Station Overview Station Location
Station Number VA-FX-51 Latitude 38.903
Station Name Vienna 1.3 W Longitude -77.2836
County Fairfax Elevation (ft) 371



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 3.55 6.10 31 6.10 31 0.00 0 0 10 5 0.0 0 0
Nov 10 3.35 2.45 30 2.45 30 0.00 0 0 9 1 0.0 0 0
Dec 10 3.17 1.78 31 1.78 31 0.00 0 0 6 3 1.6 3 2
Jan 11 2.94 2.33 31 2.33 31 0.00 0 0 7 6 10.8 4 10
Feb 11 2.74 1.97 28 1.97 25 0.00 3 1 11 0 0.2 1 7
March 11 3.67 5.61 30 5.61 30 0.00 0 0 14 0 0.1 1 0
April 11 3.34 4.35 29 4.35 29 0.00 0 0 18 3 0.0 0 0
May 11 4.24 3.53 30 3.53 30 0.00 0 0 14 6 0.0 0 0
June 11 3.98 2.25 29 2.25 23 0.00 6 0 9 4 0.0 0 0
July 11 4.03 4.84 31 4.37 28 0.47 3 2 9 0 0.0 0 0
Aug 11 3.36 6.96 31 6.96 31 0.00 0 0 15 1 0.0 0 0
Sept 11 4.00 11.81 30 11.80 28 0.01 2 1 16 6 0.0 0 0
Water Year Totals: 42.37" 53.98" 361 days 53.50" 347 0.48" 14 days 4 138 days 35 days 12.7" 9 days 19 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 2.81
10/2/2010 T
10/3/2010 0.00
10/4/2010 0.86
10/5/2010 0.11
10/6/2010 0.01
10/7/2010 0.07
10/8/2010 0.00
10/9/2010 0.00
10/10/2010 0.00
10/11/2010 0.00
10/12/2010 0.00
10/13/2010 0.00
10/14/2010 T
10/15/2010 0.93
10/16/2010 0.01
10/17/2010 0.00
10/18/2010 0.00
10/19/2010 T
10/20/2010 T
10/21/2010 0.06
10/22/2010 0.00
10/23/2010 0.00
10/24/2010 0.00
10/25/2010 0.00
10/26/2010 T
10/27/2010 0.49
10/28/2010 0.75
10/29/2010 0.00
10/30/2010 0.00
10/31/2010 0.00
11/1/2010 0.00
11/2/2010 0.00
11/3/2010 0.00
11/4/2010 0.60
11/5/2010 0.75
11/6/2010 0.00
11/7/2010 0.00
11/8/2010 0.00
11/9/2010 0.00
11/10/2010 0.00
11/11/2010 0.00
11/12/2010 0.00
11/13/2010 0.00
11/14/2010 0.00
11/15/2010 0.00
11/16/2010 0.23
11/17/2010 0.76
11/18/2010 0.00
11/19/2010 0.00
11/20/2010 0.00
11/21/2010 0.00
11/22/2010 T
11/23/2010 0.00
11/24/2010 0.02
11/25/2010 0.05
11/26/2010 0.01
11/27/2010 0.01
11/28/2010 0.00
11/29/2010 0.00
11/30/2010 0.02
12/1/2010 0.42
12/2/2010 0.49
12/3/2010 0.00
12/4/2010 0.00
12/5/2010 0.00
12/6/2010 0.00
12/7/2010 0.00
12/8/2010 0.00
12/9/2010 0.00
12/10/2010 0.00
12/11/2010 T
12/12/2010 0.40
12/13/2010 0.27
12/14/2010 T
12/15/2010 0.00
12/16/2010 0.00
12/17/2010 0.19
12/18/2010 0.00
12/19/2010 0.00
12/20/2010 0.00
12/21/2010 0.00
12/22/2010 0.00
12/23/2010 0.00
12/24/2010 0.00
12/25/2010 0.00
12/26/2010 T
12/27/2010 0.01
12/28/2010 0.00
12/29/2010 0.00
12/30/2010 0.00
12/31/2010 0.00
Day of YearDaily PrcpMultiday Prcp
1/1/2011 0.00
1/2/2011 0.01
1/3/2011 T
1/4/2011 0.00
1/5/2011 0.00
1/6/2011 0.00
1/7/2011 T
1/8/2011 0.02
1/9/2011 T
1/10/2011 0.00
1/11/2011 0.00
1/12/2011 0.12
1/13/2011 0.00
1/14/2011 T
1/15/2011 0.00
