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Severe Thunderstorm Watch 606
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WW0606 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.
   SEL6
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 606
   NWS STORM PREDICTION CENTER NORMAN OK
   325 PM CDT MON JUL 20 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          PARTS OF NORTHEAST COLORADO
          MUCH OF WESTERN NEBRASKA
          PARTS OF EASTERN WYOMING
   
   EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 325 PM UNTIL
   1100 PM 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 80
   STATUTE MILES EITHER SIDE OF A LINE FROM 50 MILES NORTH NORTHWEST
   OF CASPER WYOMING TO 30 MILES SOUTHEAST OF NORTH PLATTE NEBRASKA.
    FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU6).
   
   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.
   
   DISCUSSION...DEVELOPING UPSLOPE SPREADING SWD IN HIGH PLAINS WILL
   ENHANCE SHEAR AND INSTABILITY FOR SEVERE THUNDERSTORMS IN A NWLY
   FLOW REGIME.  STORMS ARE NOW DEVELOPING ALONG BOUNDARIES AND IN
   UPSLOPE AREA OF BIG HORNS.  STORMS WILL CONTINUE TO INCREASE IN
   NUMBER AND INTENSITY AS THEY DEVELOP SEWD THRU THE WATCH AREA. 
   PARAMETERS ARE IN PLACE FOR SUPERCELL FORMATION WHICH WILL ENHANCE
   POTENTIAL FOR LARGE HAIL AND DAMAGING DOWNBURST WINDS.
   
   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 32025.
   
   
   ...HALES
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