Headline:
Dense Fog Advisory issued September 20 at 3:09AM CDT until September 20 at 9:00AM CDT by NWS Chicago IL
Event:
Dense Fog Advisory
Urgency:
Expected
Effective:
September 20, 2026 - 1:09am
Expires:
September 20, 2026 - 9:15am
Description:
* WHAT...For the Dense Fog Advisory, dense fog will reduce
visibility to one quarter mile or less. For the Small Craft
Advisory, northeast winds to 30 kt and significant waves to 10
ft occasionally to 13 ft expected.
* WHERE...Winthrop Harbor to Calumet Harbor IL.
* WHEN...For the Dense Fog Advisory, until 9 AM CDT this
morning. For the Small Craft Advisory, from 7 AM this morning
to 7 PM CDT Tuesday.
* IMPACTS...Conditions will be hazardous to small craft. Low
visibility will make navigation difficult.
Instruction:
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Area Description:
Winthrop Harbor to Wilmette Harbor IL; Wilmette Harbor to Northerly Island IL; Northerly Island to Calumet Harbor IL
Forcast Office:
NWS Chicago IL
Sender:
w-nws.webmaster@noaa.gov