Special Marine Warning for Winthrop Harbor to Wilmette Harbor IL; Wilmette Harbor to Northerly Island IL; Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake +1 more
Official alert fields
What you need to know
- Applies to
- Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake, Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake, Wilmette Harbor to Northerly Island IL, Winthrop Harbor to Wilmette Harbor IL
- Effective
- Ended
- Official severity
- Severe
- Official urgency
- Immediate
- Official certainty
- Likely
What is happening
For the following areas... Nearshore Waters from Winthrop Harbor to Northerly Island... Open Waters from Winthrop Harbor to Michigan City out to Mid Lake... At 1258 PM CDT, a severe thunderstorm capable of producing waterspouts was located 18 nm northeast of Wilmette Harbor, moving east at 20 knots....
What the bulletin says to do
Boaters should seek safe harbor immediately until this storm passes. Wind gusts to nearly 50 knots, large hail, high waves, dangerous lightning, and heavy rain are possible with this storm.
Full official description
Bulletin details
For the following areas... Nearshore Waters from Winthrop Harbor to Northerly Island... Open Waters from Winthrop Harbor to Michigan City out to Mid Lake... At 1258 PM CDT, a severe thunderstorm capable of producing waterspouts was located 18 nm northeast of Wilmette Harbor, moving east at 20 knots. HAZARD...Waterspouts, wind gusts to nearly 50 knots, and large hail. SOURCE...Radar indicated. IMPACT...Waterspouts can easily overturn boats and create locally hazardous seas. Small craft could be damaged in briefly higher winds and suddenly higher waves. Large hail could result in structural damage. Locations impacted include... Harrison-Dever Crib, Wilmette Harbor, Winthrop Harbor, Montrose Harbor, Monroe Harbor, Waukegan Harbor, Belmont Harbor, Diversy Harbor, and DuSable Harbor.
Lifecycle record
Official revisions
- Update
Special Marine Warning issued July 27 at 12:58PM CDT until July 27 at 1:45PM CDT by NWS Chicago IL
Official revision - Update
Special Marine Warning issued July 27 at 11:54AM CDT until July 27 at 1:45PM CDT by NWS Chicago IL
Official revision - Alert
Special Marine Warning issued July 27 at 10:42AM CDT until July 27 at 1:45PM CDT by NWS Chicago IL
Official revision
Source and limitations
Publisher: Weather Alert Watch. Primary source: NWS Chicago IL. This page reorganizes official fields and does not add a forecast or expand the affected area.
- CAP status
- Actual
- Message type
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- Last collected