Thunderstorm Wind, Delaware
- When
- August 23, 11:45 AM CST
- Where
- Delaware County, 4 mi N of Dundee
- Measured
- 55 kt (63 mph)
- Reported by
- PARK/FOREST SERVICE
- Coordinates
- 42.630, -91.550
A tree 24 inches in diameter and 40 feet tall was downed.
Flooding and Hail in Iowa, August 23, 1999
2 thunderstorm wind, 2 flood, 2 hail, 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
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- 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 La Crosse radar (KARX), 136 km away, was scanning. The volume nearest the first event began at 17:44 UTC.
Event by event
2 thunderstorm wind, 2 flood, 2 hail. Local standard time, as filed.
Flood, Buchanan
- When
- August 23, 11:45 AM CST
- Where
- Buchanan County, Fairbank
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 42.471, -91.838 (the zone’s center; the record gives no point)
1.57 inches of rain in 30 minutes produced some yard flooding.
Thunderstorm Wind, Buchanan
- When
- August 23, 12:04 PM CST
- Where
- Buchanan County, Lamont
- Measured
- 52 kt (60 mph)
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 42.600, -91.630
Several tree limbs downed.
Hail, Delaware
- When
- August 23, 12:30 PM CST
- Where
- Delaware County, Manchester
- Measured
- 0.75 in hail
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 42.480, -91.450
Hail, Scott
- When
- August 23, 3:00 PM CST
- Where
- Scott County, Pleasant Vly
- Measured
- 0.75 in hail
- Reported by
- AMATEUR RADIO
- Coordinates
- 41.570, -90.430
Flood, Scott
- When
- August 23, 3:05 PM CST
- Where
- Scott County, Davenport
- Reported by
- AMATEUR RADIO
- Coordinates
- 41.637, -90.623 (the zone’s center; the record gives no point)
Torrential rain of nearly 3 inches in 30 minutes resulted in standing water of 12 to 18 inches on some streets.
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.
- Flood
- Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Hail and Damaging Winds in Oklahoma, August 23, 1999
- Hail and Damaging Winds in Oklahoma, August 23, 1999
- Flash Flooding in Puerto Rico, August 23, 1999
- Wildfire in California, August 23 to 31, 1999
- Flash Flood in Colorado, August 23, 1999
- Hail and Damaging Winds in Illinois, August 23, 1999
- Tornadoes and Flash Flooding in Texas, August 23 to 24, 1999
- Wildfire in California, August 23 to 29, 1999
- Wildfire in California, August 23 to 29, 1999
- Lightning Strike in Maine, August 23, 1999
- Flood and Damaging Winds in Illinois, August 23, 1999
- Flash Flooding and Hail in Virginia, August 23, 1999
More
Every storm in Iowa in 1999Every state in 1999This day in weather historyWarnings in Iowa, August 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: 5718406, 5718591, 5718407, 5718408, 5718409, 5718590.