/2011 0.02
9/20/2011 0.03
9/21/2011 0.00
9/22/2011 0.00
9/23/2011 0.00
9/24/2011 0.00
9/25/2011 0.00
9/26/2011 0.05
9/27/2011 0.00
9/28/2011 0.00
9/29/2011 0.00
9/30/2011 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/3/2010 8:00 AM 0.00 0.0 M M M
10/4/2010 8:00 AM T M M M M
10/5/2010 7:40 AM 0.57 M M M M After 12 days of no measurable rain, the .57" was beneficial.
10/6/2010 8:00 AM 0.00 0.0 M M M
10/7/2010 8:00 AM 0.00 0.0 M M M
10/8/2010 8:00 AM 0.01 M M M M
10/9/2010 8:00 AM 0.01 M M M M
10/10/2010 8:00 AM 0.00 0.0 M M M
10/11/2010 8:00 AM 0.56 M M M M Moderate to heavy rain fell between 1:00-2:00 am, with wind shift observed at 1:40 am. Month-to-date total precip now 1.15".
10/12/2010 8:00 AM T M M M M
10/13/2010 8:00 AM 0.00 0.0 M M M
10/14/2010 8:00 AM 0.00 0.0 M M M
10/15/2010 8:00 AM 0.00 0.0 M M M
10/16/2010 8:00 AM 0.00 0.0 M M M
10/17/2010 8:00 AM 0.00 0.0 M M M
10/18/2010 8:00 AM 0.00 0.0 M M M
10/19/2010 8:00 AM 0.00 0.0 M M M
10/20/2010 8:00 AM 0.00 0.0 M M M
10/22/2010 8:00 AM 0.00 0.0 M M M
10/23/2010 8:00 AM 0.00 0.0 M M M
10/24/2010 9:00 AM 0.03 M M M M
10/25/2010 8:30 AM 0.24 T M 0.0 M Light snow shower and 34 degrees at obv time, with light accumulations above 5,000 ft.
10/26/2010 8:00 AM 0.01 T M T M
10/27/2010 8:00 AM T T M 0.0 M
10/28/2010 7:00 AM 0.00 0.0 M M M
10/29/2010 8:00 AM 0.00 0.0 M M M
10/30/2010 8:00 AM 0.01 M M M M
10/31/2010 8:00 AM 0.00 0.0 M M M
11/1/2010 8:00 AM 0.01 M M M M
11/2/2010 8:00 AM 0.00 0.0 M M M
11/3/2010 8:00 AM T M M M M
11/4/2010 7:00 AM 0.00 0.0 M M M
11/5/2010 8:00 AM 0.00 0.0 M M M
11/6/2010 8:00 AM 0.00 0.0 M M M
11/7/2010 8:00 AM 0.01 M M M M
11/8/2010 8:00 AM 0.16 T M T M Currently: Sn shwrs, and temp of 32. Remember, to avoid cracks, be winter-wise and bring your inner-tube and top inside!
11/9/2010 8:00 AM T T M 0.0 M
11/10/2010 8:00 AM T T M 0.0 M Light flurry activity at obv time.
11/11/2010 8:00 AM T T M 0.0 M
11/12/2010 8:00 AM T T M 0.0 M Light flurry activity with broken overcast.
11/13/2010 8:00 AM T T M 0.0 M
11/14/2010 8:00 AM T T M 0.0 M
11/15/2010 7:00 AM T 0.0 M 0.0 M
11/16/2010 8:00 AM 0.14 T M T M Currently light snow and temp of 33.
11/17/2010 8:00 AM 0.05 T M 0.0 M
11/18/2010 7:00 AM T 0.0 M 0.0 M Strong sw winds continue at this mid-level location, with gusts of 35+.
11/19/2010 8:00 AM 0.01 0.2 M T M
11/20/2010 8:00 AM 0.04 0.5 M 0.5 M Reported snow is from yesterday afternoon. Accumulating snow has resumed this morning. Currently: lt/mod. snow, fog, and a light wind.
11/21/2010 8:00 AM 0.16 2.5 M 3.0 M Light flurry activity at obv time, with a temp of +8, after an overnight low of +5.
11/22/2010 8:00 AM T T M 3.0 M
11/23/2010 8:00 AM 0.32 3.6 M 5.5 M Brief white-out/heavy snow conditions at 5:30 a.m., but light wind and light snow since then. Temp has fallen to current reading of +1.
11/24/2010 8:00 AM 0.04 0.4 M 5.5 M Overnight low of minus 8. Interesting to note the .76" liquid (mainly SWE) precip since Nov 16.
