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 11 0.85 2.14 31 2.14 31 0.00 0 0 16 6 0.0 0 0
Nov 11 0.96 0.55 30 0.55 30 0.00 0 0 11 9 5.7 8 7
Dec 11 0.84 0.61 31 0.61 31 0.00 0 0 7 11 5.1 4 19
Jan 12 0.95 0.85 31 0.85 31 0.00 0 0 8 12 8.0 4 7
Feb 12 0.81 0.71 29 0.71 29 0.00 0 0 6 15 4.7 6 7
March 12 1.15 1.25 31 1.25 31 0.00 0 0 16 4 6.2 9 6
April 12 1.42 0.81 30 0.81 30 0.00 0 0 9 10 2.7 2 2
May 12 2.02 1.18 31 1.18 31 0.00 0 0 10 6 0.0 0 0
June 12 2.28 1.87 30 1.77 24 0.10 6 2 10 4 0.0 0 0
July 12 1.17 1.15 31 1.15 31 0.00 0 0 8 3 0.0 0 0
Aug 12 1.12 0.19 31 0.19 31 0.00 0 0 3 2 0.0 0 0
Sept 12 1.12 0.00 30 0.00 30 0.00 0 0 0 0 0.0 0 0
Water Year Totals: 14.69" 11.31" 366 days 11.21" 360 0.10" 6 days 2 104 days 82 days 32.4" 33 days 48 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
10/1/2011 0.00
10/2/2011 0.03
10/3/2011 T
10/4/2011 T
10/5/2011 0.38
10/6/2011 0.84
10/7/2011 0.05
10/8/2011 0.11
10/9/2011 0.00
10/10/2011 0.00
10/11/2011 0.10
10/12/2011 0.15
10/13/2011 T
10/14/2011 0.05
10/15/2011 0.04
10/16/2011 0.10
10/17/2011 0.10
10/18/2011 0.00
10/19/2011 0.00
10/20/2011 0.00
10/21/2011 0.01
10/22/2011 0.01
10/23/2011 0.02
10/24/2011 0.12
10/25/2011 T
10/26/2011 T
10/27/2011 0.00
10/28/2011 0.00
10/29/2011 0.00
10/30/2011 T
10/31/2011 0.03
11/1/2011 0.01
11/2/2011 T
11/3/2011 0.00
11/4/2011 0.00
11/5/2011 0.02
11/6/2011 T
11/7/2011 0.00
11/8/2011 0.00
11/9/2011 T
11/10/2011 0.00
11/11/2011 0.00
11/12/2011 0.08
11/13/2011 T
11/14/2011 0.02
11/15/2011 0.11
11/16/2011 0.02
11/17/2011 T
11/18/2011 0.02
11/19/2011 0.19
11/20/2011 0.03
11/21/2011 0.00
11/22/2011 T
11/23/2011 T
11/24/2011 0.00
11/25/2011 0.04
11/26/2011 0.01
11/27/2011 0.00
11/28/2011 T
11/29/2011 0.00
11/30/2011 T
12/1/2011 0.01
12/2/2011 0.00
12/3/2011 T
12/4/2011 0.14
12/5/2011 T
12/6/2011 0.00
12/7/2011 0.00
12/8/2011 0.00
12/9/2011 0.00
12/10/2011 0.00
12/11/2011 0.00
12/12/2011 0.00
12/13/2011 0.00
12/14/2011 T
12/15/2011 T
12/16/2011 T
12/17/2011 T
12/18/2011 0.00
12/19/2011 T
12/20/2011 0.00
12/21/2011 T
12/22/2011 0.11
12/23/2011 0.00
12/24/2011 0.00
12/25/2011 T
12/26/2011 T
12/27/2011 T
12/28/2011 0.01
12/29/2011 0.17
12/30/2011 0.01
12/31/2011 0.16
Day of YearDaily PrcpMultiday Prcp
1/1/2012 T
1/2/2012 T
1/3/2012 0.00
1/4/2012 0.00
1/5/2012 0.00
1/6/2012 T
1/7/2012 0.00
1/8/2012 0.00
1/9/2012 0.00
1/10/2012 T
1/11/2012 0.08
1/12/2012 T
1/13/2012 0.00
1/14/2012 0.00
1/15/2012 0.00
1/16/2012 T
1/17/2012 T
1/18/2012 0.10
1/19/2012 0.30
1/20/2012 0.18
1/21/2012 0.07
1/22/2012 0.10
1/23/2012 0.00
1/24/2012 T
1/25/2012 T
1/26/2012 0.01
1/27/2012 0.01
1/28/2012 0.00
1/29/2012 T
1/30/2012 T
1/31/2012 T
2/1/2012 T
2/2/2012 T
2/3/2012 T
2/4/2012 0.00
2/5/2012 0.00
2/6/2012 0.00
2/7/2012 0.00
2/8/2012 0.00
2/9/2012 T
2/10/2012 T
2/11/2012 0.01
2/12/2012 0.02
2/13/2012 T
2/14/2012 T
2/15/2012 T
2/16/2012 T
2/17/2012 T
2/18/2012 T
2/19/2012 0.00
2/20/2012 T
2/21/2012 T
2/22/2012 0.17
2/23/2012 0.42
2/24/2012 T
2/25/2012 0.06
2/26/2012 0.03
2/27/2012 T
2/28/2012 0.00
2/29/2012 0.00
3/1/2012 0.02
3/2/2012 0.01
3/3/2012 T
3/4/2012 T
3/5/2012 0.00
3/6/2012 0.07
3/7/2012 T
3/8/2012 0.00
3/9/2012 0.00
3/10/2012 0.00
3/11/2012 0.00
3/12/2012 0.02
3/13/2012 0.00
3/14/2012 0.01
3/15/2012 0.02
3/16/2012 0.13
3/17/2012 0.25
3/18/2012 0.24
3/19/2012 0.27
3/20/2012 0.00
3/21/2012 0.04
3/22/2012 0.02
3/23/2012 0.00
3/24/2012 0.02
3/25/2012 0.00
3/26/2012 0.00
3/27/2012 0.01
3/28/2012 0.00
3/29/2012 0.03
3/30/2012 T
3/31/2012 0.09
Day of YearDaily PrcpMultiday Prcp
4/1/2012 0.02
4/2/2012 0.02
4/3/2012 0.00
4/4/2012 0.00
4/5/2012 T
4/6/2012 0.04
