SEL4
SPC WW 102246
MTZ000-NDZ000-110600-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 584
NWS STORM PREDICTION CENTER NORMAN OK
445 PM MDT FRI AUG 10 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHEAST MONTANA
WESTERN NORTH DAKOTA
EFFECTIVE THIS FRIDAY AFTERNOON FROM 445 PM UNTIL MIDNIGHT MDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 75 MILES WEST OF
GLASGOW MONTANA TO 35 MILES NORTH OF BISMARCK NORTH DAKOTA. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).
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 580...WW 581...WW
582...WW 583...
DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO INTENSIFY THIS
EVENING ACROSS NORTHEAST MT AND WESTERN ND...IN REGION OF WEAKENING
CAP AND APPROACHING LARGE SCALE UPPER SUPPORT. STEEP LOW LEVEL
LAPSE RATES AND FAVORABLE EFFECTIVE SHEAR VALUES SUPPORT A RISK OF
SUPERCELL STORMS EARLY...FOLLOWED BY UPSCALE GROWTH INTO AN MCS WITH
ENHANCED DAMAGING WIND THREAT.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27035.
..HART
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