1/16/2011 0.00
1/17/2011 0.00
1/18/2011 0.43
1/19/2011 T
1/20/2011 0.00
1/21/2011 T
1/22/2011 0.00
1/23/2011 0.00
1/24/2011 0.00
1/25/2011 0.00
1/26/2011 0.28
1/27/2011 1.39
1/28/2011 0.00
1/29/2011 0.08
1/30/2011 0.00
1/31/2011 0.00
2/1/2011 0.01
2/2/2011 0.83
2/3/2011 0.01
2/4/2011 0.00
2/5/2011 0.09
2/6/2011 0.10
2/7/2011 0.00
2/8/2011 0.02
2/9/2011 0.00
2/10/2011 0.01
2/11/2011 0.00
2/12/2011 0.00
2/13/2011 0.00
2/14/2011 0.00
2/15/2011 0.00
2/16/2011 0.00
2/17/2011 0.00
2/18/2011 **
2/19/2011 **
2/20/2011 0.00
2/21/2011 0.00
2/22/2011 0.30
2/23/2011 0.00
2/24/2011 0.00
2/25/2011 0.26
2/26/2011 0.06
2/27/2011 0.00
2/28/2011 0.28
3/1/2011 0.45
3/2/2011 0.00
3/3/2011 0.00
3/4/2011 0.00
3/5/2011 0.00
3/6/2011 0.28
3/7/2011 1.93
3/8/2011 0.00
3/9/2011 0.00
3/10/2011 0.57
3/11/2011 1.01
3/12/2011 0.00
3/13/2011 0.00
3/14/2011 0.00
3/15/2011
3/16/2011 0.57
3/17/2011 0.00
3/18/2011 0.00
3/19/2011 0.01
3/20/2011 0.00
3/21/2011 0.22
3/22/2011 0.03
3/23/2011 0.01
3/24/2011 0.25
3/25/2011 0.05
3/26/2011 0.00
3/27/2011 0.01
3/28/2011 0.00
3/29/2011 0.00
3/30/2011 0.00
3/31/2011 0.22
Day of YearDaily PrcpMultiday Prcp
4/1/2011
4/2/2011 0.01
4/3/2011 0.02
4/4/2011 0.01
4/5/2011 0.30
4/6/2011 0.15
4/7/2011 0.00
4/8/2011 0.02
4/9/2011 0.38
4/10/2011 0.01
4/11/2011 0.00
4/12/2011 T
4/13/2011 0.73
4/14/2011 0.01
4/15/2011 0.00
4/16/2011 0.02
4/17/2011 1.68
4/18/2011 T
4/19/2011 0.00
4/20/2011 0.04
4/21/2011 0.00
4/22/2011 0.00
4/23/2011 0.50
4/24/2011 0.01
4/25/2011 0.04
4/26/2011 0.00
4/27/2011 T
4/28/2011 0.16
4/29/2011 0.26
4/30/2011 0.00
5/1/2011 0.00
5/2/2011 0.04
5/3/2011 T
5/4/2011 0.32
5/5/2011 0.20
5/6/2011 0.00
5/7/2011 T
5/8/2011 T
5/9/2011 0.00
5/10/2011 0.00
5/11/2011 0.00
5/12/2011 0.00
5/13/2011 0.01
5/14/2011 0.03
5/15/2011 1.10
5/16/2011 0.10
5/17/2011
5/18/2011 0.90
5/19/2011 0.17
5/20/2011 0.28
5/21/2011 T
5/22/2011 0.00
5/23/2011 0.10
5/24/2011 0.03
5/25/2011 0.04
5/26/2011 T
5/27/2011 0.00
5/28/2011 0.21
5/29/2011 T
5/30/2011 0.00
5/31/2011 0.00
6/1/2011 0.00
6/2/2011 0.06
6/3/2011 0.00
6/4/2011 0.00
6/5/2011 0.00
6/6/2011 0.00
6/7/2011 0.00
6/8/2011 0.00
6/9/2011 0.00
6/10/2011 0.04
6/11/2011 0.00
6/12/2011 T
6/13/2011 0.41
6/14/2011 0.00
6/15/2011 T
6/16/2011 0.01
6/17/2011 1.45
6/18/2011 0.21
6/19/2011 0.01
6/20/2011
6/21/2011 0.05
6/22/2011 0.01
6/23/2011 T
6/24/2011 T
6/25/2011 **
6/26/2011 **
6/27/2011 **
6/28/2011 **
6/29/2011 **
6/30/2011 **
Day of YearDaily PrcpMultiday Prcp
7/1/2011 0.05
7/2/2011 0.00
7/3/2011 0.27
7/4/2011 0.06
7/5/2011 0.01
7/6/2011 0.00
7/7/2011 0.07
7/8/2011 **
7/9/2011 0.42
7/10/2011 0.00
7/11/2011 0.00
7/12/2011 0.01
7/13/2011 0.00
