478
WHUS53 KLOT 122120
SMWLOT
LMZ740>745-777-779-122315-
/O.NEW.KLOT.MA.W.0034.250812T2120Z-250812T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Chicago/Romeoville
420 PM CDT Tue Aug 12 2025

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 615 PM CDT.

* At 419 PM CDT, NWS meteorologists were tracking strong
  thunderstorms across southwestern Lake Michigan. All were moving
  eastward at about 25 kt. Additional storms were developing over
  northeastern Illinois, and will move over Lake Michigan as well.

  HAZARD...Wind gusts to 40 knots.

  SOURCE...Buoy Observations. A 35 kt wind gust was recently
           measured at the Wilmette Buoy.

  IMPACT...Small craft could be damaged in briefly higher winds and
           suddenly higher waves.

* Locations impacted include...
  Harrison-Dever Crib, Calumet Harbor, Marina Shores at Dune Harbor,
  Michigan City, 59th Street Marina, Hammond Marina, Wilmette Harbor,
  Indiana Harbor, Jackson Park Harbor, Burns Harbor, and DuSable
  Harbor.

Stay in safe harbor immediately as gusty winds and high waves are
expected.


LAT...LON 4163 8716 4162 8732 4161 8733 4162 8733
      4165 8743 4168 8743 4169 8750 4178 8758
      4179 8758 4189 8760 4206 8767 4227 8783
      4234 8783 4247 8738 4246 8702 4213 8696
      4179 8697 4172 8690
TIME...MOT...LOC 2119Z 240DEG 23KT 4223 8743

HAIL...0.00IN
WIND...40KTS

$$

Borchardt