SEL0
SPC WW 132035
MTZ000-140400-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 740
NWS STORM PREDICTION CENTER NORMAN OK
235 PM MDT SUN SEP 13 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
MUCH OF EASTERN MONTANA
EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 235 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 90
STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF
GLASGOW MONTANA TO 30 MILES SOUTH OF MILES CITY 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...COLD UPPER LOW CONTINUES MOVING NNWWD THRU CENTRAL MT
WITH A 35-40KT SLY LOW LEVEL JET ERN MT. AIR MASS CONTINUES TO
DESTABILIZE ERN MT AND WITH 40-50KT OF DEEP LAYER
SHEAR...STRONG/SEVERE THUNDERSTORMS EXPECTED TO DEVELOP NEXT 1-2
HOURS. INITIALLY STORMS WILL FORM ECENTRAL MT THEN MOVE N/NEWD THRU
THE EVENING. POTENTIAL FOR ISOLATED SUPERCELLS WHICH WILL ENHANCE
THREAT OF BOTH LARGE HAIL AND BRIEF TORNADOES.
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 18030.
...HALES
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