7/14/2011 3.23
7/15/2011 0.00
7/16/2011 0.00
7/17/2011 0.00
7/18/2011 0.00
7/19/2011 0.00
7/20/2011 0.04
7/21/2011 0.00
7/22/2011 0.00
7/23/2011 0.20
7/24/2011 0.00
7/25/2011 0.00
7/26/2011 0.48
7/27/2011 0.00
7/28/2011 0.00
7/29/2011 0.00
7/30/2011 0.00
7/31/2011 0.00
8/1/2011 0.00
8/2/2011 0.24
8/3/2011 0.03
8/4/2011 0.16
8/5/2011 0.00
8/6/2011 0.00
8/7/2011 0.29
8/8/2011 0.19
8/9/2011 0.00
8/10/2011 0.01
8/11/2011 0.00
8/12/2011 0.00
8/13/2011 0.00
8/14/2011 0.87
8/15/2011 0.28
8/16/2011 T
8/17/2011 0.00
8/18/2011 0.00
8/19/2011 0.72
8/20/2011 1.21
8/21/2011 0.00
8/22/2011 0.03
8/23/2011 0.00
8/24/2011 0.00
8/25/2011 0.00
8/26/2011 0.49
8/27/2011 0.01
8/28/2011 2.28
8/29/2011 0.15
8/30/2011 0.00
8/31/2011 0.00
9/1/2011 0.00
9/2/2011 T
9/3/2011 0.00
9/4/2011 0.01
9/5/2011 T
9/6/2011 1.41
9/7/2011 0.75
9/8/2011 2.18
9/9/2011 5.20
9/10/2011 0.86
9/11/2011 0.00
9/12/2011 0.03
9/13/2011 0.00
9/14/2011 0.00
9/15/2011 0.01
9/16/2011 0.06
9/17/2011 0.00
9/18/2011 **
9/19/2011 0.01
9/20/2011 T
9/21/2011 0.21
9/22/2011 0.12
9/23/2011 T
9/24/2011 0.54
9/25/2011 0.05
9/26/2011 0.01
9/27/2011 T
9/28/2011 0.24
9/29/2011 0.12
9/30/2011 T



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2010 7:00 AM 2.81 M M M M
10/2/2010 8:00 AM T M M M M
10/3/2010 9:00 AM 0.00 0.0 M M M
10/4/2010 7:15 AM 0.86 M M M M Steady gentle rain, began mid-afternoon
10/5/2010 7:10 AM 0.11 M M M M
10/6/2010 7:10 AM 0.01 M M M M
10/7/2010 7:10 AM 0.07 M M M M
10/8/2010 8:00 AM 0.00 0.0 M M M
10/9/2010 8:00 AM 0.00 0.0 M M M
10/10/2010 8:00 AM 0.00 0.0 M M M
10/11/2010 8:00 AM 0.00 0.0 M M M
10/12/2010 8:00 AM 0.00 0.0 M M M
10/13/2010 8:00 AM 0.00 0.0 M M M
10/14/2010 7:10 AM T M M M M
10/15/2010 7:20 AM 0.93 M M M M
10/16/2010 8:00 AM 0.01 M M M M
10/17/2010 8:00 AM 0.00 0.0 M M M
10/18/2010 7:15 AM 0.00 0.0 M M M
10/19/2010 7:30 AM T M M M M
10/20/2010 7:15 AM T M M M M
10/21/2010 7:10 AM 0.06 M 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 8:00 AM 0.00 0.0 M M M
10/25/2010 8:00 AM 0.00 0.0 M M M
10/26/2010 7:10 AM T M M M M
10/27/2010 7:15 AM 0.49 M M M M
10/28/2010 7:15 AM 0.75 M M M M
10/29/2010 8:00 AM 0.00 0.0 M M M
10/30/2010 8:00 AM 0.00 0.0 M M M
10/31/2010 8:00 AM 0.00 0.0 M M M
11/1/2010 8:00 AM 0.00 0.0 M M M
11/2/2010 8:00 AM 0.00 0.0 M M M
11/3/2010 8:00 AM 0.00 0.0 M M M
11/4/2010 7:15 AM 0.60 M M M M
11/5/2010 7:15 AM 0.75 M M M M
11/6/2010 8:00 AM 0.00 0.0 M M M
11/7/2010 8:00 AM 0.00 0.0 M M M
11/8/2010 8:00 AM 0.00 0.0 M M M
11/9/2010 8:00 AM 0.00 0.0 M M M
11/10/2010 8:00 AM 0.00 0.0 M M M
11/11/2010 8:00 AM 0.00 0.0 M M M
11/12/2010 7:15 AM 0.00 0.0 M M M
11/13/2010 8:00 AM 0.00 0.0 M M M
