Delaware County weather alerts
There are no active weather alerts for Delaware County, IA right now.
Since 2016 the National Weather Service has issued about 899 alerts that included Delaware County, roughly 90 a year. The most common is the severe thunderstorm warning (159 from 2016 to 2025). The last tornado warning was issued on August 11, 2026. 45 tornadoes have touched down in the county since 1950.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
No warnings, watches or advisories include Delaware County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Buchanan County, Jones County, Linn County, Dubuque County.
Delaware County alert history
Alert events that included Delaware County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 159 | 23 | October 13, 2026 |
| Winter Weather Advisory | 107 | 5 | March 16, 2026 |
| Dense Fog Advisory | 96 | 6 | September 17, 2026 |
| Wind Advisory | 73 | 2 | March 12, 2026 |
| Severe Thunderstorm Watch | 59 | 12 | August 18, 2026 |
| Cold Weather Advisory | 50 | 3 | January 26, 2026 |
| Flood Watch | 42 | 8 | September 30, 2026 |
| Heat Advisory | 36 | 1 | August 31, 2026 |
| Tornado Warning | 35 | 8 | August 11, 2026 |
| Freeze Warning | 30 | 2 | October 17, 2026 |
| Winter Storm Watch | 28 | 1 | March 16, 2026 |
| Winter Storm Warning | 28 | 1 | February 20, 2026 |
| Frost Advisory | 26 | 3 | May 11, 2026 |
| Tornado Watch | 23 | 7 | July 20, 2026 |
| Flash Flood Warning | 21 | 4 | September 20, 2026 |
| Red Flag Warning | 15 | 2 | March 28, 2026 |
| Flood Warning | 13 | 0 | July 3, 2024 |
| Extreme Cold Warning | 12 | 1 | January 23, 2026 |
| Freeze Watch | 9 | 1 | October 17, 2026 |
| Extreme Heat Watch | 7 | 2 | July 27, 2026 |
| High Wind Warning | 7 | 2 | March 15, 2026 |
| Extreme Heat Warning | 6 | 2 | July 26, 2026 |
| High Wind Watch | 4 | 2 | March 15, 2026 |
| Extreme Cold Watch | 4 | 1 | January 23, 2026 |
| Fire Weather Watch | 3 | 1 | February 18, 2026 |
| Snow Squall Warning | 2 | 0 | December 9, 2019 |
| Blizzard Warning | 2 | 2 | March 15, 2026 |
| Ice Storm Warning | 2 | 0 | December 14, 2024 |
Tornado history in Delaware County
45 tornadoes have been recorded in Delaware County since 1950, injuring 26 people. That ranks 23 of 99 counties in Iowa. The most recent was on July 11, 2025 (rated EF0).
Strongest tornadoes in Delaware County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| April 30, 1954 | F4 | Linn County | 80.4 mi | 200 yd | 0 | 0 |
| March 13, 1990 | F4 | Linn County | 19 mi | 200 yd | 0 | 0 |
| August 12, 1974 | F4 | Delaware County | 5 mi | 400 yd | 0 | 12 |
| May 25, 2008 | EF3 | Buchanan County | 32 mi | 1,232 yd | 0 | 3 |
| July 27, 1995 | F3 | Buchanan County | 20 mi | 150 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| July 11, 2025 | EF0 | Delaware County | 1.7 mi | 40 yd | 0 | 0 |
| March 31, 2023 | EF1 | Delaware County | 11.1 mi | 90 yd | 0 | 0 |
| March 31, 2023 | EF1 | Delaware County | 4.1 mi | 50 yd | 0 | 0 |
| July 14, 2021 | ? | Delaware County | 0.4 mi | 10 yd | 0 | 0 |
| July 14, 2021 | EF1 | Delaware County | 1.1 mi | 30 yd | 0 | 0 |
About Delaware County
- Population: 17,609 (2024 estimate)
- State: Iowa
- NOAA Weather Radio SAME code: 019055 (how to use it)