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Severe Thunderstorm Watch 728
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WW0728 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
High Moderate
Severe Hail 2"+ Hail
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.
   SEL8
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 728
   NWS STORM PREDICTION CENTER NORMAN OK
   1235 PM EDT FRI AUG 21 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          DISTRICT OF COLUMBIA
          DELAWARE
          MARYLAND
          SOUTHERN NEW JERSEY
          CENTRAL AND EASTERN VIRGINIA
          COASTAL WATERS
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1235 PM UNTIL
   900 PM EDT.
   
   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 75
   STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH
   NORTHWEST OF DOVER DELAWARE TO 25 MILES WEST SOUTHWEST OF SOUTH
   HILL VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).
   
   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 726...WW 727...
   
   DISCUSSION...THUNDERSTORMS ARE DEVELOPING ALONG THE ERN SLOPES OF
   THE APPALACHIANS AND WILL SHIFT EWD THROUGH THE AFTERNOON. THE AIR
   MASS IS EXTREMELY MOIST...DEWPOINTS IN THE MID/UPPER 70S...AND 
   TEMPERATURES IN THE 90S ARE RESULTING IN MODERATE TO STRONG
   INSTABILITY. STRENGTHENING WINDS ALOFT AND 30-40 KT DEEP LAYER SHEAR
   WILL BE FAVORABLE FOR THUNDERSTORM LINES AND PERHAPS EVEN SOME
   SUPERCELL STRUCTURES...WITH WIND DAMAGE THE PRIMARY THREAT.
   
   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 500. MEAN STORM MOTION
   VECTOR 24025.
   
   
   ...IMY
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