Lake Michigan, 2012

Marine Thunderstorm Winds in Lake Michigan, September 4, 2012

September 4, 2012 · NWS MKX · 2 events in 2 counties and zones

A broken line of thunderstorms with a few embedded strong thunderstorms moved across the near shore waters of Lake Michigan off southeast Wisconsin. These thunderstorms caused several wind gusts exceeding 33 knots.

Where it happened

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
2

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS MKX wrote it up.

A broken line of thunderstorms with a few embedded strong thunderstorms moved across the near shore waters of Lake Michigan off southeast Wisconsin. These thunderstorms caused several wind gusts exceeding 33 knots. Gusty winds lingering behind the line of the thunderstorms also caused a few high wind gusts.

The radar

The Milwaukee radar (KMKX), 74 km away, was scanning. The volume nearest the first event began at 03:11 UTC.

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Event by event

2 marine thunderstorm wind. Local standard time, as filed.

Marine Thunderstorm Wind, Wind Pt Lt Wi to Winthrop Hbr Il

When
September 4, 9:10 PM CST to 9:20 PM CST
Where
Wind Pt Lt Wi to Winthrop Hbr Il forecast zone, 1.24 mi ENE of Kenosha
Measured
38 kt (44 mph) measured gust
Reported by
C-MAN Station
Coordinates
42.589, -87.809

The C-Man station at the Kenosha Harbor (KNSW3) reported 10 minutes of wind gusts to 38-39 knots as the thunderstorms moved across the shore areas.

Marine Thunderstorm Wind, Pt Washington to North Pt Lt Wi

When
September 4, 11:10 PM CST to 11:20 PM CST
Where
Pt Washington to North Pt Lt Wi forecast zone, 0.56 mi N of Port Washington
Measured
40 kt (46 mph) measured gust
Reported by
C-MAN Station
Coordinates
43.388, -87.868

The C-Man station at the Port Washington harbor (PWAW3) reported 10 minutes of wind gusts of 35 to 40 knots. Sustained winds at the time were 25 to 32 knots. The main line of thunderstorms had already pushed through the area. These strong winds were caused by lingering gusty winds associated with a Wake Low event.

What these are

Marine Thunderstorm Wind
Thunderstorm winds of 34 knots or more over coastal or lake waters.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Lake Michigan in 2012Every state in 2012This day in weather history

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 397707, 397711.