4/7/2012 0.18
4/8/2012 0.00
4/9/2012 0.00
4/10/2012 0.00
4/11/2012 0.00
4/12/2012 0.07
4/13/2012 T
4/14/2012 0.00
4/15/2012 0.00
4/16/2012 T
4/17/2012 T
4/18/2012 T
4/19/2012 0.08
4/20/2012 T
4/21/2012 T
4/22/2012 0.00
4/23/2012 T
4/24/2012 T
4/25/2012 0.02
4/26/2012 0.15
4/27/2012 0.23
4/28/2012 T
4/29/2012 0.00
4/30/2012 0.00
5/1/2012 0.15
5/2/2012 T
5/3/2012 T
5/4/2012 0.03
5/5/2012 0.30
5/6/2012 T
5/7/2012 0.00
5/8/2012 0.00
5/9/2012 0.00
5/10/2012 0.00
5/11/2012 0.00
5/12/2012 0.00
5/13/2012 0.00
5/14/2012 0.00
5/15/2012 0.00
5/16/2012 0.00
5/17/2012 0.00
5/18/2012 0.01
5/19/2012 0.00
5/20/2012 0.00
5/21/2012 0.00
5/22/2012 0.21
5/23/2012 0.03
5/24/2012 T
5/25/2012 T
5/26/2012 0.01
5/27/2012 0.30
5/28/2012 0.09
5/29/2012 T
5/30/2012 0.05
5/31/2012 0.00
6/1/2012 **
6/2/2012 **
6/3/2012 0.10
6/4/2012 T
6/5/2012 0.13
6/6/2012 0.76
6/7/2012 0.00
6/8/2012 0.04
6/9/2012 0.19
6/10/2012 0.01
6/11/2012 0.02
6/12/2012 0.00
6/13/2012 0.50
6/14/2012 T
6/15/2012 0.00
6/16/2012 0.00
6/17/2012 0.02
6/18/2012 T
6/19/2012 0.09
6/20/2012 T
6/21/2012 0.00
6/22/2012 **
6/23/2012 **
6/24/2012 0.00
6/25/2012 0.00
6/26/2012 0.00
6/27/2012 0.01
6/28/2012 0.00
6/29/2012 0.00
6/30/2012 0.00
Day of YearDaily PrcpMultiday Prcp
7/1/2012 0.00
7/2/2012 0.01
7/3/2012 0.00
7/4/2012 0.00
7/5/2012 0.00
7/6/2012 0.00
7/7/2012 0.00
7/8/2012 0.00
7/9/2012 0.00
7/10/2012 T
7/11/2012 0.07
7/12/2012 0.01
7/13/2012 0.00
7/14/2012 0.02
7/15/2012 0.91
7/16/2012 T
7/17/2012 0.01
7/18/2012 0.06
7/19/2012 0.00
7/20/2012 0.00
7/21/2012 T
7/22/2012 0.00
7/23/2012 0.00
7/24/2012 0.00
7/25/2012 0.00
7/26/2012 0.00
7/27/2012 0.00
7/28/2012 0.06
7/29/2012 0.00
7/30/2012 0.00
7/31/2012 0.00
8/1/2012 0.00
8/2/2012 0.00
8/3/2012 0.01
8/4/2012 0.00
8/5/2012 0.00
8/6/2012 0.00
8/7/2012 0.00
8/8/2012 0.00
8/9/2012 0.06
8/10/2012 0.00
8/11/2012 0.00
8/12/2012 0.00
8/13/2012 0.00
8/14/2012 0.00
8/15/2012 0.00
8/16/2012 0.00
8/17/2012 0.00
8/18/2012 0.00
8/19/2012 0.00
8/20/2012 0.00
8/21/2012 T
8/22/2012 0.12
8/23/2012 0.00
8/24/2012 0.00
8/25/2012 0.00
8/26/2012 0.00
8/27/2012 0.00
8/28/2012 T
8/29/2012 0.00
8/30/2012 0.00
8/31/2012 0.00
9/1/2012 0.00
9/2/2012 0.00
9/3/2012 0.00
9/4/2012 0.00
9/5/2012 0.00
9/6/2012 0.00
9/7/2012 0.00
9/8/2012 0.00
9/9/2012 0.00
9/10/2012 0.00
9/11/2012 0.00
9/12/2012 0.00
9/13/2012 0.00
9/14/2012 0.00
9/15/2012 0.00
9/16/2012 0.00
9/17/2012 0.00
9/18/2012 0.00
9/19/2012 0.00
9/20/2012 0.00
9/21/2012 0.00
9/22/2012 0.00
9/23/2012 0.00
9/24/2012 0.00
9/25/2012 0.00
9/26/2012 0.00
9/27/2012 0.00
9/28/2012 0.00
9/29/2012 0.00
9/30/2012 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2011 7:00 AM 0.00 0.0 M M M Active burning on the Idaho side of the Bitterroot chain resulted in widespread smoke settling into the valley overnight, with current visibility of 4-6 miles.
10/2/2011 7:00 AM 0.03 M M M M T-cell passed by at 8 pm, with some rain and lightning.
10/3/2011 7:00 AM T M M M M
10/4/2011 7:00 AM T M M M M
10/5/2011 7:00 AM 0.38 M M M M The .38" is the greatest 24-hour catch since July 14.
10/6/2011 7:00 AM 0.84 M M M M The .84" results in a two-day storm total of 1.22" rain.
10/7/2011 8:00 AM 0.05 M M M M The additional .05" brings the three-day running storm total to 1.27" rain.
10/8/2011 8:00 AM 0.11 M M M M
10/9/2011 7:00 AM 0.00 0.0 M M M First frost of the season at this mid-slope location, with an overnight low of 31.7 degrees.
10/10/2011 7:00 AM 0.00 0.0 M M M
10/11/2011 8:00 AM 0.10 M M M M
10/12/2011 7:00 AM 0.15 M M M M A graupel shower moved through at 2:30 pm leaving a covering of slush. Two-day precip total of .25" liquid.
