Nelson County, Virginia
! EXPIRED – EXPIRED – EXPIRED !
URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 173
NWS STORM PREDICTION CENTER NORMAN OK
230 PM EDT FRI MAY 14 2010
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
DISTRICT OF COLUMBIA
MUCH OF MARYLAND
PARTS OF SOUTHEAST OHIO
MUCH OF SOUTHERN PENNSYLVANIA
NORTHERN VIRGINIA
MUCH OF WEST VIRGINIA
COASTAL WATERS
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 230 PM UNTIL 900
PM EDT.
HAIL TO 2.5 INCHES IN DIAMETER…THUNDERSTORM WIND GUSTS TO 80
MPH…AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 90
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST
NORTHWEST OF CHARLESTON WEST VIRGINIA TO 45 MILES SOUTHEAST OF
HARRISBURG PENNSYLVANIA. FOR A COMPLETE DEPICTION OF THE WATCH
SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
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 170…WW 171…WW 172…
DISCUSSION…THUNDERSTORMS ARE EXPECTED TO INCREASE IN NUMBER AND
INTENSITY ACROSS THE WATCH THRU THE AFTERNOON AS AIR MASS HAS BECOME
MODERATELY UNSTABLE.40-50KT OF SHEAR COUPLED WITH MID LEVEL LAPSE
RATES OF 7C/KM SUPPORT BOTH LARGE HAIL AND DAMAGING WINDS. GREATEST
WIND THREAT WILL BE WITH ANY LINE SEGMENT/BOW ECHOES THAT DEVELOP IN
THE STRONG FLOW ALOFT.
AVIATION…A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 26035.
