Station Overview Station Location
Station Number CO-AM-10 Latitude 37.65175
Station Name Great Sand Dunes 7.0 SSW Longitude -105.57938
County Alamosa Elevation (ft) 7890



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 09 0.83 0.85 31 0.85 25 0.00 6 1 9 1 6.9 2 2
Nov 09 0.39 0.05 30 0.05 30 0.00 0 0 2 0 0.0 0 0
Dec 09 0.34 0.22 31 0.22 31 0.00 0 0 5 3 1.7 4 18
Jan 10 0.37 0.28 31 0.28 31 0.00 0 0 4 3 1.4 4 6
Feb 10 0.37 0.33 28 0.17 17 0.16 11 1 4 5 1.2 3 8
March 10 0.79 1.06 32 1.06 24 0.00 8 1 7 2 12.0 3 3
April 10 0.97 1.90 30 1.90 30 0.00 0 0 5 3 5.5 1 2
May 10 0.97 0.26 31 0.26 31 0.00 0 0 4 1 0.0 0 0
June 10 1.17 0.42 30 0.42 30 0.00 0 0 5 2 0.0 0 0
July 10 1.45 2.06 31 2.06 31 0.00 0 0 7 3 0.0 0 0
Aug 10 1.94 1.55 31 1.55 31 0.00 0 0 14 1 0.0 0 0
Sept 10 1.50 1.29 30 1.15 25 0.14 5 1 2 0 0.0 0 0
Water Year Totals: 11.09" 10.27" 366 days 9.97" 336 0.30" 30 days 4 68 days 24 days 28.7" 17 days 39 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
10/1/2009 **
10/2/2009 **
10/3/2009 **
10/4/2009 **
10/5/2009 **
10/6/2009 0.00
10/7/2009 0.03
10/8/2009 0.06
10/9/2009 0.12
10/10/2009 0.00
10/11/2009 0.00
10/12/2009 0.00
10/13/2009 0.00
10/14/2009 0.24
10/15/2009 0.00
10/16/2009 0.00
10/17/2009 0.00
10/18/2009 0.00
10/19/2009 0.00
10/20/2009 0.00
10/21/2009 0.02
10/22/2009 0.04
10/23/2009 0.00
10/24/2009 0.00
10/25/2009 0.00
10/26/2009 0.02
10/27/2009 0.00
10/28/2009 T
10/29/2009 0.21
10/30/2009 0.11
10/31/2009 0.00
11/1/2009 0.00
11/2/2009 0.00
11/3/2009 0.00
11/4/2009 0.00
11/5/2009 0.00
11/6/2009 0.00
11/7/2009 0.00
11/8/2009 0.00
11/9/2009 0.00
11/10/2009 0.00
11/11/2009 0.00
11/12/2009 0.00
11/13/2009 0.00
11/14/2009 0.00
11/15/2009 0.01
11/16/2009 0.04
11/17/2009 0.00
11/18/2009 0.00
11/19/2009 0.00
11/20/2009 0.00
11/21/2009 0.00
11/22/2009 0.00
11/23/2009 0.00
11/24/2009 0.00
11/25/2009 0.00
11/26/2009 0.00
11/27/2009 0.00
11/28/2009 0.00
11/29/2009 0.00
11/30/2009 0.00
12/1/2009 0.00
12/2/2009 0.00
12/3/2009 T
12/4/2009 0.00
12/5/2009 0.00
12/6/2009 0.00
12/7/2009 0.00
12/8/2009 0.07
12/9/2009 0.03
12/10/2009 0.00
12/11/2009 0.00
12/12/2009 0.00
12/13/2009 0.00
12/14/2009 0.03
12/15/2009 0.00
12/16/2009 0.00
12/17/2009 0.00
12/18/2009 0.00
12/19/2009 0.00
12/20/2009 0.00
12/21/2009 0.00
12/22/2009 0.00
12/23/2009 0.06
12/24/2009 0.03
12/25/2009 0.00
12/26/2009 0.00
12/27/2009 0.00
12/28/2009 0.00
12/29/2009 0.00
12/30/2009 T
12/31/2009 T
Day of YearDaily PrcpMultiday Prcp
1/1/2010 0.00
1/2/2010 0.00
1/3/2010 0.00
1/4/2010 0.00
1/5/2010 0.00
1/6/2010 0.00
1/7/2010 0.00
1/8/2010 0.00
1/9/2010 0.00
1/10/2010 0.00
1/11/2010 0.00
1/12/2010 0.00
1/13/2010 0.00
1/14/2010 0.00
1/15/2010 0.00
1/16/2010 0.00
1/17/2010 0.00
1/18/2010 0.00
1/19/2010 0.00
1/20/2010 0.04
1/21/2010 T
1/22/2010 0.15
1/23/2010 0.03
1/24/2010 0.00
1/25/2010 0.00
1/26/2010 0.00
1/27/2010 0.00
1/28/2010 T
1/29/2010 0.06
1/30/2010 0.00
1/31/2010 T
2/1/2010 **
2/2/2010 **
2/3/2010 **
2/4/2010 **
2/5/2010 **
2/6/2010 **
2/7/2010 **
2/8/2010 **
2/9/2010 **
2/10/2010 **
2/11/2010 0.16
2/12/2010 0.00
2/13/2010 0.00
2/14/2010 0.00
2/15/2010 0.00
2/16/2010 T
2/17/2010 T
2/18/2010 0.00
2/19/2010 0.08
2/20/2010 T
2/21/2010 T
2/22/2010 T
2/23/2010 0.03
2/24/2010 0.00
2/25/2010 0.05
2/26/2010 0.01
2/27/2010 0.00
2/28/2010 0.00
3/1/2010 T
3/2/2010 T
