WATCHES: Severe Thunderstorm Watch Number 533

WWUS20 KWNS 182103
SEL3
SPC WW 182103
MNZ000-WIZ000-190300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 533
NWS STORM PREDICTION CENTER NORMAN OK
400 PM CDT WED JUL 18 2007

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

SOUTHEAST MINNESOTA
WESTERN WISCONSIN

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 400 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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES EAST
SOUTHEAST OF EAU CLAIRE WISCONSIN TO 25 MILES NORTH OF MANKATO
MINNESOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 529...WW 530...WW
531...WW 532...

DISCUSSION...TSTMS DEVELOPING RAPIDLY ALONG WIND SHIFT BOUNDARY
DEVELOPING SWD INTO VERY UNSTABLE AIR MASS ACROSS SRN MN/WRN WI.
INCREASINGLY STRONG ASCENT FROM MCV...AND LARGE SCALE HEIGHT FALLS
ASSOCIATED WITH MID/UPPER IMPULSE DEVELOPING SEWD FROM NRN
NM/WI...SHOULD CONTINUE TO AID STRONG TO SEVERE STORM DEVELOPMENT
INTO THIS EVENING. SHEAR AND INSTABILITY VALUES WILL SUPPORT
ROTATING STORMS/SUPERCELLS WITH LARGE HAIL AND HIGH WINDS LIKELY
FROM THE MORE INTENSE AND LONGER-LIVED CELLS.

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 32025.

..CARBIN/WEISS

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