Tornado Watch (Delaware, Maryland, New Jersey, New York, Pennsylvania, Coastal Waters)

URGENT – IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 643
NWS STORM PREDICTION CENTER NORMAN OK
1210 PM EDT TUE SEP 18 2012

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

DELAWARE
EASTERN MARYLAND
NEW JERSEY
FAR SOUTHEAST NEW YORK
EASTERN PENNSYLVANIA
COASTAL WATERS

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1210 PM UNTIL
700 PM EDT.

TORNADOES…HAIL TO 0.5 INCH IN DIAMETER…THUNDERSTORM WIND
GUSTS TO 70 MPH…AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH OF MONTICELLO
NEW YORK TO 30 MILES WEST SOUTHWEST OF PHILADELPHIA PENNSYLVANIA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU3).

REMEMBER…A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION…CONTINUE…WW 641…WW 642…

DISCUSSION…FORCED BAND OF CONVECTION OVER CNTRL PA IS EXPECTED TO
INTENSIFY THIS AFTERNOON WITH ADDITIONAL MORE DISCRETE STORM
DEVELOPMENT POSSIBLE FARTHER E NEARER TO THE ATLANTIC COAST.
WIDESPREAD CLOUDS AND PRECIPITATION WILL LIMIT THE DEGREE OF AIR
MASS DESTABILIZATION. HOWEVER…GIVEN THE VERY MOIST
ENVIRONMENT…SUFFICIENT INSTABILITY WILL DEVELOP TO SUPPORT TSTMS.
AS BOTH VERTICAL SHEAR AND FORCING FOR ASCENT CONTINUE TO INCREASE
THROUGH THE AFTERNOON…EXPECT A CORRESPONDING ORGANIZATION OF
STORMS INTO LEWP/BOW STRUCTURES AND POSSIBLY SUPERCELLS CAPABLE OF
TORNADOES AND DAMAGING WINDS.

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Posted on September 18, 2012, in Delaware, Maryland, New Jersey, New York, Pennsylvania and tagged , , , , , . Bookmark the permalink. Leave a comment.

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