11/25/2010 8:00 AM T T M 5.0 M Flurries and 14 above at obv time, after an overnight low of minus 2.
11/26/2010 8:00 AM T T M 4.5 M
11/27/2010 8:00 AM 0.00 0.0 M 4.0 M
11/28/2010 9:00 AM 0.06 0.7 M 4.0 M
11/29/2010 8:00 AM T T M 4.0 M
11/30/2010 8:00 AM 0.00 0.0 M 3.5 M November liquid precip came in a bit above normal at exactly 1.00", including 7.9" of snow.
12/1/2010 8:20 AM T T M 3.0 M Light flurry at obv time.
12/2/2010 8:30 AM 0.01 T M 2.5 M Light snow/freezing rain showers have produced a light ice glaze (significant weather report submitted). Currently, overcast and 31.
12/3/2010 8:00 AM 0.18 1.3 M 3.0 M Precip fell at first as sn/frz rn/rn mix, and then all snow after 6 pm.
12/4/2010 8:00 AM T T M 3.0 M
12/5/2010 8:00 AM 0.00 0.0 M 3.0 M Stratus layer at 5-6k providing first significant inversion of the season for the Bitterroot Valley.
12/6/2010 8:00 AM 0.00 0.0 M 3.0 M Inversion conditions continue, with frz fog and a vis of <.5 mi.
12/7/2010 8:00 AM T T M 3.0 M A passing light flurry yesterday afternoon. With breaks in the overcast this morning, inversion is finally showing signs of weakening.
12/8/2010 8:00 AM 0.00 0.0 M 3.0 M
12/9/2010 8:00 AM 0.18 0.6 M 2.5 M Yesterday's inversion temp profile resulted in a 20 degree variance over just 700' of elevation, with the valley floor at 22 receiving light frz rn, and this mid-level location at 42 getting just rain, which turned over to light sn overnight.
12/10/2010 8:00 AM 0.04 T M 2.0 M
12/11/2010 8:00 AM 0.01 0.1 M 2.0 M Repeated thawing and freezing with additional precip over the last several days have resulted in ice-covered secondary roads above 4,000 feet.
12/12/2010 8:00 AM 0.18 1.3 M 2.0 M
12/13/2010 9:00 AM 0.04 0.0 M T M
12/14/2010 8:00 AM 0.13 0.0 M T M
12/15/2010 7:00 AM 0.20 0.5 M 0.5 M Frozen slush with light coating of snow making for slick conditions. The .20 SWE is exact.
12/16/2010 8:00 AM T T M 0.5 M
12/17/2010 8:00 AM 0.00 0.0 M 0.5 M
12/18/2010 8:00 AM 0.00 0.0 M 0.5 M
12/19/2010 7:40 AM 0.18 2.7 M 3.0 M Steady lt/mod snow yesterday from 11 am to 4 pm, with snow showers through 1 am.
12/20/2010 8:00 AM 0.23 2.6 M 5.0 M Two-day storm total of 5.3". Lingering flurries currently.
12/21/2010 8:00 AM T T M 4.5 M
12/22/2010 8:00 AM 0.00 0.0 M 4.5 M
12/23/2010 8:00 AM 0.00 0.0 M 4.0 M
12/24/2010 8:00 AM T T M 4.0 M Trace from brief graupel shower yesterday morning.
12/25/2010 8:00 AM 0.00 0.0 M 3.5 M
12/26/2010 8:00 AM 0.00 0.0 M 3.5 M Inversion layer resulted in a 3 pm temp of 19 in Hamilton, and 39 here, just 700' above, a 20-degree variance.
12/27/2010 8:00 AM 0.04 0.6 M 4.0 M
12/28/2010 8:00 AM T T M 3.0 M Downsloping conditions persisting this morning, with only isolated flurries making it over the Bitterroot ridge.
12/29/2010 8:00 AM 0.00 0.0 M 2.5 M
12/30/2010 8:00 AM 0.06 0.8 M 3.5 M
12/31/2010 7:59 AM 0.03 0.6 M 4.0 M An overnight low of minus five.
1/1/2011 8:00 AM T T M 4.0 M Dec precip was 1.51" liquid, vs. 1.15" avg. This included 11.1" snow.
1/2/2011 7:50 AM 0.00 0.0 M 3.5 M Total liquid precip for 2010 was 13.82", which is exactly the 30-yr average of 13.82" for nearby Missoula. The 2010 total included 35.0 inches of snow.
1/3/2011 8:00 AM T T M 3.5 M
1/4/2011 7:00 AM 0.00 0.0 M 3.0 M
1/5/2011 8:00 AM T T M 3.0 M
1/6/2011 8:00 AM 0.00 0.0 M 2.5 M
1/7/2011 8:00 AM T 0.0 M 1.0 M Yesterday's high of 43 melted a good part of the snowpack, with patches of bare ground visible. Currently: 35 with sprinkles of rain.
