Station Overview Station Location
Station Number MD-CH-33 Latitude 38.64404
Station Name Waldorf 2.2 E Longitude -76.86389
County Charles Elevation (ft) 208



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 3.63 6.69 8 6.69 8 0.00 0 0 8 0 0.0 0 0
Nov 10 3.66 2.02 4 2.02 4 0.00 0 0 4 0 0.0 0 0
Dec 10 3.40 2.02 4 2.02 4 0.00 0 0 4 0 0.1 1 1
Jan 11 3.07 0.21 2 0.21 2 0.00 0 0 2 0 0.7 1 0
Feb 11 2.87 1.06 5 1.06 5 0.00 0 0 5 0 0.8 1 1
March 11 3.76 6.04 10 6.04 10 0.00 0 0 10 0 0.0 0 0
April 11 3.28 3.91 10 3.91 10 0.00 0 0 10 0 0.0 0 0
May 11 4.08 3.23 16 2.44 7 0.79 9 1 6 1 0.0 0 0
June 11 3.84 2.02 8 2.02 8 0.00 0 0 8 0 0.0 0 0
July 11 3.80 4.11 10 4.11 10 0.00 0 0 8 1 0.0 0 0
Aug 11 3.37 11.33 13 11.33 13 0.00 0 0 13 0 0.0 0 0
Sept 11 3.68 15.01 14 15.01 14 0.00 0 0 12 0 0.0 0 0
Water Year Totals: 42.44" 57.65" 104 days 56.86" 95 0.79" 9 days 1 90 days 2 days 1.6" 3 days 2 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 2.75
10/2/2010
10/3/2010
10/4/2010 0.79
10/5/2010 0.32
10/6/2010 0.02
10/7/2010
10/8/2010
10/9/2010
10/10/2010
10/11/2010
10/12/2010
10/13/2010
10/14/2010
10/15/2010 1.26
10/16/2010
10/17/2010
10/18/2010
10/19/2010
10/20/2010
10/21/2010 0.06
10/22/2010
10/23/2010
10/24/2010
10/25/2010
10/26/2010
10/27/2010 0.49
10/28/2010 1.00
10/29/2010
10/30/2010
10/31/2010
11/1/2010
11/2/2010
11/3/2010
11/4/2010
11/5/2010 0.75
11/6/2010 0.75
11/7/2010
11/8/2010
11/9/2010
11/10/2010
11/11/2010
11/12/2010
11/13/2010
11/14/2010
11/15/2010
11/16/2010
11/17/2010 0.50
11/18/2010
11/19/2010
11/20/2010
11/21/2010
11/22/2010
11/23/2010
11/24/2010 0.02
11/25/2010
11/26/2010
11/27/2010
11/28/2010
11/29/2010
11/30/2010
12/1/2010 0.06
12/2/2010 0.80
12/3/2010
12/4/2010
12/5/2010
12/6/2010
12/7/2010
12/8/2010
12/9/2010
12/10/2010
12/11/2010
12/12/2010 0.49
12/13/2010 0.67
12/14/2010
12/15/2010
12/16/2010
12/17/2010
12/18/2010
12/19/2010
12/20/2010
12/21/2010
12/22/2010
12/23/2010
12/24/2010
12/25/2010
12/26/2010
12/27/2010
12/28/2010
12/29/2010
12/30/2010
12/31/2010
Day of YearDaily PrcpMultiday Prcp
1/1/2011
1/2/2011 0.12
1/3/2011
1/4/2011
1/5/2011
1/6/2011
1/7/2011
1/8/2011
1/9/2011
1/10/2011
1/11/2011
1/12/2011 0.09
1/13/2011
1/14/2011
1/15/2011
1/16/2011
1/17/2011
1/18/2011
1/19/2011
1/20/2011
1/21/2011
1/22/2011
1/23/2011
1/24/2011
1/25/2011
1/26/2011
1/27/2011
1/28/2011
1/29/2011
1/30/2011
1/31/2011
2/1/2011
2/2/2011 0.64
2/3/2011
2/4/2011
2/5/2011
2/6/2011
2/7/2011
2/8/2011
2/9/2011
2/10/2011 0.08
2/11/2011
2/12/2011
2/13/2011
2/14/2011
2/15/2011
2/16/2011
2/17/2011
2/18/2011
2/19/2011
2/20/2011
2/21/2011
2/22/2011
2/23/2011
2/24/2011
2/25/2011 0.20
2/26/2011 0.10
2/27/2011
2/28/2011 0.04
3/1/2011 0.73
3/2/2011
3/3/2011
3/4/2011
3/5/2011
3/6/2011
3/7/2011 1.15
3/8/2011
3/9/2011
3/10/2011 0.75
3/11/2011 1.43
3/12/2011
3/13/2011
3/14/2011
3/15/2011
3/16/2011 0.82
