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Severe Thunderstorm Watch 20
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WW0020 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Very Low Very 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.
   SEL0
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 20
   NWS STORM PREDICTION CENTER NORMAN OK
   830 AM EST WED JAN 30 2013
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          WESTERN MARYLAND PANHANDLE
          SOUTHEAST OHIO
          SOUTHWEST PENNSYLVANIA
          WESTERN VIRGINIA
          WEST VIRGINIA
   
   EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 830 AM UNTIL
   400 PM EST.
   
   HAIL TO 1 INCH 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 45 MILES SOUTHWEST OF
   DUBLIN VIRGINIA TO 15 MILES NORTH OF PITTSBURGH PENNSYLVANIA. 
   FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU0).
   
   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 14...WW 16...WW 17...WW
   18...WW 19...
   
   DISCUSSION...NRN EXTENSION OF QLCS OVER THE UPPER OH VALLEY IS
   EXPECTED TO PROGRESS EWD ACROSS THE WATCH AREA THIS MORNING INTO
   EARLY AFTERNOON.  12Z OBSERVED SOUNDINGS AND ABSENCE OF LIGHTNING
   INDICATE THAT AMBIENT AIR MASS IS ONLY MARGINALLY UNSTABLE...AND
   CONVECTION IS QUITE SHALLOW.  NONETHELESS...INTENSE FORCING FOR
   ASCENT AND VERTICAL SHEAR ARE EXPECTED TO MAINTAIN THE CONVECTIVE
   SYSTEM WITH AN ATTENDANT RISK FOR PRIMARILY DAMAGING WIND GUSTS.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
   A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 300. MEAN STORM MOTION
   VECTOR 22045.
   
   
   ...MEAD
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Page last modified: January 30, 2013
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