1/8/2011 8:00 AM 0.01 T M 0.5 M Measurable precip is from yesterday's rain showers; this morning's fropa produced a light trace of snow.
1/9/2011 8:00 AM 0.01 0.2 M 0.5 M
1/10/2011 8:00 AM 0.19 2.5 M 3.0 M New snow depth is estimate due to last night's strong winds. Currently: light snow w/ broken overcast, calm wind, and a temp of 7.
1/11/2011 8:00 AM T T M 3.0 M
1/12/2011 8:00 AM T T M 3.0 M Light snow started within past hour (3-4 mile vis), with current temp of 20 (after a low of 5), and a light south wind.
1/13/2011 8:00 AM 0.03 T M 1.5 M
1/14/2011 8:00 AM T 0.0 M 1.0 M As sagas go, this one is soggy.
1/15/2011 8:00 AM T 0.0 M 0.5 M
1/16/2011 9:00 AM 0.01 0.0 M 0.5 M
1/17/2011 8:00 AM 0.22 0.0 M T M
1/18/2011 7:50 AM 0.06 T M T M Mixed rn/sn showers overnight, with residual moisture having frozen into patchy ice (even on ground & hard surfaces). Currently, 32 and cloudy, calm wind.
1/19/2011 7:50 AM 0.11 2.5 M 2.5 M A very dry snow, with lingering flurries and breaks in the overcast.
1/20/2011 8:00 AM 0.00 0.0 M 1.5 M
1/21/2011 8:00 AM T T M 1.0 M
1/22/2011 8:30 AM 0.08 0.6 M 1.0 M Accumulating snow came in two bursts: one at midnight (as rain turned over to snow), and the other just before obv time (8:15 to 8:30 am).
1/23/2011 8:00 AM T T M 0.5 M Precip from yesterday's lingering snow showers.
1/24/2011 8:00 AM T T M T M
1/25/2011 8:00 AM 0.05 T M T M Snow/rain mix last night, with patchy ice this morning.
1/26/2011 8:00 AM 0.00 0.0 M T M
1/27/2011 7:50 AM 0.00 0.0 M T M
1/28/2011 8:00 AM 0.00 0.0 M 0.0 M Yesterday's high made it up to 54, 21 degrees above normal.
1/29/2011 8:00 AM T 0.0 M 0.0 M
1/30/2011 8:00 AM T T M 0.0 M This Bitterroot location remains on the mild side of the front, with a temp of 34, SE winds, and a falling BP. Trace precip was from yesterday morning.
1/31/2011 8:00 AM 0.06 1.8 M 2.0 M Light snow persisted through the night, adding another inch. Currently: lingering lt sn/fog, 6 mi vis, calm wind, +8 F, with breaks in the overcast.
2/1/2011 8:00 AM 0.01 0.2 M 2.0 M Overnight low of minus five, with precip reported from yesterday's lingering snow showers.
2/2/2011 8:00 AM 0.00 0.0 M 1.5 M
2/3/2011 8:00 AM 0.00 0.0 M 1.0 M
2/4/2011 8:00 AM 0.00 0.0 M T M
2/5/2011 8:00 AM 0.22 0.1 M T M Precip is from yesterday's rain showers and late night snow showers.
2/6/2011 8:00 AM 0.00 0.0 M 0.0 M
2/7/2011 8:00 AM 0.07 1.2 M 1.0 M Periodic bands of mod/heavy snow continuing. Currently: heavy snow/fog, vis < 1/4 mi, light south wind.
2/8/2011 7:50 AM 0.21 4.8 M 4.5 M Two-day storm total of 6.0", with some melting resulting from yesterday's high of 39. Currently: steady light snow/fog, vis. < 1 mile, calm wind, and a temp of 13.
2/9/2011 7:50 AM 0.05 0.5 M 4.0 M Measurable precip is from yesterday, though light non-accumulating snow showers observed this morning.
2/10/2011 7:50 AM T T M 3.5 M
2/11/2011 8:00 AM 0.00 0.0 M 2.5 M
2/12/2011 8:00 AM 0.00 0.0 M 1.5 M
2/13/2011 8:30 AM 0.01 T M T M Post-fropa showers and partial clearing allowed the pre-dawn temp to drop to 30, resulting in patchy ice on raised surfaces and a trace of graupel. Current temp now back up to 33.
2/14/2011 8:00 AM T T M 0.0 M Trace of graupel is from yesterday morning.