10/13/2011 7:00 AM T M M M M
10/14/2011 8:00 AM 0.05 M M M M
10/15/2011 8:00 AM 0.04 M M M M Areas of dense fog this morning, with visibility < .25 mile at times.
10/16/2011 9:00 AM 0.10 M M M M
10/17/2011 7:00 AM 0.10 M M M M Dense fog coverage has rapidly increased over the past 90 minutes from the valley floor up to this mid-slope location. With current temp of 30, light icing observed mainly on raised surfaces.
10/18/2011 7:00 AM 0.00 0.0 M M M
10/19/2011 7:00 AM 0.00 0.0 M M M
10/20/2011 7:00 AM 0.00 0.0 M M M
10/21/2011 8:00 AM 0.01 M M M M
10/22/2011 7:00 AM 0.01 M M M M
10/23/2011 7:00 AM 0.02 M M M M
10/24/2011 8:00 AM 0.12 M M M M
10/25/2011 7:00 AM T T M T M First snow of the season, though only a dusting.
10/26/2011 7:00 AM T T M 0.0 M
10/27/2011 7:00 AM 0.00 0.0 M M M
10/28/2011 7:00 AM 0.00 0.0 M M M
10/29/2011 7:00 AM 0.00 0.0 M M M
10/30/2011 7:00 AM T M M M M
10/31/2011 8:00 AM 0.03 M M M M
11/1/2011 7:00 AM 0.01 T M T M October total precip was well above normal: 2.14" actual vs .88" average. Precip was observed on 22 days of the month.
11/2/2011 7:00 AM T T M 0.0 M
11/3/2011 7:00 AM 0.00 0.0 M M M
11/4/2011 7:00 AM 0.00 0.0 M M M
11/5/2011 7:00 AM 0.02 0.3 M 0.5 M First measurable snow of the season.
11/6/2011 7:00 AM T T M T M
11/7/2011 7:00 AM 0.00 0.0 M T M
11/8/2011 7:00 AM 0.00 0.0 M T M
11/9/2011 7:00 AM T T M 0.0 M
11/10/2011 7:00 AM 0.00 0.0 M 0.0 M
11/11/2011 7:00 AM 0.00 0.0 M 0.0 M
11/12/2011 7:00 AM 0.08 0.2 M T M Rain showers transitioned to snow pellets and then snow between 2-3 a.m.
11/13/2011 7:00 AM T T M T M
11/14/2011 7:00 AM 0.02 T M T M
11/15/2011 7:00 AM 0.11 1.3 M 1.5 M Accumulating snow from overnight moderate snow bands.
11/16/2011 7:00 AM 0.02 0.2 M 1.0 M Sufficient snow cover to drop the overnight low temp to 8 above.
11/17/2011 7:00 AM T 0.0 M T M Overnight temp rose from 19 to the current reading of 38, with light rain showers and gusty SW winds at obsv time.
11/18/2011 7:00 AM 0.02 T M T M Light snow has developed over the past hour, with a brisk S wind and a current temp of 27.
11/19/2011 7:00 AM 0.19 2.7 M 3.0 M Accumulating snow fell between 4 p.m. and 2 a.m.
11/20/2011 7:00 AM 0.03 0.6 M 3.0 M Snow showers from late afternoon through the night.
11/21/2011 7:00 AM 0.00 0.0 M 2.5 M
11/22/2011 7:00 AM T 0.0 M 1.0 M
11/23/2011 7:00 AM T 0.0 M T M
11/24/2011 7:00 AM 0.00 0.0 M 0.0 M
11/25/2011 7:00 AM 0.04 0.2 M T M
11/26/2011 7:00 AM 0.01 0.2 M T M
11/27/2011 7:00 AM 0.00 0.0 M T M
11/28/2011 7:00 AM T 0.0 M 0.0 M
11/29/2011 7:00 AM 0.00 0.0 M 0.0 M
11/30/2011 7:00 AM T T M T M After a wet October, November precip was below normal: .55" actual vs .97" avg. This included 5.7" of snow.
12/1/2011 7:00 AM 0.01 0.2 M T M
12/2/2011 7:00 AM 0.00 0.0 M T M
12/3/2011 7:00 AM T T M T M
12/4/2011 8:00 AM 0.14 2.0 M 2.0 M Light to moderate snow has tapered off to flurries with some breaks in the overcast and improving visibility (.5 mile), stiff N/NE winds with some blowing snow, and a rising BP.
12/5/2011 7:00 AM T T M 1.5 M
12/6/2011 7:00 AM 0.00 0.0 M 1.5 M
12/7/2011 7:00 AM 0.00 0.0 M 1.0 M
12/8/2011 7:00 AM 0.00 0.0 M 1.0 M
12/9/2011 7:00 AM 0.00 0.0 M 1.0 M
12/10/2011 7:00 AM 0.00 0.0 M 1.0 M
12/11/2011 7:00 AM 0.00 0.0 M 1.0 M In comparing the data for Oct 1 to Dec 10 in 2010 and 2011 at this location, it's interesting to note that 2010 had 2.84" liquid and 2011 had 2.85" liquid. Also, after dipping below normal in the late summer, the 2011 YTD precip is now running an inch above normal. Both data points suggest a return to a La Nina pattern.
12/12/2011 7:00 AM 0.00 0.0 M 1.0 M
12/13/2011 7:00 AM 0.00 0.0 M 1.0 M
12/14/2011 7:00 AM T T M 1.0 M
12/15/2011 7:00 AM T T M 0.5 M
12/16/2011 7:00 AM T T M 0.5 M
12/17/2011 7:00 AM T T M T M
12/18/2011 7:00 AM 0.00 0.0 M T M
12/19/2011 7:00 AM T T M T M
12/20/2011 7:00 AM 0.00 0.0 M T M
12/21/2011 7:00 AM T T M T M
12/22/2011 7:00 AM 0.11 2.8 M 2.5 M Accumulating snow fell between 9:30 a.m. and 2:30 p.m.
