SEL7
SPC WW 280701
MNZ000-WIZ000-281100-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 657
NWS STORM PREDICTION CENTER NORMAN OK
200 AM CDT TUE AUG 28 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHERN MINNESOTA
WESTERN WISCONSIN
EFFECTIVE THIS TUESDAY MORNING FROM 200 AM UNTIL 600 AM CDT.
HAIL TO 1.5 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 40
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTHWEST
OF MANKATO MINNESOTA TO 35 MILES NORTHEAST OF EAU CLAIRE
WISCONSIN. 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.
DISCUSSION...SMALL FORWARD-PROPAGATING MCS HAS FORMED IN THE PAST
HOUR IN SW MN. SYSTEM SHOULD CONTINUE ENE INTO W CNTRL WI LATER
THIS MORNING... ALONG AND JUST N OF VERY SHALLOW OUTFLOW BOUNDARY
NOW OVER THE SRN SUBURBS OF METRO MSP. MODERATE TO STRONG...DEEP
UNIDIRECTIONAL WSW FLOW AND DEGREE OF INSTABILITY LIKELY PRESENT
ABOVE OUTFLOW BOUNDARY SUGGEST POTENTIAL FOR DAMAGING WIND AND
MARGINALLY SVR HAIL AS SYSTEM CONTINUES ENEWD.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 25040.
..CORFIDI
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