WATCHES: Severe Thunderstorm Watch Number 805

WWUS20 KWNS 040351
SEL5
SPC WW 040351
MTZ000-NDZ000-SDZ000-WYZ000-041100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 805
NWS STORM PREDICTION CENTER NORMAN OK
950 PM MDT SUN AUG 3 2008

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

EASTERN AND SOUTHERN MONTANA
SOUTHWEST NORTH DAKOTA
NORTHWEST SOUTH DAKOTA
NORTHEAST WYOMING

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 950 PM UNTIL
500 AM MDT.

HAIL TO 1.5 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 125
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTHEAST OF
MILES CITY MONTANA TO 55 MILES EAST OF GILLETTE WYOMING. 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 803...WW 804...

DISCUSSION...TSTMS FORMING ALONG ZONE OF ASCENT IN ENTRANCE REGION
OF MID/UPR LVL SPEED MAX CROSSING ERN MT EXPECTED TO SLOWLY INCREASE
IN STRENGTH THROUGH LATE TONIGHT AS ACTIVITY ENCOUNTERS INCREASING
MOISTURE WITH EWD EXTENT. SEASONABLY STRONG DEEP UNIDIRECTIONAL WSW
FLOW AND STEEP CLOUD LAYER LAPSE RATES SUGGEST POTENTIAL FOR
SUSTAINED/ORGANIZED STORMS/POSSIBLE SUPERCELLS WITH HAIL/WIND.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27035.

...CORFIDI

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