Pennsylvania alerts

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.

Chester County forecastLive radar here

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.

Every watch, warning and advisory the National Weather Service has in force over Chester County, Pennsylvania 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.

ProductIssuedMost recent
Severe Thunderstorm Warning53Sep 2, 2026
Flash Flood Warning21Sep 3, 2026
Snow Squall Warning4Feb 7, 2026
Tornado Warning4Aug 20, 2026
Winter Storm Warning4Feb 22, 2026
Flood Warning3Sep 3, 2026
Freeze Warning3Apr 21, 2026
Extreme Cold Warning1Feb 7, 2026
Extreme Heat Warning1Jul 1, 2026
High Wind Warning1Dec 19, 2025
Severe Thunderstorm Watch17Sep 3, 2026
Flood Watch9Aug 27, 2026
Tornado Watch5Aug 20, 2026
Freeze Watch3Apr 21, 2026
Winter Storm Watch2Feb 22, 2026
Extreme Cold Watch1Feb 7, 2026
Extreme Heat Watch1Jul 1, 2026
Dense Fog Advisory11May 26, 2026
Heat Advisory8Sep 3, 2026
Frost Advisory7May 2, 2026
Wind Advisory7Mar 16, 2026
Winter Weather Advisory6Mar 3, 2026
Cold Weather Advisory4Feb 8, 2026

Warnings issued

  1. Flood Warning
  2. Flood Warning
  3. Flash Flood Warning
  4. Severe Thunderstorm Warning
  5. Flash Flood Warning
  6. Severe Thunderstorm Warning
  7. Severe Thunderstorm Warning
  8. Severe Thunderstorm Warning
  9. Severe Thunderstorm Warning
  10. Flash Flood Warning
  11. Flash Flood Warning
  12. Severe Thunderstorm Warning
  13. Flood Warning
  14. Flash Flood Warning
  15. Severe Thunderstorm Warning
  16. Flash Flood Warning
  17. Flash Flood Warning
  18. Severe Thunderstorm Warning
  19. Tornado Warning
  20. Severe Thunderstorm Warning
  21. Severe Thunderstorm Warning
  22. Severe Thunderstorm Warning
  23. Severe Thunderstorm Warning
  24. Flash Flood Warning
  25. Severe Thunderstorm Warning
  26. Severe Thunderstorm Warning
  27. Severe Thunderstorm Warning
  28. Severe Thunderstorm Warning
  29. Severe Thunderstorm Warning
  30. Flash Flood Warning
  31. Flash Flood Warning
  32. Flash Flood Warning
  33. Severe Thunderstorm Warning
  34. Severe Thunderstorm Warning
  35. Severe Thunderstorm Warning
  36. Tornado Warning
  37. Severe Thunderstorm Warning
  38. Severe Thunderstorm Warning
  39. Severe Thunderstorm Warning
  40. Severe Thunderstorm Warning
  41. Flash Flood Warning
  42. Flash Flood Warning
  43. Severe Thunderstorm Warning
  44. Severe Thunderstorm Warning
  45. Severe Thunderstorm Warning
  46. Severe Thunderstorm Warning
  47. Severe Thunderstorm Warning
  48. Flash Flood Warning
  49. Flash Flood Warning
  50. Flash Flood Warning
  51. Flash Flood Warning
  52. Flash Flood Warning
  53. Severe Thunderstorm Warning
  54. Severe Thunderstorm Warning
  55. Severe Thunderstorm Warning
  56. Severe Thunderstorm Warning
  57. Severe Thunderstorm Warning
  58. Severe Thunderstorm Warning
  59. Severe Thunderstorm Warning
  60. Extreme Heat Warning

And 35 earlier warnings.

Every alert, most recent first
  1. Severe Thunderstorm Watch
  2. Heat Advisory
  3. Flood Warning
  4. Flood Warning
  5. Flash Flood Warning
  6. Severe Thunderstorm Warning
  7. Flash Flood Warning
  8. Severe Thunderstorm Warning
  9. Severe Thunderstorm Warning
  10. Severe Thunderstorm Warning
  11. Severe Thunderstorm Warning
  12. Severe Thunderstorm Watch
  13. Heat Advisory
  14. Flash Flood Warning
  15. Flash Flood Warning
  16. Severe Thunderstorm Warning
  17. Flood Warning
  18. Flash Flood Warning
  19. Severe Thunderstorm Warning
  20. Severe Thunderstorm Watch
  21. Flood Watch
  22. Flash Flood Warning
  23. Flash Flood Warning
  24. Severe Thunderstorm Warning
  25. Tornado Warning
  26. Severe Thunderstorm Warning
  27. Severe Thunderstorm Warning
  28. Tornado Watch
  29. Severe Thunderstorm Watch
  30. Flood Watch
  31. Severe Thunderstorm Warning
  32. Severe Thunderstorm Warning
  33. Flash Flood Warning
  34. Severe Thunderstorm Warning
  35. Severe Thunderstorm Watch
  36. Severe Thunderstorm Warning
  37. Severe Thunderstorm Warning
  38. Severe Thunderstorm Watch
  39. Severe Thunderstorm Warning
  40. 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.