WATCHES: Tornado Watch Number 678

WWUS20 KWNS 082052
SEL8
SPC WW 082052
MNZ000-WIZ000-090300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 678
NWS STORM PREDICTION CENTER NORMAN OK
345 PM CDT SAT AUG 8 2009

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

EASTERN MINNESOTA
WESTERN WISCONSIN

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 345 PM UNTIL
1000 PM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 35 MILES NORTH NORTHWEST OF
MANKATO MINNESOTA TO 60 MILES EAST OF EAU CLAIRE WISCONSIN. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU8).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...CONTINUE...WW 677...

DISCUSSION...UPPER IMPULSE OVER THE ERN DAKOTAS IS EXPECTED TO AID
IN INCREASED STORM DEVELOPMENT ACROSS ERN MN AND WRN WI INTO THE
EVENING HOURS. EFFECTIVE SHEAR NEAR 50 KT AND EXTREME INSTABILITY
AROUND 5000 J/KG WILL BE FAVORABLE FOR INTENSE SUPERCELLS WITH VERY
LARGE HAIL AND WIND DAMAGE. ALTHOUGH THE LOW LEVEL SHEAR IS ONLY
AROUND 15 KT...THE PRESENCE OF LOW LEVEL BOUNDARIES AND AMOUNT OF
INSTABILITY MAY COMPENSATE FOR THE WEAKER LOW LEVEL SHEAR AND YIELD
A COUPLE OF TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 24035.

...IMY

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