11/14/2010 8:00 AM 0.00 0.0 M M M
11/15/2010 7:30 AM 0.00 0.0 M M M
11/16/2010 7:15 AM 0.23 M M M M
11/17/2010 7:00 AM 0.76 M M M M includes a midnight thunderstorm
11/18/2010 8:00 AM 0.00 0.0 M M M
11/19/2010 8:00 AM 0.00 0.0 M M M
11/20/2010 8:00 AM 0.00 0.0 M M M
11/21/2010 8:00 AM 0.00 0.0 M M M
11/22/2010 7:15 AM T M M M M
11/23/2010 8:00 AM 0.00 0.0 M M M
11/24/2010 8:00 AM 0.02 M M M M
11/25/2010 8:45 AM 0.05 M M M M
11/26/2010 8:00 AM 0.01 M M M M
11/27/2010 9:00 AM 0.01 M M M M
11/28/2010 8:00 AM 0.00 0.0 M M M
11/29/2010 8:00 AM 0.00 0.0 M M M
11/30/2010 7:10 AM 0.02 M M M M
12/1/2010 7:15 AM 0.42 M M M M
12/2/2010 7:30 AM 0.49 M M M M
12/3/2010 7:15 AM 0.00 0.0 M M M
12/4/2010 8:00 AM 0.00 0.0 M M M
12/5/2010 8:00 AM 0.00 0.0 M M M
12/6/2010 7:30 AM 0.00 0.0 M M M
12/7/2010 7:30 AM 0.00 0.0 M M M
12/8/2010 8:00 AM 0.00 0.0 M M M
12/9/2010 7:30 AM 0.00 0.0 M M M
12/10/2010 7:30 AM 0.00 0.0 M M M
12/11/2010 8:00 AM T M M M M First snow! A very light flurry that melted within the hour.
12/12/2010 7:15 AM 0.40 M M M M
12/13/2010 7:30 AM 0.27 0.1 M T M Snow mainly on grassy areas, barely covering
12/14/2010 7:30 AM T M M M M
12/15/2010 8:00 AM 0.00 0.0 M M M
12/16/2010 8:00 AM 0.00 0.0 M M M
12/17/2010 8:15 AM 0.19 1.3 M 1.3 M
12/18/2010 8:00 AM 0.00 0.0 M 1.2 M
12/19/2010 8:00 AM 0.00 0.0 M M M
12/20/2010 8:00 AM 0.00 0.0 M M M
12/21/2010 8:00 AM 0.00 0.0 M M M
12/22/2010 8:00 AM 0.00 0.0 M M M
12/23/2010 8:00 AM 0.00 0.0 M M M
12/24/2010 8:00 AM 0.00 0.0 M M M
12/25/2010 7:00 AM 0.00 0.0 M M M
12/26/2010 8:00 AM T M M M M Some big beautiful flakes mid-morning on Christmas day, around 9-10 a.m.
12/27/2010 8:45 AM 0.01 0.2 M T M High winds this morning. Most of the snow that fell last night has blown away.
12/28/2010 8:00 AM 0.00 0.0 M M M
12/29/2010 7:30 AM 0.00 0.0 M M M
12/30/2010 8:00 AM 0.00 0.0 M M M
12/31/2010 8:00 AM 0.00 0.0 M M M
1/1/2011 8:00 AM 0.00 0.0 M M M
1/2/2011 9:00 AM 0.01 M M M M
1/3/2011 7:15 AM T M M M M
1/4/2011 7:15 AM 0.00 0.0 M M M
1/5/2011 8:00 AM 0.00 0.0 M M M
1/6/2011 7:00 AM 0.00 0.0 M M M
1/7/2011 7:10 AM T M M M M
1/8/2011 8:30 AM 0.02 0.4 0.02 0.4 0.02 very fluffy snow, barely covering grass and road
1/9/2011 8:45 AM T M M M M Brief flurries yesterday afternoon. A little snow left on the ground only in shaded areas.
1/10/2011 8:00 AM 0.00 0.0 M M M
1/11/2011 8:00 AM 0.00 0.0 M M M
1/12/2011 8:15 AM 0.12 1.1 M 1.1 M all snow
1/13/2011 8:00 AM 0.00 0.0 M 0.5 M
1/14/2011 8:00 AM T T M 0.3 M a dusting of snow before dawn
1/15/2011 8:00 AM 0.00 0.0 M T M
1/16/2011 8:00 AM 0.00 0.0 M T M A little snow remains in shady spots.
