SPC Severe Thunderstorm Watch 19
Fri, 25 Feb 2011 11:22:02 -0600
URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 19 NWS STORM PREDICTION CENTER NORMAN OK 1220 PM EST FRI FEB 25 2011 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF DISTRICT OF COLUMBIA DELAWARE THE EASTERN SHORE OF MARYLAND SOUTHERN NEW JERSEY EXTREME SOUTHEAST PENNSYLVANIA NORTHEAST VIRGINIA COASTAL WATERS EFFECTIVE THIS FRIDAY AFTERNOON FROM 1220 PM UNTIL 400 PM EST. HAIL TO 0.5 INCH 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 65 STATUTE MILES EAST AND WEST OF A LINE FROM PHILADELPHIA PENNSYLVANIA TO 5 MILES WEST SOUTHWEST OF PATUXENT RIVER MARYLAND. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9). 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. DISCUSSION...LOW-TOPPED CONVECTION IS GRADUALLY INCREASING WITHIN THE MIDLEVEL DRY SLOT...JUST IN ADVANCE OF AN EJECTING MIDLEVEL TROUGH AND A SURFACE COLD FRONT. SURFACE HEATING IN THE DRY SLOT AND RESIDUAL BOUNDARY LAYER DEWPOINTS IN THE MID 50S WILL SUPPORT SBCAPE NEAR 500 J/KG...WHILE STRONG WINDS JUST ABOVE THE SURFACE WILL FAVOR MOMENTUM TRANSFER TO THE GROUND AND DAMAGING WIND POTENTIAL WITH THE STRONGER LINE SEGMENTS/CELLS. ADDITIONALLY...THE STRONG LOW-LEVEL SHEAR COULD SUPPORT ROTATING STORMS...AND AN ISOLATED TORNADO CANNOT BE RULED OUT THIS AFTERNOON. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 300. MEAN STORM MOTION VECTOR 27045. ...THOMPSONRead more
SPC Severe Thunderstorm Watch 19 Status Reports
Fri, 25 Feb 2011 11:22:11 -0600
STATUS FOR WATCH 0019 HAS NOT BEEN ISSUED YETRead more
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