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Severe Thunderstorm Watch 667
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WW0667 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
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.
   SEL7
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 667
   NWS STORM PREDICTION CENTER NORMAN OK
   1235 PM MDT THU AUG 6 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHERN AND CENTRAL IDAHO
          WESTERN MONTANA
          NORTHEAST NEVADA
   
   EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1235 PM UNTIL
   900 PM MDT.
   
   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 85
   STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES SOUTHEAST OF
   OWYHEE NEVADA TO 5 MILES NORTH NORTHEAST OF GREAT FALLS MONTANA. 
   FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU7).
   
   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 666...
   
   DISCUSSION...ISOLATED STRONG/SEVERE THUNDERSTORMS DEVELOPED THIS
   MORNING FROM NERN NV INTO CENTRAL ID...AND ADDITIONAL SEVERE STORMS
   ARE LIKELY TO DEVELOP THIS AFTERNOON AND EVENING AND SPREAD NEWD
   WITH TIME IN RESPONSE TO INCREASING DYNAMIC FORCING IN ADVANCE OF
   THE NRN CA UPPER LOW.  VISIBLE IMAGERY INDICATES CLEAR SKIES FROM
   NERN NV ACROSS SWRN MT IMMEDIATELY EAST OF THE FRONTAL BAND...AND
   STRONG HEATING AND DESTABILIZATION IS EXPECTED TO OCCUR THIS
   AFTERNOON.  STRONG SWLY FLOW ALOFT AND DEEP LAYER SHEAR OF 40-50 KT
   IN THE LOWEST 6 KM AGL WILL ENHANCE STORM ORGANIZATION AND
   INTENSITY...WITH POTENTIAL FOR SUPERCELLS AND BOWING LINE SEGMENTS
   TO DEVELOP.  DAMAGING WINDS AND LARGE WILL BE THE PRIMARY SEVERE
   THREATS.
   
   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 23035.
   
   
   ...WEISS
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