Delaware alerts

New Castle County, Delaware weather alerts

No watches, warnings or advisories are in force for New Castle County.

Checked Sun, Sep 20, 2026, 12:23 PM EDT. Times are Eastern Daylight Time.

New Castle County forecastLive radar here

Warnings on the map

Every watch, warning and advisory the National Weather Service has in force over New Castle County, Delaware. Open it for the live map, where it pans and zooms.

Every watch, warning and advisory the National Weather Service has in force over New Castle County, Delaware 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 New Castle 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 New Castle County

In the past year the National Weather Service issued 173 alerts for New Castle County, including 50 severe thunderstorm warnings, 16 flash flood warnings, 4 freeze warnings and 4 snow squall warnings.

ProductIssuedMost recent
Severe Thunderstorm Warning50Sep 2, 2026
Flash Flood Warning16Sep 3, 2026
Freeze Warning4Apr 21, 2026
Snow Squall Warning4Feb 7, 2026
Extreme Heat Warning2Jul 15, 2026
Flood Warning2Sep 3, 2026
High Wind Warning2Feb 7, 2026
Tornado Warning2Jul 28, 2026
Winter Storm Warning2Feb 22, 2026
Blizzard Warning1Feb 22, 2026
Coastal Flood Warning1Oct 12, 2025
Extreme Cold Warning1Feb 7, 2026
Severe Thunderstorm Watch19Sep 3, 2026
Flood Watch10Sep 13, 2026
Tornado Watch5Aug 20, 2026
Freeze Watch3Apr 21, 2026
Extreme Heat Watch2Jul 15, 2026
Winter Storm Watch2Feb 22, 2026
Coastal Flood Watch1Oct 12, 2025
Extreme Cold Watch1Feb 7, 2026
High Wind Watch1Feb 7, 2026
Coastal Flood Advisory9Aug 12, 2026
Dense Fog Advisory7Apr 3, 2026
Heat Advisory7Sep 3, 2026
Wind Advisory7Mar 16, 2026
Frost Advisory5Nov 7, 2025
Winter Weather Advisory4Mar 3, 2026
Cold Weather Advisory3Feb 8, 2026

Warnings issued

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

And 27 earlier warnings.

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

The 40 most recent of 173.

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 New Castle 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.