Station Overview Station Location
Station Number MD-MG-120 Latitude 39.152611
Station Name Poolesville 5.4 W Longitude -77.509722
County Montgomery Elevation (ft) 231



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 18 3.19 2.34 30 2.12 26 0.22 4 2 8 0 0.0 0 0
Nov 18 3.40 4.68 14 4.68 14 0.00 0 0 8 0 1.0 1 1
Dec 18 2.94 1.03 4 1.03 4 0.00 0 0 2 0 0.0 0 0
Jan 19 2.58 1.90 22 1.90 22 0.00 0 0 9 0 10.0 3 3
Feb 19 2.53 0.17 4 0.17 4 0.00 0 0 2 0 0.0 0 0
March 19 3.52 3.29 16 3.29 16 0.00 0 0 6 0 0.0 0 0
April 19 3.32 3.63 30 3.63 30 0.00 0 0 13 1 0.0 0 0
May 19 4.46 5.37 31 5.37 31 0.00 0 0 14 1 0.0 0 0
June 19 3.77 2.95 29 2.95 29 0.00 0 0 13 0 0.0 0 0
July 19 3.65 6.33 31 6.33 29 0.00 2 1 12 2 0.0 0 0
Aug 19 3.22 2.25 30 2.25 30 0.00 0 0 14 1 0.0 0 0
Sept 19 3.89 0.27 30 0.27 26 0.00 4 2 5 1 0.0 0 0
Water Year Totals: 40.47" 34.21" 271 days 33.99" 261 0.22" 10 days 5 106 days 6 days 11.0" 4 days 4 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
10/1/2018 0.00
10/2/2018 0.00
10/3/2018 0.00
10/4/2018 0.00
10/5/2018 0.05
10/6/2018 0.00
10/7/2018 0.00
10/8/2018 0.00
10/9/2018 0.02
10/10/2018 0.00
10/11/2018 0.12
10/12/2018 0.74
10/13/2018 0.08
10/14/2018 0.00
10/15/2018 **
10/16/2018 0.17
10/17/2018 0.00
10/18/2018 0.00
10/19/2018 0.00
10/20/2018 0.05
10/21/2018 0.00
10/22/2018 **
10/23/2018 0.05
10/24/2018 0.00
10/25/2018 0.00
10/26/2018 0.00
10/27/2018 1.04
10/28/2018
10/29/2018 0.02
10/30/2018 0.00
10/31/2018 0.00
11/1/2018 0.00
11/2/2018 0.00
11/3/2018 1.56
11/4/2018 0.00
11/5/2018 0.66
11/6/2018 0.43
11/7/2018 0.44
11/8/2018 0.00
11/9/2018 M
11/10/2018 0.55
11/11/2018 0.00
11/12/2018 0.00
11/13/2018 0.93
11/14/2018 0.01
11/15/2018 0.10
11/16/2018 M
11/17/2018
11/18/2018
11/19/2018
11/20/2018
11/21/2018
11/22/2018
11/23/2018
11/24/2018
11/25/2018
11/26/2018
11/27/2018
11/28/2018
11/29/2018
11/30/2018
12/1/2018
12/2/2018
12/3/2018
12/4/2018
12/5/2018
12/6/2018
12/7/2018
12/8/2018
12/9/2018
12/10/2018
12/11/2018
12/12/2018
12/13/2018
12/14/2018
12/15/2018
12/16/2018
12/17/2018
12/18/2018
12/19/2018
12/20/2018
12/21/2018
12/22/2018
12/23/2018
12/24/2018
12/25/2018
12/26/2018
12/27/2018
12/28/2018 0.87
12/29/2018 0.16
12/30/2018 0.00
12/31/2018 0.00
Day of YearDaily PrcpMultiday Prcp
1/1/2019 0.63
1/2/2019 0.00
1/3/2019 0.00
1/4/2019 0.00
1/5/2019 0.15
1/6/2019 0.06
1/7/2019 0.00
1/8/2019 0.05
1/9/2019 0.15
1/10/2019 0.02
1/11/2019 0.00
1/12/2019 0.00
1/13/2019 0.44
1/14/2019 0.26
1/15/2019 0.00
1/16/2019 0.00
1/17/2019 0.00
1/18/2019 0.14
1/19/2019 0.00
1/20/2019 M
1/21/2019 0.00
1/22/2019 0.00
1/23/2019 0.00
1/24/2019
1/25/2019
1/26/2019
1/27/2019
1/28/2019
1/29/2019
1/30/2019
1/31/2019
2/1/2019
2/2/2019
2/3/2019
2/4/2019
2/5/2019
2/6/2019
2/7/2019 0.15
2/8/2019 0.02
2/9/2019 0.00
2/10/2019 0.00
2/11/2019
2/12/2019
2/13/2019
2/14/2019
2/15/2019
2/16/2019
2/17/2019
2/18/2019
2/19/2019
2/20/2019
2/21/2019
2/22/2019
2/23/2019
2/24/2019
2/25/2019
2/26/2019
2/27/2019
2/28/2019
3/1/2019
3/2/2019
3/3/2019
3/4/2019
3/5/2019
3/6/2019
3/7/2019
3/8/2019
3/9/2019
3/10/2019
3/11/2019
3/12/2019
3/13/2019
3/14/2019
3/15/2019
3/16/2019 0.01
3/17/2019 0.00