3/17/2011
3/18/2011
3/19/2011
3/20/2011
3/21/2011 0.30
3/22/2011 0.27
3/23/2011 0.04
3/24/2011 0.42
3/25/2011
3/26/2011
3/27/2011
3/28/2011
3/29/2011
3/30/2011
3/31/2011 0.13
Day of YearDaily PrcpMultiday Prcp
4/1/2011 0.23
4/2/2011
4/3/2011 0.11
4/4/2011 0.01
4/5/2011 0.36
4/6/2011
4/7/2011
4/8/2011
4/9/2011
4/10/2011 0.40
4/11/2011
4/12/2011
4/13/2011 0.17
4/14/2011
4/15/2011
4/16/2011
4/17/2011 1.12
4/18/2011
4/19/2011
4/20/2011
4/21/2011
4/22/2011
4/23/2011 0.50
4/24/2011
4/25/2011 0.69
4/26/2011
4/27/2011
4/28/2011
4/29/2011 0.32
4/30/2011
5/1/2011
5/2/2011
5/3/2011
5/4/2011 0.67
5/5/2011 0.19
5/6/2011
5/7/2011 0.06
5/8/2011 T
5/9/2011 0.01
5/10/2011
5/11/2011
5/12/2011
5/13/2011
5/14/2011
5/15/2011 1.20
5/16/2011 0.31
5/17/2011 **
5/18/2011 **
5/19/2011 **
5/20/2011 **
5/21/2011 **
5/22/2011 **
5/23/2011 **
5/24/2011 **
5/25/2011 0.79
5/26/2011
5/27/2011
5/28/2011
5/29/2011
5/30/2011
5/31/2011
6/1/2011
6/2/2011
6/3/2011
6/4/2011
6/5/2011 0.02
6/6/2011
6/7/2011
6/8/2011
6/9/2011
6/10/2011 0.41
6/11/2011
6/12/2011 0.03
6/13/2011
6/14/2011
6/15/2011
6/16/2011
6/17/2011 0.83
6/18/2011 0.20
6/19/2011
6/20/2011 0.24
6/21/2011 0.20
6/22/2011
6/23/2011
6/24/2011
6/25/2011
6/26/2011
6/27/2011
6/28/2011
6/29/2011 0.09
6/30/2011
Day of YearDaily PrcpMultiday Prcp
7/1/2011
7/2/2011
7/3/2011 0.69
7/4/2011 0.03
7/5/2011
7/6/2011
7/7/2011 0.03
7/8/2011 0.00
7/9/2011 1.89
7/10/2011
7/11/2011
7/12/2011 0.03
7/13/2011
7/14/2011 0.62
7/15/2011
7/16/2011
7/17/2011
7/18/2011
7/19/2011
7/20/2011 0.04
7/21/2011
7/22/2011
7/23/2011 T
7/24/2011
7/25/2011
7/26/2011 0.78
7/27/2011
7/28/2011
7/29/2011
7/30/2011
7/31/2011
8/1/2011
8/2/2011
8/3/2011
8/4/2011 0.23
8/5/2011
8/6/2011
8/7/2011 0.07
8/8/2011 0.07
8/9/2011
8/10/2011 0.42
8/11/2011
8/12/2011
8/13/2011
8/14/2011 2.30
8/15/2011 0.39
8/16/2011 0.13
8/17/2011
8/18/2011
8/19/2011 0.11
8/20/2011 0.24
8/21/2011
8/22/2011 0.06
8/23/2011
8/24/2011
8/25/2011
8/26/2011 0.45
8/27/2011 0.02
8/28/2011 6.84
8/29/2011
8/30/2011
8/31/2011
9/1/2011
9/2/2011 0.20
9/3/2011
9/4/2011
9/5/2011 0.00
9/6/2011 1.45
9/7/2011 0.92
9/8/2011 7.83
9/9/2011 1.73
9/10/2011 0.22
9/11/2011
9/12/2011 0.00
9/13/2011
9/14/2011
9/15/2011
9/16/2011 0.03
9/17/2011
9/18/2011
9/19/2011
9/20/2011
9/21/2011 0.22
9/22/2011
9/23/2011
9/24/2011 1.88
9/25/2011 0.02
9/26/2011
9/27/2011
9/28/2011 0.02
9/29/2011 0.49
9/30/2011



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/1/2010 7:00 AM 2.75 M M M M
10/4/2010 7:00 AM 0.79 M M M M
10/5/2010 7:00 AM 0.32 M M M M
10/6/2010 7:00 AM 0.02 M M M M
10/15/2010 7:00 AM 1.26 M M M M
10/21/2010 7:00 AM 0.06 M M M M
10/27/2010 7:00 AM 0.49 M M M M
10/28/2010 7:00 AM 1.00 M M M M Strong afternoon ++TSRA moved across Waldorf with meso-circulation. Was at WWB at the time but from radar reflectivity estimate about .90 fell in a 15 minute period.
