SEL1
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 531
   NWS STORM PREDICTION CENTER NORMAN OK
   215 PM MDT SUN JUN 26 2005
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          EASTERN MONTANA
          WESTERN NORTH DAKOTA
          NORTHWEST SOUTH DAKOTA
          NORTHEAST WYOMING
   
   EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 215 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 55 MILES NORTH
   NORTHEAST OF WILLISTON NORTH DAKOTA TO 35 MILES EAST SOUTHEAST OF
   MOORCROFT WYOMING.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
   
   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 529...WW 530...
   
   DISCUSSION...THUNDERSTORMS INCREASING AHEAD OF S/WV TROUGH AND MID
   LEVEL WIND MAX MOVING FROM WY INTO NRN HIGH PLAINS.  WITH A VERY
   MOIST AND MODERATELY UNSTABLE AIR MASS AVAILABLE ACROSS THE
   WATCH...A FEW SEVERE THUNDERSTORMS ARE EXPECTED INCLUDING LARGE HAIL
   AND 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 500. MEAN STORM
   MOTION VECTOR 23030.
   
   
   ...HALES