2/15/2011 8:00 AM T 0.0 M 0.0 M
2/16/2011 7:30 AM T T M T M Precip started at 7 a.m. as light rain and quickly turned over to snow. Currently: moderate snow/fog, vis. < .25 mile, calm wind, and a temp of 31.
2/17/2011 8:00 AM 0.35 4.0 M 3.5 M Snow depth is an estimate based on multiple measurements.
2/18/2011 7:40 AM 0.02 0.3 M 3.0 M Precip is from yesterday morning and overnight.
2/19/2011 8:00 AM T T M 2.0 M
2/20/2011 7:55 AM 0.31 3.5 M 5.0 M
2/21/2011 8:00 AM 0.01 0.3 M 4.5 M
2/22/2011 8:00 AM T T M 4.0 M
2/23/2011 7:30 AM 0.01 0.3 M 3.5 M
2/24/2011 7:55 AM 0.05 0.8 M 4.0 M Light to moderate snow continues, vis. of .5 mile, light north wind, temp of +4, and a rising BP.
2/25/2011 7:50 AM 0.12 1.1 M 5.0 M An overnight low of minus 7, with lingering light snow. Currently, partly cloudy and hazy, with a temp of minus 6.
2/26/2011 8:00 AM 0.00 0.0 M 4.5 M An overnight low of minus 7. Interesting to note that precip has been observed 19 of the 26 days thus far this month.
2/27/2011 8:00 AM 0.00 0.0 M 4.0 M
2/28/2011 8:30 AM T T M 3.5 M Strong downsloping, though light flurry activity has developed in the last 30 minutes, with a current temp of 30.
3/1/2011 8:00 AM 0.01 0.1 M 3.0 M
3/2/2011 7:30 AM 0.00 0.0 M 2.5 M Total Feb precip of 1.44" was nearly double the .77" norm. This included 17.1" of snow.
3/3/2011 8:00 AM 0.01 0.1 M 1.5 M
3/4/2011 7:50 AM 0.02 0.2 M 1.0 M
3/5/2011 8:00 AM T T M 0.5 M
3/6/2011 8:00 AM T T M 0.5 M
3/7/2011 8:30 AM 0.02 0.5 M 0.5 M Light to moderate snow began at 7:00 a.m. and continues. Currently: mod. snow/fog, .5" accumulation, temp of 28, calm wind, and a vis. of .5 mile.
3/8/2011 8:00 AM 0.07 1.0 M 0.5 M
3/9/2011 8:00 AM 0.03 0.5 M 0.5 M A fast but furious snow shower moved through at 7 p.m., laying down a quick half inch.
3/10/2011 8:00 AM 0.00 0.0 M T M
3/11/2011 8:00 AM 0.06 T M T M
3/12/2011 8:00 AM 0.00 0.0 M T M
3/13/2011 8:00 AM 0.00 0.0 M 0.0 M
3/14/2011 8:00 AM 0.01 T M T M
3/15/2011 8:00 AM T T M 0.0 M
3/16/2011 8:00 AM 0.23 T M 0.0 M
3/17/2011 8:00 AM T T M T M
3/18/2011 8:00 AM T T M 0.0 M
3/19/2011 8:00 AM 0.00 0.0 M 0.0 M
3/20/2011 8:00 AM 0.06 0.2 M 0.0 M Snow accumulated Saturday between 11:30 am and 1:30 pm, and melted shortly thereafter.
3/21/2011 8:00 AM 0.00 0.0 M 0.0 M
3/22/2011 8:00 AM 0.21 0.4 M 0.5 M
3/23/2011 8:00 AM 0.00 0.0 M 0.0 M
3/24/2011 8:00 AM 0.00 0.0 M 0.0 M
3/25/2011 8:00 AM 0.03 0.0 M 0.0 M
3/26/2011 8:00 AM 0.01 0.1 M 0.0 M
3/27/2011 8:20 AM T T M T M Moderate snow shower began at 8 a.m. and continues at obv time, with a current temp of 30.
3/28/2011 7:00 AM 0.03 0.3 M 0.0 M
3/29/2011 8:00 AM 0.01 T M 0.0 M
3/30/2011 8:00 AM T 0.0 M 0.0 M
3/31/2011 8:00 AM 0.01 0.0 M 0.0 M Strong mixing winds resulted in passing sprinkles and mild temps, with a high yesterday of 59 and a low this morning of 44.
4/1/2011 8:00 AM 0.01 0.0 M 0.0 M
4/2/2011 8:15 AM 0.10 0.0 M 0.0 M Rain total of .10" is exact.