1/17/2011 8:00 AM 0.00 0.0 M T M
1/18/2011 8:00 AM 0.43 M M 0.3 M Started as light snow last evening, changed to sleet/freezing rain overnight. Ice accretion on branches is 0.1 inch. Ice on my driveway and snowboard is 0.3.
1/19/2011 8:00 AM T M M T M
1/20/2011 8:00 AM 0.00 0.0 M T M A bit of snow still left in shady spots.
1/21/2011 7:00 AM T M M T M Dusting of snow, stuck to grassy areas and shaded sidewalks.
1/22/2011 8:00 AM 0.00 0.0 M M M
1/23/2011 8:00 AM 0.00 0.0 M M M
1/24/2011 8:00 AM 0.00 0.0 M M M
1/25/2011 8:00 AM 0.00 0.0 M M M
1/26/2011 9:00 AM 0.28 0.4 M M M wet slush on the ground, from a mix of rain and snow overnight.
1/27/2011 8:00 AM 1.39 8.9 1.39 8.9 M Only about 4" fell in the tube, so values are from core. Storm started with a little snow-thunder, yesterday around 3 p.m., and sleet. Changed to heavy snow at 4 pm (2" per hour), continued to fall as heavy snow past 9 pm, ended around 11 pm.
1/28/2011 8:15 AM 0.00 0.0 M 7.5 1.35
1/29/2011 8:30 AM 0.08 M M 7.0 M Light snow for a few hours during the day yesterday, melted in the gauge
1/30/2011 9:00 AM 0.00 0.0 M 7.0 M
1/31/2011 8:00 AM 0.00 0.0 M 6.5 M
2/1/2011 8:30 AM 0.01 M M 6.0 M freezing drizzle
2/2/2011 7:20 AM 0.83 M M 4.5 M overnight rain
2/3/2011 7:30 AM 0.01 M M 3.0 M Snow is melting slowly, filling small creekbeds but no flooding.
2/4/2011 7:30 AM 0.00 0.0 M 3.0 M
2/5/2011 8:30 AM 0.09 M M 2.5 M Drizzle and fog at 8:30 a.m. Snow measured in shade; unshaded areas, and under trees, now have no snow.
2/6/2011 8:40 AM 0.10 M M 2.0 M drizzle through much of the day yesterday. snow measured in shady areas; sunny areas are bare
2/7/2011 8:00 AM 0.00 0.0 M M M
2/8/2011 7:15 AM 0.02 M M M M
2/9/2011 7:30 AM 0.00 0.0 M M M
2/10/2011 7:30 AM 0.01 T M T M flurries overnight
2/11/2011 8:00 AM 0.00 0.0 M M M
2/12/2011 8:00 AM 0.00 0.0 M M M
2/13/2011 8:00 AM 0.00 0.0 M M M
2/14/2011 8:00 AM 0.00 0.0 M M M
2/15/2011 7:15 AM 0.00 0.0 M M M
2/16/2011 7:30 AM 0.00 0.0 M M M
2/17/2011 7:30 AM 0.00 0.0 M M M
2/21/2011 7:30 AM 0.00 0.0 M M M
2/22/2011 8:30 AM 0.30 0.2 M 0.2 M mix of rain, sleet and snow
2/23/2011 8:00 AM 0.00 0.0 M M M
2/24/2011 8:00 AM 0.00 0.0 M M M A trace of snow remains in shaded areas.
2/25/2011 7:30 AM 0.26 M M M M
2/26/2011 7:00 AM 0.06 0.0 M M M
2/27/2011 8:00 AM 0.00 0.0 M M M
2/28/2011 7:15 AM 0.28 M M M M overnight rain, included a mild thunderstorm
3/1/2011 7:15 AM 0.45 M M M M
3/2/2011 8:00 AM 0.00 0.0 M M M
3/3/2011 8:00 AM 0.00 0.0 M M M
3/4/2011 8:00 AM 0.00 0.0 M M M
3/5/2011 7:00 AM 0.00 0.0 M M M
3/6/2011 8:45 AM 0.28 M M M M
3/7/2011 7:20 AM 1.93 M M M M
3/8/2011 7:00 AM 0.00 0.0 M M M
3/9/2011 8:00 AM 0.00 0.0 M M M
3/10/2011 7:15 AM 0.57 M M M M
3/11/2011 7:30 AM 1.01 M M M M
3/12/2011 7:30 AM 0.00 0.0 M M M
3/13/2011 8:00 AM 0.00 0.0 M M M
3/14/2011 7:30 AM 0.00 0.0 M M M
3/16/2011 7:15 AM 0.57 M M M M
3/17/2011 7:30 AM 0.00 0.0 M M M
3/18/2011 8:00 AM 0.00 0.0 M M M
3/19/2011 8:00 AM 0.01 M M M M
3/20/2011 8:00 AM 0.00 0.0 M M M
3/21/2011 7:30 AM 0.22 M M M M early morning thunderstorms
3/22/2011 8:00 AM 0.03 M M M M From yesterday's morning thunderstorm (around 7:30)
3/23/2011 8:00 AM 0.01 M M M M
3/24/2011 7:10 AM 0.25 M M M M
3/25/2011 7:15 AM 0.05 M M M M
3/26/2011 7:15 AM 0.00 0.0 M M M
3/27/2011 8:45 AM 0.01 0.1 M M M A dusting of snow around dawn, only sticking to grassy areas, already disappearing.