3/3/2010 0.00
3/4/2010 0.00
3/5/2010 0.00
3/6/2010 0.00
3/7/2010 0.00
3/8/2010 0.13
3/9/2010 0.33
3/10/2010 0.00
3/11/2010 0.27
3/12/2010 0.00
3/13/2010 0.00
3/14/2010 0.00
3/15/2010 0.02 **
3/16/2010 **
3/17/2010 **
3/18/2010 **
3/19/2010 **
3/20/2010 **
3/21/2010 **
3/22/2010 0.00
3/23/2010 0.00
3/24/2010 0.11
3/25/2010 0.02
3/26/2010 0.00
3/27/2010 0.18
3/28/2010 0.00
3/29/2010 0.00
3/30/2010 0.00
3/31/2010 0.00
Day of YearDaily PrcpMultiday Prcp
4/1/2010 0.00
4/2/2010 0.00
4/3/2010 T
4/4/2010 0.00
4/5/2010 0.00
4/6/2010 0.00
4/7/2010 0.00
4/8/2010 0.00
4/9/2010 0.00
4/10/2010 0.00
4/11/2010 0.00
4/12/2010 0.00
4/13/2010 T
4/14/2010 0.00
4/15/2010 0.00
4/16/2010 0.00
4/17/2010 0.42
4/18/2010 0.12
4/19/2010 T
4/20/2010 0.00
4/21/2010 0.00
4/22/2010 0.22
4/23/2010 0.92
4/24/2010 0.22
4/25/2010 0.00
4/26/2010 0.00
4/27/2010 0.00
4/28/2010 0.00
4/29/2010 0.00
4/30/2010 0.00
5/1/2010 0.01
5/2/2010 0.04
5/3/2010 0.00
5/4/2010 0.00
5/5/2010 0.00
5/6/2010 0.00
5/7/2010 0.00
5/8/2010 0.00
5/9/2010 0.00
5/10/2010 0.00
5/11/2010 0.00
5/12/2010 0.00
5/13/2010 0.00
5/14/2010 0.00
5/15/2010 0.00
5/16/2010 0.00
5/17/2010 0.00
5/18/2010 0.00
5/19/2010 0.05
5/20/2010 0.16
5/21/2010 0.00
5/22/2010 0.00
5/23/2010 0.00
5/24/2010 0.00
5/25/2010 0.00
5/26/2010 0.00
5/27/2010 0.00
5/28/2010 0.00
5/29/2010 T
5/30/2010 0.00
5/31/2010 0.00
6/1/2010 0.00
6/2/2010 0.00
6/3/2010 0.00
6/4/2010 0.00
6/5/2010 0.00
6/6/2010 0.04
6/7/2010 0.07
6/8/2010 0.00
6/9/2010 0.00
6/10/2010 0.00
6/11/2010 0.00
6/12/2010 0.00
6/13/2010 T
6/14/2010 0.00
6/15/2010 0.00
6/16/2010 0.00
6/17/2010 0.00
6/18/2010 0.00
6/19/2010 0.00
6/20/2010 0.00
6/21/2010 0.00
6/22/2010 0.00
6/23/2010 0.00
6/24/2010 0.00
6/25/2010 0.00
6/26/2010 T
6/27/2010 0.00
6/28/2010 0.02
6/29/2010 0.28
6/30/2010 0.01
Day of YearDaily PrcpMultiday Prcp
7/1/2010 0.00
7/2/2010 0.00
7/3/2010 0.10
7/4/2010 0.00
7/5/2010 0.00
7/6/2010 0.00
7/7/2010 0.00
7/8/2010 T
7/9/2010 0.03
7/10/2010 0.00
7/11/2010 T
7/12/2010 T
7/13/2010 0.00
7/14/2010 0.00
7/15/2010 0.00
7/16/2010 0.00
7/17/2010 0.00
7/18/2010 0.00
7/19/2010 0.00
7/20/2010 0.00
7/21/2010 1.12
7/22/2010 0.00
7/23/2010 0.02
7/24/2010 0.22
7/25/2010 0.00
7/26/2010 0.00
7/27/2010 0.00
7/28/2010 0.00
7/29/2010 0.00
7/30/2010 0.07
7/31/2010 0.50
8/1/2010 0.20
8/2/2010 0.00
8/3/2010 0.39
8/4/2010 0.00
8/5/2010 0.26
8/6/2010 0.02
8/7/2010 0.00
8/8/2010 0.07
8/9/2010 0.05
8/10/2010 0.05
8/11/2010 0.00
8/12/2010 0.00
8/13/2010 0.00
8/14/2010 0.00
8/15/2010 0.00
8/16/2010 0.00
8/17/2010 0.06
8/18/2010 0.00
8/19/2010 0.01
8/20/2010 0.06
8/21/2010 0.00
8/22/2010 0.00
8/23/2010 0.04
8/24/2010 0.24
8/25/2010 0.00
8/26/2010 0.00
8/27/2010 0.00
8/28/2010 0.00
8/29/2010 0.01
8/30/2010 0.09
8/31/2010 T
9/1/2010 0.00
9/2/2010 0.00
9/3/2010 0.00
9/4/2010 0.00
9/5/2010 0.00
9/6/2010 0.00
9/7/2010 0.00
9/8/2010 0.03
9/9/2010 0.00
9/10/2010 0.00
9/11/2010 0.00
9/12/2010 0.00
9/13/2010 0.00
9/14/2010 0.00
9/15/2010 0.00
9/16/2010 **
9/17/2010 **
9/18/2010 **
9/19/2010 **
9/20/2010 0.14
9/21/2010 0.00
9/22/2010 0.00
9/23/2010 1.12
9/24/2010 0.00
9/25/2010 0.00
9/26/2010 0.00
9/27/2010 0.00
9/28/2010 0.00
9/29/2010 0.00
9/30/2010 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/7/2009 7:00 AM 0.03 M M M M Overnight precip. Overcast. Looks like more rain coming.
