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Severe Thunderstorm Watch 671
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WW0671 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.
   SEL1
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 671
   NWS STORM PREDICTION CENTER NORMAN OK
   915 PM CDT THU AUG 6 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          PARTS OF WESTERN AND CENTRAL NEBRASKA
          SOUTH-CENTRAL SOUTH DAKOTA
   
   EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 915 PM
   UNTIL 500 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 65
   STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH OF
   VALENTINE NEBRASKA TO 45 MILES EAST SOUTHEAST OF IMPERIAL
   NEBRASKA.  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...THIS SEVERE THUNDERSTORM WATCH REPLACES
   TORNADO WATCH NUMBER 669. WATCH NUMBER 669 WILL NOT BE IN EFFECT
   AFTER 915 PM CDT. CONTINUE...WW 667...WW 668...WW 670...
   
   DISCUSSION...BROKEN BAND OF TSTMS ARE EXPECTED TO INTENSIFY TONIGHT
   WHILE PROGRESSING EWD INTO A MOIST/UNSTABLE AIR MASS WHERE INFLOW
   WILL BE ENHANCED BY 40-50 KT SLY LLJ.  THE COMBINATION OF THE
   MODERATE INSTABILITY /MLCAPE OF 1000-1500 J PER KG/ AND AROUND 40 KT
   OF DEEP WLY SHEAR WILL BE SUPPORTIVE OF EMBEDDED BOWING STRUCTURES
   CAPABLE OF DAMAGING WINDS AND HAIL.
   
   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 27030.
   
   
   ...MEAD/HALES
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