Tuesday, June 26, 2007

WATCHES: Severe Thunderstorm Watch Number 451

WWUS20 KWNS 261901
SEL1
SPC WW 261901
MNZ000-WIZ000-LSZ000-270200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 451
NWS STORM PREDICTION CENTER NORMAN OK
200 PM CDT TUE JUN 26 2007

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

EASTERN MINNESOTA
NORTHERN WISCONSIN
LAKE SUPERIOR

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 200 PM UNTIL
900 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 60
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH OF
GRAND MARAIS MINNESOTA TO 45 MILES WEST SOUTHWEST OF EAU CLAIRE
WISCONSIN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

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...LINE OF THUNDERSTORMS IS INCREASING ALONG COLD FRONT
OVER EASTERN MN. THESE STORMS ARE LIKELY TO INTENSIFY AND TRACK
EASTWARD INTO WI THIS AFTERNOON. MODERATE INSTABILITY AND
SUFFICIENT VERTICAL SHEAR WILL HELP TO ORGANIZE STORMS WITH A THREAT
OF LOCALLY DAMAGING WINDS AND HAIL.

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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