10/8/2009 7:00 AM 0.06 M M M M Various rain showers throughout day & overnight. Foggy.
10/9/2009 7:00 AM 0.12 M M M M Various rain showers throughout day. Included some sleet. Clear sky this morning.
10/10/2009 7:00 AM 0.00 0.0 M M M
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 7:00 AM 0.24 M M M M
10/15/2009 7:00 AM 0.00 0.0 M M M
10/16/2009 7:00 AM 0.00 0.0 M M M
10/17/2009 7:00 AM 0.00 0.0 M M M
10/18/2009 7:00 AM 0.00 0.0 M M M
10/19/2009 7:00 AM 0.00 0.0 M M M Red sky in the morning....
10/20/2009 7:00 AM 0.00 0.0 M M M
10/21/2009 7:00 AM 0.02 M M M M Not currently raining, but with heavy overcast, too dark to see what's happening.
10/22/2009 7:00 AM 0.04 0.0 M 0.0 M Surprisingly little precip (snow & rain) as compared to surrounding areas.
10/23/2009 7:00 AM 0.00 0.0 M M M
10/24/2009 7:00 AM 0.00 0.0 M M M
10/25/2009 7:00 AM 0.00 0.0 M M M
10/26/2009 7:00 AM 0.02 M M M M Frozen in the bottom of the 4" tube. Spitting grapple about 10:30 am.
10/27/2009 7:00 AM 0.00 0.0 M M M
10/28/2009 7:00 AM T M M M M
10/29/2009 7:00 AM 0.21 4.0 M 4.0 M
10/30/2009 7:00 AM 0.11 2.9 M 3.9 M Trace of snow during day. Snow overnight.
10/31/2009 7:00 AM 0.00 0.0 M M M
11/1/2009 7:00 AM 0.00 0.0 M T M
11/2/2009 7:00 AM 0.00 0.0 M T M
11/3/2009 7:00 AM 0.00 0.0 M 0.0 M
11/4/2009 7:00 AM 0.00 0.0 M M M
11/5/2009 7:00 AM 0.00 0.0 M M M
11/6/2009 7:00 AM 0.00 0.0 M M M
11/7/2009 7:00 AM 0.00 0.0 M M M
11/8/2009 7:00 AM 0.00 0.0 M M M
11/9/2009 7:00 AM 0.00 0.0 M M M
11/10/2009 7:00 AM 0.00 0.0 M M M
11/11/2009 7:00 AM 0.00 0.0 M M M
11/12/2009 7:00 AM 0.00 0.0 M M M
11/13/2009 7:00 AM 0.00 0.0 M M M
11/14/2009 7:00 AM 0.00 0.0 M M M
11/15/2009 7:00 AM 0.01 T M T M Powdered sugar snow falling at dawn. Skiff on ground.
11/16/2009 7:00 AM 0.04 T M T M Skiff of fresh snow overnight.
11/17/2009 7:00 AM 0.00 0.0 M T M
11/18/2009 7:00 AM 0.00 0.0 M T M
11/19/2009 7:00 AM 0.00 0.0 M 0.0 M
11/20/2009 7:00 AM 0.00 0.0 M M M
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 7:00 AM 0.00 0.0 M M M
11/25/2009 7:00 AM 0.00 0.0 M M M
11/26/2009 7:00 AM 0.00 0.0 M M M
11/27/2009 7:00 AM 0.00 0.0 M M M
11/28/2009 7:00 AM 0.00 0.0 M M M
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 7:00 AM 0.00 0.0 M M M
12/2/2009 7:00 AM 0.00 0.0 M M M
12/3/2009 7:00 AM T T M M M A trace of grapple snow fell just prior to dark.
12/4/2009 7:00 AM 0.00 0.0 M M M
12/5/2009 7:00 AM 0.00 0.0 M M M
12/6/2009 7:00 AM 0.00 0.0 M M M
12/7/2009 7:00 AM 0.00 0.0 M M M
12/8/2009 7:00 AM 0.07 T M T M High winds overnight. Snow accumulation drifted and blown away in open areas.
