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Severe Thunderstorm Watch 554
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WW0554 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.
   SEL4
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 554
   NWS STORM PREDICTION CENTER NORMAN OK
   135 PM MDT MON JUL 6 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          EASTERN IDAHO
          PARTS OF SOUTHWEST AND CENTRAL MONTANA
          NORTHWEST WYOMING
   
   EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 135 PM UNTIL 900
   PM MDT.
   
   HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 185
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH OF
   DRUMMOND MONTANA TO 55 MILES EAST OF HARLOWTON MONTANA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
   UPDATE (WOUS64 KWNS WOU4).
   
   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 553...
   
   DISCUSSION...A POTENT AND WELL-DEFINED SHORT WAVE TROUGH AND
   ASSOCIATED COLD FRONT WILL MOVE ACROSS THE ROCKIES AND ENCOUNTER AN
   INCREASINGLY UNSTABLE AIRMASS ALONG AND EAST OF THE CONTINENTAL
   DIVIDE THIS AFTERNOON. AS THE SYNOPTIC FORCING ACTS TO STEEPEN MID
   LAPSE RATES...BOUNDARY LAYER MOISTENING/WARMING WILL CONTRIBUTE TO
   MLCAPE IN THE 800-1200 J/KG RANGE...MORE THAN ADEQUATE TO SUPPORT
   ROBUST STORM UPDRAFTS IN THE PRESENCE OF INCREASINGLY STRONG SHEAR
   AND LARGER SCALE DYNAMICS.
   INITIALLY QUASI-DISCRETE CELLS/SUPERCELLS WILL BECOME INCREASINGLY
   FOCUSED AND TAKE ON LINEAR CHARACTERISTICS AS COLD FRONT BECOMES
   BETTER DEFINED EAST OF THE HIGHER TERRAIN LATER TODAY. A FEW OF
   THESE STORMS COULD PRODUCE LARGE HAIL AND POSSIBLY EVEN A BRIEF/WEAK
   TORNADO BEFORE ACTIVITY MERGES AND EVOLVES INTO A SEVERE SQUALL LINE
   WITH WIDESPREAD DAMAGING WINDS BECOMING MORE OF A THREAT WITH TIME.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
   MOTION VECTOR 26035.
   
   
   ...CARBIN
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