3/28/2011 8:00 AM 0.00 0.0 M M M
3/29/2011 8:00 AM 0.00 0.0 M M M
3/30/2011 7:00 AM 0.00 0.0 M M M
3/31/2011 7:10 AM 0.22 M M M M
4/2/2011 8:30 AM 0.01 M M M M
4/3/2011 8:00 AM 0.02 M M M M
4/4/2011 8:00 AM 0.01 M M M M
4/5/2011 7:15 AM 0.30 M M M M
4/6/2011 7:45 AM 0.15 M M M M
4/7/2011 8:00 AM 0.00 0.0 M M M
4/8/2011 7:00 AM 0.02 M M M M
4/9/2011 6:30 AM 0.38 M M M M
4/10/2011 9:00 AM 0.01 M M M M
4/11/2011 8:00 AM 0.00 0.0 M M M
4/12/2011 7:30 AM T M M M M
4/13/2011 7:15 AM 0.73 M M M M
4/14/2011 7:15 AM 0.01 M M M M
4/15/2011 8:00 AM 0.00 0.0 M M M
4/16/2011 8:45 AM 0.02 M M M M
4/17/2011 8:00 AM 1.68 M M M M
4/18/2011 8:00 AM T M M M M
4/19/2011 7:30 AM 0.00 0.0 M M M
4/20/2011 8:00 AM 0.04 M M M M
4/21/2011 8:00 AM 0.00 0.0 M M M
4/22/2011 7:45 AM 0.00 0.0 M M M
4/23/2011 7:15 AM 0.50 M M M M
4/24/2011 9:00 AM 0.01 M M M M
4/25/2011 8:00 AM 0.04 M M M M
4/26/2011 8:00 AM 0.00 0.0 M M M
4/27/2011 7:00 AM T M M M M
4/28/2011 7:00 AM 0.16 M M M M
4/29/2011 8:00 AM 0.26 M M M M
4/30/2011 8:00 AM 0.00 0.0 M M M
5/1/2011 8:00 AM 0.00 0.0 M M M
5/2/2011 8:00 AM 0.04 M M M M
5/3/2011 8:00 AM T M M M M
5/4/2011 7:15 AM 0.32 M M M M
5/5/2011 7:30 AM 0.20 M M M M
5/6/2011 7:10 AM 0.00 0.0 M M M
5/7/2011 6:30 AM T M M M M
5/8/2011 8:30 AM T M M M M
5/9/2011 8:00 AM 0.00 0.0 M M M
5/10/2011 7:30 AM 0.00 0.0 M M M
5/11/2011 8:00 AM 0.00 0.0 M M M
5/12/2011 8:00 AM 0.00 0.0 M M M
5/13/2011 8:00 AM 0.01 M M M M
5/14/2011 8:00 AM 0.03 M M M M
5/15/2011 8:00 AM 1.10 M M M M
5/16/2011 6:45 AM 0.10 M M M M
5/18/2011 8:00 AM 0.90 M M M M
5/19/2011 8:00 AM 0.17 M M M M
5/20/2011 9:00 AM 0.28 M M M M
5/21/2011 9:00 AM T M M M M
5/22/2011 9:00 AM 0.00 0.0 M M M
5/23/2011 6:45 AM 0.10 M M M M
5/24/2011 7:45 AM 0.03 M M M M
5/25/2011 7:15 AM 0.04 M M M M
5/26/2011 8:00 AM T M M M M
5/27/2011 7:15 AM 0.00 0.0 M M M
5/28/2011 8:00 AM 0.21 M M M M
5/29/2011 8:00 AM T M M M M
5/30/2011 8:00 AM 0.00 0.0 M M M
5/31/2011 7:00 AM 0.00 0.0 M M M Hot, Hot, Hot - in the 90's yesterday and today.
6/1/2011 8:00 AM 0.00 0.0 M M M 80 degrees at 7 a.m.
