) A moist and unstable environment produced conditions ripe for severe weather, as clusters of intense thunderstorms moved over eastern Iowa during the afternoon and evening hours. Thunderstorm wind gusts up to 60 mph occurred over the area, with hail up to 3/4 inch.
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.
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 DVN wrote it up.
Summary for 7/23/99: (For additional details, see individual entries for the date.) A moist and unstable environment produced conditions ripe for severe weather, as clusters of intense thunderstorms moved over eastern Iowa during the afternoon and evening hours. Thunderstorm wind gusts up to 60 mph occurred over the area, with hail up to 3/4 inch. High winds damaged a large tarp covering the Government Bridge in the Quad Cities, and downed large trees and power lines. Very heavy rainfall also produced urban and small stream flooding over Scott and Buchanan counties.
The Quad Cities radar (KDVN), 141 km away, was scanning. The volume nearest the first event began at 20:32 UTC.
7 thunderstorm wind, 2 flood, 1 hail. Local standard time, as filed.
Urban and small stream flooding across Buchanan County resulted in the closing of a portion of U.S. Highway 150 and other county roads.
Thunderstorm winds downed large tree limbs and power lines in Tipton, which resulted in a power outage in the community.
60 mph thunderstorm wind gust reported in New London.
Law enforcement reported a 60 mph thunderstorm wind gust in Stanwood.
Law enforcement reported a 60 mph thunderstrom wind gust in Columbus Junction High winds downed large trees and power lines.
Torrential rains produced street flooding in Davenport. Heavy rain in Eldridge leaked through latches on the roof of the high school auditorium, and dripped onto the stage.
Penny-sized hail fell in Davenport.
A 58 mph thunderstorm wind gust was recorded at the Davenport Airport.
A 60 mph thunderstorm gust downed power lines in Eldridge, which resulted in a power outage in the community.
A NWS spotter reported a 60 mph thunderstorm wind gust in Davenport. The high winds damaged a large tarp covering the Government Bridge in the Quad Cities.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 1999Every state in 1999This day in weather historyWarnings in Iowa, July 1999
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: 5719583, 5718400, 5718399, 5718360, 5718361, 5718398, 5718362, 5718363, 5719584, 5718397.