12/9/2009 7:00 AM 0.03 0.5 M 0.5 M
12/10/2009 7:00 AM 0.00 0.0 M 0.5 M
12/11/2009 7:00 AM 0.00 0.0 M 0.5 M -11F at 7a.
12/12/2009 7:00 AM 0.00 0.0 M M M
12/13/2009 7:00 AM 0.00 0.0 M 0.5 M 20F Windy. First time above zero at 7 in weeks!
12/14/2009 7:00 AM 0.03 0.2 M 0.5 M Terribly windy all day. Snow fell during one squall in late afternoon. Accumulation difficult to measure due to wind/drifting.
12/15/2009 7:00 AM 0.00 0.0 M 0.5 M -10F
12/16/2009 7:00 AM 0.00 0.0 M 0.5 M
12/17/2009 7:00 AM 0.00 0.0 M 0.5 M
12/18/2009 7:00 AM 0.00 0.0 M 0.5 M
12/19/2009 7:00 AM 0.00 0.0 M T M
12/20/2009 7:00 AM 0.00 0.0 M M M
12/21/2009 7:00 AM 0.00 0.0 M T M
12/22/2009 7:00 AM 0.00 0.0 M T M
12/23/2009 7:00 AM 0.06 0.5 M 0.5 M Fine granular "sugar" snow falling at 7a. Snowing at first light.
12/24/2009 7:00 AM 0.03 0.5 M 0.5 M Snowing "sugar snow" at 7a yesterday. Cleared later in the morning. Fresh fluffy snow overnight.
12/25/2009 7:00 AM 0.00 0.0 M 0.5 M
12/26/2009 7:00 AM 0.00 0.0 M 0.5 M -12F Brrr.
12/27/2009 7:00 AM 0.00 0.0 M 0.5 M -17F at 7a.
12/28/2009 7:00 AM 0.00 0.0 M 0.5 M -21F Clear
12/29/2009 7:00 AM 0.00 0.0 M 0.5 M 7F That's Better! Still cold with very little melting or sublimation. Not much snow, but hard to find bare ground.
12/30/2009 7:00 AM T T M 0.5 M Overcast 7F.
12/31/2009 7:00 AM T T M 0.5 M Skiff of Snow overnight. 2F. Fantastic orange blue moon setting at 7a.
1/1/2010 7:00 AM 0.00 0.0 M 0.5 M Happy New Decade! -6F.
1/2/2010 7:00 AM 0.00 0.0 M 0.5 M 4F overcast
1/3/2010 7:00 AM 0.00 0.0 M T M
1/4/2010 7:00 AM 0.00 0.0 M T M Clear 0F
1/5/2010 7:00 AM 0.00 0.0 M T M -2F
1/6/2010 7:00 AM 0.00 0.0 M T M 14F overcast
1/7/2010 7:00 AM 0.00 0.0 M T M 6F
1/8/2010 7:00 AM 0.00 0.0 M T M -9F
1/9/2010 7:00 AM 0.00 0.0 M T M -10 some high cirrus
1/10/2010 7:00 AM 0.00 0.0 M T M -4F clear
1/11/2010 7:00 AM 0.00 0.0 M M M
1/12/2010 7:00 AM 0.00 0.0 M T M -8F
1/13/2010 7:00 AM 0.00 0.0 M T M 0F scattered high clouds
1/14/2010 7:00 AM 0.00 0.0 M T M 12F Heat Wave!
1/15/2010 7:00 AM 0.00 0.0 M T M 4F
1/16/2010 7:00 AM 0.00 0.0 M T M
1/17/2010 7:00 AM 0.00 0.0 M T M
1/18/2010 7:00 AM 0.00 0.0 M T M 4F
1/19/2010 7:00 AM 0.00 0.0 M T M 20F Heat wave!
1/20/2010 7:00 AM 0.04 0.5 M 5.0 M A few minutes of winter!
1/21/2010 7:00 AM T 0.0 M T M
1/22/2010 7:00 AM 0.15 0.5 M 0.5 M 27F I expected to be melting snow, but the cylinder was full of water!! It's apparently been raining overnight. Much of the snow on the ground from yesterday has melted. The sidewalk is slick (and I'm sure the roads are too).
1/23/2010 7:00 AM 0.03 0.2 M 0.5 M 6F Snow overnight.
1/24/2010 7:00 AM 0.00 0.0 M M M
1/25/2010 7:00 AM 0.00 0.0 M T M 6F
1/26/2010 7:00 AM 0.00 0.0 M T M -6F High cirrus. Clouds over the San Juans.
1/27/2010 7:00 AM 0.00 0.0 M T M -2F
1/28/2010 7:00 AM T T M T M 17F Skiff of snow
1/29/2010 7:00 AM 0.06 0.2 M 0.2 M 16F Sugar Snow
1/30/2010 7:00 AM 0.00 0.0 M T M 10F
1/31/2010 7:00 AM T T M T M 10F
2/12/2010 7:00 AM 0.00 0.0 M 1.5 M This was as of 6:pm to 7:am. See multi-day report. Nice to get away from cold country for almost a week! Came back to frozen pipes in well house. (Space heater for a few hours overnight fixed it - no damage.)