6/2/2011 8:00 AM 0.06 M M M M
6/3/2011 8:00 AM 0.00 0.0 M M M
6/4/2011 8:00 AM 0.00 0.0 M M M
6/5/2011 8:00 AM 0.00 0.0 M M M
6/6/2011 8:00 AM 0.00 0.0 M M M
6/7/2011 8:00 AM 0.00 0.0 M M M
6/8/2011 8:00 AM 0.00 0.0 M M M
6/9/2011 7:45 AM 0.00 0.0 M M M
6/10/2011 8:00 AM 0.04 M M M M
6/11/2011 8:00 AM 0.00 0.0 M M M
6/12/2011 8:00 AM T M M M M
6/13/2011 7:15 AM 0.41 M M M M From a late afternoon thunderstorm
6/14/2011 7:00 AM 0.00 0.0 M M M
6/15/2011 8:00 AM T M M M M
6/16/2011 7:30 AM 0.01 M M M M Light rain at time of measurement
6/17/2011 7:00 AM 1.45 M M M M Heavy evening thunderstorm
6/18/2011 9:00 AM 0.21 M M M M a couple of small thunderstorms
6/19/2011 7:20 AM 0.01 M M M M
6/21/2011 8:30 AM 0.05 M M M M
6/22/2011 8:00 AM 0.01 M M M M
6/23/2011 8:30 AM T M M M M
6/24/2011 8:45 AM T M M M M
7/2/2011 8:45 AM 0.00 0.0 M M M
7/3/2011 7:00 AM 0.27 M M M M
7/4/2011 7:30 AM 0.06 M M M M
7/5/2011 8:00 AM 0.01 M M M M
7/6/2011 8:00 AM 0.00 0.0 M M M
7/7/2011 8:00 AM 0.07 M M M M
7/10/2011 8:00 AM 0.00 0.0 M M M
7/11/2011 8:00 AM 0.00 0.0 M M M
7/12/2011 8:00 AM 0.01 M M M M We were in a gap in a line of strong thunderstorms last night
7/13/2011 8:00 AM 0.00 0.0 M M M
7/14/2011 7:30 AM 3.23 M M M M Most fell during about 30 minutes during a thunderstorm mid-afternoon, extremely heavy downpour with strong winds; immediately followed by a second thunderstorm
7/15/2011 8:00 AM 0.00 0.0 M M M
7/16/2011 8:00 AM 0.00 0.0 M M M
7/17/2011 8:00 AM 0.00 0.0 M M M
7/18/2011 7:30 AM 0.00 0.0 M M M
7/19/2011 7:30 AM 0.00 0.0 M M M
7/20/2011 8:00 AM 0.04 M M M M Scattered small thunderstorms in our region yesterday afternoon, which passed us by except for a brief shower.
7/21/2011 8:00 AM 0.00 0.0 M M M
7/22/2011 8:00 AM 0.00 0.0 M M M
7/23/2011 8:00 AM 0.20 M M M M
7/24/2011 8:00 AM 0.00 0.0 M M M
7/25/2011 7:30 AM 0.00 0.0 M M M
7/26/2011 7:30 AM 0.48 M M M M Small, scattered thunderstorms yesterday afternoon; a few brief downpours with longer periods of rain
7/27/2011 8:00 AM 0.00 0.0 M M M
7/28/2011 8:00 AM 0.00 0.0 M M M
7/29/2011 8:00 AM 0.00 0.0 M M M
7/30/2011 8:00 AM 0.00 0.0 M M M
7/31/2011 7:30 AM 0.00 0.0 M M M
8/1/2011 8:00 AM 0.00 0.0 M M M
8/2/2011 8:00 AM 0.24 M M M M A couple of small thunderstorms yesterday late afternoon through the evening; more lightning than rain
8/3/2011 8:20 AM 0.03 M M M M
8/4/2011 8:00 AM 0.16 M M M M gentle rain on and off, mostly in the evening and overnight
8/5/2011 8:00 AM 0.00 0.0 M M M
8/6/2011 7:30 AM 0.00 0.0 M M M
8/7/2011 9:00 AM 0.29 M M M M
8/8/2011 8:00 AM 0.19 M M M M
8/9/2011 8:00 AM 0.00 0.0 M M M
8/10/2011 8:00 AM 0.01 M M M M
8/11/2011 8:00 AM 0.00 0.0 M M M
8/12/2011 8:00 AM 0.00 0.0 M M M
8/13/2011 8:00 AM 0.00 0.0 M M M
8/14/2011 8:15 AM 0.87 M M M M About 3/4 inch from a downpour yesterday afternoon
8/15/2011 8:15 AM 0.28 M M M M a few scattered thunderstorms through the period
8/16/2011 8:00 AM T M M M M
8/17/2011 8:00 AM 0.00 0.0 M M M
8/18/2011 8:00 AM 0.00 0.0 M M M
8/19/2011 8:00 AM 0.72 M M M M several thunderstorms, beginning 3 PM till after midnight. Lots of lightning too.