4/3/2011 8:00 AM 0.18 T M 0.0 M
4/4/2011 7:30 AM 0.02 0.2 M 0.0 M
4/5/2011 8:00 AM 0.04 0.0 M 0.0 M
4/6/2011 8:00 AM T T M 0.0 M
4/7/2011 8:00 AM 0.01 0.1 M T M
4/8/2011 8:00 AM T T M T M Wind-driven but mainly light snow developed over the past hour and continues at obv time, with a current temp of 27.
4/9/2011 8:00 AM 0.02 0.2 M T M Steady light snow fell yesterday from 7:30 am to 3 pm, with a passing snow shower at daybreak this morning. Ah, springtime in the Rockies!
4/10/2011 8:00 AM T T M 0.0 M
4/11/2011 8:00 AM 0.00 0.0 M 0.0 M
4/14/2011 8:00 AM 0.03 0.0 M 0.0 M
4/15/2011 8:00 AM 0.00 0.0 M 0.0 M
4/16/2011 8:00 AM T 0.0 M 0.0 M
4/17/2011 8:00 AM 0.02 0.0 M 0.0 M
4/18/2011 8:00 AM T T M 0.0 M
4/19/2011 8:00 AM T T M 0.0 M
4/20/2011 8:00 AM 0.01 0.1 M 0.0 M
4/21/2011 7:00 AM T T M T M Wet snow began at 7 am, with a current temp of 34.
4/22/2011 8:00 AM 0.11 T M 0.0 M
4/23/2011 8:00 AM T T M 0.0 M
4/24/2011 8:00 AM 0.00 0.0 M 0.0 M
4/25/2011 7:00 AM T 0.0 M 0.0 M
4/26/2011 8:00 AM 0.02 T M 0.0 M Passing showers of rain, ice pellets, and snow.
4/27/2011 8:00 AM T T M 0.0 M
4/28/2011 7:50 AM 0.06 T M T M Rain showers transitioned over to snow at 7 am, with light snow continuing, a current temp of 32, and a rising BP.
4/29/2011 8:00 AM T T M 0.0 M
5/2/2011 6:30 AM T T M 0.0 M
5/3/2011 7:00 AM T M M M M
5/4/2011 6:00 AM T T M 0.0 M
5/5/2011 7:00 AM 0.00 0.0 M 0.0 M
5/6/2011 7:00 AM T 0.0 M 0.0 M
5/7/2011 8:00 AM 0.07 0.0 M 0.0 M
5/8/2011 7:00 AM 0.00 0.0 M 0.0 M
5/9/2011 8:00 AM 1.10 0.2 M 0.1 M 1.10" liquid is exact amount, including 0.2" snow. Currently, light snow/rain mix, fog (1 mi. vis), and a temp of 33 (after a low of 31).
5/10/2011 6:00 AM 0.34 T M 0.0 M Two-day storm total of 1.44" liquid, including 0.2" snow.
5/11/2011 8:00 AM 0.00 0.0 M 0.0 M
5/12/2011 6:30 AM 0.00 0.0 M 0.0 M
5/13/2011 6:00 AM T 0.0 M 0.0 M
5/14/2011 6:00 AM 0.01 0.0 M 0.0 M A light t-storm just after 7 pm.
5/15/2011 6:30 AM 0.00 0.0 M M M
5/16/2011 7:30 AM 0.26 0.0 M T M Precip includes a brief but intense period of hail just after 7 a.m. this morning (hail report filed).
5/17/2011 7:00 AM 0.00 0.0 M 0.0 M
5/18/2011 8:00 AM 0.00 0.0 M M M
5/19/2011 7:00 AM 0.01 0.0 M 0.0 M
5/20/2011 7:00 AM T M M M M
5/21/2011 7:00 AM T 0.0 M 0.0 M
5/22/2011 7:00 AM 0.00 0.0 M M M
5/23/2011 7:00 AM 0.07 M M M M
5/24/2011 6:50 AM 0.74 0.0 M 0.0 M The .74" of rain that has fallen overnight into this morning is adding runoff to an already swollen Bitterroot watershed.
5/25/2011 6:50 AM 0.34 M M M M Two-day rain total of 1.08" has saturated the ground.
5/26/2011 7:00 AM 0.21 0.0 M 0.0 M Overnight precip of .21" brings the May total thus far to 3.15", twice the normal month to date average of 1.55".
5/27/2011 6:50 AM 0.01 T M 0.0 M
5/28/2011 7:00 AM 0.03 0.0 M 0.0 M
5/29/2011 8:00 AM 0.00 0.0 M M M
5/30/2011 8:00 AM T M M M M
5/31/2011 7:00 AM 0.04 0.0 M M M
6/1/2011 6:30 AM 0.01 0.0 M M M May total precip came in well above normal at 3.23" vs. the 1.95" average.