12/23/2011 7:00 AM 0.00 0.0 M 2.0 M
12/24/2011 7:00 AM 0.00 0.0 M 1.5 M
12/25/2011 7:00 AM T T M 1.0 M
12/26/2011 7:00 AM T T M 1.0 M
12/27/2011 7:00 AM T T M 0.5 M Light flurry at obv time.
12/28/2011 7:00 AM 0.01 T M T M
12/29/2011 7:00 AM 0.17 T M T M Gusty winds and wet snow accompanied this morning's fropa. Currently, lingering snow showers, brisk winds, and a temp of 33.
12/30/2011 7:00 AM 0.01 T M T M
12/31/2011 7:00 AM 0.16 0.1 M T M Lingering flurries at obv time.
1/1/2012 7:00 AM T T M T M Much like Nov, Dec precip was somewhat below normal: .61" actual vs 1.04" normal. The total 2011 precip, however, came in slightly above normal: 14.26" actual vs 14.13" normal. The 2011 total included 39.7" of snow. We'll see what 2012 brings!
1/2/2012 7:00 AM T T M T M
1/3/2012 7:00 AM 0.00 0.0 M 0.0 M
1/4/2012 7:00 AM 0.00 0.0 M 0.0 M
1/5/2012 7:00 AM 0.00 0.0 M 0.0 M With temps in the 50s and plenty of sun, yesterday I threw a load of laundry up on the outside line, had lunch on the outside deck, and did some gardening. It was springtime in the Rockies...three months too early.
1/6/2012 7:00 AM T T M T M
1/7/2012 7:00 AM 0.00 0.0 M 0.0 M
1/8/2012 7:00 AM 0.00 0.0 M 0.0 M
1/9/2012 7:00 AM 0.00 0.0 M 0.0 M
1/10/2012 7:00 AM T 0.0 M 0.0 M Overnight temp rose to current reading of 39, with light rain just getting underway.
1/11/2012 7:00 AM 0.08 1.0 M 1.0 M Snow squall moved through from 7-9 pm.
1/12/2012 7:00 AM T T M 1.0 M
1/13/2012 7:00 AM 0.00 0.0 M 1.0 M
1/14/2012 7:00 AM 0.00 0.0 M 0.5 M
1/15/2012 7:00 AM 0.00 0.0 M T M
1/16/2012 7:00 AM T T T T M Currently: Light snow and 11 degrees.
1/17/2012 7:00 AM T T M T M
1/18/2012 7:00 AM 0.10 1.1 M 1.0 M
1/19/2012 7:00 AM 0.30 5.7 M 4.0 M Heavy afternoon snow transitioned to light freezing rain yesterday evening, with the temp hovering near 20. The overnight temp then rose overnight to the current reading of 33, with light rain. Two-day storm totals: 6.8" snow, with a SWE of .40", including light frz rn and rn.
1/20/2012 7:00 AM 0.18 0.0 M 2.0 M
1/21/2012 8:00 AM 0.07 T M T M Moderate rain shower and a current temp of 37.
1/22/2012 7:00 AM 0.10 0.2 M T M An even .10 liquid from rain and then snow showers.
1/23/2012 7:00 AM 0.00 0.0 M T M
1/24/2012 7:00 AM T T M T M
1/25/2012 7:00 AM T 0.0 M 0.0 M
1/26/2012 7:00 AM 0.01 T M 0.0 M
1/27/2012 7:00 AM 0.01 T M 0.0 M
1/28/2012 7:00 AM 0.00 0.0 M 0.0 M
1/29/2012 7:00 AM T 0.0 M 0.0 M
1/30/2012 7:00 AM T 0.0 M 0.0 M
1/31/2012 7:00 AM T T M 0.0 M
2/1/2012 7:00 AM T T M 0.0 M Despite impressive amounts to the north, total January precip at this Bitterroot location was exactly average with .85 liquid, including 8" of snow.
2/2/2012 7:00 AM T T M T M Lingering light snow showers currently.
2/3/2012 7:00 AM T T M 0.0 M
2/4/2012 7:00 AM 0.00 0.0 M 0.0 M
2/5/2012 7:00 AM 0.00 0.0 M 0.0 M
2/6/2012 7:00 AM 0.00 0.0 M 0.0 M
2/7/2012 7:00 AM 0.00 0.0 M 0.0 M
2/8/2012 7:00 AM 0.00 0.0 M 0.0 M
2/9/2012 7:00 AM T T M T M
2/10/2012 7:00 AM T T M T M Currently, light frz rn mixed with snow and a temp of 30.
2/11/2012 7:00 AM 0.01 0.2 M T M Light freezing drizzle has coated hard surfaces with a thin layer of ice. Current temp is 27.
2/12/2012 7:00 AM 0.02 0.3 M T M Snow accumulation is from yesterday morning, with only a dusting overnight.
2/13/2012 7:00 AM T T M 0.0 M Dense frz fog currently, with vis < .25 mi.
2/14/2012 7:00 AM T T M 0.0 M
2/15/2012 7:00 AM T T M 0.0 M Light flurry activity has developed at obv time.
2/16/2012 7:00 AM T T M 0.0 M
2/17/2012 7:00 AM T T M 0.0 M Light snow was developing at obv time.
2/18/2012 7:00 AM T 0.1 M T M
2/19/2012 7:00 AM 0.00 0.0 M 0.0 M
2/20/2012 7:00 AM T T M 0.0 M
2/21/2012 7:00 AM T T M T M
2/22/2012 7:00 AM 0.17 T M 0.0 M Light rain and 5-15 S winds overnight through obv time, with a current temp of 37.
2/23/2012 7:00 AM 0.42 3.2 M 3.0 M Two-day liquid storm total of .59", including the SWE from last night's 3.2" snow.
2/24/2012 7:00 AM T T M 2.0 M
2/25/2012 7:00 AM 0.06 0.6 M 1.5 M First snow band moved through at 5 a.m., and second band just after obv time, with light snow continuing and a current temp of 31.
2/26/2012 7:00 AM 0.03 0.3 M 1.0 M
2/27/2012 7:00 AM T T M 1.0 M
2/28/2012 7:00 AM 0.00 0.0 M 1.0 M
2/29/2012 7:00 AM 0.00 0.0 M 0.5 M
3/1/2012 7:00 AM 0.02 0.4 M 0.5 M Feb total precip was normal: .71" actual vs .70" avg. This included 4.7" of snow.