3/18/2019 0.00
3/19/2019 0.00
3/20/2019 0.00
3/21/2019 0.33
3/22/2019 2.76
3/23/2019 0.14
3/24/2019 0.00
3/25/2019 0.00
3/26/2019 0.00
3/27/2019 0.00
3/28/2019 0.00
3/29/2019 0.00
3/30/2019 0.02
3/31/2019 0.03
Day of YearDaily PrcpMultiday Prcp
4/1/2019 0.01
4/2/2019 0.00
4/3/2019 T
4/4/2019 0.00
4/5/2019 0.16
4/6/2019 0.22
4/7/2019 0.01
4/8/2019 0.05
4/9/2019 0.02
4/10/2019 0.00
4/11/2019 0.00
4/12/2019 0.00
4/13/2019 0.53
4/14/2019 0.00
4/15/2019 0.60
4/16/2019 0.00
4/17/2019 0.00
4/18/2019 0.00
4/19/2019 0.00
4/20/2019 1.48
4/21/2019 0.00
4/22/2019 0.00
4/23/2019 0.00
4/24/2019 0.00
4/25/2019 0.00
4/26/2019 0.26
4/27/2019 0.20
4/28/2019 0.05
4/29/2019 0.04
4/30/2019 0.00
5/1/2019 0.03
5/2/2019 0.00
5/3/2019 0.19
5/4/2019 0.42
5/5/2019 0.50
5/6/2019 1.04
5/7/2019 0.00
5/8/2019 0.00
5/9/2019 0.00
5/10/2019 T
5/11/2019 0.88
5/12/2019 0.34
5/13/2019 0.61
5/14/2019 0.70
5/15/2019 0.00
5/16/2019 0.03
5/17/2019 0.00
5/18/2019 0.00
5/19/2019 0.00
5/20/2019 0.00
5/21/2019 0.00
5/22/2019 0.00
5/23/2019 0.00
5/24/2019 0.25
5/25/2019 0.00
5/26/2019 0.17
5/27/2019 0.00
5/28/2019 0.13
5/29/2019 0.00
5/30/2019 0.00
5/31/2019 0.08
6/1/2019 0.00
6/2/2019 0.00
6/3/2019 0.22
6/4/2019 0.00
6/5/2019 0.00
6/6/2019 0.01
6/7/2019 0.00
6/8/2019 0.00
6/9/2019 0.00
6/10/2019 0.13
6/11/2019 0.25
6/12/2019 0.00
6/13/2019 0.96
6/14/2019 0.37
6/15/2019 0.00
6/16/2019 0.00
6/17/2019 0.00
6/18/2019 0.18
6/19/2019 0.06
6/20/2019 0.02
6/21/2019 0.05
6/22/2019 0.00
6/23/2019 0.00
6/24/2019 0.00
6/25/2019 0.30
6/26/2019
6/27/2019 0.00
6/28/2019 0.02
6/29/2019 0.00
6/30/2019 0.38
Day of YearDaily PrcpMultiday Prcp
7/1/2019 0.00
7/2/2019 0.00
7/3/2019 0.20
7/4/2019 T
7/5/2019 0.60
7/6/2019 0.00
7/7/2019 0.13
7/8/2019 1.45
7/9/2019 0.74
7/10/2019 0.00
7/11/2019 0.00
7/12/2019 1.49
7/13/2019 0.00
7/14/2019 0.00
7/15/2019 **
7/16/2019 0.00
7/17/2019 0.00
7/18/2019 0.50
7/19/2019 0.00
7/20/2019 0.00
7/21/2019 T
7/22/2019 0.04
7/23/2019 1.07
7/24/2019 0.07
7/25/2019 0.01
7/26/2019 0.00
7/27/2019 0.00
7/28/2019 0.00
7/29/2019 0.00
7/30/2019 0.00
7/31/2019 0.03
8/1/2019 0.01
8/2/2019 0.00
8/3/2019
8/4/2019 0.03
8/5/2019 0.00
8/6/2019 0.00
8/7/2019 0.00
8/8/2019 0.18
8/9/2019 0.01
8/10/2019 0.00
8/11/2019 0.00
8/12/2019 0.00
8/13/2019 0.00
8/14/2019 0.08
8/15/2019 0.00
8/16/2019 0.10
8/17/2019 0.00
8/18/2019 0.00
8/19/2019 0.00
8/20/2019 0.01
8/21/2019 0.22
8/22/2019 0.27
8/23/2019 0.59
8/24/2019 0.15
8/25/2019 0.01
8/26/2019 0.00
8/27/2019 T
8/28/2019 0.00
8/29/2019 0.57
8/30/2019 0.02
8/31/2019 0.00
9/1/2019 0.00
9/2/2019 0.17
9/3/2019 0.05
9/4/2019 0.00
9/5/2019 0.01
9/6/2019 0.00
9/7/2019 0.00
9/8/2019 0.00
9/9/2019 **
9/10/2019 0.00
9/11/2019 0.00
9/12/2019 T
9/13/2019 0.01
9/14/2019 0.00
9/15/2019 0.00
9/16/2019 0.00
9/17/2019 0.00
9/18/2019 0.00
9/19/2019 0.00
9/20/2019 0.00
9/21/2019 0.00
9/22/2019 0.00
9/23/2019 0.00
9/24/2019 0.03
9/25/2019 0.00
9/26/2019 0.00
9/27/2019 **
9/28/2019 0.00
9/29/2019 0.00
9/30/2019 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2018 7:30 AM 0.00 0.0 M M M Fog with visibility to 500-750'
10/2/2018 7:30 AM 0.00 0.0 M M M Totally overcast AM. Some dew present.
