WATCHES: Severe Thunderstorm Watch Number 633

WWUS20 KWNS 301902
SEL3
SPC WW 301902
MTZ000-WYZ000-310100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 633
NWS STORM PREDICTION CENTER NORMAN OK
105 PM MDT MON AUG 30 2010

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

PARTS OF SOUTHEASTERN MONTANA
NORTHEASTERN WYOMING

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 105 PM UNTIL 700
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 70
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES NORTH
NORTHWEST OF WORLAND WYOMING TO 80 MILES EAST OF GILLETTE
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.

DISCUSSION...THUNDERSTORMS ARE INCREASING AHEAD OF VIGOROUS TROUGH
MOVING ACROSS CENTRAL WY ATTM. WITH MLCAPES TO 1000 J/KG AND LOW
LEVEL CONVERGENCE E OF BIG HORN MTNS...EXPECT SEVERE THUNDERSTORM
POTENTIAL TO INCREASE EWD ACROSS THE WATCH THRU THE AFTERNOON
HEATING PERIOD.

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 450. MEAN STORM
MOTION VECTOR 24025.

...HALES

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