

492 

WWUS20 KWNS 192243

SEL4

SPC WW 192243

WIZ000-LMZ000-200600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 664

NWS STORM PREDICTION CENTER NORMAN OK

545 PM CDT TUE JUL 19 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN AND CENTRAL WISCONSIN

       LAKE MICHIGAN



EFFECTIVE THIS TUESDAY AFTERNOON AND WEDNESDAY MORNING FROM 545

PM UNTIL 100 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 85 MILES WEST

NORTHWEST OF WAUSAU WISCONSIN TO 35 MILES SOUTH SOUTHEAST OF

GREEN BAY WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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...A CLUSTER OF INTENSE THUNDERSTORMS OVER NORTHERN WI IS

EXPECTED TO ACCELERATE AND TRACK SOUTHEASTWARD ACROSS THE WATCH AREA

THIS AFTERNOON AND EVENING.  A VERY UNSTABLE AIR MASS /MLCAPE VALUES

OF 4000+ J/KG/ AND 30-40 KNOTS OF MID LEVEL WINDS WILL PROMOTE FAST

MOVING STORMS CAPABLE OF LOCALLY DAMAGING WINDS AND HAIL.  BOW ECHO

FORMATION IS POSSIBLE...WHICH WOULD INCREASE THE POTENTIAL OF A

WIDESPREAD WIND EVENT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 30035.





...HART

