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.
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