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Severe Thunderstorm Watch 665
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WW0665 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 665
   NWS STORM PREDICTION CENTER NORMAN OK
   515 PM CDT WED AUG 5 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          MUCH OF EASTERN COLORADO
          PARTS OF SOUTHERN NEBRASKA PANHANDLE
          PARTS OF SOUTHEAST WYOMING
   
   EFFECTIVE THIS WEDNESDAY AFTERNOON FROM 515 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 55
   STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES WEST
   NORTHWEST OF SIDNEY NEBRASKA TO 45 MILES WEST SOUTHWEST OF
   SPRINGFIELD COLORADO.  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...CONTINUE...WW 664...
   
   DISCUSSION...UPSLOPE FLOW OF MOIST/UNSTABLE AIR MASS WILL SUPPORT
   THUNDERSTORMS MOVING EWD OFF THE HIGHER TERRAIN INTO THE PLAINS THIS
   EVENING. 30-35 KT OF EFFECTIVE SHEAR AND MLCAPES UPWARDS TO 2500
   J/KG COUPLED WITH STEEP LAPSE RATES WILL SUPPORT SEVERE
   THUNDERSTORMS INCLUDING SUPERCELLS.  LARGE HAIL AND DAMAGING WINDS
   WILL BE PRIMARY CONCERN...PARTICULARLY WITH ANY SUPERCELL ALONG WITH
   BRIEF TORNADOS AND/OR LANDSPOUTS.
   
   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 27020.
   
   
   ...HALES
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Page last modified: August 06, 2009
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