10/3/2018 7:30 AM 0.00 0.0 M M M Fog limiting visibility to 2500'.
10/4/2018 7:30 AM 0.00 0.0 M M M Partial visibility at 3000' due to fog.
10/5/2018 8:00 AM 0.05 M M M M
10/6/2018 7:30 AM 0.00 0.0 M M M
10/7/2018 7:30 AM 0.00 0.0 M M M Light fog in AM. Totally overcast.
10/8/2018 8:00 AM 0.00 0.0 M M M Fog with visibility to about 1000'.
10/9/2018 7:00 AM 0.02 M M M M It began raining for a few minutes ~0700.
10/10/2018 8:00 AM 0.00 0.0 M M M
10/11/2018 8:00 AM 0.12 M M M M
10/12/2018 8:00 AM 0.74 M M M M
10/13/2018 8:00 AM 0.08 M M M M
10/14/2018 7:30 AM 0.00 0.0 M M M
10/17/2018 7:30 AM 0.00 0.0 M M M There was 0.01" water in the rain gauge, but I suspect it is due to condensation.
10/18/2018 7:30 AM 0.00 0.0 M M M
10/19/2018 7:30 AM 0.00 0.0 M M M
10/20/2018 7:30 AM 0.05 M M M M
10/21/2018 7:30 AM 0.00 0.0 M M M
10/24/2018 7:30 AM 0.00 0.0 M M M
10/25/2018 7:30 AM 0.00 0.0 M M M Frost Report.
10/26/2018 7:30 AM 0.00 0.0 M M M
10/27/2018 8:00 AM 1.04 M M M M Skywarn report submitted.
10/29/2018 8:00 AM 0.02 M M M M
10/30/2018 7:30 AM 0.00 0.0 M M M
10/31/2018 7:30 AM 0.00 0.0 M M M At 0700 there was heavy fog westward toward the Potomac River, which is about 3750' away. Visibility was ~1000'. There was fog eastward also but it was slight with nearly no obscuring of the fences and farm land. By 0745 the for visibility became about 300'.
11/1/2018 7:30 AM 0.00 0.0 M M M
11/2/2018 7:30 AM 0.00 0.0 M M M
11/3/2018 7:30 AM 1.56 M M M M
11/4/2018 7:30 AM 0.00 0.0 M M M Frost report. Although there was <25% frost, it was only on the western side of the house toward the Potomac River. In the back where the LaCrosse weather station is in the field the temp was 36°F. There was also fog western part of the house limiting visibility to ~300'.
11/5/2018 7:50 AM 0.66 M M M M This wasn't that much rain, but the ground water table is high - see Condition Monitoring Report. The gravel road is even more destroyed than from the rain on 10/31 PM.
11/6/2018 7:40 AM 0.43 M M M M I collected the data at the stated time, but I failed to report it yesterday. It was misting at the time of data collection. Flooding and water run off is still occurring on all the roads out here.
11/7/2018 7:30 AM 0.44 M M M M
11/8/2018 7:30 AM 0.00 0.0 M M M
11/9/2018 7:30 AM M M M M M
11/10/2018 7:30 AM 0.55 0.0 M M M
11/11/2018 7:30 AM 0.00 0.0 M M M Frost report.
11/12/2018 7:30 AM 0.00 0.0 M M M Frost report.
11/13/2018 7:30 AM 0.93 M M M M Rain stopped before 0730.
11/14/2018 7:30 AM 0.01 M M M M
11/15/2018 7:45 AM 0.10 1.0 0.10 1.0 0.10 This will be the last report on snow until it is melted/melting. Too far and perhaps unsafe to retrieve this gauge. Retrieve data from MD-MG-103.
11/16/2018 8:00 AM M M M M M Until the weather and the location of this gauge improves, there will be no reporting from this station.
12/28/2018 8:30 AM 0.87 M M M M Rain began at 2055, very lightly on 12/27/2018. I reopened this station because the weather is not that bad to go out to it.
12/29/2018 7:30 AM 0.16 M M M M
12/30/2018 7:30 AM 0.00 0.0 M M M
12/31/2018 7:30 AM 0.00 0.0 M M M Fog visibility about 1000 feet.
1/1/2019 7:30 AM 0.63 M M M M
1/2/2019 7:30 AM 0.00 0.0 M M M
1/3/2019 7:30 AM 0.00 0.0 M M M
1/4/2019 7:30 AM 0.00 0.0 M M M Frost report. See MD-MG-103
1/5/2019 7:30 AM 0.15 M M M M
1/6/2019 7:30 AM 0.06 M M M M
1/7/2019 7:30 AM 0.00 0.0 M M M
1/8/2019 7:30 AM 0.05 M M M M
1/9/2019 7:30 AM 0.15 M M M M From this rain fall, this gauge recorded 0.04" greater than MD-MD-103.
