

287 

WWUS20 KWNS 012207

SEL6

SPC WW 012207

PAZ000-020400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 336

NWS STORM PREDICTION CENTER NORMAN OK

605 PM EDT FRI JUN 1 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND NORTHERN PENNSYLVANIA



EFFECTIVE THIS FRIDAY NIGHT FROM 605 PM UNTIL MIDNIGHT 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 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES EAST NORTHEAST OF

BRADFORD PENNSYLVANIA TO 35 MILES EAST SOUTHEAST OF STATE COLLEGE

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 332...WW 333...WW

334...WW 335...



DISCUSSION...PRE-COLD FRONTAL SQLN NOW NEARING JST EXPECTED TO

CONTINUE MOVING STEADILY ENEWD THROUGH TNGT...WHILE EMBEDDED

STORMS/CIRCULATIONS MOVE RAPIDLY NNEWD ALONG IT.  SATELLITE AND VWP

DATA SHOW UPR LVL SHORTWAVE TROUGH AMPLIFYING OVER OH ATTM.  THIS

SHOULD FOSTER STRENGTHENING OF DOWNSTREAM S TO SWLY 850-700 MB FLOW

ACROSS CNTRL/ERN PA DURING THE NEXT FEW HRS.  COUPLED WITH

ASSOCIATED INCREASE IN LARGE SCALE FORCING FOR ASCENT...SETUP MAY

SUPPORT NNEWD DEVELOPMENT OF SQLN INTO N CNTRL PA.  GIVEN STRENGTH

OF WIND FIELD AND FORCED UPLIFT ALONG SQLN...EMBEDDED STORMS MAY

POSE A RISK FOR LOCALLY DMGG WIND/BRIEF TORNADOES DESPITE WEAK

LOW-LVL BUOYANCY.



AVIATION...TORNADOES AND 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

400. MEAN STORM MOTION VECTOR 20040.





...CORFIDI

