Severe thunderstorms Lake Michigan bound; Special Marine Warning issued for all nearshore waters of Chicago and northern Indiana until 9:00 pm CDT

Weather
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE
703 PM CDT TUE AUG 10 2021

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* SPECIAL MARINE WARNING FOR...

  NEARSHORE WATERS FROM WINTHROP HARBOR TO CALUMET HARBOR...
  NEARSHORE WATERS FROM CALUMET HARBOR TO MICHIGAN CITY...
  OPEN WATERS FROM WINTHROP HARBOR TO MICHIGAN CITY OUT TO MID
LAKE...

* UNTIL 900 PM CDT.

* AT 702 PM CDT, SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 7 NM NORTHWEST OF MCHENRY TO 9 NM SOUTHWEST OF 
  ELGIN TO 10 NM WEST OF JOLIET, MOVING EAST AT 50 KNOTS. THIS 
  STORMS HAVE A HISTORY OF WINDS IN EXCESS OF 50 KNOTS INLAND. 
  STRONG WINDS WILL LINGER BEHIND THE MAIN LINE OF STORMS.

  HAZARD...WIND GUSTS IN EXCESS OF 50 KNOTS AND SMALL HAIL.

  SOURCE...RADAR INDICATED.

  IMPACT...BOATS COULD SUFFER SIGNIFICANT STRUCTURAL DAMAGE IN HIGH 
           WINDS. SMALL CRAFT COULD CAPSIZE IN SUDDENLY HIGHER 
           WAVES.

* LOCATIONS IMPACTED INCLUDE...
  HARRISON-DEVER CRIB, WILMETTE HARBOR, 31ST STREET HARBOR, MONROE
  HARBOR, BURNS HARBOR, CALUMET HARBOR, WINTHROP HARBOR, INDIANA
  HARBOR, MONTROSE HARBOR, WAUKEGAN HARBOR, BURNHAM HARBOR AND
  HAMMOND MARINA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO SAFE HARBOR IMMEDIATELY AS GUSTY WINDS AND HIGH WAVES ARE
EXPECTED.

FREQUENT LIGHTNING IS OCCURRING WITH THESE STORMS. IF CAUGHT ON THE
OPEN WATER STAY BELOW DECK IF POSSIBLE, KEEP AWAY FROM UNGROUNDED
METAL OBJECTS.

HAIL...<.75IN

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