WATCHES: Severe Thunderstorm Watch Number 648

WWUS20 KWNS 152122
SEL8
SPC WW 152122
MTZ000-160300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 648
NWS STORM PREDICTION CENTER NORMAN OK
325 PM MDT FRI JUL 15 2011

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

SOUTHEAST MONTANA

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 325 PM UNTIL 900
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 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST OF
BILLINGS MONTANA TO 40 MILES NORTH NORTHEAST OF BROADUS 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...SCATTERED THUNDERSTORMS ARE EXPECTED TO INTENSIFY OVER
THE HIGHER TERRAIN OF SOUTH-CENTRAL MT THIS AFTERNOON AND SPREAD
EASTWARD ACROSS THE WATCH AREA. DEWPOINTS IN THE 50S AND MUCAPE
VALUES OF 1500-2000 J/KG...COUPLED WITH SUFFICIENT WESTERLY FLOW
ALOFT...WILL POSE A RISK OF ISOLATED 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 500. MEAN STORM
MOTION VECTOR 26030.

...HART

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