

739 

WWUS20 KWNS 181725

SEL6

SPC WW 181725

MIZ000-WIZ000-LMZ000-190100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 406

NWS STORM PREDICTION CENTER NORMAN OK

1225 PM CDT MON JUN 18 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       UPPER MICHIGAN

       CENTRAL AND NORTHERN WISCONSIN

       LAKE MICHIGAN



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 1225 PM UNTIL

800 PM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES WEST

NORTHWEST OF CAMP DOUGLAS WISCONSIN TO 50 MILES SOUTHEAST OF

ESCANABA MICHIGAN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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...SCATTERED THUNDERSTORMS HAVE BEGUN TO FORM ALONG ZONE

OF INCREASING CU/TCU FROM SOUTHEAST MN INTO CENTRAL WI.  A MOIST AND

MODERATELY UNSTABLE AIR MASS IS IN PLACE ACROSS THIS REGION...ALONG

WITH STRONG WESTERLY FLOW ALOFT.  STORMS SHOULD INTENSIFY WITH

SUPERCELLS AND BOWING STRUCTURES EXPECTED THROUGH THE AFTERNOON.

LARGE HAIL AND DAMAGING WINDS ARE THE MAIN THREAT.  THERE IS A SMALL

AREA OVER NORTHEAST WI WHERE BACKED LOW LEVEL WINDS MAY ALSO RESULT

IN AN ISOLATED TORNADO OR TWO.



AVIATION...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 27030.





...HART

