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972 

WWUS20 KWNS 132124

SEL3

SPC WW 132124

MNZ000-WIZ000-140300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 613

NWS STORM PREDICTION CENTER NORMAN OK

425 PM CDT FRI AUG 13 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST MINNESOTA

       A SMALL PART OF SOUTHWEST WISCONSIN



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 425 PM UNTIL

1000 PM CDT.



TORNADOES...HAIL TO 2 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 35 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF

ROCHESTER MINNESOTA TO 40 MILES SOUTHEAST OF ROCHESTER MINNESOTA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 609...WW 610...WW

611...WW 612...



DISCUSSION...A 2-3 HOUR WINDOW OF OPPORTUNITY EXISTS FOR SUPERCELLS

WITH A RISK OF TORNADOES ACROSS SE MN...IN THE NARROW ZONE OF

ENHANCED LOW-LEVEL SHEAR AND MODERATE SURFACE-BASED INSTABILITY NW

OF THE LARGER COLD POOL ACROSS ERN IA/NW IL/SRN WI.



AVIATION...TORNADOES AND 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 24020.





...THOMPSON

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