WATCHES: Severe Thunderstorm Watch Number 499

WWUS20 KWNS 282225
SEL9
SPC WW 282225
MTZ000-290600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 499
NWS STORM PREDICTION CENTER NORMAN OK
420 PM MDT WED AUG 28 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN AND EASTERN MONTANA

* EFFECTIVE THIS WEDNESDAY AFTERNOON FROM 420 PM UNTIL MIDNIGHT
MDT.

* PRIMARY THREATS INCLUDE...
SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2
INCHES IN DIAMETER POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 95
STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH
NORTHEAST OF GLASGOW MONTANA TO 30 MILES WEST OF BROADUS MONTANA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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...TSTMS EXPECTED TO INCREASE IN STRENGTH AND COVERAGE
THIS EVE ALONG AND E OF WEAK NW-SE WARM FRONT OVER ERN MT...AND
AHEAD OF SHORTWAVE IMPULSE TRACKING ENE FROM THE WRN PART OF THE
STATE. BACKED /SELY/ LOW-LVL FLOW...WEAK CONVERGENCE...AND PRESENCE
OF AMPLE MOISTURE /PW AOA 1.25 INCHES/ NE OF FRONT SUGGEST POTENTIAL
FOR A FEW ENE-MOVING SUPERCELLS WITH LARGE HAIL...LOCALLY DMGG
WIND...AND POSSIBLY A TORNADO. OTHER STORMS...MORE LIKELY ORGANIZED
INTO SHORT BANDS OR LEWPS AND POSING A THREAT FOR SVR
WIND/MARGINALLY SVR HAIL...MAY EVOLVE ALONG N-S COLD FRONT NOW
APPROACHING THE WRN PART OF THE WW. THIS ACTIVITY SHOULD ALSO MOVE
GENERALLY E OR ENEWD THROUGH LATE EVE.

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 25030.


...CORFIDI

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