Flood and Hail in Iowa, July 21, 1999

Name: Flood and Hail in Iowa, July 21, 1999
Start: 1999-07-21T16:00
End: 1999-07-21T19:00
Location: Iowa

July 21, 1999 · NWS DVN · 6 events in 2 counties and zones

2 thunderstorm wind, 2 hail, 1 flood, 1 lightning, as filed by the National Weather Service.

Where it happened

Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. 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: 0
Property damage: $4,000
Crop damage: None recorded
Events: 6

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 radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

2 thunderstorm wind, 2 hail, 1 flood, 1 lightning. Local standard time, as filed.

Flood, Jackson

When: July 21, 4:00 PM CST to 7:00 PM CST
Where: Jackson County, Preston
Reported by: NEWSPAPER
Coordinates: 42.172, -90.574 (the zone’s center; the record gives no point)

Slow-moving thunderstorms produced four to five inches of rainfall, which flooded streets and ditches in Preston.

Thunderstorm Wind, Jackson

When: July 21, 4:35 PM CST
Where: Jackson County, 3 mi W of Bellevue
Measured: 51 kt (59 mph)
Reported by: LAW ENFORCEMENT
Coordinates: 42.270, -90.430

Law enforcement reported a 60 mph thunderstorm gust in rural Bellevue.

Hail, Jackson

When: July 21, 4:35 PM CST
Where: Jackson County, 3 mi W of Bellevue
Measured: 1 in hail
Reported by: LAW ENFORCEMENT
Coordinates: 42.270, -90.430

Law enforcement reported quarter-sized hail in rural Bellevue.

Thunderstorm Wind, Clinton

When: July 21, 5:15 PM CST to 6:15 PM CST
Where: Clinton County, 2 mi S of Charlotte
Property damage: $2,000
Reported by: NEWSPAPER
Coordinates: 41.930, -90.480

Thunderstorm winds downed several large trees, destroyed a large wooden playhouse and dislodged a concrete slab at a farm south of Charlotte.

Lightning, Clinton

When: July 21, 5:15 PM CST to 6:15 PM CST
Where: Clinton County, Clinton
Property damage: $2,000
Reported by: NEWSPAPER
Coordinates: 41.898, -90.532 (the zone’s center; the record gives no point)

Lightning struck a transformer, which resulted in a power outage for several hours at a factory.

Hail, Clinton

When: July 21, 5:35 PM CST
Where: Clinton County, 3 mi NW of Andover
Measured: 0.75 in hail
Reported by: LAW ENFORCEMENT
Coordinates: 42.020, -90.300

Law enforcement reported 3/4 inch hail in rural Andover.

What these are

Flood: Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
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.
Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Lightning: A lightning strike that killed, injured or caused damage.

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

The same day elsewhere

Every storm in Iowa in 1999 Every state in 1999 This day in weather history Warnings in Iowa, July 1999

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: 5719843, 5719840, 5719841, 5719844, 5719845, 5719842.