Wisconsin, 1996

Flash Flood in Wisconsin, July 18, 1996

July 18, 1996 · NWS MKX · 1 event in 1 county or zone

Flash flooding occurred in the villages of Blanchardville and Argyle due to rainfalls of 6 to 7 inches within a 4 to 5 hour period. These rains were the result of thunderstorms developing in Lafayette and Iowa counties, and then training ESE into the Blanchardville area.

Where it happened

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The toll

Deaths
0
Injuries
0
Property damage
$480,000
Crop damage
$100,000
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 MKX wrote it up.

Flash flooding occurred in the villages of Blanchardville and Argyle due to rainfalls of 6 to 7 inches within a 4 to 5 hour period. These rains were the result of thunderstorms developing in Lafayette and Iowa counties, and then training ESE into the Blanchardville area. In Blanchardville a bridge was washed out, and two roads under construction sustained major damage to their curb and gutter segments. Just east of Argyle, on Highway 81, a 200 foot section of the highway's gravel shoulder was washed away by flood waters. Rural farm land, especially along the east branch of the Pecatonica River in eastern Lafayette county, also sustained some soil and crop damage. In Blanchardville, the east branch of the Pecatonica River crested at 14.47 feet at 2245CST on the 18th, or 3.47 feet above flood stage. At this location the river exceed flood stage at 0300CST on the 18th and finally went below flood stage at 2045CST on July 19th.

The radar

The Quad Cities radar (KDVN), 122 km away, was scanning. The volume nearest the first event began at 06:57 UTC.

Open the radar archive at this moment

Event by event

1 flash flood. Local standard time, as filed.

Flash Flood, Lafayette

When
July 18, 1:00 AM CST to 4:00 AM CST
Where
Lafayette County, Blanchardville
Property damage
$480,000
Crop damage
$100,000
Coordinates
42.661, -90.132 (the zone’s center; the record gives no point)

What these are

Flash Flood
Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

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

The same day elsewhere

More

Every storm in Wisconsin in 1996Every state in 1996This day in weather historyWarnings in Wisconsin, July 1996

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: 5558498.