6/2/2011 7:00 AM 0.43 0.0 M M M Rain ponding and runoff observed, with moderate rain continuing.
6/3/2011 7:00 AM 0.27 0.0 M M M Two-day storm total of .70" rain.
6/4/2011 6:00 AM T 0.0 M M M
6/5/2011 6:00 AM 0.00 0.0 M M M
6/6/2011 7:00 AM 0.04 0.0 M M M A t-storm rumbled through just after midnight.
6/7/2011 6:30 AM 0.04 M M M M
6/8/2011 7:00 AM 0.38 M M M M Most of the .38" observed fell as heavy to moderate rain between 6 am and 7 am this morning.
6/9/2011 8:00 AM 0.02 M M M M
6/10/2011 7:00 AM 0.08 M M M M
6/11/2011 7:00 AM 0.00 0.0 M M M
6/12/2011 8:00 AM 0.15 M M M M
6/13/2011 6:00 AM T M M M M
6/14/2011 7:00 AM 0.06 M M M M
6/15/2011 7:00 AM T M M M M
6/16/2011 7:00 AM T M M M M
6/17/2011 7:00 AM 0.02 M M M M
6/18/2011 7:00 AM T M M M M
6/19/2011 9:00 AM 0.04 M M M M
6/20/2011 7:00 AM 0.01 M M M M
6/21/2011 7:00 AM 0.00 0.0 M M M
6/22/2011 7:00 AM 0.00 0.0 M M M
6/23/2011 7:00 AM 0.04 M M M M
6/24/2011 7:00 AM 0.17 M M M M A brief but intense t-storm rolled through at 1:30 pm, sparking a nearby structure fire.
6/25/2011 8:00 AM 0.00 0.0 M M M
6/26/2011 7:00 AM 0.00 0.0 M M M
6/27/2011 6:00 AM 0.00 0.0 M M M
6/28/2011 9:00 AM 0.00 0.0 M M M
6/29/2011 7:00 AM 0.00 0.0 M M M
6/30/2011 7:00 AM 0.40 M M M M A moderate t-storm yesterday afternoon yielded .35", with another .05" overnight from light showers.
7/1/2011 7:00 AM 0.00 0.0 M M M Total June precip came in 25% above normal at 2.16". For the first half of the year, total precip was 9.12" vs. 7.14" normal. This included 28.9" of snow.
7/2/2011 7:00 AM 0.00 0.0 M M M
7/3/2011 7:00 AM 0.00 0.0 M M M
7/4/2011 8:00 AM 0.00 0.0 M M M
7/5/2011 7:00 AM 0.00 0.0 M M M
7/6/2011 7:00 AM 0.00 0.0 M M M
7/7/2011 7:00 AM 0.00 0.0 M M M
7/8/2011 7:00 AM 0.01 M M M M
7/9/2011 7:00 AM 0.00 0.0 M M M
7/10/2011 8:00 AM 0.00 0.0 M M M Ten days into July with only .01" of precip. It's getting mighty dry.
7/11/2011 7:00 AM 0.00 0.0 M M M
7/12/2011 7:00 AM 0.00 0.0 M M M
7/13/2011 7:30 AM 0.22 M M M M Yesterday's t-storm activity provided .22" of much-needed moisture.
7/14/2011 7:00 AM 0.57 M M M M A refreshing rain, with a two-day total of .79".
7/15/2011 7:00 AM T M M M M
7/16/2011 7:00 AM T M M M M
7/17/2011 8:00 AM 0.05 M M M M
7/18/2011 7:00 AM 0.00 0.0 M M M
7/19/2011 7:00 AM 0.00 0.0 M M M
7/20/2011 7:00 AM 0.12 M M M M Only .12 rain, but strong outflow winds knocked out the power for a couple of hours.
7/21/2011 7:00 AM 0.00 0.0 M M M
7/24/2011 7:00 AM 0.00 0.0 M M M Awoke yesterday morning in the Lolo National Forest to a coating of frost on elevated surfaces. Stream water temps were still too nippy to swim.
7/25/2011 7:00 AM T M M M M
7/26/2011 7:00 AM T M M M M
7/27/2011 7:00 AM 0.00 0.0 M M M
7/28/2011 7:00 AM 0.00 0.0 M M M
7/29/2011 7:00 AM 0.00 0.0 M M M
7/30/2011 7:00 AM 0.00 0.0 M M M
7/31/2011 7:00 AM T M M M M
8/1/2011 7:00 AM 0.07 M M M M August got off to a damp start with .07" from pre-dawn showers, with July ending with 1.06" total precip, vs 1.09" normal.
