A narrow line of thunderstorms developed ahead of an advancing warm front over southeast Wisconsin and northeast Illinois during the evening of Monday, July 20th. The thunderstorms moved east along the warm front around 35 mph and passed across southwest Lower Michigan between 8:00 pm and Midnight EDT.
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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.
The episode as NWS GRR wrote it up.
A narrow line of thunderstorms developed ahead of an advancing warm front over southeast Wisconsin and northeast Illinois during the evening of Monday, July 20th. The thunderstorms moved east along the warm front around 35 mph and passed across southwest Lower Michigan between 8:00 pm and Midnight EDT. The thunderstorms produced scattered reports of wind damage across Allegan, Ottawa, Van Buren, Barry, Kalamazoo, and Calhoun Counties. A wind gust to 60 mph was measured in Allegan. Most reports consisted of downed trees and power lines with scattered power outages the result. No injuries were reported and the only structural damage reported took place in the City of Battle Creek, when a tree fell over onto a house.
The Grand Rapids radar (KGRR), 48 km away, was scanning. The volume nearest the first event began at 02:12 UTC.
6 thunderstorm wind. Local standard time, as filed.
Trees and power lines down. No damage estimates available. Numerous reports across the southern half of Allegan County.
Power lines were downed near Hudsonville, in Georgetown Township. A damage estimate was not available.
12 inch diameter tree limb down.
Tree limb down.
Power lines and trees down around Vine and Pearl Streets. A damage estimate was not available.
Tree down on house, unknown property damage.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 1998Every state in 1998This day in weather historyWarnings in Michigan, July 1998
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 2026-09-24. Each event’s entry at NCEI: 5662091, 5662096, 5662092, 5662093, 5662094, 5662095.