Wisconsin, 1998

Damaging Winds in Wisconsin, July 21, 1998

July 21, 1998 · NWS MKX · 5 events in 4 counties and zones

Scattered thunderstorms developed in an unstable atmosphere over southcentral Wisconsin in the early afternoon hours. These storms quickly became severe and merged over Walworth County.

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

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The toll

Deaths
0
Injuries
13
Property damage
$2.4 million
Crop damage
$305,000
Events
5

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.

Scattered thunderstorms developed in an unstable atmosphere over southcentral Wisconsin in the early afternoon hours. These storms quickly became severe and merged over Walworth County. Hurricane-force winds were generated over the north side of Elkhorn (Walworth Co.); and the resultant wind damage strongly suggests that winds gusts peaked in the 100 to 110 mph range. Officials in Elkhorn declared a state of emergency and asked for extra help with the cleanup, thanks to hundreds of downed trees and many power lines. Several Elkhorn downtown office buildings suffered some minor damage, while 6 buildings on the north side along Highway 67 had considerable damage (3-minor, 1 major, and 1 destroyed). Thirteen people were injured and 14 vehicles sustained damage. This wicked dowburst then traveld through rural farmland east to the Walworth county line, destroying 3 farm buildings in the process. Altogether, about 27.000 customers in Walworth County lost electrical power. Further east, this wet macroburst became wider and left a path of damage or destruction about 6 to 8 miles wide across northern Kenosha County and southern Racine County. In the Burlington area (Racine Co.), 300 trees were downed and many powerline or poles, leaving 15,000 customers were left without power. A plane tied down at the Burlington airport was tossed over, and rowboats on a local lake were damaged. Elsewhere in southern Racine County, traffic lights were damaged, the Great Lakes Dragway was closed, and the YMCA toboggan slide was destroyed. In Kenosha county 7 semi-trailer tractors were blown over on Interstate-94 west of Somers (Kenosha Co.)! The downburst swath in northern Kenosha County also damaged several corn fields, downed hundreds of trees, leveled a barn near Somers, and damaged several homes. One account was that the town of Somers looked like a bomb exploded ater the storms passed through.

The radar

The Milwaukee radar (KMKX), 33 km away, was scanning. The volume nearest the first event began at 18:11 UTC.

Open the radar archive at this moment

Event by event

5 thunderstorm wind. Local standard time, as filed.

Thunderstorm Wind, Walworth

When
July 21, 12:10 PM CST to 12:25 PM CST
Where
Walworth County, Elkhorn to Spring Prairie
Measured
87 kt (100 mph)
Injuries
12 direct, 0 indirect
Property damage
$1.9 million
Crop damage
$105,000
Reported by
LAW ENFORCEMENT
Coordinates
42.670, -88.550

Thunderstorm Wind, Rock

When
July 21, 12:20 PM CST
Where
Rock County, Beloit
Property damage
$10,000
Reported by
EMERGENCY MANAGER
Coordinates
42.520, -89.030

Thunderstorm Wind, Walworth

When
July 21, 12:20 PM CST to 12:30 PM CST
Where
Walworth County, Sharon to Walworth
Property damage
$5,000
Reported by
LAW ENFORCEMENT
Coordinates
42.500, -88.730

Thunderstorm Wind, Racine

When
July 21, 12:30 PM CST to 1:15 PM CST
Where
Racine County, Burlington to Racine
Measured
87 kt (100 mph)
Injuries
1 direct, 0 indirect
Property damage
$250,000
Reported by
EMERGENCY MANAGER
Coordinates
42.670, -88.270

Thunderstorm Wind, Kenosha

When
July 21, 12:35 PM CST to 1:15 PM CST
Where
Kenosha County, Countywide
Measured
87 kt (100 mph)
Property damage
$200,000
Crop damage
$200,000
Reported by
EMERGENCY MANAGER
Coordinates
42.580, -88.080

What these are

Thunderstorm Wind
Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.

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

The same day elsewhere

More

Every storm in Wisconsin in 1998Every state in 1998This day in weather historyWarnings in Wisconsin, July 1998

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 2026-09-24. Each event’s entry at NCEI: 5662548, 5662546, 5662547, 5662549, 5662550.