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Severe Thunderstorm Watch 455
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WW0455 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.
   SEL5
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 455
   NWS STORM PREDICTION CENTER NORMAN OK
   1155 PM CDT WED JUN 17 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          MOST OF IOWA
          EXTREME NORTHWEST ILLINOIS
          SOUTHEAST MINNESOTA
          SOUTHWEST WISCONSIN
   
   EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1155 PM
   UNTIL 600 AM 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 105
   STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHEAST OF
   MANKATO MINNESOTA TO 20 MILES SOUTHEAST OF KNOXVILLE IOWA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
   UPDATE (WOUS64 KWNS WOU5).
   
   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...THIS SEVERE THUNDERSTORM WATCH REPLACES
   TORNADO WATCH NUMBER 449. WATCH NUMBER 449 WILL NOT BE IN EFFECT
   AFTER 1155 PM CDT. CONTINUE...WW 447...WW 448...WW 450...WW
   451...WW 452...WW 453...WW 454...
   
   DISCUSSION...THUNDERSTORMS CONTINUE IN THE BROAD ZONE OF LOW-LEVEL
   WARM ADVECTION CENTERED OVER IA.  A RESERVOIR OF MODERATE-STRONG
   INSTABILITY REMAINS TO THE SW OF THE WARM FRONT NEAR THE MS
   RIVER...AND IN ADVANCE OF THE ONGOING STORMS ACROSS WRN/CENTRAL
   IA...AND THIS INSTABILITY WILL MAINTAIN A SEVERE THREAT OVERNIGHT. 
   VERTICAL SHEAR IS STILL FAVORABLE FOR SUPERCELLS...THOUGH SLOW
   STABILIZATION OF NEAR-SURFACE LAYER SUGGESTS THAT LARGE HAIL AND
   DAMAGING WINDS WILL BE THE PRIMARY THREATS.
   
   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 27020.
   
   
   ...THOMPSON
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