WATCHES: Severe Thunderstorm Watch Number 280

WWUS20 KWNS 192038
SEL0
SPC WW 192038
MTZ000-WYZ000-200400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 280
NWS STORM PREDICTION CENTER NORMAN OK
240 PM MDT SAT MAY 19 2007

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

CENTRAL MONTANA
NORTH CENTRAL WYOMING

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 240 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 95
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTH
NORTHWEST OF BOZEMAN MONTANA TO 105 MILES EAST NORTHEAST OF
BILLINGS MONTANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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...SCATTERED THUNDERSTORMS ARE BEGINNING TO FORM OVER THE
MOUNTAINS OF SOUTHWEST MT. STORMS ARE EXPECTED TO INTENSIFY AS THEY
SPREAD EASTWARD INTO LOW LEVEL MOISTURE/INSTABILITY AXIS WHICH
EXTENDS FROM BTM - BIL - SOUTHEAST MT. FORECAST SOUNDINGS SUGGEST
THE POTENTIAL FOR HIGH-BASED SUPERCELLS CAPABLE OF LARGE HAIL AND
DAMAGING WINDS.

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 24035.

..HART

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