3/2/2012 7:00 AM 0.01 0.2 M 0.5 M
3/3/2012 7:00 AM T T M T M
3/4/2012 7:00 AM T 0.0 M T M
3/5/2012 7:00 AM 0.00 0.0 M 0.0 M
3/6/2012 7:00 AM 0.07 T M T M
3/7/2012 7:00 AM T T M T M NOAA's Space Weather Prediction Center reported one of the largest solar flares of the current solar cycle occurred late Tuesday. It's unclear if this flare will affect Earth, but vivid Aurora Borealis displays are possible Thursday into Friday.
3/8/2012 7:00 AM 0.00 0.0 M 0.0 M
3/9/2012 7:00 AM 0.00 0.0 M 0.0 M
3/10/2012 7:00 AM 0.00 0.0 M 0.0 M
3/11/2012 8:00 AM 0.00 0.0 M 0.0 M
3/12/2012 7:00 AM 0.02 0.3 M 0.5 M Snow fell in the post-fropa environment.
3/13/2012 7:00 AM 0.00 0.0 M 0.0 M
3/14/2012 7:00 AM 0.01 0.1 M T M Sharp cold front punched through at 2 pm with a quick 26 degree drop in temps from 54 to 28. Currently, light snow and 26.
3/15/2012 7:00 AM 0.02 0.4 M 0.0 M
3/16/2012 7:00 AM 0.13 0.0 M 0.0 M Made it up to 63 yesterday with strong SW downsloping winds. It's a different story this morning, with light rain, gusty N winds, and a current temp of 33.
3/17/2012 7:00 AM 0.25 T M 0.0 M The .25" liquid accumulation is exact, with a two-day storm total of .38" liquid.
3/18/2012 7:00 AM 0.24 0.5 M T M A three-day storm total of .62" liquid. Currently, light snow and 28 degrees.
3/19/2012 7:00 AM 0.27 3.8 M 4.0 M Snow accumulated from 7 pm into the pre-dawn hours, bringing the four-day storm total to .89" liquid.
3/20/2012 7:00 AM 0.00 0.0 M 1.0 M
3/21/2012 7:00 AM 0.04 0.3 M 0.5 M Rain/snow mix turned over to snow in the predawn hours, with snow sticking to grassy and raised surfaces. Currently, snow and fog, with a half mile vis., calm wind, and a temp of 31.
3/22/2012 7:00 AM 0.02 0.2 M 0.0 M
3/23/2012 7:00 AM 0.00 0.0 M 0.0 M
3/24/2012 7:00 AM 0.02 T M 0.0 M
3/25/2012 7:00 AM 0.00 0.0 M 0.0 M
3/26/2012 7:00 AM 0.00 0.0 M 0.0 M
3/27/2012 7:00 AM 0.01 0.0 M 0.0 M
3/28/2012 7:00 AM 0.00 0.0 M 0.0 M
3/29/2012 7:00 AM 0.03 T M 0.0 M
3/30/2012 7:00 AM T 0.0 M 0.0 M
3/31/2012 7:00 AM 0.09 0.0 M 0.0 M
4/1/2012 7:00 AM 0.02 0.0 M 0.0 M March total precip was above normal: 1.25" actual vs 1.00" avg. This included 6.2" of snow.
4/2/2012 7:00 AM 0.02 T M 0.0 M
4/3/2012 7:00 AM 0.00 0.0 M 0.0 M
4/4/2012 7:00 AM 0.00 0.0 M 0.0 M
4/5/2012 7:00 AM T 0.0 M 0.0 M
4/6/2012 7:00 AM 0.04 0.5 M 0.5 M Snow began in the pre-dawn hours. Currently at 7:45 am: moderate snow/blowing snow, .75 mi vis, brisk NNE wind, and a steady temp of 27.
4/7/2012 7:00 AM 0.18 2.2 M 1.0 M Daytime snow ended with a heavy graupel shower in the late afternoon.
4/8/2012 7:00 AM 0.00 0.0 M 0.0 M
4/9/2012 7:00 AM 0.00 0.0 M M M
4/10/2012 7:00 AM 0.00 0.0 M M M
4/11/2012 7:00 AM 0.00 0.0 M M M A prescribed burn near Missoula combined with inversion-like conditions to trap smoke throughout the Missoula and Bitterroot Valleys.
4/12/2012 7:00 AM 0.07 M M M M A near-record high of 79 yesterday.
4/13/2012 7:00 AM T 0.0 M 0.0 M
4/14/2012 7:00 AM 0.00 0.0 M 0.0 M
4/15/2012 8:00 AM 0.00 0.0 M 0.0 M
4/16/2012 7:00 AM T 0.0 M 0.0 M
4/17/2012 7:00 AM T 0.0 M 0.0 M
4/18/2012 7:00 AM T 0.0 M 0.0 M
4/19/2012 7:00 AM 0.08 T M T M Snow/graupel shower moved through at 6:30 am this morning, with a temp of 34.
4/20/2012 7:00 AM T T M 0.0 M Trace is from yesterday morning.
4/21/2012 7:00 AM T 0.0 M 0.0 M Trace is from yesterday's sprinkles. Partly to mostly sunny this morning, with a temp of 41.
4/22/2012 7:00 AM 0.00 0.0 M 0.0 M
4/23/2012 7:00 AM T 0.0 M 0.0 M Rain shower with gusty winds blew through just before obv time, ending with a rainbow almost directly overhead. An exciting beginning to what should be an active weather week.
4/24/2012 7:00 AM T 0.0 M M M
4/25/2012 7:00 AM 0.02 0.0 M 0.0 M
4/26/2012 7:00 AM 0.15 0.0 M 0.0 M First batch of rain moved through around midnight. Second batch started at 6:30 am, and continues with light to moderate rain, calm wind, and a current temp of 46.
4/27/2012 7:00 AM 0.23 T M 0.0 M Two-day liquid precip total of .38", with light flurries this morning and a current temp of 35.
