

000 

WWUS20 KWNS 082222

SEL3

SPC WW 082222

MIZ000-LHZ000-LMZ000-LSZ000-090700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 493

NWS STORM PREDICTION CENTER NORMAN OK

625 PM EDT SUN JUL 8 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN LOWER AND EASTERN UPPER MICHIGAN

       LAKE HURON

       LAKE MICHIGAN

       LAKE SUPERIOR



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 625 PM UNTIL

300 AM EDT.



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 85

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

OF TRAVERSE CITY MICHIGAN TO 25 MILES NORTHEAST OF ALPENA

MICHIGAN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 492...



DISCUSSION...SCATTERED INTENSE THUNDERSTORMS ARE OCCURRING OVER

NORTHERN WI AND WESTERN UPPER MI.  THESE STORMS WILL PROGRESS

EASTWARD ACROSS LAKE MI AND INTO NORTHERN LOWER MI DURING THE NEXT

FEW HOURS.  STRONG INSTABILITY AND FAVORABLE DEEP LAYER VERTICAL

SHEAR WILL PROMOTE A RISK OF ORGANIZED CLUSTERS OF SEVERE STORMS

CAPABLE OF DAMAGING WINDS AND LARGE HAIL.



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

