New Castle County weather alerts
There are no active weather alerts for New Castle County, DE right now.
Since 2016 the National Weather Service has issued about 1,628 alerts that included New Castle County, roughly 163 a year. The most common is the severe thunderstorm warning (334 from 2016 to 2025). The last tornado warning was issued on November 12, 2026. 28 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 New Castle County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Chester County, Kent County, Delaware County, Cecil County.
New Castle County alert history
Alert events that included New Castle County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 334 | 52 | November 12, 2026 |
| Flood Advisory | 245 | 0 | March 23, 2024 |
| Coastal Flood Advisory | 147 | 9 | October 21, 2026 |
| Flood Warning | 121 | 3 | October 12, 2026 |
| Flood Watch | 102 | 10 | September 13, 2026 |
| Severe Thunderstorm Watch | 100 | 20 | October 16, 2026 |
| Wind Advisory | 85 | 3 | September 23, 2026 |
| Flash Flood Warning | 82 | 17 | November 12, 2026 |
| Dense Fog Advisory | 66 | 7 | April 3, 2026 |
| Winter Weather Advisory | 62 | 2 | March 3, 2026 |
| Heat Advisory | 51 | 7 | September 3, 2026 |
| Frost Advisory | 36 | 3 | October 26, 2026 |
| Extreme Heat Warning | 22 | 2 | July 15, 2026 |
| Tornado Warning | 19 | 3 | November 12, 2026 |
| Freeze Warning | 17 | 4 | November 14, 2026 |
| Tornado Watch | 17 | 6 | November 12, 2026 |
| Extreme Heat Watch | 16 | 2 | July 15, 2026 |
| Coastal Flood Warning | 15 | 1 | September 23, 2026 |
| Winter Storm Watch | 15 | 2 | February 22, 2026 |
| Winter Storm Warning | 15 | 2 | February 22, 2026 |
| High Wind Warning | 12 | 1 | February 7, 2026 |
| Freeze Watch | 10 | 3 | April 21, 2026 |
| Red Flag Warning | 9 | 0 | March 1, 2025 |
| Fire Weather Watch | 7 | 0 | March 1, 2025 |
| High Wind Watch | 7 | 1 | February 7, 2026 |
| Cold Weather Advisory | 7 | 3 | February 8, 2026 |
| Snow Squall Warning | 4 | 4 | February 7, 2026 |
| Tropical Storm Warning | 3 | 0 | August 3, 2020 |
| Blizzard Warning | 1 | 1 | February 22, 2026 |
| Tropical Storm Watch | 1 | 0 | August 2, 2020 |
| Extreme Cold Watch | 0 | 1 | February 7, 2026 |
| Extreme Cold Warning | 0 | 1 | February 7, 2026 |
Tornado history in New Castle County
28 tornadoes have been recorded in New Castle County since 1950, injuring 38 people. That ranks 1 of 3 counties in Delaware. The most recent was on August 8, 2024 (rated EF1).
Strongest tornadoes in New Castle County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| April 28, 1961 | F3 | New Castle County | 0.3 mi | 30 yd | 0 | 0 |
| August 4, 2020 | EF2 | Kent County | 35.8 mi | 500 yd | 0 | 0 |
| September 27, 1993 | F2 | New Castle County | 10 mi | 100 yd | 0 | 0 |
| September 28, 2004 | F2 | New Castle County | 5 mi | 150 yd | 0 | 0 |
| September 5, 1979 | F2 | New Castle County | 2.5 mi | 200 yd | 0 | 5 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| August 8, 2024 | EF1 | New Castle County | 1.1 mi | 150 yd | 0 | 0 |
| July 9, 2023 | EF1 | New Castle County | 1.2 mi | 200 yd | 0 | 0 |
| August 7, 2020 | EF1 | New Castle County | 4.2 mi | 450 yd | 0 | 0 |
| August 4, 2020 | EF2 | Kent County | 35.8 mi | 500 yd | 0 | 0 |
| July 9, 2015 | EF0 | New Castle County | 0.5 mi | 75 yd | 0 | 0 |
About New Castle County
- Population: 588,093 (2024 estimate)
- State: Delaware
- NOAA Weather Radio SAME code: 010003 (how to use it)