Alert archive / Michigan / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 32, NWS Detroit, MI

May 18, 2026Shiawassee County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at May 18, 2026, 3:27 PM EDT for Shiawassee County, Michigan. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 18, 2026, 3:27 PM EDT (19:27 UTC)
Expired
May 18, 2026, 4:30 PM EDT
In force
63 min
Issued by
NWS Detroit, MI
Area
Storm-based polygon
Damage threat
Considerable
Hail
0.75 in
Wind
70.0 mph

County Shiawassee County, MI

The radar

The Detroit radar (KDTX), 62 km from the middle of the area, began a volume at 19:26 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 18, 12:59 PM EDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 7.5 hours before the alert went out and 64 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Detroit, MI at 12:00Z on 2026-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 97 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Detroit, MI at 12:00Z on 2026-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
97 J/kg
Mixed-layer CIN
-412 J/kg
Mixed-layer LCL
1455 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
15 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at May 18, 1:58 PM EDT, 1 hour 29 minutes earlier.

Area forecast discussion, May 18, 1:58 PM EDT, 1 hour 29 minutes before
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Hazardous weather outlook, May 18, 3:45 AM EDT, 11 hours 42 minutes before
Hazardous Weather Outlook
National Weather Service Detroit/Pontiac MI
345 AM EDT Mon May 18 2026

MIZ047>049-053>055-060>063-068>070-075-076-082-083-190745-
Midland-Bay-Huron-Saginaw-Tuscola-Sanilac-Shiawassee-Genesee-Lapeer-
St. Clair-Livingston-Oakland-Macomb-Washtenaw-Wayne-Lenawee-Monroe-
345 AM EDT Mon May 18 2026

This hazardous weather outlook is for southeast Michigan.

.DAY ONE...Today and Tonight

The potential exists for severe thunderstorms to develop mainly
between 3 and 9 pm today. Storms will be capable of producing
damaging wind gusts to 60 mph, hail to one inch in diameter and
isolated tornadoes. Storms will track from west to east at 45 to 50
mph.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

The risk for severe weather exists again Tuesday mainly during the
afternoon and evening hours, with strong winds, large hail and heavy
rainfall possible.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed late this afternoon and evening.

LCZ460-LEZ444-LHZ361>363-421-422-441>443-462>464-190745-
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-
345 AM EDT Mon May 18 2026

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

.DAY ONE...Today and Tonight

The potential exists for severe thunderstorms to develop mainly
between 3 and 9 pm today. Storms will be capable of producing
damaging wind gusts to 50 knots, hail to one inch in diameter and
isolated tornadoes. Storms will track from west to east at 40 to 45
knots.

A small craft advisory is in effect through this evening. Refer to
the latest marine forecast for details.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

The risk for severe weather exists again Tuesday mainly during the
afternoon and evening hours, with strong winds, large hail and heavy
rainfall possible.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed late this afternoon and evening.

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

MR

In the hours before

Local storm report, May 18, 11:09 AM EDT, 4 hours 18 minutes before
Preliminary Local Storm Report
National Weather Service Detroit/Pontiac MI
1109 AM EDT Mon May 18 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0603 PM     Tstm Wnd Dmg     1 E Bay Park            43.65N  83.56W
05/17/2026                   Tuscola            MI   Public

            Parts of a roof removed from a pole barn and blown
            across the property, one large tree split, and other
            trees with branches down.

&&

Event Number DTX2600462

drk
Special weather statement, May 18, 3:00 PM EDT, 27 minutes before
Special Weather Statement
National Weather Service Detroit/Pontiac MI
300 PM EDT Mon May 18 2026

MIZ069-181930-
Oakland MI-
300 PM EDT Mon May 18 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN OAKLAND COUNTY
THROUGH 330 PM EDT...

At 300 PM EDT, Doppler radar was tracking a strong thunderstorm near
Livonia, moving northeast at 30 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Troy, Southfield, Pontiac, Novi, Royal Oak, Birmingham, Rochester,
Northville, Detroit Zoo, West Bloomfield, Farmington Hills, Rochester
Hills, Madison Heights, Oak Park, Auburn Hills, Ferndale, Hazel Park,
Berkley, Wixom, and Clawson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southeastern Michigan.

&&

LAT...LON 4244 8354 4266 8351 4273 8310 4245 8309
TIME...MOT...LOC 1900Z 222DEG 25KT 4244 8335

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

SF

The office that day

Everything else NWS Detroit, MI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 18, 2:42 PM EDTSevere Thunderstorm WarningDTXWashtenaw, Wayne63 min
May 18, 3:00 PM EDTSpecial Weather StatementDTXOakland30 min
May 18, 3:25 PM EDTSevere Thunderstorm WarningDTXLenawee80 min
May 18, 3:33 PM EDTSevere Thunderstorm Warning Considerable damage threatDTXBay, Midland, Saginaw57 min
May 18, 3:36 PM EDTSevere Thunderstorm WarningDTXMacomb34 min
May 18, 3:42 PM EDTSpecial Marine WarningDTX93 min
May 18, 3:42 PM EDTSpecial Weather StatementDTXHuron48 min
May 18, 3:42 PM EDTSevere Thunderstorm WarningDTXLivingston78 min
May 18, 3:53 PM EDTSevere Thunderstorm Warning Considerable damage threatDTXGenesee67 min
May 18, 3:53 PM EDTSevere Thunderstorm WarningDTXSaint Clair34 min
May 18, 3:59 PM EDTSpecial Marine WarningDTX91 min
May 18, 4:00 PM EDTSevere Thunderstorm WarningDTXMonroe75 min
May 18, 4:03 PM EDTSpecial Marine WarningDTX87 min
May 18, 4:05 PM EDTSevere Thunderstorm WarningDTXWashtenaw60 min
May 18, 4:07 PM EDTSevere Thunderstorm Warning Considerable damage threatDTXTuscola68 min
May 18, 4:10 PM EDTSpecial Marine WarningDTX2 hr
May 18, 4:18 PM EDTSevere Thunderstorm WarningDTXOakland, Wayne72 min
May 18, 4:24 PM EDTSevere Thunderstorm Warning Considerable damage threatDTXLapeer66 min
May 18, 4:43 PM EDTSevere Thunderstorm WarningDTXHuron62 min
May 18, 4:54 PM EDTSevere Thunderstorm WarningDTXSanilac81 min
May 18, 4:58 PM EDTSpecial Marine WarningDTX92 min
May 18, 5:00 PM EDTSevere Thunderstorm WarningDTXMacomb, Saint Clair75 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2026Every severe thunderstorm warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.