

000 

WWUS20 KWNS 051939

SEL0

SPC WW 051939

MTZ000-060300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 350

NWS STORM PREDICTION CENTER NORMAN OK

140 PM MDT TUE JUN 5 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL MONTANA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 140 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 105

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES WEST

NORTHWEST OF CUT BANK MONTANA TO 75 MILES SOUTHEAST OF BILLINGS

MONTANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 347...WW 348...WW 349...



DISCUSSION...THUNDERSTORMS WILL INCREASE IN COVERAGE/INTENSITY

THROUGH THE AFTERNOON IN CONJUNCTION WITH CONTINUED DAYTIME HEATING

AND INCREASING LARGE SCALE ASCENT DOWNSTREAM FROM A LEAD SHORTWAVE

TROUGH OVER ID.  MODERATE INSTABILITY AND DEEP LAYER VERTICAL SHEAR

SHOULD SUPPORT A FEW SUPERCELLS AND SMALL BOWING SEGMENTS CAPABLE OF

PRODUCING DAMAGING WINDS AND LARGE HAIL WELL INTO THE EVENING.



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 25025.





...THOMPSON