2/13/2010 7:00 AM 0.00 0.0 M 0.5 M
2/14/2010 7:00 AM 0.00 0.0 M 0.5 M Snow is gone in sunny areas. Up to 2" in shade.
2/15/2010 7:00 AM 0.00 0.0 M 0.5 M -5F High Cirrus
2/16/2010 7:00 AM T T M 0.5 M 10F Overcast w/ Angels Dandruff Falling - a few flakes visible on clean surfaces.
2/17/2010 7:00 AM T 0.0 M 0.5 M 3F High Cirrus
2/18/2010 7:00 AM 0.00 0.0 M T M
2/19/2010 7:00 AM 0.08 0.5 M 0.5 M 12F Mostly cloudy. Fog.
2/20/2010 7:00 AM T T M T M 22F Skiff of snow overnight
2/21/2010 7:00 AM T T M T M 19F Slight skiff of snow overnight.
2/22/2010 7:00 AM T T M T M 16F Overcast - Just started snowing
2/23/2010 7:00 AM 0.03 0.3 M T M -10F Clear. Fine, powdered sugar snow fell off and on throughout the day. Little accumulation.
2/24/2010 7:00 AM 0.00 0.0 M T M 0F Overcast
2/25/2010 7:00 AM 0.05 0.4 M 0.5 M 15F Powdered sugar snow.
2/26/2010 7:00 AM 0.01 T M T M 10F Cloudy over Sangres, clearing to west. Skiff of snow overnight.
2/27/2010 7:00 AM 0.00 0.0 M T M 3F Overcast
2/28/2010 7:00 AM 0.00 0.0 M T M 10F overcast
3/1/2010 7:00 AM T 0.0 M T M 23F Mostly cloudy. Powdered sugar snow yesterday morning - no accumulation. (Upslope snow carried over the Sangres.)
3/2/2010 7:00 AM T 0.0 M T M 9F Occasional snow flurries throughout the day.
3/3/2010 7:00 AM 0.00 0.0 M T M 9F Clear
3/4/2010 7:00 AM 0.00 0.0 M T M 10F clear
3/5/2010 7:00 AM 0.00 0.0 M T M 18F clear
3/6/2010 7:00 AM 0.00 0.0 M T M 10F
3/7/2010 7:00 AM 0.00 0.0 M T M 9F clear
3/8/2010 7:00 AM 0.13 T M T M 26f Skiff of snow overnight.
3/9/2010 7:00 AM 0.33 3.0 M 3.0 M 12F clear
3/10/2010 7:00 AM 0.00 0.0 M T M 16F Ptly cloudy
3/11/2010 7:00 AM 0.27 4.5 M 4.5 M 15F Nice wet snow. Flurries throughout day and evening.
3/12/2010 7:00 AM 0.00 0.0 M T M 9F clear
3/13/2010 7:00 AM 0.00 0.0 M T M 10F clear
3/14/2010 7:00 AM 0.00 0.0 M T M 20F
3/15/2010 7:00 AM 0.02 T M T M 11F Near blizzard conditions in pm. Horizontal snow - little accumulation.
3/23/2010 7:00 AM 0.00 0.0 M T M Been gone for a week. Blizzard on 19th-20th didn't leave much accumulation. 0" in gage filed as multi-day.
3/24/2010 7:00 AM 0.11 T M T M 16F High winds & horizontal snow overnight. Snow scoured into drifts up to 1 ft - open areas almost bare. Roads icy.
3/25/2010 7:00 AM 0.02 T M T M 6F Light snow in morning. Overcast most of day.
3/26/2010 7:00 AM 0.00 0.0 M T M 26F overcast breezy
3/27/2010 7:00 AM 0.18 4.5 M 0.5 M 14F overcast calm Snow on ground melting quickly.
3/28/2010 7:00 AM 0.00 0.0 M T M 10F
3/29/2010 7:00 AM 0.00 0.0 M T M
3/30/2010 7:00 AM 0.00 0.0 M T M
3/31/2010 7:00 AM 0.00 0.0 M 0.0 M 32F Record high for Alamosa set yesterday. Snow in shady areas gone.
4/1/2010 7:00 AM 0.00 0.0 M 0.0 M 34F overcast windy
4/2/2010 7:00 AM 0.00 0.0 M 0.0 M 8F clear calm
4/3/2010 7:00 AM T 0.0 M 0.0 M 21F Windy. Snow squall passed through yesterday for several minutes - no accumulation, nothing collected. Would be reporting zero precip if I hadn't been home to observe it.
4/4/2010 7:00 AM 0.00 0.0 M 0.0 M 26F clear, breezy
4/5/2010 7:00 AM 0.00 0.0 M M M 32F Windy. Power out - on UPS.
4/6/2010 7:00 AM 0.00 0.0 M M M 25F High winds yesterday & overnight. Power out most of morning. Windy now.
4/7/2010 7:00 AM 0.00 0.0 M M M 14F Breezy.
