WATCHES: Severe Thunderstorm Watch Number 908

WWUS20 KWNS 261741
SEL8
SPC WW 261741
MNZ000-LSZ000-270300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 908
NWS STORM PREDICTION CENTER NORMAN OK
1240 PM CDT FRI SEP 26 2008

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

NORTHERN MINNESOTA
LAKE SUPERIOR

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1240 PM UNTIL
1000 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 85
STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES WEST
NORTHWEST OF ELY MINNESOTA TO 25 MILES SOUTHWEST OF BRAINERD
MINNESOTA. 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...TSTMS ARE EXPECTED TO INCREASE IN BOTH COVERAGE AND
INTENSITY THIS AFTERNOON ALONG COLD FRONT AND IN ADVANCE OF SHORT
WAVE TROUGH TRANSLATING EWD INTO THE REGION. DAYTIME
HEATING...MODEST BOUNDARY LAYER MOISTURE AND STEEP MIDLEVEL LAPSE
RATES WILL ALL CONTRIBUTE TO A DECREASING CAP AND THE DEVELOPMENT OF
MODERATE INSTABILITY WITH MLCAPE APPROACHING 2000 J/KG. AS
SUCH...ONGOING ELEVATED STORMS ARE EXPECTED TO BECOME PROGRESSIVELY
SURFACE-BASED WITHIN AN ENVIRONMENT OF STRENGTHENING VERTICAL SHEAR
WHICH WILL ATTEND SHORT WAVE TROUGH. THUS...POTENTIAL WILL EXIST
FOR A FEW SUPERCELL STRUCTURES CAPABLE OF LARGE HAIL AND DAMAGING
WIND GUSTS.

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.

...MEAD/HALES

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