8/2/2011 7:00 AM 0.04 M M M M Moderate t-storm with vivid lightning rolled through at 1:30 am.
8/3/2011 7:00 AM 0.00 0.0 M M M
8/4/2011 7:00 AM 0.00 0.0 M M M
8/5/2011 8:00 AM T M M M M
8/6/2011 7:00 AM T M M M M
8/7/2011 7:00 AM 0.00 0.0 M M M
8/8/2011 7:00 AM 0.00 0.0 M M M
8/9/2011 7:00 AM 0.00 0.0 M M M
8/10/2011 7:00 AM 0.00 0.0 M M M
8/11/2011 7:00 AM 0.03 M M M M
8/12/2011 8:00 AM 0.00 0.0 M M M
8/13/2011 9:00 AM 0.00 0.0 M M M
8/14/2011 7:00 AM T M M M M
8/15/2011 7:00 AM 0.00 0.0 M M M
8/16/2011 7:00 AM 0.00 0.0 M M M
8/17/2011 5:00 AM 0.00 0.0 M M M
8/18/2011 7:00 AM 0.00 0.0 M M M
8/19/2011 7:00 AM 0.00 0.0 M M M
8/20/2011 7:00 AM 0.00 0.0 M M M
8/21/2011 7:00 AM 0.00 0.0 M M M
8/22/2011 7:00 AM 0.00 0.0 M M M
8/23/2011 7:00 AM 0.00 0.0 M M M Yesterday's high temp of 97 was the hottest of the season thus far, with bouts of mid-level smoke from the Saddle Complex fire.
8/24/2011 7:00 AM 0.00 0.0 M M M
8/25/2011 7:00 AM T M M M M Trace from early morning shower, with gusty winds, but no lightning. Wind cleared moderate smoke, which had vis. reduced to 4-6 miles late yesterday.
8/26/2011 7:00 AM 0.00 0.0 M M M
8/27/2011 7:00 AM 0.00 0.0 M M M
8/28/2011 8:00 AM 0.00 0.0 M M M Moderate smoke late Saturday as Idaho's Storm Complex fire west of St. Mary's peak poured smoke into the Bitterroot Valley.
8/29/2011 7:00 AM 0.11 M M M M First measurable rain in 17 days!
8/30/2011 7:00 AM 0.02 M M M M Precip was from lingering showers on Monday morning.
8/31/2011 7:00 AM T M M M M August total precip was much below normal: .27" actual vs 1.15 average. The dry conditions fueled the lightning-caused 41 Complex Fire in the Sapphires Tuesday afternoon.
9/1/2011 7:00 AM 0.08 M M M M Precip is from yesterday's fropa.
9/2/2011 7:00 AM T M M M M
9/3/2011 7:00 AM 0.00 0.0 M M M
9/4/2011 7:00 AM 0.00 0.0 M M M Low and mid-level inversion continues, with trapped smoke limiting visibilities.
9/5/2011 7:00 AM 0.00 0.0 M M M The 41 Complex fire in the Sapphire Mtns was very active yesterday afternoon, sending copius amounts of smoke into the Bitterroot Valley. Currently, calm wind, moderate smoke, with 4-8 mile visibilty.
9/6/2011 7:00 AM 0.00 0.0 M M M Smoke inversions continue.
9/7/2011 7:00 AM 0.00 0.0 M M M Smoke conditions worsened in the Bitterroot Valley yesterday, with visibility limited to 2-4 miles in thick brown smoke. Some improvement observed in the afternoon as breezes increased. This morning is starting out much the same, with vis. at 2-4 miles.
9/8/2011 7:00 AM 0.00 0.0 M M M Smoke reduced visibilities to 1-3 miles yesterday into this morning, as the air quality idex reached the unhealthy stage. The 41 Complex Fire has backed into valley drainages, with active downslope spotting observed at 9 pm. A Type I Management Team assumed command at 6 am this morning. Current conditions: Heavy smoke, visibility at 2 miles, 53 degrees, with a light N breeze (though higher level smoke clouds observed moving to the NE).
9/9/2011 7:00 AM 0.00 0.0 M M M The 41 Complex Fire grew to 6,000 acres yesterday, with some movement to the south and west. Strong daytime inversion lifted only slightly in the late afternoon. Currently: Heavy smoke, 2 mile vis., light N wind, and a temp of 54.
9/10/2011 7:00 AM T M M M M High-based showers developed near the 41 Fire Complex yesterday afternoon, producing sprinkles and moderate outflow winds that lifted some of the smoke. The fire grew another 1100 acres and is projected to continue backing westward toward the valley. Currently: moderate smoke with 4-8 mile vis, light N/NE wind, and a temp of 53.
