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Severe Thunderstorm Watch 576
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WW0576 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Low Moderate
Severe Hail 2"+ Hail
Moderate Moderate

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 576
   NWS STORM PREDICTION CENTER NORMAN OK
   1000 AM MDT MON JUL 13 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHWEST NORTH DAKOTA
          CENTRAL SOUTH DAKOTA
   
   EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 1000 AM UNTIL
   400 PM MDT.
   
   HAIL TO 2 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 70 MILES NORTH
   NORTHEAST OF LEMMON SOUTH DAKOTA TO 40 MILES WEST OF CHAMBERLAIN
   SOUTH DAKOTA.  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.
   
   DISCUSSION...THREAT FOR ELEVATED SUPERCELLS CAPABLE OF PRODUCING
   LARGE HAIL WILL PERSIST INTO THE AFTERNOON ALONG AND JUST NE OF THE
   WARM FRONT IN ND/SD...WHERE LOW-LEVEL WAA AND ASCENT ARE FOCUSED IN
   ADVANCE OF A WEAK LEAD SHORTWAVE TROUGH.  BY MID AFTERNOON...THE WRN
   PORTIONS OF THE WATCH AREA WILL LIKELY BE REPLACED WITH A TORNADO
   WATCH TO REFLECT AN INCREASING TORNADO THREAT AS THE WARM FRONT
   LIFTS SLOWLY NEWD AND THE BOUNDARY LAYER DESTABILIZES.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 31020.
   
   
   ...THOMPSON
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Page last modified: July 13, 2009
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