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Severe Thunderstorm Watch 672
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WW0672 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
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.
   SEL2
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 672
   NWS STORM PREDICTION CENTER NORMAN OK
   240 PM MDT FRI AUG 7 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHERN MONTANA
          NORTHERN WYOMING
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 240 PM UNTIL
   1000 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 80
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTHWEST
   OF BILLINGS MONTANA TO 70 MILES EAST SOUTHEAST OF BROADUS
   MONTANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).
   
   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...STORMS ARE EXPECTED TO INTENSIFY ACROSS SRN MT/NRN WY
   AS THEY CONTINUE DEVELOPING ALONG A WEAK COLD FRONT IN NRN WY AND
   OTHER BOUNDARIES IN SRN MT. ALTHOUGH SURFACE WINDS ARE FROM THE
   NORTH ACROSS THE REGION...DEEP SLY/SWLY WINDS ALOFT WERE RESULTING
   IN 40-50 KT OF DEEP LAYER SHEAR. THIS SHEAR COMBINED WITH THE MOIST
   AND MODERATELY UNSTABLE AIR MASS WILL BE FAVORABLE FOR SUPERCELLS.
   THE THERMODYNAMIC ENVIRONMENT APPEARS MOST FAVORABLE FOR LARGE HAIL
   ...THOUGH THE STRONG DOWNDRAFTS MAY ALSO RESULT IN SPORADIC WIND
   DAMAGE.
   
   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 450. MEAN STORM
   MOTION VECTOR 23025.
   
   
   ...IMY
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