

600 

WWUS20 KWNS 072216

SEL9

SPC WW 072216

DEZ000-MDZ000-NJZ000-PAZ000-CWZ000-080400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 479

NWS STORM PREDICTION CENTER NORMAN OK

615 PM EDT SAT JUL 7 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN DELAWARE

       NORTHERN MARYLAND

       NEW JERSEY

       CENTRAL AND SOUTHERN PENNSYLVANIA

       COASTAL WATERS



EFFECTIVE THIS SATURDAY NIGHT FROM 615 PM UNTIL MIDNIGHT EDT.



HAIL TO 1.5 INCHES 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 50

STATUTE MILES EITHER SIDE OF A LINE FROM 30 MILES NORTHWEST OF

ALTOONA PENNSYLVANIA TO 30 MILES SOUTH SOUTHEAST OF LAKEHURST NEW

JERSEY.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 477...WW 478...



DISCUSSION...SCTD TSTMS...INCLUDING A FEW SUSTAINED STORMS/POSSIBLE

SUPERCELLS WITH SMALL BOWS...EXPECTED TO CONTINUE MOVING/DEVELOPING

GENERALLY ESE TOWARD NRN MD/NRN DE AND SOUTH JERSEY AHEAD OF DIFFUSE

COLD FRONT.  ACTIVITY WILL BE SUPPORTED BY RELATIVELY STEEP LOW LVL

LAPSE RATES SE OF CURRENT STORMS...AND CONTINUED LOW LVL THEA-E

ADVECTION OVER WATCH AREA.  A FEW STORMS MAY BACK-BUILD WNW ALONG

THE FRONT IN CNTRL PA.  THREAT AREA WILL BE ALONG SRN FRINGE OF 40+

KT MID LVL WNW JET STREAK...FURTHER SUPPORTING RISK FOR DMGG WIND

AND PSBLY HAIL.



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 31035.





...CORFIDI