1/10/2019 7:30 AM 0.02 T T T T There were intermittent snow squalls beginning at 1453 and ending about 1615. The snow first came down as 1/8" round pebbles. At 1503, the wind picked up and the snow were actually flakes. It stopped in 5 minutes and everything melted. At 1515 it picked up intermittently again as large clumps of flakes, lasting till 1615.
1/11/2019 7:30 AM 0.00 0.0 M M M
1/12/2019 7:30 AM 0.00 0.0 M M M Frost report.
1/13/2019 8:00 AM 0.44 4.8 0.44 4.8 0.44 Report not submitted earlier due to snow interference with satellite connectivity. The first flurries came down on 1/12 at 1409 for about 5 minutes. This was repeated at 1513 but for 10 minutes. At 1615 heavier snow came and continued as of this reading at 0800. While shoveling this AM, the ground was warm and hence it was easy to remove the snow to the grass, the gravel or stone walkway.
1/14/2019 8:00 AM 0.26 4.2 0.26 9.0 0.70
1/15/2019 7:30 AM 0.00 0.0 M M M
1/16/2019 7:30 AM 0.00 0.0 M M M Frost report.
1/17/2019 7:30 AM 0.00 0.0 M M M
1/18/2019 7:30 AM 0.14 1.0 0.14 1.0 0.14 The white board gave 1.0", which I melted. Elsewhere, in several spots, flat areas of grass and packed gravel, I got 1.5". Visibility was limited to 500-1000' in the direction of the river (west).
1/19/2019 7:30 AM 0.00 0.0 M M M
1/20/2019 7:30 AM M M M M M The rain gauge was removed for use with snow.
1/21/2019 7:30 AM 0.00 0.0 M M M No pptn, but cold, particularly for us. We hardly ever see temps of below 10-15F.
1/22/2019 7:30 AM 0.00 0.0 M M M
1/23/2019 7:30 AM 0.00 0.0 M M M
2/7/2019 7:30 AM 0.15 M M M M Returned rain gauge to location.
2/8/2019 7:30 AM 0.02 M M M M Fog visibility to 500-1000 feet.
2/9/2019 7:30 AM 0.00 0.0 M M M
2/10/2019 7:30 AM 0.00 0.0 M M M Frost report.
3/16/2019 7:30 AM 0.01 M M M M This rain gauge was set out again by noon 3/14.
3/17/2019 7:30 AM 0.00 0.0 M M M
3/18/2019 7:30 AM 0.00 0.0 M M M
3/19/2019 7:30 AM 0.00 0.0 M M M
3/20/2019 7:30 AM 0.00 0.0 M M M Frost report
3/21/2019 7:45 AM 0.33 M M M M
3/22/2019 7:30 AM 2.76 M M M M Both rain gauges reported the identical amount of rain. There was extensive flooding, with the pond overflowing considerably and River Road (gravel) being torn up by the water.
3/23/2019 7:30 AM 0.14 M M M M There were two periods of rain: 1525-1540 with very high winds and sheets of rain with visibility reduced to about 2500 feet with the sun coming out when it was over; 1650-1705 with ice pellets for 2 minutes and rain. There was no flooding from this rain. It was just added to all the run off that was continuing.
3/24/2019 7:30 AM 0.00 0.0 M M M Frost report
3/25/2019 7:30 AM 0.00 0.0 M M M
3/26/2019 7:30 AM 0.00 0.0 M M M
3/27/2019 7:30 AM 0.00 0.0 M M M Frost report.
3/28/2019 7:30 AM 0.00 0.0 M M M I forgot to submit this report.
3/29/2019 7:30 AM 0.00 0.0 M M M
3/30/2019 7:30 AM 0.02 M M M M Occasional drops of rain began at 1134 and continued into the afternoon till around 1600.
3/31/2019 8:00 AM 0.03 M M M M Very few drops at a time.
4/1/2019 7:30 AM 0.01 M M M M The pptn is due to the last few drops of rain after yesterday's measurement.
4/2/2019 7:30 AM 0.00 0.0 M M M NOTE: At 0935, while in Poolesville, MD, there were flurries for about 5 minutes.
4/3/2019 7:30 AM T M M M M Frost report.
4/4/2019 7:30 AM 0.00 0.0 M M M
4/5/2019 7:30 AM 0.16 M M M M Do not have a time when the rain began. It is raining as of this measurement time.
4/6/2019 7:30 AM 0.22 M M M M It rained throughout the day until sometime in the later afternoon-early evening.
4/7/2019 7:30 AM 0.01 M M M M
4/8/2019 7:30 AM 0.05 M M M M
4/9/2019 7:30 AM 0.02 M M M M A few drops occurred at 1719 with rain beginning at 1800. I don't know when it ended.
4/10/2019 7:30 AM 0.00 0.0 M M M
4/11/2019 7:30 AM 0.00 0.0 M M M
4/12/2019 7:30 AM 0.00 0.0 M M M
4/13/2019 7:30 AM 0.53 M M M M Fog reduced visibility to about 500' westward toward the river and perhaps about 1000' eastward.
