

189 

WWUS20 KWNS 040348

SEL5

SPC WW 040348

MIZ000-WIZ000-LSZ000-041100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 425

NWS STORM PREDICTION CENTER NORMAN OK

1050 PM CDT FRI JUN 3 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       UPPER PENINSULA OF MICHIGAN

       NORTHEAST WISCONSIN

       LAKE SUPERIOR



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1050 PM

UNTIL 600 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 80 MILES SOUTHWEST

OF HOUGHTON MICHIGAN TO 100 MILES EAST NORTHEAST OF ESCANABA

MICHIGAN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 423...WW 424...



DISCUSSION...ELEVATED TSTMS /INCLUDING SUPERCELLS/ OVER WRN LAKE

SUPERIOR ARE EXPECTED TO PERSIST OVERNIGHT...AND POSSIBLY INCREASE

IN AREAL COVERAGE ALONG THE NRN FRINGE OF THE CAP WHERE LOW-LEVEL

WAA WILL FOCUS FORCING FOR ASCENT.  THE COMBINATION OF MUCAPE OF

2000-3000 J/KG AND EFFECTIVE BULK SHEAR OF 40-45 KT WILL SERVE TO

MAINTAIN ORGANIZED STORM MODES WITH A POTENTIAL FOR UPSCALE GROWTH

INTO AN MCS.  WHILE LARGE HAIL WILL INITIALLY BE THE PRIMARY

HAZARD...DAMAGING WINDS WILL BECOME INCREASINGLY POSSIBLE IF STORMS

CAN ORGANIZE A COLD POOL.



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.





...MEAD