11/5/2010 7:00 AM 0.75 M M M M
11/6/2010 7:00 AM 0.75 M M M M
11/17/2010 7:00 AM 0.50 M M M M Fast moving line of +SHRA after midnight possible thunder.
11/24/2010 7:00 AM 0.02 M M M M
12/1/2010 7:00 AM 0.06 M M M M
12/2/2010 7:00 AM 0.80 M M M M
12/12/2010 7:00 AM 0.49 M M M M
12/13/2010 7:00 AM 0.67 0.1 M 0.1 M Steady rain afternoon of 12th ended as a dusting of snow. about .1 inch of new snow...the first of the season.
1/2/2011 7:00 AM 0.12 M M M M
1/12/2011 7:00 AM 0.09 0.7 M M M
2/2/2011 7:00 AM 0.64 M M M M
2/10/2011 7:00 AM 0.08 0.8 M 0.7 M
2/25/2011 7:00 AM 0.20 M M M M
2/26/2011 7:00 AM 0.10 M M M M
2/28/2011 7:00 AM 0.04 M M M M
3/1/2011 7:00 AM 0.73 M M M M TSRA followed by periods of light to moderate rain
3/7/2011 7:00 AM 1.15 M M M M
3/10/2011 7:00 AM 0.75 M M M M
3/11/2011 7:00 AM 1.43 M M M M
3/16/2011 7:00 AM 0.82 M M M M Period of heavy rain after midnight-most fell in two hours
3/21/2011 7:00 AM 0.30 M M M M Surprise TSTM OCNL LTGIC brief Mdt/hvy RA mostly 7-8 AM from elevated mid level instabilty and fast moving MCS along warm front
3/22/2011 7:00 AM 0.27 M M M M Second round of storms evening
3/23/2011 7:00 AM 0.04 M M M M
3/24/2011 7:00 AM 0.42 M M M M
3/31/2011 7:00 AM 0.13 M M M M
4/1/2011 7:00 AM 0.23 M M M M
4/3/2011 7:00 AM 0.11 M M M M TSRAGR...Neighbor said shower of small hail began to whiten the ground. Two TSRAGR at World Weather Building Saturday...one even mixed with snow after temps near 50
4/4/2011 7:00 AM 0.01 M M M M Mid level evening -TSRA 8-9PM ahead of warm front. Fairly frequent in cloud lightning SW and N-E for so little moisture.
4/5/2011 7:00 AM 0.36 M M M M Intense but brief +TSRA Pre-frontal at 4:30AM
4/10/2011 7:00 AM 0.40 M M M M
4/13/2011 7:00 AM 0.17 M M M M
4/17/2011 7:00 AM 1.12 M M M M Period of moderate to heavy rain and embedded thunder mid to late afternoon....0.97" Second brief storm with cold front later in eve....0.15"
4/23/2011 7:00 AM 0.50 M M M M periods of light to briefly moderate rain
4/25/2011 7:00 AM 0.69 M M M M Several brief +TSRAs.... most organized from Upper Marlboro to Clinton to Ft Belvoir where 1.5 to 2 inches fell in a narrow band.
4/29/2011 7:00 AM 0.32 M M M M Brief late morning +TSRA ahead of cold front. other showes followed later in the afternoon
5/4/2011 7:00 AM 0.67 M M M M
5/5/2011 7:00 AM 0.19 M M M M
5/7/2011 7:00 AM 0.06 M M M M Brief spurt of big drops jst E of Rt 301
5/8/2011 7:00 AM T M M M M
5/9/2011 7:00 AM 0.01 M M M M Eve SHRA.
5/15/2011 7:00 AM 1.20 M M M M Brief +SHRA midday 0.21: +TSRA evening 0.99. the max precip cores were 1-2 miles east of here with both events.
5/16/2011 7:00 AM 0.31 M M M M TSRA to S-SE early eve; cell that formed on backside of this gave the .31".
6/5/2011 7:00 AM 0.02 M M M M On edge of Scattered brief heavy showers pre-dawn-closest to W
6/10/2011 7:00 AM 0.41 M M M M Brief +TSRA after midnight...FQT LTGIC OCNL LTGCG
6/12/2011 7:00 AM 0.03 M M M M Anvil Rain on back edge of +TSRA Hughesville area, 8 miles to the SE
6/17/2011 7:00 AM 0.83 M M M M +TSRA early eve S Central Charles County; also late eve farther N...big max in Port Tobacco area
6/18/2011 7:00 AM 0.20 M M M M brief +TSRA 6:40 PM cell motion 290/25 but area propagated to the NE into PG County. Other brief showers....total 0.20"
6/20/2011 7:00 AM 0.24 M M M M
6/21/2011 7:00 AM 0.20 M M M M
6/29/2011 7:00 AM 0.09 M M M M Anvil rain, deep rumbling thunder, and LTGIC as main early evening storm shifted from Stafford CO VA to well S of Charles County.
