Friday, May 29, 2009

DC Region Rain Reign Remains

Image (click to enlarge): Monthly precipitation percentage of average as of 8 am May 29 from National Weather Service

May 31 correction: May 2009 is the 6th wettest in Washington.

6:30 pm Update: The additional 0.32" at Washington National since 5:00 puts this May past 1989 into 6th place.

6 pm Update: Additional amounts in the past hour:
Washington National 0.06"
Washington Dulles 0.36"
Baltimore (BWI) Trace
Original post:
Continuing thundershowers this afternoon have added to the already soggy May rainfall totals in the Washington, DC region. Month-to-date totals through 8 am this morning were already above 150% of average for the District of Columbia and much of adjacent Maryland and Virginia. Amounts have been particularly high in southern Montgomery County, MD and northern Fairfax County, VA, where some places (dark blue on the map) reached 200-300% of average before today's additional downpours.

As of 5 pm, daily and monthly totals were:
Washington National 0.43"/7.47"
Washington Dulles 0.40"/9.90"
Baltimore (BWI) 0.89"/8.00"
The total at National now makes this May in the 7th wettest in Washington history.

Here are some rainfall amounts from Thursday's storms reported by the National Weather Service:
********************STORM TOTAL RAINFALL********************  

LOCATION STORM TOTAL TIME/DATE COMMENTS
RAINFALL OF
(INCHES) MEASUREMENT

MARYLAND

..MONTGOMERY COUNTY

BARNESVILLE 1.42 615 PM 5/28 LOCAL MESONET
DAMASCUS 1.01 615 PM 5/28 LOCAL MESONET
MONTGOMERY CTY 0.74 555 PM 5/28 AWOS-METAR

VIRGINIA

..AUGUSTA COUNTY

CHAPIN 2W 1.50 613 PM 5/28 IFLOWS-ELLIOTS KNOB

..FAIRFAX COUNTY

WASH DC/DULLES ARPT 1.00 452 PM 5/28 METAR
HERNDON 0.79 530 PM 5/28 LOCAL MESONET

..FREDERICK COUNTY

GAINESBORO 1.88 500 PM 5/28 LOCAL MESONET

..LOUDOUN COUNTY

STERLING 0.75 600 PM 5/28 LOCAL MESONET

WEST VIRGINIA

..HAMPSHIRE COUNTY

CAPON BRIDGE 1.14 330 PM 5/28 LOCAL MESONET

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