Delaware County weather alerts
There are no active weather alerts for Delaware County, PA right now.
Since 2016 the National Weather Service has issued about 1,539 alerts that included Delaware County, roughly 154 a year. The most common is the severe thunderstorm warning (303 from 2016 to 2025). The last tornado warning was issued on August 20, 2026. 6 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 Chester County, New Castle County, Philadelphia County, Montgomery 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 | 303 | 41 | November 12, 2026 |
| Flood Advisory | 217 | 0 | March 23, 2024 |
| Coastal Flood Advisory | 120 | 3 | September 24, 2026 |
| Flood Warning | 113 | 9 | October 12, 2026 |
| Flood Watch | 109 | 10 | September 13, 2026 |
| Severe Thunderstorm Watch | 109 | 17 | October 16, 2026 |
| Flash Flood Warning | 97 | 38 | November 12, 2026 |
| Wind Advisory | 76 | 3 | September 25, 2026 |
| Dense Fog Advisory | 64 | 7 | March 21, 2026 |
| Winter Weather Advisory | 63 | 2 | March 3, 2026 |
| Heat Advisory | 49 | 7 | September 3, 2026 |
| Frost Advisory | 29 | 2 | October 25, 2026 |
| Extreme Heat Warning | 23 | 2 | July 15, 2026 |
| Winter Storm Warning | 18 | 2 | February 22, 2026 |
| Tornado Watch | 17 | 6 | November 12, 2026 |
| Extreme Heat Watch | 16 | 2 | July 15, 2026 |
| Tornado Warning | 16 | 4 | August 20, 2026 |
| Winter Storm Watch | 14 | 2 | February 22, 2026 |
| Red Flag Warning | 13 | 0 | November 16, 2024 |
| Freeze Warning | 12 | 4 | November 14, 2026 |
| High Wind Warning | 11 | 0 | December 19, 2025 |
| Coastal Flood Warning | 10 | 0 | April 12, 2024 |
| Fire Weather Watch | 9 | 0 | November 16, 2024 |
| Freeze Watch | 7 | 3 | April 21, 2026 |
| High Wind Watch | 7 | 0 | February 16, 2025 |
| Cold Weather Advisory | 7 | 3 | February 8, 2026 |
| Snow Squall Warning | 7 | 3 | February 7, 2026 |
| Blizzard Warning | 1 | 1 | February 22, 2026 |
| Tropical Storm Watch | 1 | 0 | August 2, 2020 |
| Tropical Storm Warning | 1 | 0 | August 3, 2020 |
| Extreme Cold Watch | 0 | 1 | February 7, 2026 |
| Extreme Cold Warning | 0 | 1 | February 7, 2026 |
Tornado history in Delaware County
6 tornadoes have been recorded in Delaware County since 1950, injuring 2 people. That ranks 59 of 67 counties in Pennsylvania. The most recent was on October 31, 2019 (rated EF2).
Strongest tornadoes in Delaware County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 29, 1973 | F2 | Delaware County | 1.9 mi | 63 yd | 0 | 0 |
| October 31, 2019 | EF2 | Delaware County | 0.5 mi | 250 yd | 0 | 2 |
| September 27, 1993 | F1 | Delaware County | 3 mi | 200 yd | 0 | 0 |
| July 15, 1992 | F1 | Delaware County | 0.7 mi | 100 yd | 0 | 0 |
| April 16, 1994 | F1 | Delaware County | 0.3 mi | 33 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| October 31, 2019 | EF2 | Delaware County | 0.5 mi | 250 yd | 0 | 2 |
| August 22, 2010 | EF0 | Delaware County | 0.3 mi | 80 yd | 0 | 0 |
| April 16, 1994 | F1 | Delaware County | 0.3 mi | 33 yd | 0 | 0 |
| September 27, 1993 | F1 | Delaware County | 3 mi | 200 yd | 0 | 0 |
| July 15, 1992 | F1 | Delaware County | 0.7 mi | 100 yd | 0 | 0 |
About Delaware County
- Population: 584,882 (2024 estimate)
- State: Pennsylvania
- NOAA Weather Radio SAME code: 042045 (how to use it)