7/3/2011 7:00 AM 0.69 M M M M TSRA OCNLY +TSRA...ocasional LTGIC and loud rolling thunder. A real blessing from heaven for our parched lawns...most rain fell 5-6AM.
7/4/2011 7:00 AM 0.03 M M M M Storms Skirted my area-lots of thunder, not much rain
7/7/2011 7:00 AM 0.03 M M M M
7/8/2011 7:00 PM 0.00 0.0 M M M Second observation taken from Waldorf Festival Shopping Center 2.3 WSW of main location. 1.40 fell there 5:37-6:00, .14 next 20 min. est .05 thereafter totals there 1.59
7/9/2011 7:00 AM 1.89 M M M M
7/12/2011 7:00 AM 0.03 M M M M Storms split around here with lots of in-cloud lightning, thunder and wind gusts to 40MPH+ but only .03 rain
7/14/2011 7:00 AM 0.62 M M M M Afternoon +TSRA moving SSE centered W-SW of station.
7/20/2011 7:00 AM 0.04 M M M M Sctd TSRA in evening
7/23/2011 7:00 PM T M M M M Small but active thunderstorm popped up 6:30-7:30 over the Ft Washington area of Prince Georges County. Despite it being ony 2-3 miles in diameter, it dropped .50 to 1.00 rainfall over a very small area according to LWX Storm Total Precip. It drifted E and died only about 5 miles from its point of origin. Only a Trace of Rain here.
7/26/2011 7:00 AM 0.78 M M M M Smal Max nearby on Radar Storm Total. Obs Taken by friend while I was away.
8/4/2011 7:00 AM 0.23 M M M M
8/7/2011 7:00 AM 0.07 M M M M
8/8/2011 7:00 AM 0.07 M M M M
8/10/2011 7:00 AM 0.42 M M M M Heavy showers across Nrn Charles centered just S. No thunder heard
8/14/2011 7:00 AM 2.30 M M M M late aftn shower .10". Series of ++TSRA pre dawn. OCNL LTGIC, gave another 2.10" as they trained up or just W of route 301 from La Plata towards Upper Marlboro untimately maxing out with 3-4" in Srn Anne Arundel County
8/15/2011 7:00 AM 0.39 M M M M AM shower. Missed later activity that got DCA during the evening.
8/16/2011 7:00 AM 0.13 M M M M TS SW at 1PM; area of +++TSRA that clobbered Upper Marlboro passes just to east lare afternoon. Brief heavy shower on lefftover outflow boundary around 8PM.
8/19/2011 7:00 AM 0.11 M M M M Evening Storms N-NW.....Pre-dawn Storms To S
8/20/2011 7:00 AM 0.24 M M M M Lots of thunder during eve. Storms To the N fizzled; Line to N weakened before it ever got here.
8/22/2011 7:00 AM 0.06 M M M M Southern end of line fell apart...Big storms with lots of lightning N central DC
8/26/2011 7:00 AM 0.45 M M M M .39" in brief heavy showers...thunder S 6PM. Overnight showers .06"
8/27/2011 7:00 AM 0.02 M M M M
8/28/2011 7:00 AM 6.84 M M M M Hurricane Irene prolonged banded moderate to heavy rain
9/2/2011 7:00 AM 0.20 M M M M Surprise brief +TSRA Pre-Dawn
9/5/2011 7:00 AM 0.00 0.0 M M M Showers in area-none here yet
9/6/2011 7:00 AM 1.45 M M M M
9/7/2011 7:00 AM 0.92 M M M M
9/8/2011 7:00 AM 7.83 M M M M +TSRA during late morning 2.92". Early eve showers 0.16. After 4.00" in series of ++TSRA mostly 9PM-2AM, another .75 in +TSRA 5:30AM. Heaviest 1 day total I can remember.
9/9/2011 7:00 AM 1.73 M M M M
9/10/2011 7:00 AM 0.22 M M M M Over a foot of rain...12.15...for the past 4 days
9/12/2011 7:00 AM 0.00 0.0 M M M
9/16/2011 7:00 AM 0.03 M M M M
9/21/2011 7:00 AM 0.22 M M M M
9/24/2011 7:00 AM 1.88 M M M M
9/25/2011 7:00 AM 0.02 M M M M
9/28/2011 7:00 AM 0.02 M M M M
9/29/2011 7:00 AM 0.49 M M M M EVE TSRA heavier a short disitance W-N



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
5/17/2011 5/25/2011 12:00 AM 9 0.79 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