4/8/2010 7:00 AM 0.00 0.0 M M M 16F calm
4/9/2010 7:00 AM 0.00 0.0 M M M
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 20F Ptly cldy calm
4/12/2010 7:00 AM 0.00 0.0 M M M 37F overcast light wind
4/13/2010 7:00 AM T M M M M 35F mostly clear, windy.
4/14/2010 7:00 AM 0.00 0.0 M M M 20F clear calm
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 7:00 AM 0.42 M M M M 29F Brief shower about 5:30pm. Soaking rain started overnight.
4/18/2010 7:00 AM 0.12 M M M M 26F clear calm
4/19/2010 7:00 AM T M M M M
4/20/2010 7:00 AM 0.00 0.0 M M M
4/21/2010 7:00 AM 0.00 0.0 M M M
4/22/2010 7:00 AM 0.22 T M T M 30F Raining at 6am changing to snow by 6:30, still snowing at 7a.
4/23/2010 7:00 AM 0.92 5.5 0.72 5.5 M Yesterday snowing at 7am clear & sunny by 8a. New snow started before midnight - still snowing past 7am. Precip total questionable - the result of allowing the piled-up snow on funnel to melt. An open 4" tube may have collected more (or maybe less).
4/24/2010 7:00 AM 0.22 M M 2.5 M 31F Overcast. Snow ended sometime in morning. Unable to measure new snow due to melting during afternoon.
4/25/2010 7:00 AM 0.00 0.0 M T M 22F clear calm. 1" - 2" snow in shady areas. Open areas clear. Friday's snow & weekend cold weather gave irrigators in Blanca/Fort Garland a rare spring weekend off as most ditches including the big supply ditches were shut off (no place to put the water).
4/26/2010 7:00 AM 0.00 0.0 M T M 30F high clouds, breezy
4/27/2010 7:00 AM 0.00 0.0 M 0.0 M 21F clear
4/28/2010 7:00 AM 0.00 0.0 M M M 38F windy
4/29/2010 7:00 AM 0.00 0.0 M M M 32F Windy. Brutally windy yesterday and overnight. Visibility limited.
4/30/2010 7:00 AM 0.00 0.0 M M M 13F clear calm. Another beastly windy day yesterday, calming after sunset. Cooldown to slow snowmelt is OK - but this is too much!
5/1/2010 7:00 AM 0.01 T M T M 16F Granular snow mixed w/wet flakes falling at 8:30. Black dog came in with white back.
5/2/2010 7:00 AM 0.04 T M T M 14F Clear, calm. Snow fell overnight.
5/3/2010 7:00 AM 0.00 0.0 M 0.0 M 16F clear calm
5/4/2010 7:00 AM 0.00 0.0 M M M 26F clear calm
5/5/2010 7:00 AM 0.00 0.0 M M M 26F clear calm
5/6/2010 7:00 AM 0.00 0.0 M M M 38F breezy
5/7/2010 7:00 AM 0.00 0.0 M M M 22F calm
5/8/2010 7:00 AM 0.00 0.0 M M M 26F overcast windy
5/9/2010 7:00 AM 0.00 0.0 M M M 36F clear, calm
5/10/2010 7:00 AM 0.00 0.0 M M M 34F overcast breezy
5/11/2010 7:00 AM 0.00 0.0 M M M 34F clear windy. High winds all day yesterday.
5/12/2010 7:00 AM 0.00 0.0 M M M 16F clear, light breeze
5/13/2010 7:00 AM 0.00 0.0 M M M 23F Partly cloudy, calm.
5/14/2010 7:00 AM 0.00 0.0 M M M 27F mostly overcast, light breeze
5/15/2010 7:00 AM 0.00 0.0 M M M
5/16/2010 7:00 AM 0.00 0.0 M M M 24F clear
5/17/2010 7:00 AM 0.00 0.0 M M M 26F clear
5/18/2010 7:00 AM 0.00 0.0 M M M Wow 42F! Clear, calm.
5/19/2010 7:00 AM 0.05 M M M M 31F Partly cloudy. Rain squall about 1pm.
5/20/2010 7:00 AM 0.16 0.0 M M M 28F clear calm. Didn't check gauge until a few minutes ago - surprise!
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 45F clear windy
5/23/2010 7:00 AM 0.00 0.0 M M M 43F clear windy. High winds all day yesterday. Looks like another.
5/24/2010 7:00 AM 0.00 0.0 M M M 40F clear, windy. Looks like another windy day. The warm winds are stripping the snowpack from the mountains!
5/25/2010 7:00 AM 0.00 0.0 M M M 21F mostly overcast. Another windy day yesterday. Cold front came through about 9am - temps dropped 10 degrees in half hour. Ute Cr dropped 19.9 cfs from yesterday, Sangre de Cristo 10 cfs.
5/26/2010 7:00 AM 0.00 0.0 M M M 26F clear, calm
5/27/2010 7:00 AM 0.00 0.0 M M M 48F Breezy, partly cloudy
5/28/2010 7:00 AM 0.00 0.0 M M M 47F Heat wave! Partly cloudy, breezy
5/29/2010 7:00 AM T M M M M 48F clear, light breeze. Thunder cloud overhead about 5pm - sprinkles.
