

786 

WWUS20 KWNS 152219

SEL3

SPC WW 152219

MTZ000-WYZ000-160400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 323

NWS STORM PREDICTION CENTER NORMAN OK

420 PM MDT TUE JUN 15 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF CENTRAL MONTANA

       SMALL PART OF NORTHERN WYOMING



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 420 PM UNTIL

1000 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 40 MILES NORTHEAST OF

HAVRE MONTANA TO 35 MILES WEST SOUTHWEST OF SHERIDAN WYOMING.

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 321...WW 322...



DISCUSSION...SCATTERED THUNDERSTORMS ARE DEVELOPING EWD ACROSS THE

WATCH AREA WHERE THE AIR MASS IS NOW MDTLY UNSTABLE AND FAVORABLY

SHEARED.  WITH STEEP LAPSE RATES...STORMS EXPECTED TO CONTINUE

INTENSIFYING WITH POSSIBLE SUPERCELL DEVELOPMENT.  LARGE HAIL AND

LOCAL DAMAGING WINDS MOST LIKELY ASSOCIATED WITH ANY SUPERCELL.



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 24030.





...HALES

