SEL8
SPC WW 132032
MTZ000-140400-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 268
NWS STORM PREDICTION CENTER NORMAN OK
230 PM MDT SUN MAY 13 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHERN AND EASTERN MONTANA
EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 230 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 75
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTHWEST
OF LIVINGSTON MONTANA TO 10 MILES NORTHEAST OF BAKER MONTANA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU8).
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...STRONG SHORTWAVE TROUGH IS EXPECTED TO INCREASE
THUNDERSTORM COVERAGE AND INTENSITY FROM WEST TO EAST ACROSS WW LATE
TODAY AND THIS EVENING. AIR MASS IS ALREADY MODERATELY UNSTABLE
WITH EFFECTIVE SHEAR FROM 40-50 KT PROVIDING AMPLE SHEAR FOR
SUPERCELLS AND ORGANIZED LINES. LARGE HAIL AND DAMAGING WINDS ARE
EXPECTED AS STORMS SPREAD QUICKLY EWD ACROSS LOWER ELEVATIONS OF SRN
AND INTO ERN MT THIS EVENING.
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 500. MEAN STORM
MOTION VECTOR 27025.
..EVANS
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