4/14/2019 7:30 AM 0.00 0.0 M M M Fog about 5-10' above the ground about 1500' to the east.
4/15/2019 7:30 AM 0.60 M M M M Compare this reading with MD-MG-103, a 0.05" difference. This kind of difference hardly ever occurs. Very light rain began at 1806. However, directly across the Potomac River it was raining so hard I could not see the other side. This distance is 3750'. Usually when I see this occurrence, the rain hits us just as hard. It did not this time, but proceeded northward. The heavier rain did not begin until about 2000. During the rain but while it was still light, I could see sheets of rain at the neighbor's farm and in the back field, but not around the house. Lastly and although unofficial, the digital rain gauge, which is 8' due south of this location, recorded 0.70" rain! Heavy winds began at 0730 with gusts frequently over 20MPH.
4/16/2019 7:30 AM 0.00 0.0 M M M
4/17/2019 7:30 AM 0.00 0.0 M M M
4/18/2019 7:30 AM 0.00 0.0 M M M
4/19/2019 7:30 AM 0.00 0.0 M M M
4/20/2019 7:30 AM 1.48 M M M M Check out the rain reading for MD-MD-103. It is 0.07" more than this one.
4/21/2019 7:30 AM 0.00 0.0 M M M
4/22/2019 7:30 AM 0.00 0.0 M M M
4/23/2019 7:30 AM 0.00 0.0 M M M
4/24/2019 7:30 AM 0.00 0.0 M M M
4/25/2019 7:30 AM 0.00 0.0 M M M
4/26/2019 7:30 AM 0.26 M M M M
4/27/2019 7:30 AM 0.20 M M M M
4/28/2019 7:30 AM 0.05 M M M M
4/29/2019 7:45 AM 0.04 M M M M Measurement was taken at 0745 on 4/29 and recorded but never placed into CoCoRaHS.
4/30/2019 7:30 AM 0.00 0.0 M M M
5/1/2019 7:30 AM 0.03 M M M M
5/2/2019 7:30 AM 0.00 0.0 M M M Fog with visibility to ~750 feet.
5/3/2019 7:15 AM 0.19 M M M M Overcast.
5/4/2019 7:30 AM 0.42 M M M M There was lots of thunder and lightning, so much so I played the Strauss "Thunder and Lightning Polka".
5/5/2019 7:30 AM 0.50 M M M M It is raining very lightly.
5/6/2019 7:00 AM 1.04 M M M M
5/7/2019 7:30 AM 0.00 0.0 M M M
5/8/2019 7:15 AM 0.00 0.0 M M M
5/9/2019 7:00 AM 0.00 0.0 M M M
5/10/2019 7:20 AM T M M M M The rain was blowing from the SW.
5/11/2019 7:30 AM 0.88 M M M M There were two periods of rain: 1420-1510 - light at first then very heavy; 1950-2040 - very heavy.
5/12/2019 7:30 AM 0.34 M M M M After 1630, the rain would start, last for a few to several minutes, then stop.
5/13/2019 7:40 AM 0.61 M M M M It is raining lightly as I collected today's data. For the past 24 hours it has been raining.
5/14/2019 7:30 AM 0.70 M M M M It rained off-and-on all day.
5/15/2019 7:00 AM 0.00 0.0 M M M The rain is over! We have had 20.9" of rain so far this year.
5/16/2019 7:30 AM 0.03 M M M M
5/17/2019 7:30 AM 0.00 0.0 M M M
5/18/2019 7:30 AM 0.00 0.0 M M M
5/19/2019 7:30 AM 0.00 0.0 M M M
5/20/2019 7:30 AM 0.00 0.0 M M M
5/21/2019 7:00 AM 0.00 0.0 M M M
5/22/2019 7:30 AM 0.00 0.0 M M M
5/23/2019 7:30 AM 0.00 0.0 M M M
5/24/2019 7:00 AM 0.25 M M M M The storm on 5/24 came in at 1450 and was over at 1505. The max wind gust was 19MPH. There was only one tree that came down on our property.
5/25/2019 7:30 AM 0.00 0.0 M M M
5/26/2019 7:30 AM 0.17 M M M M Initially there was a light rain at 1735 for 5 minutes. They heavier rain occurred later. Time TBD later.
5/27/2019 7:30 AM 0.00 0.0 M M M It was predicted to rain yesterday night and it did not. Furthermore in the late afternoon and evening I heard thunder toward the south, however.
5/28/2019 7:30 AM 0.13 M M M M
5/29/2019 7:00 AM 0.00 0.0 M M M
5/30/2019 7:30 AM 0.00 0.0 M M M
5/31/2019 7:00 AM 0.08 M M M M There was a period of rain between 1510 and 1540, which was rather light and sporadic. There was no rain collected so it was a Trace for that period.
6/1/2019 7:30 AM 0.00 0.0 M M M
6/2/2019 7:30 AM 0.00 0.0 M M M
6/3/2019 7:30 AM 0.22 M M M M 1545-1610: a few drops now and then and here and there; 1750-1805: heavy rain with big drops, then it became lighter until it stopped. Compare these results with MD-MG-103, which recorded 0.04" less. This is understandable, because the rain was sporadic at times and in spots. This gauge is ~300+ feet NE of MD-MG-103.
