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WWUS20 KWNS 252339

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SPC WW 252339

MIZ000-WIZ000-LSZ000-260600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 446

NWS STORM PREDICTION CENTER NORMAN OK

635 PM CDT THU JUL 25 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  UPPER MICHIGAN

  NORTHERN WISCONSIN

  LAKE SUPERIOR



* EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 635 PM

  UNTIL 100 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTH OF

DULUTH MINNESOTA TO 55 MILES SOUTHEAST OF IRON MOUNTAIN MICHIGAN.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU6).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 443...WW 444...WW 445...



DISCUSSION...TSTMS EXPECTED TO CONTINUE FORMING ALONG FRONT STALLED

ROUGHLY ALONG THE NRN WI/UPR MI BORDER AS FAIRLY STRONG FORCING FOR

ASCENT ASSOCIATED WITH NRN MN UPR IMPULSE SWEEPS ESEWD. OTHER STORMS

MAY FORM IN NE MN/NW WI ALONG THE SFC COLD FRONT PRECEDING THE UPR

IMPULSE. COOL AIR ALOFT AND ENHANCED LOW TO MID-LVL SHEAR NEAR FRONT

SUGGEST POTENTIAL FOR SUPERCELLS WITH A RISK FOR SVR HAIL AND

POSSIBLY A TORNADO. FARTHER S IN WI...IN THE AREA W OF

GRB...ADDITIONAL STORMS MAY FORM DURING THE NEXT COUPLE HOURS IN

AREA OF WAA/MOISTURE TRANSPORT ASSOCIATED WITH STRENGTHENING LOW-LVL

JET STREAM. THIS ACTIVITY SHOULD BE MORE DIURNAL THAN ACTIVITY

FARTHER N...BUT MAY BE CAPABLE OF SVR HAIL.



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 450. MEAN STORM

MOTION VECTOR 30025.





...CORFIDI

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