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Severe Thunderstorm Watch 291
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WW0291 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.
   SEL1
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 291
   NWS STORM PREDICTION CENTER NORMAN OK
   710 PM CDT TUE MAY 12 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          CENTRAL AND NORTH CENTRAL NEBRASKA
          CENTRAL SOUTH DAKOTA
   
   EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 710 PM
   UNTIL 100 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 60
   STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES EAST OF NORTH
   PLATTE NEBRASKA TO 40 MILES NORTHWEST OF ABERDEEN SOUTH DAKOTA. 
   FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU1).
   
   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 289...WW 290...
   
   DISCUSSION...ONGOING SEVERE STORMS/SUPERCELLS FROM CENTRAL SD INTO
   CENTRAL NEB WILL LIKELY CONTINUE THROUGH EARLY TONIGHT IN ADVANCE OF
   A STRONG MID LEVEL TROUGH AND ASSOCIATED SURFACE COLD FRONT.  STEEP
   MID LEVEL LAPSE RATES AND 0-6 KM BULK SHEAR OF 45-60 KT WILL SUPPORT
   A CONTINUED THREAT FOR SUPERCELLS AND SMALL BOWS AS THE BELT OF
   ASCENT SPREADS FROM W TO E ACROSS SD AND NRN NEB...DESPITE SOMEWHAT
   LIMITED MOISTURE.
   
   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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