Chester County weather alerts
There are no active weather alerts for Chester County, PA right now.
Since 2016 the National Weather Service has issued about 1,745 alerts that included Chester County, roughly 175 a year. The most common is the severe thunderstorm warning (401 from 2016 to 2025). The last tornado warning was issued on August 20, 2026. 31 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 Chester County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Lancaster County, New Castle County, Delaware County, Cecil County.
Chester County alert history
Alert events that included Chester County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 401 | 52 | November 12, 2026 |
| Flood Advisory | 260 | 0 | March 23, 2024 |
| Flood Warning | 190 | 4 | October 12, 2026 |
| Flash Flood Warning | 119 | 21 | September 3, 2026 |
| Severe Thunderstorm Watch | 115 | 18 | October 16, 2026 |
| Flood Watch | 106 | 9 | August 27, 2026 |
| Dense Fog Advisory | 78 | 7 | May 26, 2026 |
| Winter Weather Advisory | 77 | 3 | March 3, 2026 |
| Wind Advisory | 76 | 3 | September 25, 2026 |
| Heat Advisory | 57 | 8 | September 3, 2026 |
| Frost Advisory | 37 | 9 | November 2, 2026 |
| Freeze Warning | 31 | 6 | November 14, 2026 |
| Tornado Warning | 26 | 4 | August 20, 2026 |
| Winter Storm Warning | 21 | 2 | February 22, 2026 |
| Extreme Heat Warning | 19 | 1 | July 1, 2026 |
| Freeze Watch | 18 | 5 | October 24, 2026 |
| Tornado Watch | 18 | 6 | November 12, 2026 |
| Extreme Heat Watch | 17 | 1 | July 1, 2026 |
| Snow Squall Warning | 16 | 4 | February 7, 2026 |
| Winter Storm Watch | 15 | 2 | February 22, 2026 |
| Red Flag Warning | 12 | 0 | November 16, 2024 |
| Fire Weather Watch | 9 | 0 | November 16, 2024 |
| High Wind Warning | 9 | 0 | December 19, 2025 |
| High Wind Watch | 7 | 0 | February 16, 2025 |
| Cold Weather Advisory | 7 | 4 | February 8, 2026 |
| Blizzard Warning | 2 | 0 | March 14, 2017 |
| Tropical Storm Warning | 1 | 0 | August 3, 2020 |
| Ice Storm Warning | 1 | 0 | February 15, 2021 |
| Extreme Cold Watch | 0 | 1 | February 7, 2026 |
| Extreme Cold Warning | 0 | 1 | February 7, 2026 |
Tornado history in Chester County
31 tornadoes have been recorded in Chester County since 1950, killing 3 people and injuring 32. That ranks 5 of 67 counties in Pennsylvania. The most recent was on June 16, 2023 (rated EF1).
Strongest tornadoes in Chester County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| March 22, 1955 | F3 | Chester County | 9.6 mi | 600 yd | 1 | 0 |
| July 27, 1994 | F3 | Chester County | 4 mi | 100 yd | 0 | 11 |
| September 5, 1979 | F2 | Chester County | 4.1 mi | 63 yd | 1 | 4 |
| September 1, 2021 | EF2 | Chester County | 5.9 mi | 350 yd | 0 | 0 |
| July 17, 1992 | F2 | Chester County | 4 mi | 100 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 16, 2023 | EF1 | Chester County | 1.8 mi | 250 yd | 0 | 0 |
| September 1, 2021 | EF2 | Chester County | 5.9 mi | 350 yd | 0 | 0 |
| June 30, 2015 | EF1 | Chester County | 0.7 mi | 100 yd | 0 | 0 |
| September 27, 2010 | EF0 | Chester County | 1.4 mi | 100 yd | 0 | 0 |
| August 29, 2006 | F1 | Chester County | 2 mi | 150 yd | 0 | 0 |
About Chester County
- Population: 560,745 (2024 estimate)
- State: Pennsylvania
- NOAA Weather Radio SAME code: 042029 (how to use it)