4/28/2012 8:00 AM T T M 0.0 M
4/29/2012 7:00 AM 0.00 0.0 M M M
4/30/2012 7:00 AM 0.00 0.0 M M M
5/1/2012 7:00 AM 0.15 0.0 M M M Total precip for April was below normal: .81" actual vs 1.22" average. This included 2.7" of snow.
5/2/2012 7:00 AM T T M 0.0 M Four months into 2012, YTD precip was normal: 3.62" actual vs 3.77 average. Favorable La Nina conditions were offset by persistent downsloping conditions.
5/3/2012 7:00 AM T T M 0.0 M
5/4/2012 7:00 AM 0.03 T M 0.0 M
5/5/2012 7:00 AM 0.30 T M 0.0 M Light flurries at obv time, making this the fourth straight day of May with snow observed. Note: the .30" liquid precip is exact.
5/6/2012 7:00 AM T T M 0.0 M
5/7/2012 6:30 AM 0.00 0.0 M 0.0 M
5/8/2012 7:00 AM 0.00 0.0 M 0.0 M
5/9/2012 7:00 AM 0.00 0.0 M 0.0 M
5/10/2012 7:00 AM 0.00 0.0 M M M Anticipated temps in the mid-twenties tonight could pose a problem for fruit trees in bloom, as well as other tender plants.
5/11/2012 7:00 AM 0.00 0.0 M M M A low of 27 this morning.
5/12/2012 7:00 AM 0.00 0.0 M M M The apple blossoms at the middle and lower valley locations were brown and wilted as a result of Thursday night's temps in the 25-27 range.
5/13/2012 8:00 AM 0.00 0.0 M M M
5/14/2012 6:00 AM 0.00 0.0 M 0.0 M
5/15/2012 6:00 AM 0.00 0.0 M M M
5/16/2012 7:00 AM 0.00 0.0 M M M
5/17/2012 7:00 AM 0.00 0.0 M M M
5/18/2012 7:00 AM 0.01 0.0 M M M It was the first measurable rain in 12 days, but at 0.01", it hardly amounted to much.
5/19/2012 7:00 AM 0.00 0.0 M M M
5/20/2012 8:00 AM 0.00 0.0 M M M
5/21/2012 7:00 AM 0.00 0.0 M M M Today is my 5th anniversary as a CoCoRaHS observer, with 1759 observations covering the five-year period.
5/22/2012 7:00 AM 0.21 0.0 M M M Some much needed rain!
5/23/2012 7:00 AM 0.03 0.0 M M M
5/24/2012 7:00 AM T T M 0.0 M Graupel shower in the early afternoon.
5/25/2012 7:00 AM T 0.0 M M M
5/26/2012 7:00 AM 0.01 0.0 M 0.0 M
5/27/2012 8:30 AM 0.30 T M 0.0 M Rain/snow mix this morning, with a temp of 34. The .30" liquid measurement is exact.
5/28/2012 7:00 AM 0.09 T M 0.0 M
5/29/2012 6:00 AM T T M M M Cool temps and passing sprinkles made for a good day on the wood crew.
5/30/2012 7:00 AM 0.05 0.0 M M M
5/31/2012 6:00 AM 0.00 0.0 M M M Total Precip for May was somewhat below normal: 1.18" actual vs 1.92" average.
6/4/2012 7:00 AM T 0.0 M M M
6/5/2012 7:00 AM 0.13 0.0 M M M Nickel-sized hail was observed and reported at 3:30 pm. Duration was only four minutes, and damage was minimal.
6/6/2012 7:00 AM 0.76 0.0 M M M T-storm with 3/8" hail at the start of the .76" rain event.
6/7/2012 7:00 AM 0.00 0.0 M M M
6/8/2012 7:00 AM 0.04 0.0 M M M
6/9/2012 8:00 AM 0.19 0.0 M M M A brief but heavy shower in the late afternoon contained some small hail as well.
6/10/2012 8:00 AM 0.01 0.0 M M M
6/11/2012 7:00 AM 0.02 0.0 M M M
6/12/2012 6:30 AM 0.00 0.0 M M M
6/13/2012 7:00 AM 0.50 0.0 M M M Thunder cell with rain, wind and a few c-t-g lightning strikes rumbled through after 7 pm. This was followed by a second wave of rain overnight. The total precip amount of .50" is exact.
6/14/2012 6:30 AM T 0.0 M M M
6/15/2012 7:00 AM 0.00 0.0 M M M
6/16/2012 7:00 AM 0.00 0.0 M M M
6/17/2012 7:00 AM 0.02 0.0 M M M Brief shower moved through at 5 a.m.
6/18/2012 7:00 AM T 0.0 M M M
6/19/2012 7:00 AM 0.09 0.0 M M M
6/20/2012 7:00 AM T 0.0 M M M
6/21/2012 7:00 AM 0.00 0.0 M M M
6/25/2012 7:00 AM 0.00 0.0 M M M
6/26/2012 7:00 AM 0.00 0.0 M M M
6/27/2012 7:00 AM 0.01 0.0 M M M
6/28/2012 7:00 AM 0.00 0.0 M M M
6/29/2012 6:00 AM 0.00 0.0 M M M
6/30/2012 7:00 AM 0.00 0.0 M M M Total June precip came in at 1.87", not quite up to the 2.02" June norm, and certainly pale in comparison to the 5-7 inches noted in some locations of NW Montana.
7/1/2012 7:00 AM 0.00 0.0 M M M Six months into 2012, total y-t-d precip for this Bitterroot location is running somewhat below normal: 6.67" actual vs 7.80" average.
7/2/2012 7:00 AM 0.01 M M M M
7/3/2012 6:00 AM 0.00 0.0 M M M
7/4/2012 7:00 AM 0.00 0.0 M M M
7/5/2012 7:00 AM 0.00 0.0 M M M
7/6/2012 7:00 AM 0.00 0.0 M M M There has been only .02" precip in the past 14 days, with native plants such as the lupine beginning to wilt.
7/7/2012 7:00 AM 0.00 0.0 M M M
7/8/2012 7:00 AM 0.00 0.0 M M M Clouds and outflow winds from high-based showers dropped the afternoon temp from 91 to 83, but yielded no rain.