9/11/2011 7:00 AM 0.00 0.0 M M M The 41 Fire Complex, burning 4 NA miles SE of this location, put up significant plumes yesterday, which drifted SW and then NW into the Bitterroot Valley. It grew another 500 acres to 7600 acres. Work began on a secondary fire line on private valley land to the west of the fire. Air quality was not quite as poor yesterday.
9/12/2011 7:00 AM 0.00 0.0 M M M Favorable west breezes mitigated yesterday's 41 Complex smoke only to have the Storm Complex, burning for resource benefit west of St Mary's Peak, put up two significant smoke columns, which blew right into the valley. Currently, moderate smoke, 4-6 mile vis, light N/NE wind, and a temp of 54.
9/13/2011 7:00 AM 0.00 0.0 M M M The bulk of yesterday's smoke activity shifted to the northern Bitterroot as the Storm Complex Fire burning west of St. Mary's Peak grew from 200 to 1,350 acres. The 41 Complex Fire remained active at 8,300 acres. Forecasted easterly winds into Wednesday may pose a test of fire lines adjoining valley land.
9/14/2011 7:00 AM 0.00 0.0 M M M Gusty easterly winds stirred the 41 Fire Complex overnight, but no word yet on how the fire lines held. The fire, burning in the Sapphires 4 NA miles SE of this location, surpassed 10,000 acres yesterday. Currently, areas of smoke with a light east wind.
9/15/2011 7:00 AM 0.00 0.0 M M M Dense smoke returned overnight, with current visibility at 2-4 miles.
9/16/2011 7:00 AM 0.33 M M M M The .33" is the first measurable precip in 14 days and should help calm nearby wildland fires.
9/17/2011 7:00 AM 0.00 0.0 M M M Though the rainfall reported Thursday into Friday across the valley only ranged from .25 to .66, it calmed the wildland fires and cleared the air.
9/18/2011 8:00 AM T M M M M
9/19/2011 7:00 AM 0.02 M M M M
9/20/2011 7:00 AM 0.03 M M M M
9/21/2011 7:00 AM 0.00 0.0 M M M An overnight low of 41 at this location 700' above the valley floor.
9/22/2011 7:00 AM 0.00 0.0 M M M
9/23/2011 7:00 AM 0.00 0.0 M M M
9/24/2011 7:00 AM 0.00 0.0 M M M Areas of smoke have settled back into the Bitterroot Valley, courtesy of lingering wildfires.
9/25/2011 8:00 AM 0.00 0.0 M M M
9/26/2011 7:00 AM 0.05 M M M M Hopefully, the precip and higher RH will cool the 41 Fire, which was casting an orange glow in the nightime sky prior to the main shower activity.
9/27/2011 7:00 AM 0.00 0.0 M M M Interesting to note that year-to-date precip at MSO NWS has now dipped to below average.
9/28/2011 7:00 AM 0.00 0.0 M M M
9/29/2011 7:00 AM 0.00 0.0 M M M
9/30/2011 7:00 AM 0.00 0.0 M M M September total precip was much below normal: .51" actual vs. 1.14" average.



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
10/1/2010 10/02/2010 8:00 AM 2 0.00 M M
4/12/2011 4/13/2011 6:00 PM 2 0.01 0.0 M Precip fell on April 12 as graupel.
4/30/2011 5/01/2011 8:00 AM 2 T 0.0 0.00
7/22/2011 7/23/2011 4:00 PM 2 0.09 M M Rain is from early Friday, July 22.



Observation Date Observation Time Notes Largest Stone Size Average Stone Size Smallest Stone Size Stone Consistency Duration Minutes Durration Accuracy Damage Timing More Rain than Hail Hail Started Largest Hail Started Angle of Impact Number of Stones on Pad Distance Between Stones on Pad Depth of Stones on Ground
5/16/2011 7:09 AM Hail fell intensly, coating surfaces with a layer of ice pellets. 1/4" Pea Size 1/4" Pea Size Rice White Ice 6 no damage False Before rain After smaller hail
6/23/2011 1:33 PM Storm deposited .17" of rain in a 20-minute period. Several cloud-to-ground lightning strikes observed. 3/8" 1/4" Pea Size 1/4" Pea Size Hard 8 2min no damage True Same time as rain Same time as smaller hail 10-20
8/10/2011 6:23 PM Storm was building overhead, could become stronger as it moves east. 1/4" Pea Size 1/4" Pea Size 1/4" Pea Size White Ice 4 1min no damage Intermittent True After rain Same time as smaller hail