5/30/2010 7:00 AM 0.00 0.0 M M M 28F clear, calm
5/31/2010 7:00 AM 0.00 0.0 M M M 34F Clear, calm
6/1/2010 7:00 AM 0.00 0.0 M M M 32F clear, calm. Local streams seem to have peaked from snowmelt over the weekend. Snowmelt from Ute and Trinchera drainages should continue strongly for a while, Sangre de Cristo is dropping off steeply. Haven't had any significant moisture for a couple of months. Getting very dry away from irrigated acreage.
6/2/2010 7:00 AM 0.00 0.0 M M M 32F Ptly cldy, calm
6/3/2010 7:00 AM 0.00 0.0 M M M 38F mostly clear, calm
6/4/2010 7:00 AM 0.00 0.0 M M M 44F high stratus, calm
6/5/2010 7:00 AM 0.00 0.0 M M M 52F!!! Mostly clear, calm
6/6/2010 7:00 AM 0.04 M M M M 45F clear, calm. Early evening T-shower mostly on mtn above. Brought S Zapata Cr back down.
6/7/2010 7:00 AM 0.07 M M M M 44F overcast. Calm now - windy overnight.
6/8/2010 7:00 AM 0.00 0.0 M M M 50F Some high cirrus. Calm.
6/9/2010 7:00 AM 0.00 0.0 M M M 44F some high clouds
6/10/2010 7:00 AM 0.00 0.0 M M M
6/11/2010 7:00 AM 0.00 0.0 M M M 52F mostly clear, light breeze.
6/12/2010 7:00 AM 0.00 0.0 M M M 50F mostly cloudy, light breeze.
6/13/2010 7:00 AM T M M M M 38F Ptly cloudy, calm. Strong east winds all day. Spit rain or slushy snow several times during morning and afternoon. No real rain shower.
6/14/2010 7:00 AM 0.00 0.0 M M M 39F ptly cloudy
6/15/2010 7:00 AM 0.00 0.0 M M M 32F Brr! Clear, calm
6/16/2010 7:00 AM 0.00 0.0 M M M 52F light wind, clear
6/17/2010 7:00 AM 0.00 0.0 M M M 47F clear, breezy
6/18/2010 7:00 AM 0.00 0.0 M M M 33F Clear, calm. Sand Dunes Fire blew up yesterday in high winds. Much of the Medano Creek drainage appears to be involved.
6/19/2010 7:00 AM 0.00 0.0 M M M Clear, Calm
6/20/2010 7:00 AM 0.00 0.0 M M M 40F Mostly clear, calm
6/21/2010 7:00 AM 0.00 0.0 M M M 38F clear, calm. Medano fire active in afternoon. Probably over 5000 acres.
6/22/2010 7:00 AM 0.00 0.0 M M M 43F clear, calm
6/23/2010 7:00 AM 0.00 0.0 M M M 36F clear calm
6/24/2010 7:00 AM 0.00 0.0 M M M 50F scattered high clouds. East winds yesterday blew up the Medano Fire at Great Sand Dunes - forced the fire into Horse Canyon. Huge pyro-cumulous cloud with internal tornadic circulation in late afternoon. Cloud looked like a backward 7 from the south - the lower portion blowing to the east, then apparently hitting a west wind and the top moving to the west. Flames towered over ridgetops and fireballs observed at dusk and later. First day since the start of the fire (the 6th) that significant smoke was blown into the San Luis Valley - prevailing west winds had sent the smoke east into Wet Mountain Valley and beyond. I heard that the fire chief in Crestone was receiving many "panic" calls. The wind was blowing the main low-level plume toward Crestone.
6/25/2010 7:00 AM 0.00 0.0 M M M
6/26/2010 7:00 AM T M M M M 48F mostly cloudy. Looks like monsoonal pattern is kicking in. Sprinkle last evening. Not enough to settle the dust.
6/27/2010 7:00 AM 0.00 0.0 M M M
6/28/2010 7:00 AM 0.02 M M M M 40F mostly clear, calm. Late afternoon rainshower formed over mountains.
6/29/2010 7:00 AM 0.28 M M M M 38F Scattered high cirrus, calm. Rain apparently t-storm off mountain between 3 and 5 pm - not observed.
6/30/2010 7:00 AM 0.01 M M M M 40F Clear, calm. Precip from T-shower B4 6pm, not observed.
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 57F Ptly cloudy. breezy, high humidity.
7/3/2010 7:00 AM 0.10 M M M M 50F partly cloudy, calm. Rain overnight.
7/4/2010 7:00 AM 0.00 0.0 M M M 40F Clear calm
7/5/2010 7:00 AM 0.00 0.0 M M M 38F clear calm
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 44F clear calm
7/8/2010 7:00 AM T M M M M 41F Wind driven sprinkles from T-storm to the east over mountain.
7/9/2010 7:00 AM 0.03 M M M M 40F rain overnight
7/10/2010 7:00 AM 0.00 0.0 M M M
7/11/2010 7:00 AM T M M M M 39F Precip was clear sky sprinkles about 4 pm.
7/12/2010 7:00 AM T 0.0 M M M 43F clear, calm. Sprinkles slop over from Ute Creek pm t-storm. Ute Cr up 2.5cfs this morning.
