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Severe Thunderstorm Watch 447
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WW0447 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate 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.
   SEL7
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 447
   NWS STORM PREDICTION CENTER NORMAN OK
   620 PM CDT WED JUN 17 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHWEST IOWA
          EXTREME SOUTHWEST MINNESOTA
          NORTHEAST NEBRASKA
          SOUTHEAST SOUTH DAKOTA
   
   EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 620 PM
   UNTIL 100 AM CDT.
   
   HAIL TO 2.5 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 80
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST
   NORTHWEST OF ONEILL NEBRASKA TO 30 MILES SOUTHEAST OF SPENCER
   IOWA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
   WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).
   
   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 439...WW 440...WW
   441...WW 442...WW 443...WW 445...WW 444...WW 446...
   
   DISCUSSION...SCATTERED SEVERE STORMS WILL FORM AND/OR MOVE INTO THE
   WATCH AREA FROM THE W/SW OVER THE NEXT FEW HOURS.  STRONG
   INSTABILITY IS PRESENT ACROSS THIS AREA TO THE N OF A NWD MOVING
   OUTFLOW BOUNDARY ACROSS ERN NEB...WHILE DEEP LAYER VERTICAL SHEAR IS
   SUFFICIENT FOR SUPERCELLS.  AN ISOLATED TORNADO MAY OCCUR...BUT
   LOW-LEVEL SHEAR IS NOT PARTICULARLY STRONG WITH RELATIVELY STRAIGHT
   HODOGRAPHS...THUS SUPERCELLS WITH LARGE HAIL SHOULD BE THE PRIMARY
   SEVERE THREAT.  AS A FEW STORM MERGERS OCCUR...THERE WILL BE SOME
   INCREASE IN THE WIND DAMAGE THREAT LATER THIS EVENING.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
   MOTION VECTOR 27025.
   
   
   ...THOMPSON
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