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Severe Thunderstorm Watch 246
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WW0246 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL6
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 246
   NWS STORM PREDICTION CENTER NORMAN OK
   1145 PM EDT WED APR 27 2011
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          CENTRAL PENNSYLVANIA
   
   EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1145 PM
   UNTIL 700 AM 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 60
   STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH
   NORTHWEST OF WILLIAMSPORT PENNSYLVANIA TO 10 MILES SOUTH
   SOUTHEAST OF HAGERSTOWN MARYLAND.  FOR A COMPLETE DEPICTION OF
   THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS
   WOU6).
   
   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 238...WW 239...WW
   240...WW 241...WW 242...WW 244...WW 245...
   
   DISCUSSION...TSTMS HAVE RECENTLY INCREASED IN COVERAGE AND INTENSITY
   OVER CNTRL PA ALONG WRN EDGE OF MORE MOIST BOUNDARY LAYER
   CHARACTERIZED BY DEWPOINTS IN THE MID/UPPER 60S AND MLCAPE VALUES OF
   500-1000 J/KG.  CURRENT STATE COLLEGE VWP IS SHOWING RATHER STRONG
   LOW AND DEEP-LAYER SHEAR...SUPPORTIVE OF SUPERCELLS AND BOWING
   STRUCTURES CAPABLE OF DAMAGING WINDS AND HAIL.  A BRIEF TORNADO
   REMAINS POSSIBLE...THOUGH THE GRADUALLY COOLING AIR MASS AND
   RESULTANT CIN ACCUMULATION WILL PROHIBIT A MORE ROBUST THREAT.
   
   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 22040.
   
   
   ...MEAD
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Page last modified: April 28, 2011
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