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Severe Thunderstorm Watch 535
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WW0535 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.
   SEL5
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 535
   NWS STORM PREDICTION CENTER NORMAN OK
   320 PM MDT TUE JUN 30 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          PARTS OF EASTERN MONTANA
          PARTS OF WESTERN NORTH DAKOTA
          PARTS OF WESTERN SOUTH DAKOTA
          PARTS OF NORTHEAST WYOMING
   
   EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 320 PM UNTIL
   1000 PM MDT.
   
   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 60
   STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH
   NORTHWEST OF WILLISTON NORTH DAKOTA TO 45 MILES SOUTHWEST OF
   RAPID CITY SOUTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH
   SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).
   
   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 533...WW 534...
   
   DISCUSSION...AREA OF MDTLY UNSTABLE AIR MASS STRADDLES ND/MT BORDER
   SWD TO BLACK HILLS.  WITH 30-40KT OF DEEP LAYER SHEAR AND LITTLE
   REMAINING CINH...THUNDERSTORMS WILL INCREASE IN NUMBER AND INTENSITY
   ACROSS WATCH AREA WITH A FEW SUPERCELLS DEVELOPING.  PRIMARY THREAT
   WILL BE LARGE HAIL/DAMAGING DOWNBURSTS WINDS...PARTICULARLY
   ASSOCIATED WITH ANY SUPERCELL.
   
   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 29025.
   
   
   ...HALES
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Page last modified: July 01, 2009
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