Chester County, Pennsylvania weather alerts
No watches, warnings or advisories are in force for Chester County.
Checked Sun, Sep 20, 2026, 3:46 PM EDT. Times are Eastern Daylight Time.
Warnings on the map
Every watch, warning and advisory the National Weather Service has in force over Chester County, Pennsylvania. Open it for the live map, where it pans and zooms.























Open the live map with warnings and watches
Map layer from NOAA National Weather Service. Boundaries from the Iowa Environmental Mesonet.
Alerts in force
Nothing is in force for Chester County right now. Its warnings come from the National Weather Service and appear here within a minute of being issued; every one of the past year is below.
The past year in Chester County
In the past year the National Weather Service issued 176 alerts for Chester County, including 53 severe thunderstorm warnings, 21 flash flood warnings, 4 snow squall warnings and 4 tornado warnings.
| Product | Issued | Most recent |
|---|---|---|
| Severe Thunderstorm Warning | 53 | Sep 2, 2026 |
| Flash Flood Warning | 21 | Sep 3, 2026 |
| Snow Squall Warning | 4 | Feb 7, 2026 |
| Tornado Warning | 4 | Aug 20, 2026 |
| Winter Storm Warning | 4 | Feb 22, 2026 |
| Flood Warning | 3 | Sep 3, 2026 |
| Freeze Warning | 3 | Apr 21, 2026 |
| Extreme Cold Warning | 1 | Feb 7, 2026 |
| Extreme Heat Warning | 1 | Jul 1, 2026 |
| High Wind Warning | 1 | Dec 19, 2025 |
| Severe Thunderstorm Watch | 17 | Sep 3, 2026 |
| Flood Watch | 9 | Aug 27, 2026 |
| Tornado Watch | 5 | Aug 20, 2026 |
| Freeze Watch | 3 | Apr 21, 2026 |
| Winter Storm Watch | 2 | Feb 22, 2026 |
| Extreme Cold Watch | 1 | Feb 7, 2026 |
| Extreme Heat Watch | 1 | Jul 1, 2026 |
| Dense Fog Advisory | 11 | May 26, 2026 |
| Heat Advisory | 8 | Sep 3, 2026 |
| Frost Advisory | 7 | May 2, 2026 |
| Wind Advisory | 7 | Mar 16, 2026 |
| Winter Weather Advisory | 6 | Mar 3, 2026 |
| Cold Weather Advisory | 4 | Feb 8, 2026 |
Warnings issued
- Flood Warning
- Flood Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Flash Flood Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Flood Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Flash Flood Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Tornado Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Flash Flood Warning
- Flash Flood Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Tornado Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Flash Flood Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Flash Flood Warning
- Flash Flood Warning
- Flash Flood Warning
- Flash Flood Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Extreme Heat Warning
And 35 earlier warnings.
Every alert, most recent first
- Severe Thunderstorm Watch
- Heat Advisory
- Flood Warning
- Flood Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Watch
- Heat Advisory
- Flash Flood Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Flood Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Watch
- Flood Watch
- Flash Flood Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Tornado Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Tornado Watch
- Severe Thunderstorm Watch
- Flood Watch
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Flash Flood Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Watch
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
- Severe Thunderstorm Watch
- Severe Thunderstorm Warning
- Severe Thunderstorm Warning
The 40 most recent of 176.
From the Iowa Environmental Mesonet’s archive of NWS watches, warnings and advisories (VTEC), by the county’s own code and the forecast zones inside it. Each date links to the event at the IEM.
Nearby
The counties around Chester County, with what is in force in each.
What this means
- Warning
- The hazard is happening or about to. Act now: a tornado warning means take shelter, a flash flood warning means move to higher ground.
- Watch
- Conditions favor the hazard. Nothing is happening yet; have a plan and be ready to act if a warning follows.
- Advisory
- A hazard that is less serious than a warning but can still cause trouble, such as dense fog, heat or light ice.
- Statement
- Information about weather that does not yet meet a warning: a strong storm, a hydrologic update, or a special weather statement.
Severity (extreme, severe, moderate, minor) is the rating the issuing office gives each product. More on the difference: tornado watch vs. tornado warning. Alerts come from the National Weather Service; follow its instructions and your local officials.
Sources
Alerts from the National Weather Service's public feed, read afresh every minute, and matched to counties and zones by their UGC codes. Warnings from outside the United States come from each country's own meteorological service. Follow the issuing office's instructions and your local officials.