Delaware County, Iowa
Tornadoes, hail, floods and severe storms recorded here between 1955 and 2026, from NOAA's Storm Events Database. Search an address to see which tornadoes came closest to it.
40
Tornado reports
152
Hail reports
44
Floods since 1996
697
All events
1
Deaths
$96.3M
Property damage
Tornado paths in Delaware County
The part of each tornado’s path NOAA recorded in this county, 40 in all. Zoom in and the paths widen to their surveyed width.
EF0EF1EF2EF3EF4EF5Unrated
Year by year
All storm eventsTornadoes
NOAA's storm database records tornadoes back to 1950 and hail and thunderstorm wind back to 1955, but floods only from 1996 on. Older floods are missing here. For those, the U.S. Geological Survey's stream gauge records and flood reports are the place to look.
Most significant events
The strongest tornadoes, deadliest events and biggest damage here, up to 50.
A trained spotter in Delaware County reported 3.5 inches of snow at 9 AM CST 2 miles southwest of Colesburg. Snow was continuing to fall. The Delaware County Emergency Manager relayed that there were over 60 traffic accidents in the area. One of these accidents resulted in a fata…
Record flooding on the Maquoketa River resulted in the failure of the earthen berm on the south side of the Lake Delhi/Hartwick Lake dam during the late morning and afternoon of July 24. The dam failure resulted in flash flooding of residences along the Maquoketa River immediatel…
After about 10 inches of rain fell in the upper Maquoketa River basin, the river surged to record stage levels. The initial impact off the surging river levels was seen in Manchester, where portions of the business district as well as numerous homes were affected by flood waters.…
Also reported by law enforcement
Thunderstorm Wind Thunderstorm Wind
Tree down near the intersection of County Road 64 and 200th Ave. Time estimated by radar.
Thunderstorm Wind Thunderstorm Wind
Powerlines leaning due to strong winds.
Thunderstorm Wind Thunderstorm Wind
Two power poles snapped north of town near Hwy 13 by thunderstorm winds. The of the time of the event was estimated using radar.
Hail Hail
Thunderstorm Wind Thunderstorm Wind
The time was estimated using radar data.
Flash Flood Flash Flood
Emergency management reported several roads washed out.
Flash Flood Flash Flood
Law enforcement reported part of the road washed out with water over much of the road, resulting in closing the road off by barricade.
Thunderstorm Wind Thunderstorm Wind
A small tree and some limbs were blown down.
Thunderstorm Wind Thunderstorm Wind
Lots of trees blown down, and flag poles folded in half. The time was estimated from radar data.
Thunderstorm Wind Thunderstorm Wind
Significant damage to farm buildings. Wooden stakes impaled into the ground.
Thunderstorm Wind Thunderstorm Wind
Machine shed and hardwood tree branches snapped due to downburst winds.
Hail Hail
Report received from Mping.
Hail Hail
Report received from Mping.
Tornado EF1 Tornado
EF1 tornado with peak winds of 100-105 mph began east-southeast of Winthrop and tracked into Delaware County to just east-southeast of Masonville. A barn was completely destroyed at the beginning of its 4.3 mile long path. Additional damage to outbuildings and numerous trees was …
Blizzard Blizzard
A trained spotter reported 3.5 inches of snow. The AWOS at KMXO reported several hours with visibility below a quarter of a mile in snow and blowing snow. Wind gusts ranged 45 to 55 MPH.
Winter Storm Winter Storm
The COOP Observer in Manchester reported 12.6 inches of snow. A trained spotter snowfall reported 12.5 inches 3 miles north of Hopkinton.
Thunderstorm Wind Thunderstorm Wind
Broadcast media relayed photos of tree damage around Lake Delhi.
Thunderstorm Wind Thunderstorm Wind
Broadcast Media relayed a report of a large tree uprooted in Manchester, which fell on a fence. The time and location of the event were estimated using radar.
Thunderstorm Wind Thunderstorm Wind
The Emergency Manager reported that trees and power lines are down.
Thunderstorm Wind Thunderstorm Wind
Photos and video relayed on X of a large tree uprooted at a farmstead along with a blown down shed. The time of the event was estimated using radar.
Tornado EF0 Tornado
A brief EF-0 tornado with a 1.6 mile long track was identified from satellite data as well as pictures from Delaware County EMA. The wall of a farm outbuilding was destroyed along with some tree damage. The path continued through some crops to the southeast before the tornado lif…
Hail Hail
A trained spotter reported that hail ranged in size from half an inch to a quarter of an inch.
Hail Hail
Thunderstorm Wind Thunderstorm Wind
Large lighting pole was downed at baseball field at fairgrounds.