8/20/2011 8:00 AM 1.21 M M M M From one intense thunderstorm, mostly 7-7:30 p.m. Cloud opened up over our town; about 2 miles west the streets were dry.
8/21/2011 8:00 AM 0.00 0.0 M M M
8/22/2011 7:30 AM 0.03 M M M M One small, brief thunderstorm.
8/23/2011 8:00 AM 0.00 0.0 M M M
8/24/2011 7:45 AM 0.00 0.0 M M M Yesterday's earthquake definitely felt here. The rumbling was so loud it was obvious over the noise of my neighbor's lawnmower.
8/25/2011 7:30 AM 0.00 0.0 M M M
8/26/2011 8:00 AM 0.49 M M M M A couple of afternoon, mild, thunderstorms
8/27/2011 8:15 AM 0.01 M M M M First band of clouds from Hurricane Irene went over in the early afternoon,yesterday. Very large, numerous, tropical-looking cumulus. Precip occurred sometime overnight. Right now: light winds, clouds moving east to west, complete cloud cover. Tomorrow will be a different story!
8/28/2011 7:10 AM 2.28 M M M M Hurricane Irene. Rain began around 11:00 a.m. yesterday, still raining lightly now. Steady through most of the day, no downpours. Strongest winds were around 1:30 - 3:00 a.m. today, at least they were strong enough to wake me up and make the house creak.
8/29/2011 8:00 AM 0.15 M M M M From the last band of Hurricane Irene. Sky started to clear by around 11 a.m.
8/30/2011 8:00 AM 0.00 0.0 M M M
8/31/2011 8:00 AM 0.00 0.0 M M M
9/1/2011 8:00 AM 0.00 0.0 M M M
9/2/2011 8:00 AM T M M M M
9/3/2011 8:00 AM 0.00 0.0 M M M
9/4/2011 8:00 AM 0.01 M M M M Caught the eastern edge of a small but very intense mid-morning thunderstorm
9/5/2011 8:00 AM T M M M M
9/6/2011 7:15 AM 1.41 M M M M Remnants of Lee. Held off to the west until late in the day; fairly heavy spells after sunset. Drizzle at time of reading.
9/7/2011 8:00 AM 0.75 M M M M
9/8/2011 7:15 AM 2.18 M M M M More leftovers from TS Lee. Very heavy downpours at times.
9/9/2011 8:30 AM 5.20 M M M M Still more from T.S. Lee. Power was out during the heaviest downpour yesterday mid-afternoon so I could not do a significant weather report. Extreme flooding in our neighborhood with streams well over their banks. Many streets and small bridges closed in Vienna and Reston at times. Sadly, one boy drowned in our town, two others in DC metro area. Schools are closed today. And it's still raining.
9/10/2011 8:00 AM 0.86 M M M M Good riddance to T.S. Lee. The sun came out, finally, yesterday noon. The 12-year-old boy who drowned Thursday had fallen into the creek in my neighborhood; it normally has a few inches of water but was truly a raging river at that time. Horrible.
9/11/2011 8:00 AM 0.00 0.0 M M M
9/12/2011 7:45 AM 0.03 M M M M mild thunderstorm, around 11:30 p.m.
9/13/2011 8:00 AM 0.00 0.0 M M M
9/14/2011 7:45 AM 0.00 0.0 M M M
9/15/2011 7:30 AM 0.01 M M M M
9/16/2011 8:00 AM 0.06 M M M M Gentle afternoon showers
9/17/2011 8:00 AM 0.00 0.0 M M M
9/20/2011 7:00 AM T M M M M Just barely starting to rain, more to come.
9/21/2011 7:15 AM 0.21 M M M M foggy at time of reading
9/22/2011 7:30 AM 0.12 M M M M
9/23/2011 7:30 AM T M M M M misting at time of recording
9/24/2011 8:00 AM 0.54 M M M M
9/25/2011 8:45 AM 0.05 M M M M
9/26/2011 7:00 AM 0.01 M M M M
9/27/2011 7:00 AM T M M M M barely sprinkling at time of reporting
9/28/2011 7:45 AM 0.24 M M M M thunderstorm began around 7:15 a.m. More rain than thunder.
9/29/2011 8:00 AM 0.12 M M M M
9/30/2011 8:00 AM T M M M M



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
2/18/2011 2/20/2011 2:00 PM 3 0.00 0.0 0.00
6/25/2011 7/01/2011 12:00 AM 7 0.05 M M
7/8/2011 7/09/2011 7:30 AM 2 0.42 M M
9/18/2011 9/19/2011 7:30 AM 2 0.01 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