

000 

WWUS20 KWNS 282136

SEL2

SPC WW 282136

NDZ000-SDZ000-WYZ000-290500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 302

NWS STORM PREDICTION CENTER NORMAN OK

335 PM MDT MON MAY 28 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN INTO CENTRAL NORTH DAKOTA

       WESTERN AND PART OF CENTRAL SOUTH DAKOTA

       FAR NORTHEASTERN WYOMING



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 335 PM UNTIL

1100 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 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH

SOUTHWEST OF MOORCROFT WYOMING TO 25 MILES SOUTH SOUTHEAST OF

JAMESTOWN NORTH DAKOTA.  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...SEVERE THUNDERSTORMS ARE EXPECTED TO MOVE/DEVELOP SW-NE

ACROSS WW THROUGH THE EVENING WITHIN AXIS OF MODERATE TO STRONG

INSTABILITY ALONG AND JUST BEHIND SURFACE FRONT.  SHEAR WILL REMAIN

SUFFICIENT FOR SUPERCELLS AND LINEAR STRUCTURES...ENHANCING THE

THREATS OF LARGE HAIL AND DAMAGING WINDS WITH THE MORE INTENSE AND

LONGER-LIVED CLUSTERS.



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 25025.





...EVANS

