Alert archive / Michigan / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 64, NWS Grand Rapids, MI

May 18, 20264 counties in Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at May 18, 2026, 2:59 PM EDT for 4 counties in Michigan. It was in force for 46 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, 2:59 PM EDT (18:59 UTC)
Expired: May 18, 2026, 3:45 PM EDT
In force: 46 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Damage threat: Destructive
Hail: 0.75 in
Wind: 80.0 mph

Counties Clinton County, MI, Eaton County, MI, Ingham County, MI, Ionia County, MI

The radar

The Grand Rapids radar (KGRR), 69 km from the middle of the area, began a volume at 18:59 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.

Issued	Product	Office	Lasted
May 18, 12:59 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 7.0 hours before the alert went out and 106 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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 Grand Rapids, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at May 18, 2:15 PM EDT, 44 minutes earlier.

Area forecast discussion, May 18, 2:15 PM EDT, 44 minutes before

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In the hours before

Local storm report, May 18, 2:15 PM EDT, 44 minutes before

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Local storm report, May 18, 2:29 PM EDT, 30 minutes before

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Local storm report, May 18, 2:38 PM EDT, 21 minutes before

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Local storm report, May 18, 2:45 PM EDT, 14 minutes before

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Local storm report, May 18, 2:49 PM EDT, 10 minutes before

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Local storm report, May 18, 2:54 PM EDT, 5 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 4:01 AM EDT	Small Craft Advisory	GRR		42 hr
May 18, 12:30 PM EDT	Special Marine Warning	GRR		103 min
May 18, 12:46 PM EDT	Special Weather Statement	GRR	Lake	59 min
May 18, 1:20 PM EDT	Severe Thunderstorm Warning	GRR	Allegan, Van Buren	55 min
May 18, 1:58 PM EDT	Severe Thunderstorm Warning	GRR	Allegan, Barry, Calhoun, Kalamazoo, Kent, Ottawa	79 min
May 18, 2:24 PM EDT	Severe Thunderstorm Warning Destructive damage threat	GRR	Allegan, Barry, Kent	36 min
May 18, 2:34 PM EDT	Severe Thunderstorm Warning Considerable damage threat	GRR	Calhoun, Eaton, Ionia, Montcalm	70 min
May 18, 3:07 PM EDT	Severe Thunderstorm Warning Considerable damage threat	GRR	Clinton, Gratiot, Ingham, Isabella, Jackson	53 min
May 18, 3:55 PM EDT	Severe Thunderstorm Warning	GRR	Ingham, Jackson	35 min
May 18, 4:00 PM EDT	Severe Thunderstorm Warning	GRR	Clare, Isabella	30 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2026 Every 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.