7/9/2012 6:30 AM 0.00 0.0 M M M
7/10/2012 7:00 AM T M M M M Intense outflow winds in the 35-45 mph range knocked out the power for two hours late yesterday afternoon, but only produced a trace of rain.
7/11/2012 7:00 AM 0.07 M M M M First wetting rain in three weeks came with two morning thunder cells, including vivid cloud to ground lightning.
7/12/2012 7:00 AM 0.01 M M M M
7/13/2012 7:00 AM 0.00 0.0 M M M Highest temp of the season yesterday at 95.
7/14/2012 7:00 AM 0.02 M M M M Following previous patterns, it appears that the bulk of the precip has shifted to the north, leaving only .02" for this parched Bitterroot location.
7/15/2012 7:00 AM 0.91 M M M M Most of the .91" of rain fell between 7:50-8:50 pm, with ponding and runoff observed. Strong winds and lightning were also factors.
7/16/2012 7:00 AM T M M M M
7/17/2012 7:00 AM 0.01 M M M M
7/18/2012 6:30 AM 0.06 M M M M
7/19/2012 6:30 AM 0.00 0.0 M M M
7/20/2012 7:00 AM 0.00 0.0 M M M
7/21/2012 7:00 AM T M M M M
7/22/2012 7:00 AM 0.00 0.0 M M M
7/23/2012 7:00 AM 0.00 0.0 M M M
7/24/2012 7:00 AM 0.00 0.0 M M M
7/25/2012 7:00 AM 0.00 0.0 M M M
7/26/2012 6:00 AM 0.00 0.0 M M M
7/27/2012 7:00 AM 0.00 0.0 M M M A couple rumbles of thunder and lightning flashes at 5 am, but alas no rain.
7/28/2012 7:00 AM 0.06 M M M M T-cells trained through from mid-afternoon through the evening. Though numerous, the storms were moderate with wind, several c-t-g lightning strikes, and the first measurable precip in nine days at .06".
7/29/2012 6:30 AM 0.00 0.0 M M M
7/30/2012 7:00 AM 0.00 0.0 M M M
7/31/2012 7:00 AM 0.00 0.0 M M M July total precip was above normal: 1.15" actual vs .96" average. The bulk of this rain (.91") fell in one downpour, with the last half of the month seeing only .13" of rain. The ongoing dry heat has increased afternoon smoke and haze over the last two days. Also, yesterday's high of 96 was the warmest of the season thus far.
8/1/2012 7:00 AM 0.00 0.0 M M M
8/2/2012 7:00 AM 0.00 0.0 M M M
8/3/2012 7:00 AM 0.01 M M M M
8/4/2012 7:00 AM 0.00 0.0 M M M
8/5/2012 7:00 AM 0.00 0.0 M M M A wildfire burning sw of St. Mary's peak on the Idaho side dumped smoke into the northern Bitterroot yesterday afternoon. Things settled down overnight, with a light haze this morning.
8/6/2012 6:30 AM 0.00 0.0 M M M A noticeable increase in smoke and haze yesterday afternoon, with visibilities generally in the 8-10 mile range.
8/7/2012 6:30 AM 0.00 0.0 M M M
8/8/2012 6:30 AM 0.00 0.0 M M M
8/9/2012 7:00 AM 0.06 M M M M High temp of 100 was quickly eclipsed by a thunder cell, which dropped the temp to 65 and provided .06" rain. Lightning was also observed. Prior to the storm, visibilities lowered to 4-6 miles in smoke and haze.
8/10/2012 7:00 AM 0.00 0.0 M M M
8/11/2012 8:00 AM 0.00 0.0 M M M
8/12/2012 7:00 AM 0.00 0.0 M M M
8/13/2012 7:00 AM 0.00 0.0 M M M Moderate afternoon smoke from nearby wildfires lingered throughout the night, with current visibilities +/- 8 miles.
8/14/2012 7:00 AM 0.00 0.0 M M M Nearby fire activity dropped visibilities to 1-2 miles late yesterday afternoon. Conditions improved overnight, with current vis. at 8-10 miles.
8/15/2012 7:00 AM 0.00 0.0 M M M
8/16/2012 7:00 AM 0.00 0.0 M M M
8/17/2012 7:00 AM 0.00 0.0 M M M
8/18/2012 7:00 AM 0.00 0.0 M M M
8/19/2012 7:00 AM 0.00 0.0 M M M
8/20/2012 7:00 AM 0.00 0.0 M M M Calm conditions have allowed smoke and haze to increase over the Bitterroot, with a current visibility of 6-8 miles.
8/21/2012 7:00 AM T M M M M Observed first precip in 12 days, albeit just a few drops. Visibility from smoke/haze is currently showing slight improvement at 8-10 miles.
8/22/2012 7:00 AM 0.12 M M M M Three thunder cells passed overhead between 3:30-10:30 pm, with lightning sparking a fire SE of Corvallis in the Sapphire foothills. Engines and a helicopter responded, with no new activity observed so far this morning.
8/23/2012 7:00 AM 0.00 0.0 M M M Moderate smoke from nearby wildfires settled into the valley late yesterday and persisted overnight, with current visibilities ranging from 4-6 miles north to 6-8 miles south.
8/24/2012 7:00 AM 0.00 0.0 M M M Visibilities decreased to 1-3 miles late yesterday, with unhealthy air for the 8-24 hr cumulative period reported at the nearby Hamilton air quality monitoring station. Conditions have improved slightly this morning to 4-6 miles visibility.
8/25/2012 7:00 AM 0.00 0.0 M M M Breezy winds yesterday lifted the smoke, with only hazy conditions and a visibility of +/- 10 miles lingering into this morning.
8/26/2012 7:00 AM 0.00 0.0 M M M
8/27/2012 7:00 AM 0.00 0.0 M M M Trapped valley smoke in calm conditions dropped visibilities to 1-2 miles late yesterday, with air quality deteriorating to unhealthy for all groups at the nearby Hamilton air quality monitoring station. Conditions have improved this morning to 8-10 miles visibility.
8/28/2012 7:00 AM T M M M M High-based thunder cells moved NNE over the Bitterroot and Sapphire mountains in the late afternoon, producing strong outflow winds and a trace of rain.
