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Severe Thunderstorm Watch 189
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WW0189 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.
   SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 189
   NWS STORM PREDICTION CENTER NORMAN OK
   540 PM CDT SAT APR 23 2011
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          A LARGE PART OF NORTHERN ARKANSAS
          PARTS OF SOUTHERN ILLINOIS
          PARTS OF WESTERN KENTUCKY
          PARTS OF SOUTHERN MISSOURI
   
   EFFECTIVE THIS SATURDAY AFTERNOON FROM 540 PM UNTIL MIDNIGHT 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 50
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH
   SOUTHWEST OF FORT SMITH ARKANSAS TO 45 MILES EAST OF CAPE
   GIRARDEAU MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE
   THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).
   
   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 186...WW 187...WW 188...
   
   DISCUSSION...THUNDERSTORMS ARE INCREASING ALONG AND N OF STATIONARY
   BOUNDARY ACROSS THE NORTHERN PORTION OF THE WATCH.  WITH 50 KT OF
   SHEAR COUPLED WITH MLCAPES AOA 2000 J/KG AND STEEP MID LEVEL LAPSE
   RATES...SUPERCELLS ARE LIKELY.  PRIMARY THREAT WILL BE LARGE HAIL
   AND DAMAGING WINDS...PARTICULARLY WITH BOWING SEGMENTS.  ISOLATED
   TORNADOES ARE ALSO POSSIBLE WITH THE SUPERCELLS...EVEN WITH RATHER
   WEAK BOUNDARY LAYER FLOW.
   
   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 500. MEAN STORM
   MOTION VECTOR 24035.
   
   
   ...HALES
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Page last modified: April 24, 2011
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