6/4/2019 7:30 AM 0.00 0.0 M M M
6/5/2019 7:30 AM 0.00 0.0 M M M
6/6/2019 8:00 AM 0.01 0.0 M M M ERROR IN INITIAL 0730 REPORT. I failed to check the gauge and thought that it did not rain, until I saw my notes in my phone. It rained at three distinct periods: 1445-1455, 1550-1555 and 1625-1640. The drops were large, scattered and blew from the SW. Please check out MD-MG-103.
6/7/2019 7:30 AM 0.00 0.0 M M M
6/8/2019 7:30 AM 0.00 0.0 M M M
6/9/2019 7:30 AM 0.00 0.0 M M M
6/10/2019 7:30 AM 0.13 M M M M It has rained off and on all night.
6/11/2019 7:30 AM 0.25 M M M M Light rain, off-and-on nearly all day.
6/12/2019 7:30 AM 0.00 0.0 M M M
6/13/2019 7:30 AM 0.96 M M M M It was drizzling very lightly with a very, very fine misty spray. The heaviest rain for any five-minute period was 0.03" and in a few periods there was no recorded pptn.
6/14/2019 7:30 AM 0.37 M M M M It rained in the AM lightly till 1150, then it cleared up in the PM until the evening. At 1625 rain began again til 1745, dropping 0.19". There was thunder close by but not nearly overhead. Check MD-MG-103 readings with decreased rainfall in that location.
6/15/2019 7:30 AM 0.00 0.0 M M M Forgot to submit this report.
6/16/2019 7:30 AM 0.00 0.0 M M M
6/17/2019 7:30 AM 0.00 0.0 M M M
6/18/2019 7:30 AM 0.18 M M M M
6/19/2019 7:30 AM 0.06 M M M M REVISION: There were two periods of rain. The first was at 1255-1300 and the second was a blowing rain from the SW-W at 1456-1500.
6/20/2019 7:30 AM 0.02 M M M M A very light rain occurred between 1353 and 1434.
6/21/2019 7:15 AM 0.05 M M M M There were a few light sprinkles between 0850 and 0851. In the evening around 2100 there was some rain. NFI.
6/22/2019 7:30 AM 0.00 0.0 M M M
6/23/2019 7:30 AM 0.00 0.0 M M M
6/24/2019 7:30 AM 0.00 0.0 M M M
6/25/2019 7:30 AM 0.30 M M M M Rain began and stopped several times: 1438-1458, 1531-1420 and some time the in the early morning hours of 6/25/19.
6/27/2019 7:30 AM 0.00 0.0 M M M
6/28/2019 7:30 AM 0.02 M M M M Large drops began at 1744. This lasted for 10 min., then light rain continued till 1810. Distant thunder was heard before during and for many minutes after the rain stopped.
6/29/2019 7:10 AM 0.00 0.0 M M M
6/30/2019 7:30 AM 0.38 M M M M 1328-1332: a very light, blowing rain came from a dark cloud overhead that extended WSW. 1753: there was thunder across the Potomac River. I also saw rain coming down very briefly WNW and NW of my location. 1806: a deluge of rain came down in buckets, very, very fast and very heavy without any warning. It was also very windy. Visibility was down to about 750 feet due to the rain. At the same time the sun was shining due W through the rain. It all stopped at 1816. Electricity cut off-and-on several times, but did not stay off. 1821: I saw a rainbow due E towards Poolesville, MD. The very large rainbow arc spread from the N to the S.
7/1/2019 7:30 AM 0.00 0.0 M M M
7/2/2019 7:30 AM 0.00 0.0 M M M
7/3/2019 7:30 AM 0.20 M M M M The first rain was due to a dark cloud overhead at 1538, leaving a several big drops for about 10 minutes. Then the storm came in, albeit briefly. It came from WSW at two different times: 1610-55 depositing 0.09" and 1845-55 depositing 0.10".
7/4/2019 7:30 AM T M M M M At 2038 I felt a few drops of rain from a dark cloud overhead.
7/5/2019 6:15 AM 0.60 M M M M Rain began at 1406, but I know that it stopped in the early evening sometime. NFI, however. Very heavy fog this AM with visibility to ~500'.
7/6/2019 7:30 AM 0.00 0.0 M M M
7/7/2019 7:30 AM 0.13 M M M M 1815-1819: Thunder overhead, cloudy but no rain; 1821-1822: Trace of blowing rain; 1833: Steady rain; 1854-1906: More moderate and continuous rain; 2055-2110: Light rain and all evening there was occasional thunder.
7/8/2019 7:05 AM 1.45 M M M M - First between 2200 and 2240 depositing 0.65" and - At between 0635 and 0650 0.50". It stopped raining at 0650, then picked up at 0710, five minutes after I took today's reading. There was flooding.
7/9/2019 7:00 AM 0.74 M M M M The rain in a 24 hour period from late 8 July to PM 9 July was a total of 2.19" for this station only. Look at MD-MG-103 for slightly different results. Look at yesterday's revised observation notes and additional for additional information on the storm. The heaviest rain was between 0800 and 0820 leaving 0.24 inches. The rest of the rain was a result of 0.01" to 0.02" in certain 5 minute periods. There was flooding. White's Ferry has closed since yesterday due to debris on the Potomac River.
