

363 

WWUS20 KWNS 141403

SEL2

SPC WW 141403

MIZ000-MNZ000-WIZ000-LSZ000-142100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 472

NWS STORM PREDICTION CENTER NORMAN OK

900 AM CDT WED JUL 14 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN MICHIGAN UPPER PENINSULA

       PART OF CENTRAL AND NORTHEAST MINNESOTA

       NORTHWEST WISCONSIN

       LAKE SUPERIOR



EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 900 AM UNTIL

400 PM CDT.



TORNADOES...HAIL TO 2.5 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 100 STATUTE

MILES EAST AND WEST OF A LINE FROM 55 MILES SOUTHWEST OF

MINNEAPOLIS MINNESOTA TO 20 MILES NORTH NORTHEAST OF KENNEDY

WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 471. WATCH NUMBER 471 WILL NOT BE IN EFFECT AFTER

900 AM CDT.



DISCUSSION...MATURE MCS CONTINUES EWD ACROSS NERN MN THIS MORNING

WITH PREFERENTIAL...MORE DISCRETE STORM DEVELOPMENT OBSERVED NEAR

WARM FRONT N OF MSP.  CONVECTIVE SYSTEM IS EXPECTED TO CONTINUE EWD

ACROSS NRN WI TODAY WITH STORM REGENERATION TO THE SW ACROSS

CNTRL/ERN MN.  12Z OBSERVED SOUNDINGS SUGGEST THAT ONGOING STORMS

MAY BE SLIGHTLY ELEVATED WITH A THREAT FOR LARGE HAIL AND DAMAGING

WIND GUSTS.  HOWEVER...DAYTIME HEATING COMBINED WITH A MOIST

BOUNDARY LAYER WILL RESULT IN A MODERATE TO STRONGLY UNSTABLE AIR

MASS BY LATE MORNING/AFTERNOON.  WHEN COUPLED WITH STRONG LOW AND

DEEP-LAYER SHEAR...ENVIRONMENT WILL BE SUPPORTIVE OF TORNADIC

SUPERCELLS IN ADDITION TO LARGE HAIL AND DAMAGING WIND GUSTS.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 27030.





...MEAD

