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Special Marine Warning for Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore

This alert has ended.Kept for recent context. Do not use it as a current warning.

Official alert fields

What you need to know

Effective
Ended
Official severity
Severe
Official urgency
Immediate
Official certainty
Likely

What is happening

For the following areas... Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore... At 657 PM EDT, a severe thunderstorm was located 12 nm west of The Eastern Lake Superior Buoy, moving southeast at 20 knots....

What the bulletin says to do

Move to safe harbor until hazardous weather passes. Frequent lightning is occurring with this storm. If caught on the open water stay below deck if possible, keep away from ungrounded metal objects.

Read official NWS bulletin

Full official description

Bulletin details

For the following areas... Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore... At 657 PM EDT, a severe thunderstorm was located 12 nm west of The Eastern Lake Superior Buoy, moving southeast at 20 knots. HAZARD...Wind gusts 34 knots or greater and large hail. SOURCE...Radar indicated. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. Large hail could result in structural damage. The severe thunderstorm will remain over mainly open waters.

Lifecycle record

Official revisions

3 captured
  1. Update

    Special Marine Warning issued July 26 at 6:58PM EDT until July 26 at 7:15PM EDT by NWS Marquette MI

    Official revision
  2. Update

    Special Marine Warning issued July 26 at 6:32PM EDT until July 26 at 7:15PM EDT by NWS Marquette MI

    Official revision
  3. Alert

    Special Marine Warning issued July 26 at 6:12PM EDT until July 26 at 7:15PM EDT by NWS Marquette MI

    Official revision

Source and limitations

Publisher: Weather Alert Watch. Primary source: NWS Marquette MI. This page reorganizes official fields and does not add a forecast or expand the affected area.

CAP status
Actual
Message type
Update
Last collected
Methodology and corrections