WATCHES: Severe Thunderstorm Watch Number 301

WWUS20 KWNS 272043
SEL1
SPC WW 272043
DCZ000-MDZ000-VAZ000-WVZ000-CWZ000-280200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 301
NWS STORM PREDICTION CENTER NORMAN OK
445 PM EDT SUN MAY 27 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

DISTRICT OF COLUMBIA
CENTRAL MARYLAND
NORTHERN VIRGINIA
EASTERN WEST VIRGINIA PANHANDLE
COASTAL WATERS

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 445 PM UNTIL
1000 PM EDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH
SOUTHWEST OF MARTINSBURG WEST VIRGINIA TO 25 MILES EAST SOUTHEAST
OF BALTIMORE MARYLAND. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 300...

DISCUSSION...CLUSTER OF STRONG THUNDERSTORMS OVER NORTHERN VA MAY
PERSIST FOR SEVERAL HOURS AND TRACK SLOWLY EASTWARD ACROSS
DC/BALTIMORE METRO AREAS. TEMPERATURES NEAR 90F HAVE RESULTED IN
STEEP LOW LEVEL LAPSE RATES AND MUCAPE VALUES OVER 2500 J/KG.
ISOLATED CELLS IN THIS AREA MAY POSE A THREAT OF DAMAGING WINDS AND
HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27025.

..HART

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