7/13/2010 7:00 AM 0.00 0.0 M M M
7/14/2010 7:00 AM 0.00 0.0 M M M
7/15/2010 7:00 AM 0.00 0.0 M M M
7/16/2010 7:00 AM 0.00 0.0 M M M
7/17/2010 7:00 AM 0.00 0.0 M M M
7/18/2010 7:00 AM 0.00 0.0 M M M
7/19/2010 7:00 AM 0.00 0.0 M M M
7/20/2010 7:00 AM 0.00 0.0 M M M
7/21/2010 7:00 AM 1.12 M M M M Wow! 1.08 in pm t-shower. (Significant Weather Report filed). Another 0.04 overnight.
7/22/2010 7:00 AM 0.00 0.0 M M M
7/23/2010 7:00 AM 0.02 M M M M High clouds, humid, calm. Rain overnight.
7/24/2010 7:00 AM 0.22 M M M M Partly cloudy, calm, humid.
7/25/2010 7:00 AM 0.00 0.0 M M M
7/26/2010 7:00 AM 0.00 0.0 M M M
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
7/30/2010 7:00 AM 0.07 M M M M 50F overcast, calm.
7/31/2010 7:00 AM 0.50 M M M M 56F mostly cloudy. 0.34in from mid-day t-shower, remainder soaking rain from 6pm to midnight. Flash Flooding 2 mi north of this station closed CO150 Highway between GRSA entrance and County Lane 6 for a short time mid-day. Flash floods brought mud and boulders down and across highway more than 1 mile from mouths of the canyons. Hwy only passable by 4WD until DOT got equipment out to remove debris flows from surface of road. Amazing.
8/1/2010 7:00 AM 0.20 M M M M 51F SLV cloud ring. Rain from pm t-showers.
8/2/2010 7:00 AM 0.00 0.0 M M M
8/3/2010 7:00 AM 0.39 M M M M 46F mostly cloudy. The monsoon has definitely kicked in.
8/4/2010 7:00 AM 0.00 0.0 M M M 47F SLV cloud ring.
8/5/2010 7:00 AM 0.26 M M M M 42F Clear
8/6/2010 7:00 AM 0.02 M M M M 45F partly cloudy. Mid afternoon shower yesterday.
8/7/2010 7:00 AM 0.00 0.0 M M M
8/8/2010 7:00 AM 0.07 M M M M
8/9/2010 7:00 AM 0.05 M M M M 50F mostly cloudy
8/10/2010 7:00 AM 0.05 M M M M 41F Mostly clear
8/11/2010 7:00 AM 0.00 0.0 M M M
8/12/2010 7:00 AM 0.00 0.0 M M M
8/13/2010 7:00 AM 0.00 0.0 M M M
8/14/2010 7:00 AM 0.00 0.0 M M M 37F clear calm
8/15/2010 7:00 AM 0.00 0.0 M M M
8/16/2010 7:00 AM 0.00 0.0 M M M
8/17/2010 7:00 AM 0.06 M M M M 39F clear, calm
8/18/2010 7:00 AM 0.00 0.0 M M M
8/19/2010 7:00 AM 0.01 M M M M 54F Overcast, breezy. Rained just long enough to get me up to close windows on truck.
8/20/2010 7:00 AM 0.06 M M M M 40F clear, calm. Rain overnight
8/21/2010 7:00 AM 0.00 0.0 M M M
8/22/2010 7:00 AM 0.00 0.0 M M M
8/23/2010 7:00 AM 0.04 M M M M
8/24/2010 7:00 AM 0.24 M M M M
8/25/2010 7:00 AM 0.00 0.0 M M M
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 0.01 M M M M
8/30/2010 7:00 AM 0.09 M M M M 45F Gentle rain much of the night. Started at 2am. Clearing - should quit soon.
8/31/2010 7:00 AM T M M M M 41F Yesterday morning's rain ended shortly after 7am as sky cleared.
9/1/2010 7:00 AM 0.00 0.0 M M M 33F Fall is falling. So are the creeks.
9/2/2010 7:00 AM 0.00 0.0 M M M
9/3/2010 7:00 AM 0.00 0.0 M M M
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 0.03 M 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 28F!
9/12/2010 7:00 AM 0.00 0.0 M M M
9/13/2010 7:00 AM 0.00 0.0 M M M
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
9/21/2010 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 7:00 AM 1.12 M M M M 42F. Record rainfall for this station. Trace shortly after 7 am, then rain moved in about 1pm. Fresh snow on California Peak east of station.
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 7:00 AM 0.00 0.0 M M M
9/28/2010 7:00 AM 0.00 0.0 M M M
9/29/2010 7:00 AM 0.00 0.0 M M M
9/30/2010 7:00 AM 0.00 0.0 M M M



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
10/1/2009 10/06/2009 3:30 PM 6 0.00 M M
2/1/2010 2/11/2010 6:00 PM 11 0.16 1.5 M Missed the storm. Generally shaded areas have 1.5 - 2 inches of snow, sunny areas have less. 4inch tube had frozen water in bottom, snow accumulation had melted. No clue as to amount of evap.
3/15/2010 3/22/2010 3:30 PM 8 0.00 T M Blizzard conditions on 19th-20th, but very little accumulation.
9/16/2010 9/20/2010 4:00 PM 5 0.14 M M



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