

000 

WWUS20 KWNS 222135

SEL5

SPC WW 222135

MTZ000-NDZ000-230400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 445

NWS STORM PREDICTION CENTER NORMAN OK

335 PM MDT FRI JUN 22 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF EASTERN MONTANA

       MUCH OF WESTERN NORTH DAKOTA



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 335 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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES NORTHEAST OF

MINOT NORTH DAKOTA TO 20 MILES SOUTHEAST OF BAKER MONTANA.  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 442...WW 443...WW 444...



DISCUSSION...WHILE SHEAR PROFILES ARE MODEST...INSTABILITY IS STRONG

VICINITY OF BOUNDARY ACROSS WRN ND INTO ERN MT.  THUNDERSTORMS

EXPECTED TO DEVELOP RAPIDLY VICINITY BOUNDARY AND MOVE SLOWLY E/SE

THRU THE EVENING.  PRIMARY THREAT WILL BE LARGE HAIL WITH DAMAGING

WINDS ASSOCIATED WITH STRONGEST STORMS.



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 550. MEAN STORM

MOTION VECTOR 27015.





...HALES