Thunderstorm Wind Thunderstorm Wind
Large tree in roadway at 245th St and 260th Ave east of Delhi. Done by storm outflow winds well ahead of the storms themselves. Time estimated by outflow signature on radar.
Thunderstorm Wind Thunderstorm Wind
Large branches down in town. Time estimated using radar.
Thunderstorm Wind Thunderstorm Wind
Measured by wind equipement.
Winter Storm Winter Storm
Trained spotters reported 5 to 6 inches of snow, with widespread snow covered roads.
Ice Storm Ice Storm
Trained spotters and DOT reported widespread slick conditions with a 0.2 to 0.4 of an inch of ice accumulation on the ground and elevated surfaces.
Thunderstorm Wind Thunderstorm Wind
The Emergency Manager reported a 10 inch tree limbs down.
Thunderstorm Wind Thunderstorm Wind
A trained spotter reported that a pine tree was snapped by thunderstorm winds at Backbone State Park.
Thunderstorm Wind Thunderstorm Wind
Spotter estimated wind gust.
Thunderstorm Wind Thunderstorm Wind
A public report of an estimated 60 MPH thunderstorm wind gust. There was a fence blown down with tree limbs knocked down.
Winter Weather Winter Weather
A snowfall report of 1.8 inches by the COOP Observer in Manchester.
Winter Storm Winter Storm
Numerous reports of 4 to 8 inches of snow were received, with widespread significant drifting snow continuing into the evening hours.
Winter Storm Winter Storm
Snowfall reports ranged from 9.3 inches from a COOP Observer in Manchester to a public report of 10.5 inches 2 miles south of Buck Creek.
Thunderstorm Wind Thunderstorm Wind
A trained spotter reported a 70 mph wind gust with the thunderstorm.
Thunderstorm Wind Thunderstorm Wind
Emergency manager reported a 61 mph wind gust.
Thunderstorm Wind Thunderstorm Wind
House damage and roof blown off of a shed in Ryan.
Hail Hail
Hail Hail
Events by year, as a table
| Year | Events | Tornadoes |
|---|---|---|
| 2026 | 15 | 1 |
| 2025 | 13 | 1 |
| 2024 | 8 | 0 |
| 2023 | 8 | 2 |
| 2022 | 12 | 0 |
| 2021 | 17 | 3 |
| 2020 | 9 | 0 |
| 2019 | 16 | 1 |
| 2018 | 10 | 0 |
| 2017 | 17 | 1 |
| 2016 | 15 | 2 |
| 2015 | 12 | 0 |
| 2014 | 19 | 2 |
| 2013 | 33 | 0 |
| 2012 | 18 | 0 |
| 2011 | 8 | 0 |
| 2010 | 27 | 0 |
| 2009 | 40 | 1 |
| 2008 | 75 | 2 |
| 2007 | 35 | 1 |
| 2006 | 12 | 0 |
| 2005 | 16 | 0 |
| 2004 | 20 | 1 |
| 2003 | 10 | 0 |
| 2002 | 10 | 0 |
| 2001 | 20 | 2 |
| 2000 | 37 | 0 |
| 1999 | 14 | 0 |
| 1998 | 19 | 0 |
| 1997 | 17 | 0 |
| 1996 | 10 | 0 |
| 1995 | 3 | 0 |
| 1994 | 6 | 0 |
| 1992 | 4 | 0 |
| 1991 | 13 | 5 |
| 1990 | 5 | 2 |
| 1989 | 7 | 0 |
| 1988 | 4 | 3 |
| 1987 | 2 | 0 |
| 1986 | 2 | 1 |
| 1985 | 4 | 2 |
| 1984 | 6 | 0 |
| 1983 | 2 | 0 |
| 1981 | 1 | 0 |
| 1980 | 3 | 0 |
| 1979 | 2 | 0 |
| 1977 | 2 | 1 |
| 1976 | 1 | 0 |
| 1975 | 2 | 0 |
| 1974 | 5 | 1 |
| 1973 | 4 | 0 |
| 1972 | 2 | 0 |
| 1971 | 7 | 1 |
| 1970 | 1 | 0 |
| 1969 | 3 | 1 |
| 1968 | 1 | 0 |
| 1967 | 2 | 0 |
| 1966 | 2 | 1 |
| 1964 | 4 | 1 |
| 1962 | 1 | 0 |
| 1961 | 1 | 0 |
| 1960 | 1 | 1 |
| 1956 | 1 | 0 |
| 1955 | 1 | 0 |
Search your address
See every tornado that passed within 25 miles of a place in Delaware County, measured to its path.
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