

708 

WWUS20 KWNS 102022

SEL0

SPC WW 102022

IAZ000-MIZ000-MNZ000-WIZ000-LSZ000-110400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 120

NWS STORM PREDICTION CENTER NORMAN OK

320 PM CDT SUN APR 10 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF NORTHEAST IOWA

       PARTS OF WESTERN NORTHERN MICHIGAN

       SMALL PART OF SOUTHEAST MINNESOTA

       MUCH OF WISCONSIN

       LAKE SUPERIOR



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 320 PM UNTIL

1100 PM CDT.



...THIS IS A PARTICULARLY DANGEROUS SITUATION...



DESTRUCTIVE TORNADOES...LARGE HAIL TO 4 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 105 STATUTE

MILES EAST AND WEST OF A LINE FROM 5 MILES NORTH NORTHWEST OF

IRONWOOD MICHIGAN TO 45 MILES SOUTH OF CAMP DOUGLAS WISCONSIN.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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.



DISCUSSION...RAPID DEVELOPMENT OF SEVERE SUPERCELL THUNDERSTORMS

IMMINENT ALONG THE COLD FRONT FROM WI/MN BORDER INTO NERN IA.  AIR

MASS HAS DESTABILIZED AHEAD OF FRONT WITH MLCAPES TO 2000

J/KG...COUPLED WITH A VERY INTENSE WIND FIELD WILL LEAD TO POTENTIAL

OF BOTH VERY LARGE HAIL AND TORNADOS  WITH ANY SUPERCELL.  THERE IS

THE THREAT OF LONG LIVED SUPERCELLS ALONG WITH STRONG/DAMAGING

TORNADOES.



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

SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 24050.





...HALES