7/10/2019 7:30 AM 0.00 0.0 M M M There was 0.01" condensation due to dew in the gauge.
7/11/2019 7:00 AM 0.00 0.0 M M M
7/12/2019 7:15 AM 1.49 M M M M SKYWARN Report (MO-319). It began raining at 1349 very lightly, then at 1403 it came down very hard with visibility to about 1000'. This rain blew from the west and came in at a sharp angle. This lasted till 1415. At 1715 the rain came fast, hard and heavy. I could see it moving from the west very fast. Visibility again was reduced to ~1000'. It finally stopped with the last drops about 1820. The wind was also extremely forceful. (I don't yet have the data from my digital weather equipment due to technical issues.) Look at my other station MD-MG-103, as it has 1.33". There was massive River Road flooding and the farm fields were still flooded this morning. Once I have the data from the digital equipment, I'll correct this report. COMMENT: One reason why this gauge picked up more rain than MD-MG-103, is because as the force of the rain due to the wind came from the west, our house may have blocked that driving rain. The MD-MG-120 is in an open field.
7/13/2019 7:00 AM 0.00 0.0 M M M
7/14/2019 7:00 AM 0.00 0.0 M M M
7/17/2019 7:30 AM 0.00 0.0 M M M
7/18/2019 7:00 AM 0.50 M M M M Check MD-MG-103 on this property for 0.41" of rain. This gauge is about 180' NE from MD-MG-103. At 1643 a very intense thunderstorm approached from the W with very high winds - 30' pine trees were bending over 30-40 degrees from vertical. We lost a few branches and one 12"+ diameter black walnut came down.
7/19/2019 7:30 AM 0.00 0.0 M M M
7/20/2019 7:30 AM 0.00 0.0 M M M
7/21/2019 7:30 AM T 0.0 M M M I was outside at 2040-2045 and felt a few drops from the dark cloud overhead. This lasted for less than a few minutes. There was a lot of thunder toward the S and SSW.
7/22/2019 7:00 AM 0.04 M M M M There was very heavy winds between 1915 and 1945 - 15-22 MPH at 5-minute interval collection periods. There were a few large drops at first and very intermittently. Then about 1920 it was small drops, more evenly spread on the W side of the house, whereas on the E side it was far more sporadic. I could see rain from the W and SW across the Potomac River about 1900 and seemed to proceed more N than W than E, toward our house.
7/23/2019 7:00 AM 1.07 M M M M SKYWARN report submitted. There were two periods of heavy rain: (1) between 1450 and 1505 on 7/22 leaving 0.29"; 2) between 0055 and 0120 on 7/23 leaving 0.53". It was raining lightly at 0700 when I took this reading, however rain was not continuous all night just off and on. Check MD-MG-103 for 1.00" of rain.
7/24/2019 6:30 AM 0.07 M M M M The rain that occurred yesterday morning during the measurement stopped at ~0905.
7/25/2019 7:30 AM 0.01 M M M M A few rain drops from a large dark cloud covering our property and White's Ferry area.
7/26/2019 7:00 AM 0.00 0.0 M M M
7/27/2019 7:00 AM 0.00 0.0 M M M Fog limiting visibility to 500-750 feet.
7/28/2019 7:30 AM 0.00 0.0 M M M
7/29/2019 7:30 AM 0.00 0.0 M M M
7/30/2019 7:30 AM 0.00 0.0 M M M
7/31/2019 7:30 AM 0.03 M M M M A few scattered drops fell between 1842 and ~1910.
8/1/2019 7:00 AM 0.01 M M M M There were two brief periods of rain: 1410-1420, depositing 0.01" and 1611-1614 leaving only a Trace.
8/2/2019 7:30 AM 0.00 0.0 M M M
8/4/2019 7:30 AM 0.03 M M M M
8/5/2019 7:30 AM 0.00 0.0 M M M
8/6/2019 7:00 AM 0.00 0.0 M M M At 0615 there was fog limiting visibility to about 750 feet.
8/7/2019 7:30 AM 0.00 0.0 M M M
8/8/2019 7:15 AM 0.18 M M M M Thunderstorm with gusts of only 7MPH. Another instance of rain coming from the W with blowing winds. This allowed for more rain to be collected in the 120 gauge and less in the 103 gauge. Last night at 2035 we witnessed a sun pillar several minutes after the sunset. There was also a trace of rain about 1515.
8/9/2019 7:30 AM 0.01 M M M M
8/10/2019 7:30 AM 0.00 0.0 M M M
8/11/2019 7:30 AM 0.00 0.0 M M M
8/12/2019 7:00 AM 0.00 0.0 M M M At 0645 there was a very light fog close to the canal and Potomac River.
8/13/2019 7:00 AM 0.00 0.0 M M M
8/14/2019 7:00 AM 0.08 M M M M There were two periods of rain: 1054-1105 and after 2155.
8/15/2019 7:00 AM 0.00 0.0 M M M
8/16/2019 7:00 AM 0.10 M M M M There were two periods of rain: 1345-1507 when most of the rain fell; 2015-2017 when only a trace fell.
