

988 

WWUS20 KWNS 020109

SEL2

SPC WW 020109

IAZ000-MIZ000-MNZ000-WIZ000-LSZ000-020700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 582

NWS STORM PREDICTION CENTER NORMAN OK

810 PM CDT FRI JUL 1 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHERN IOWA

       WESTERN UPPER MICHIGAN

       PARTS OF SOUTHEAST MINNESOTA

       PARTS OF WESTERN AND NORTHERN WISCONSIN

       LAKE SUPERIOR



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 810 PM

UNTIL 200 AM 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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTHWEST OF

MARQUETTE MICHIGAN TO 45 MILES EAST SOUTHEAST OF FORT DODGE IOWA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 581...



DISCUSSION...SEVERE THUNDERSTORMS CONTINUE TO MOVE EWD INTO WATCH

AREA WHERE THE AIR MASS REMAINS VERY UNSTABLE WITH MLCAPES AOA 3500

J/KG.  STORM MODE HAS TRANSITIONED INTO LINES AND BOWING SEGMENTS

WITH DAMAGING WINDS THE PRIMARY THREAT.  NRN PORTION MOVING MUCH

FASTER THAN SRN PORTION OF STORMS WITH A HIGHER WIND DAMAGE THREAT.



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 550. MEAN STORM

MOTION VECTOR 24030.





...HALES

