Friday, November 1, 2013

WATCHES: Severe Thunderstorm Watch Number 559

WWUS20 KWNS 011026
SEL9
SPC WW 011026
NJZ000-PAZ000-011500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 559
NWS STORM PREDICTION CENTER NORMAN OK
625 AM EDT FRI NOV 1 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHWEST NEW JERSEY
SOUTHEAST AND EAST-CENTRAL PENNSYLVANIA

* EFFECTIVE THIS FRIDAY MORNING FROM 625 AM UNTIL 1100 AM EDT.

* PRIMARY THREATS INCLUDE...
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50
STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES SOUTHEAST OF
PHILADELPHIA PENNSYLVANIA TO 40 MILES NORTH OF ALLENTOWN
PENNSYLVANIA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 558...

DISCUSSION...A FORCED LINE OF CONVECTION OVER CENTRAL PENNSYLVANIA
IS EXPECTED TO RAPIDLY MOVE EAST ACROSS THE WATCH AREA THIS MORNING
AT 40-50 KT. WHILE INSTABILITY WILL REMAIN QUITE LIMITED...THE
PRESENCE OF A VERY STRONG WIND FIELD WILL SUPPORT THE POTENTIAL FOR
CORRIDORS OF WIND DAMAGE WITH THE PASSAGE OF THE LINE.

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 250. MEAN STORM
MOTION VECTOR 24045.


...MEAD

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