WATCHES: Severe Thunderstorm Watch Number 497

WWUS20 KWNS 231601
SEL7
SPC WW 231601
MNZ000-NDZ000-232300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 497
NWS STORM PREDICTION CENTER NORMAN OK
1100 AM CDT TUE JUN 23 2009

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

NORTHERN AND CENTRAL MINNESOTA
EASTERN NORTH DAKOTA

EFFECTIVE THIS TUESDAY MORNING AND EVENING FROM 1100 AM UNTIL 600
PM CDT.

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 EAST AND WEST OF A LINE FROM 30 MILES SOUTHWEST OF
BRAINERD MINNESOTA TO 30 MILES EAST NORTHEAST OF HALLOCK
MINNESOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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.

OTHER WATCH INFORMATION...CONTINUE...WW 495...WW 496...

DISCUSSION...THUNDERSTORMS HAVE INCREASED ALONG AN ARCING OUTFLOW
BOUNDARY OVER WEST CENTRAL MN...WHILE ELEVATED STORMS CONTINUE TO
DEVELOP OVER NERN ND. ACTIVITY APPEARS TO BE ASSOCIATED WITH
PRONOUNCED CYCLONIC SHEAR ASSOCIATED WITH A STRONG UPPER LEVEL JET
STREAK OVER NRN ND/SRN MANITOBA. STEEP LAPSE RATES ABOVE THE PBL
WILL ENHANCE INSTABILITY DURING THE AFTERNOON HEATING CYCLE...AND
STRONG VERTICAL SHEAR WILL PROMOTE SEVERE STORM DEVELOPMENT THROUGH
HE AFTERNOON HOURS.

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 24030.

...EVANS

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