

099 

WWUS20 KWNS 242249

SEL3

SPC WW 242249

PAZ000-250500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 533

NWS STORM PREDICTION CENTER NORMAN OK

645 PM EDT SAT JUL 24 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTH-CENTRAL AND NORTHEAST PENNSYLVANIA



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 645 PM

UNTIL 100 AM EDT.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 40 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 40 MILES NORTH NORTHWEST OF

STATE COLLEGE PENNSYLVANIA TO 25 MILES EAST NORTHEAST OF

WILKESBARRE 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 529...WW 530...WW

531...WW 532...



DISCUSSION...EARLIER EVOLVING MCS HAS NOW TRANSITIONED TO MORE OF A

DISCRETE MODE...INCLUDING SUPERCELLS.  WHILE LOW-LEVEL SHEAR IS NOT

PARTICULARLY STRONG...LATEST MODEL GUIDANCE SUGGESTS THAT A 30-40 KT

LLJ WILL DEVELOP ACROSS THE AREA THROUGH 25/03Z...SUSTAINING OR

PERHAPS ENHANCING THE SHEAR.  OTHERWISE...THE PRESENCE OF 1500-2000

J/KG MLCAPE AND 45-50 KT OF DEEP NWLY SHEAR WILL SUPPORT THE

CONTINUED POTENTIAL FOR SUPERCELLS WITH ATTENDANT THREATS FOR A

COUPLE TORNADOES IN ADDITION TO DAMAGING WINDS AND PERHAPS HAIL.



AVIATION...TORNADOES AND 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 28035.





...MEAD

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