8/17/2019 7:00 AM 0.00 0.0 M M M
8/18/2019 7:00 AM 0.00 0.0 M M M
8/19/2019 7:00 AM 0.00 0.0 M M M In the afternoon then evening, there was a lot of thunderstorm and lightning activity to the N, S, W and E, but nothing came to this location. Again I believe like the local farmers that the Potomac River and the islands (perhaps) near this location have something to do with pushing the storms away from us.
8/20/2019 7:00 AM 0.01 M M M M Rain with thunder and lightning.
8/21/2019 7:00 AM 0.22 M M M M There were several periods of rain: 1735-1805: a few occasional sprinkles; 1835-1851: Lots of thunder to W and S, but no rain; 1844-1901: Rain began, very heavily, then it let up to a steady rain; Across the Potomac River (due W) rain was so heavy that I could not see the trees directly across the river in VA; 1914-1916: sprinkles; 1953-2000: light rain.
8/22/2019 7:00 AM 0.27 M M M M At 1626 I was in Poolesville, MD, when it began raining lightly. I left and it rained the whole way. At 1633 on White's Ferry Road at Edwards Ferry Road, It began to rain very heavily. At 1637 I was at this location and it was raining. Rain stopped at 1650 and the sun came out. Between 1726 and 1939, it rained very heavily, then the sun came out.
8/23/2019 7:00 AM 0.59 M M M M Between 1936 and 1941 large rain drops fell from a very large, overhead black cloud. Thunder and lightning was to the N and W. At 1952 very heavy rain came down with the whole sky (all around) being very gray. This lasted till about 2000.
8/24/2019 7:30 AM 0.15 M M M M
8/25/2019 7:00 AM 0.01 M M M M
8/26/2019 7:00 AM 0.00 0.0 M M M
8/27/2019 7:00 AM T M M M M
8/28/2019 7:00 AM 0.00 0.0 M M M
8/29/2019 7:00 AM 0.57 M M M M At 1436 as I looked W toward across the Potomac River, the tree line was obscured due to the heavy rain. Within 10 sec, I felt some light drops and in another few seconds it came down heavily. Compare this reading with MD-MG-120, which is in an open field. NOTE: For this location, when the rain comes heavily from the W, the house and tree tends to block the blowing rain.
8/30/2019 7:00 AM 0.02 0.0 M M M INITIAL REPORT: There was 0.02" water in the gauge, but I believe it may be due to the fog and high amount of water in the air. REVISED REPORT: The 0.02" of water was not due to dew/fog but actual pptn. I noticed yesterday that there were puddles of water where there should not be, so I am changing my report to reflect that observation.
8/31/2019 7:00 AM 0.00 0.0 M M M There was trace of water in the gauge, possibly due to condensation.
9/1/2019 7:00 AM 0.00 0.0 M M M Totally overcast this AM.
9/2/2019 7:00 AM 0.17 M M M M It came down straight (as opposed to blowing from the W) and heavily, then stopped.
9/3/2019 7:30 AM 0.05 M M M M There were two periods of brief rain: 1529-1535, lightly; 1603-1645. For the latter the drops initially came as large ones, then tapered back.
9/4/2019 7:00 AM 0.00 0.0 M M M
9/5/2019 7:00 AM 0.01 M M M M
9/6/2019 7:00 AM 0.00 0.0 M M M
9/7/2019 7:00 AM 0.00 0.0 M M M At 0600 there was dense fog with visibility to about 300'. By 0715 it had lifted to visibility to about 750'.
9/8/2019 7:00 AM 0.00 0.0 M M M
9/11/2019 7:00 AM 0.00 0.0 M M M
9/12/2019 7:00 AM T M M M M No rain in the gauge but at 1612-1613, several drops came down. I could see rain westward towards Purcellville, VA and beyond. It actually rained in Purcellville and Winchester, VA at about the same time.
9/13/2019 7:30 AM 0.01 M M M M
9/14/2019 7:00 AM 0.00 0.0 M M M
9/15/2019 7:30 AM 0.00 0.0 M M M The fog limited visibility to 300-500'.
9/16/2019 7:00 AM 0.00 0.0 M M M There was a low lying fog near River Road as it runs parallel to the canal.
9/17/2019 7:00 AM 0.00 0.0 M M M
9/18/2019 7:00 AM 0.00 0.0 M M M
9/19/2019 7:00 AM 0.00 0.0 M M M
9/20/2019 7:00 AM 0.00 0.0 M M M
9/21/2019 7:00 AM 0.00 0.0 M M M
9/22/2019 7:00 AM 0.00 0.0 M M M Fog
9/23/2019 7:00 AM 0.00 0.0 M M M
9/24/2019 7:00 AM 0.03 M M M M
9/25/2019 7:00 AM 0.00 0.0 M M M
9/26/2019 7:00 AM 0.00 0.0 M M M
9/29/2019 7:00 AM 0.00 0.0 M M M
9/30/2019 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
10/15/2018 10/16/2018 7:30 AM 2 0.17 M M
10/22/2018 10/23/2018 7:30 AM 2 0.05 M M
7/15/2019 7/16/2019 7:30 AM 2 0.00 M M
9/9/2019 9/10/2019 7:00 AM 2 0.00 M M
9/27/2019 9/28/2019 7:00 AM 2 0.00 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