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Special Marine Warning for Outer Apostle Islands Beyond 5 NM from Mainland; Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM

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 west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM... Outer Apostle Islands Beyond 5 NM from Mainland... At 729 AM CDT, a severe thunderstorm was located 7 nm northwest of Devils Island, or 39 nm west of The Western Lake Superior Buoy, moving southeast at 25...

What the bulletin says to do

Move to safe harbor until hazardous weather passes.

Read official NWS bulletin

Full official description

Bulletin details

For the following areas... Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM... Outer Apostle Islands Beyond 5 NM from Mainland... At 729 AM CDT, a severe thunderstorm was located 7 nm northwest of Devils Island, or 39 nm west of The Western Lake Superior Buoy, moving southeast at 25 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. Locations impacted include... South Twin Island, North Twin Island, Devils Island, and Rocky Island.

Lifecycle record

Official revisions

3 captured
  1. Update

    Special Marine Warning issued July 27 at 7:29AM CDT until July 27 at 7:45AM CDT by NWS Duluth MN

    Official revision
  2. Update

    Special Marine Warning issued July 27 at 7:18AM CDT until July 27 at 7:45AM CDT by NWS Duluth MN

    Official revision
  3. Alert

    Special Marine Warning issued July 27 at 6:41AM CDT until July 27 at 7:45AM CDT by NWS Duluth MN

    Official revision

Source and limitations

Publisher: Weather Alert Watch. Primary source: NWS Duluth MN. 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