Special Marine Warning Issued for Lake Michigan from Sheboygan to Port Washington WI

Source: NOAA · Lake Michigan near Sheboygan to Port Washington WI

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NWS Milwaukee/Sullivan has issued a Special Marine Warning for Lake Michigan nearshore and open waters from Sheboygan to Port Washington WI until 10:30 PM CDT due to strong thunderstorms.

What this NWS weather alert tells you, and what most readers miss

This notice was issued by NOAA on June 24, 2026 and geographically references Lake Michigan near Sheboygan to Port Washington WI. Its severity classification of "high" signals how the issuing agency weighs the risk of harm if no action is taken — "critical" and "high" tier alerts typically carry direct consumer actions, while "medium" and "low" tend toward informational guidance or monitoring advisories. The category it belongs to — Weather Alerts — determines the regulatory framework behind it, which shapes what remedies (refunds, replacements, recalls, evacuations) are available to affected individuals and who holds statutory responsibility for enforcement.

Most readers skim a notice like this, check whether they are personally affected, and move on. The more useful lens is to read it as a data point about the issuing system: how quickly NOAA detected the hazard, how precise the geographic or product-identifier scope is, and whether similar notices have clustered in the same category or region in the last 90 days. Cluster patterns frequently precede a broader regulatory action — a single localized NWS weather alert is isolated; three of them within a quarter often indicate a supply-chain, infrastructure, or seasonal driver that will keep producing notices until something structural changes.

For decision-making, Areazine pairs each alert with the original agency URL, the full agency name, and a timestamp so you can verify the notice against the primary source before acting on it. Tags on this item (weather, alert, Special Marine Warning, Lake Michigan) map to related alerts in the same area of risk — browsing them together gives a clearer picture than any single notice alone, because the shape of an ongoing issue only becomes visible across multiple sequential alerts.

Alert Details

Special Marine Warning issued by NWS Milwaukee/Sullivan WI. Effective from 9:33 PM CDT June 5, 2026 until 10:30 PM CDT June 5, 2026. Severity: Severe. Urgency: Immediate. Certainty: Likely.

Affected Areas

Lake Michigan nearshore and open waters to mid lake from Sheboygan WI to Port Washington WI. Locations impacted include Port Washington.

What You Should Do

Move to safe harbor until hazardous weather passes.

Expected Conditions

At 9:33 PM CDT, strong thunderstorms were located along a line extending from near Two Creeks to 6 nm southwest of Cleveland to 19 nm south of Oshkosh, moving southeast at 50 knots. Hazard: Wind gusts 34 knots or greater and small hail. Impact: Small craft could be damaged in briefly higher winds and suddenly higher waves.

Timeline

Alert in effect from 9:33 PM CDT to 10:30 PM CDT on June 5, 2026.

Original source: NOAA Official Notice ↗

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Frequently Asked Questions

Common questions about this NWS weather alert.

What is this NWS weather alert about?
NWS Milwaukee/Sullivan has issued a Special Marine Warning for Lake Michigan nearshore and open waters from Sheboygan to Port Washington WI until 10:30 PM CDT due to strong thunderstorms.
Which agency issued this alert?
This alert was issued by NOAA. The original notice is available at the source link at the bottom of this article.
How severe is this alert?
This alert is classified as "high" severity. Take precautions and monitor for updates.
What area is affected?
This alert affects Lake Michigan near Sheboygan to Port Washington WI. Check with NOAA for the most current geographic scope.
Where can I find more Weather Alerts updates?
Browse the full Weather Alerts feed on Areazine at areazine.com/weather/ for the latest updates from NOAA and other agencies.