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Severe Thunderstorm Watch 543
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WW0543 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.
   SEL3
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 543
   NWS STORM PREDICTION CENTER NORMAN OK
   1255 PM MDT THU JUN 23 2011
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          LARGE PART OF WESTERN MONTANA
   
   EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1255 PM UNTIL
   800 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 135
   STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES EAST
   NORTHEAST OF CUT BANK MONTANA TO 40 MILES SOUTH SOUTHEAST OF
   HELENA MONTANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
   
   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 541...WW 542...
   
   DISCUSSION...THUNDERSTORMS ARE DEVELOPING OVER THE HIGHER TERRAIN
   AHEAD OF THE COLD FRONT AND APPROACHING UPPER TROUGH.  WITH MLCAPES
   AOA 1000 J/KG... VERY STEEP LAPSE RATES AND 40-50KT OF DEEP LAYER
   SHEAR...DAMAGING WINDS WILL DEVELOP WITH THE STORMS AS THEY FORM
   CLUSTERS AND BOWING SEGMENTS.  IN ADDITION LARGE HAIL IS LIKELY
   GIVEN THE STEEP LAPSE RATES AND SHEAR PROFILES.
   
   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 24035.
   
   
   ...HALES
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Page last modified: June 24, 2011
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