Marine Thunderstorm Wind in Lake St. Clair, May 9, 2026

Name: Marine Thunderstorm Wind in Lake St. Clair, May 9, 2026
Start: 2026-05-09T15:35
End: 2026-05-09T15:35
Location: Lake St. Clair

May 9, 2026 · NWS DTX · 1 event in 1 county or zone

A thunderstorm moving across the Detroit River produced a wind gust of 35 knots.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 1

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 DTX wrote it up.

A thunderstorm moving across the Detroit River produced a wind gust of 35 knots.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Detroit, MI wrote its last area forecast discussion before the first event at May 9, 2:37 PM EST, 58 minutes earlier.

Area forecast discussion, May 9, 2:37 PM EST, 58 minutes before

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Hazardous weather outlook, May 9, 3:24 AM EST, 12 hours 11 minutes before

Hazardous Weather Outlook
National Weather Service Detroit/Pontiac MI
424 AM EDT Sat May 9 2026

MIZ047>049-053>055-060>063-068>070-075-076-082-083-100930-
Midland-Bay-Huron-Saginaw-Tuscola-Sanilac-Shiawassee-Genesee-Lapeer-
St. Clair-Livingston-Oakland-Macomb-Washtenaw-Wayne-Lenawee-Monroe-
424 AM EDT Sat May 9 2026

This hazardous weather outlook is for southeast Michigan.

.DAY ONE...Today and Tonight

Isolated to scattered thunderstorms are expected to develop this
afternoon. There is a marginal risk of severe weather along and south
of I-69. Hail up to 1 inch in diameter and wind gusts up to 60 mph
are the primary hazards. Storm motion looks to east at 40 mph.
Thunderstorms should end by 6 PM or so.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

LCZ460-LEZ444-LHZ361>363-421-422-441>443-462>464-100930-
Lake St Clair-
Michigan Waters of Lake Erie from Detroit River to North Cape MI-
Lake Huron from 5NM east of Mackinac Bridge to Presque Isle Lt
beyond 5 NM off shore-
Lake Huron from Presque Isle Light to Sturgeon Point MI beyond 5NM
off shore-
Lake Huron from Sturgeon Point to Alabaster MI beyond 5NM off shore-
Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw
Bay-Inner Saginaw Bay SW of Point Au Gres to Bay Port MI-
Port Austin to Harbor Beach MI-Harbor Beach to Port Sanilac MI-
Port Sanilac to Port Huron MI-
Lake Huron from Port Austin to Harbor Beach beyond 5NM Off Shore-
Lake Huron from Harbor Beach to Port Sanilac beyond 5NM Off Shore-
Lake Huron from Port Sanilac to Port Huron beyond 5NM Off Shore-
424 AM EDT Sat May 9 2026

This hazardous weather outlook is for portions of Lake Erie, Lake
Huron and Lake St Clair.

.DAY ONE...Today and Tonight

Isolated to scattered thunderstorms are expected to develop this
afternoon. There is a marginal risk of severe weather over far
southern Lake Huron, Lake St. Clair and Lake Erie. Hail up to 1 inch
in diameter and wind gusts up to 50 knots are the primary hazards.
Storm motion looks to east at 35 knots.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

You can obtain your latest National Weather Service forecasts online
at www.weather.gov/detroit.

SF

In the hours before

Special weather statement, May 9, 12:11 PM EST, 3 hours 24 minutes before

Special Weather Statement
National Weather Service Detroit/Pontiac MI
111 PM EDT Sat May 9 2026

MIZ060-061-069-091815-
Shiawassee MI-Genesee MI-Oakland MI-
111 PM EDT Sat May 9 2026

...STRONG THUNDERSTORMS WILL IMPACT NORTHWESTERN OAKLAND...
SOUTHEASTERN SHIAWASSEE AND GENESEE COUNTIES THROUGH 215 PM EDT...

At 111 PM EDT, Doppler radar was tracking a cluster of strong
thunderstorms over Swartz Creek to Perry, moving east at 35 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Flint, Fenton, Flushing, Grand Blanc, Holly, Davison, Durand, Burton,
Swartz Creek, Linden, Goodrich, Morrice, Byron, Bancroft, Lennon,
Gaines, Lake Fenton, Beecher, Atlas, and Argentine.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4304 8400 4312 8346 4279 8345 4278 8422
TIME...MOT...LOC 1711Z 259DEG 30KT 4299 8387

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

KDK

Special weather statement, May 9, 12:43 PM EST, 2 hours 52 minutes before

Special Weather Statement
National Weather Service Detroit/Pontiac MI
143 PM EDT Sat May 9 2026

MIZ062-091845-
Lapeer MI-
143 PM EDT Sat May 9 2026

...STRONG THUNDERSTORMS WILL IMPACT LAPEER COUNTY THROUGH 245 PM
EDT...

At 143 PM EDT, Doppler radar was tracking a cluster of strong
thunderstorms from Comlumbiaville to over Davison, moving east at 40
mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Lapeer, Imlay City, Almont, Columbiaville, Hadley, Dryden, Metamora,
Lum, Attica, Elba, Goodland Township, Thornville, and Kings Mill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4288 8345 4311 8346 4319 8333 4320 8300
      4289 8299
TIME...MOT...LOC 1743Z 266DEG 36KT 4301 8350

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

KDK

Local storm report, May 9, 1:43 PM EST, 1 hour 52 minutes before

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Special weather statement, May 9, 1:46 PM EST, 1 hour 49 minutes before

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The radar

The Detroit radar (KDTX), 72 km away, was scanning. The volume nearest the first event began at 20:33 UTC.

Open the radar archive at this moment

Event by event

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

Marine Thunderstorm Wind, Detroit River

When: May 9, 3:35 PM EST
Where: Detroit River forecast zone, 5.61 mi S of Grosse Ile
Measured: 35 kt (40 mph) measured gust
Reported by: ASOS
Coordinates: 42.099, -83.162

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

Every storm in Lake St. Clair in 2026 Every state in 2026 This 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: 1338320.