THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF DISTRICT OF COLUMBIA WESTERN AND CENTRAL MARYLAND CENTRAL PENNSYLVANIA NORTHERN VIRGINIA EASTERN WEST VIRGINIA PANHANDLE COASTAL WATERS * EFFECTIVE THIS THURSDAY MORNING FROM 400 AM UNTIL 1100 AM EDT. * PRIMARY THREATS INCLUDE... SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE A FEW TORNADOES POSSIBLE THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES WEST NORTHWEST OF WILLIAMSPORT PENNSYLVANIA TO 40 MILES SOUTHWEST OF WASHINGTON DISTRICT OF COLUM. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3). PRECAUTIONARY/PREPAREDNESS ACTIONS... 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 302... DISCUSSION...THE NORTHERN FLANK OF A STRONG/SEVERE MESOSCALE CONVECTIVE SYSTEM IS GENERALLY MAINTAINING STRENGTH ACROSS THE UPPER OHIO VALLEY. ACTIVITY IS EXPECTED TO CONTINUE EASTWARD ALONG A WARM FRONTAL ZONE ACROSS THE ALLEGHENIES THROUGH MUCH OF CENTRAL PENNSYLVANIA BY MID MORNING...WITH A RISK FOR POTENTIALLY DAMAGING WIND GUSTS. WHILE THE SOUTH END OF THE CONVECTIVE SYSTEM HAS BEEN WEAKER...POTENTIAL EXISTS FOR THE ASSOCIATED OUTFLOW BOUNDARY TO SUPPORT NEW STRONG/SEVERE STORM DEVELOPMENT AS IT ADVANCES ACROSS THE ALLEGHENIES AND BLUE RIDGE...INTO AN UNSTABLE ENVIRONMENT ACROSS THE WASHINGTON D.C./BALTIMORE AREA BY 11-13Z. 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 28040. ...KERR
Posted on: Thu, 13 Jun 2013 08:05:24 +0000
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