8/29/2012 7:00 AM 0.00 0.0 M M M Currently: Visibility 1 mile in dense smoke, with a light accumulation of ash.
8/30/2012 7:00 AM 0.00 0.0 M M M Smoke and haze continued yesterday into this morning, with varible visibilities and air quality.
8/31/2012 7:00 AM 0.00 0.0 M M M Total August precip was just 16% of normal: .19" actual vs 1.15" average.
9/1/2012 7:00 AM 0.00 0.0 M M M Smoke and haze, with a visibility of 4-6 miles.
9/2/2012 7:00 AM 0.00 0.0 M M M Currently: smoke and haze, with 6-8 mile visibility.
9/3/2012 7:00 AM 0.00 0.0 M M M Smoke conditions worsened late yesterday to 1-2 miles visibility as mixing winds stirred nearby wildland fires. Some improvement to 6-8 miles this a.m.
9/4/2012 7:00 AM 0.00 0.0 M M M
9/5/2012 7:00 AM 0.00 0.0 M M M
9/6/2012 7:00 AM 0.00 0.0 M M M Fropa at 6 am with a brief period of gusty winds and rising visibilities.
9/7/2012 7:00 AM 0.00 0.0 M M M
9/8/2012 7:00 AM 0.00 0.0 M M M Now entering the 18th straight day without measurable precip. Even the native sage brush, with its deep tap root, is wilting and drooping.
9/9/2012 7:00 AM 0.00 0.0 M M M Smoke and haze, with 2-4 mile visibilities, last night to present.
9/10/2012 7:00 AM 0.00 0.0 M M M Yesterday's strong winds pushed the Sawtooth Fire south and east and closer to Hamilton. Stage I evacuation notices were issued to the west of town, and cumulative air quality declined to very unhealthy. No rain was observed.
9/11/2012 7:00 AM 0.00 0.0 M M M The Sawtooth Fire burning west of Hamilton doubled in size yesterday to 2600 acres. Heavy smoke and ash were widespead, but no structures were reported lost. The fire was observed burning throughout the night and moving northerly. Visibility at present is 8-10 miles.
9/12/2012 7:00 AM 0.00 0.0 M M M The Sawtooth Fire burning west of Hamilton grew slightly to 4100 acres as fire crews took advantage of easing winds. Currently: 6-8 mile visibility, with a morning low temp of 36.
9/13/2012 7:00 AM 0.00 0.0 M M M The Sawtooth Fire grew slightly yesterday to 4,500 acres. Light winds have allowed valley smoke to build north, with current visibility at 2 miles and DEQ air quality at unhealthy for all groups.
9/14/2012 7:00 AM 0.00 0.0 M M M Heavy smoke inversion over the past 24 hours, with visibilities of .5 to 1.5 miles. DEQ air quality now at hazardous (the highest level) for 24-hour exposure.
9/15/2012 7:00 AM 0.00 0.0 M M M One mile visibility in thick smoke, with very unhealthy to hazardous air quality.
9/16/2012 7:00 AM 0.00 0.0 M M M I attempted to stack firewood yesterday morning, but was forced inside by the smoke after only one hour. That's where I spent the rest of the day with the windows shut. Nasty stuff.
9/17/2012 7:00 AM 0.00 0.0 M M M
9/18/2012 7:00 AM 0.00 0.0 M M M Now into the 28th straight day of no measurable precip at this location.
9/19/2012 7:00 AM 0.00 0.0 M M M Heavy smoke returned yesterday and continues into this morning, with 1-2 mile visibility and unhealthy air quality. All windows and doors are shut, providing some relief from the noxious air.
9/20/2012 7:00 AM 0.00 0.0 M M M This morning begins the 30th consecutive day without mesurable precipitation, nearing an all-time record for the region.
9/21/2012 7:00 AM 0.00 0.0 M M M
9/22/2012 8:00 AM 0.00 0.0 M M M
9/23/2012 7:00 AM 0.00 0.0 M M M
9/24/2012 7:00 AM 0.00 0.0 M M M No rain, but plenty of smoke, with a current visibility of 1 mile and unhealthy (one-hour) air quality.
9/25/2012 7:00 AM 0.00 0.0 M M M Thick smoke, with 1 mile vis and unhealthy air, has led to the doors and windows being shuttered yet again.
9/26/2012 7:00 AM 0.00 0.0 M M M A late afternoon north breeze was enough to mix out some of the noxious smoke, with visibility currently at 6-8 miles, and a 'unhealthy for sensitive groups' air quality reading.
9/27/2012 7:00 AM 0.00 0.0 M M M The last measurable rain occurred on Aug 21 (reported in Aug 22 report), meaning that it has been 36 consecutive days without measurable rain. This ties a 1967 record, and is just three days short of the 1969 record, which was the longest duration in 62 years of record keeping by the NWS/Missoula.
9/28/2012 7:00 AM 0.00 0.0 M M M
9/29/2012 7:00 AM 0.00 0.0 M M M This station's 39th consecutive day without measurable precip ties the standing record set in 1969 at nearby Missoula NWS based on records dating back to 1948.
9/30/2012 7:00 AM 0.00 0.0 M M M Forty days and forty nights, with only a trace of rain. Making this the longest period of consecutive days without measurable precip in 64 years of record keeping.



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
6/1/2012 6/03/2012 7:00 AM 3 0.10 0.0 0.00
6/22/2012 6/24/2012 6:00 AM 3 0.00 0.0 0.00



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
6/4/2012 3:25 PM 7/8" Nickel Size 3/4" Penny Size 1/4" Pea Size Mixed|White Ice 4 1min minor leaf damage Continuous True After rain After smaller hail
6/5/2012 3:58 PM Hail fell from a mild t-storm, with a few rumbles of thunder and one cloud-to-ground lightning strike observed over the Bitterroot Mtns. (Note: report edited to reflect correct time of 3:58 pm.) 3/8" 1/4" Pea Size Rice White Ice 3 no damage True After rain After smaller hail
6/8/2012 5:39 PM Heavy downpour yielded .19" in twenty minutes. No thunder/lightning observed. 1/4" Pea Size Rice Rice Mixed 5 no damage True After rain Same time as smaller hail