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Severe Thunderstorm Watch 583
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WW0583 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.
   SEL3
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 583
   NWS STORM PREDICTION CENTER NORMAN OK
   240 PM CDT TUE JUL 14 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHWEST IOWA
          SOUTHWEST AND CENTRAL MINNESOTA
          EXTREME NORTHEAST NEBRASKA
          EASTERN SOUTH DAKOTA
   
   EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 240 PM UNTIL
   900 PM CDT.
   
   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 70
   STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES NORTH
   NORTHEAST OF ALEXANDRIA MINNESOTA TO 30 MILES SOUTHEAST OF
   YANKTON SOUTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE
   THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
   
   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...THUNDERSTORMS ARE DEVELOPING ALONG THE SURFACE COLD
   FRONT AND A PRE-FRONTAL TROUGH ACROSS ERN SD...AND THIS ACTIVITY
   WILL LIKELY INCREASE IN COVERAGE/INTENSITY THROUGH THE AFTERNOON
   WHILE SPREADING EWD.  TIME SERIES OF LOCAL PROFILERS AND VWP/S SHOW
   A TREND TOWARD WEAKENING LOW-LEVEL SHEAR IN THE AREA WHERE STORMS
   ARE FORMING AND WILL MOVE OVER THE NEXT FEW HOURS.  THE STRONGER
   LOW-LEVEL SHEAR IS LOCATED ALONG THE WARM FRONT IN CENTRAL
   MN...WHERE CLOUDS AND COOL SURFACE TEMPERATURES HAVE LIMITED
   INSTABILITY.  PRESENT INDICATIONS ARE THAT THE COLD FRONTAL STORMS
   WILL BE THE PRIMARY CONCERN THROUGH THE AFTERNOON...WITH THE
   POSSIBILITY OF DAMAGING WINDS AND LARGE HAIL WITH LINE SEGMENTS
   AND/OR SPLITTING SUPERCELLS.
   
   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 27035.
   
   
   ...THOMPSON
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