New Jersey alerts

Mercer County, New Jersey weather alerts

1 National Weather Service alert is in force for Mercer County: a wind advisory.

Checked Sat, Sep 26, 2026, 5:15 AM EDT. Times are Eastern Daylight Time.

Mercer County forecastLive radar here

Warnings on the map

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

Every watch, warning and advisory the National Weather Service has in force over Mercer County, New Jersey Open the live map with warnings and watches

Map layer from NOAA National Weather Service. Boundaries from the Iowa Environmental Mesonet.

Alerts in force1

Every product in force for Mercer County, worst first, with its full text.

Wind Advisory

Moderate

Wind Advisory issued September 26 at 4:08AM EDT until September 27 at 6:00AM EDT by NWS Mount Holly NJ

Issued Until 24 hr 44 min left

Areas New Castle, DE; Kent, DE; Somerset, NJ; Middlesex, NJ; Mercer, NJ; Salem, NJ; Gloucester, NJ; Camden, NJ; Northwestern Burlington, NJ; Cumberland, NJ; Delaware, PA; Philadelphia, PA; Eastern Montgomery, PA; Lower Bucks, PA

Full text

* WHAT...North winds 15 to 25 mph with gusts up to 45 mph. * WHERE...Portions of central and northern Delaware, central, northern, and southern New Jersey, and southeast Pennsylvania. * WHEN...Until 6 AM EDT Sunday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

What to do

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects.

NWS Mount Holly NJShare this alert

The past year in Mercer County

In the past year the National Weather Service issued 151 alerts for Mercer County, including 34 severe thunderstorm warnings, 23 flash flood warnings, 4 flood warnings and 3 freeze warnings.

ProductIssuedMost recent
Severe Thunderstorm Warning34Sep 1, 2026
Flash Flood Warning23Sep 13, 2026
Flood Warning4Aug 27, 2026
Freeze Warning3Apr 21, 2026
Winter Storm Warning3Feb 22, 2026
Extreme Heat Warning2Jul 15, 2026
Snow Squall Warning2Jan 1, 2026
Blizzard Warning1Feb 22, 2026
Extreme Cold Warning1Feb 7, 2026
High Wind Warning1Dec 19, 2025
Severe Thunderstorm Watch15Sep 1, 2026
Flood Watch10Sep 13, 2026
Freeze Watch3Apr 21, 2026
Tornado Watch3Jul 21, 2026
Winter Storm Watch3Feb 22, 2026
Extreme Heat Watch2Jul 15, 2026
Extreme Cold Watch1Feb 7, 2026
Dense Fog Advisory10May 10, 2026
Wind Advisory8Sep 25, 2026
Frost Advisory7Apr 27, 2026
Heat Advisory7Sep 3, 2026
Cold Weather Advisory4Feb 8, 2026
Winter Weather Advisory4Mar 3, 2026

Warnings issued

  1. Flash Flood Warning
  2. Flash Flood Warning
  3. Severe Thunderstorm Warning
  4. Flood Warning
  5. Flash Flood Warning
  6. Flash Flood Warning
  7. Severe Thunderstorm Warning
  8. Flash Flood Warning
  9. Severe Thunderstorm Warning
  10. Flash Flood Warning
  11. Severe Thunderstorm Warning
  12. Severe Thunderstorm Warning
  13. Flash Flood Warning
  14. Flash Flood Warning
  15. Flood Warning
  16. Flood Warning
  17. Flash Flood Warning
  18. Flash Flood Warning
  19. Flood Warning
  20. Flash Flood Warning
  21. Severe Thunderstorm Warning
  22. Flash Flood Warning
  23. Flash Flood Warning
  24. Severe Thunderstorm Warning
  25. Severe Thunderstorm Warning
  26. Severe Thunderstorm Warning
  27. Severe Thunderstorm Warning
  28. Flash Flood Warning
  29. Severe Thunderstorm Warning
  30. Flash Flood Warning
  31. Flash Flood Warning
  32. Extreme Heat Warning
  33. Flash Flood Warning
  34. Flash Flood Warning
  35. Flash Flood Warning
  36. Flash Flood Warning
  37. Severe Thunderstorm Warning
  38. Severe Thunderstorm Warning
  39. Severe Thunderstorm Warning
  40. Severe Thunderstorm Warning
  41. Extreme Heat 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. Severe Thunderstorm Warning
  50. Flash Flood Warning
  51. Severe Thunderstorm Warning
  52. Severe Thunderstorm 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. Freeze Warning
  60. Freeze Warning

And 14 earlier warnings.

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

The 40 most recent of 151.

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 links to the alert's own page, with its text, map, radar and sounding.

Every alert in Mercer County since 1986

Nearby

The counties around Mercer 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.

Follow these alerts

Alerts for Mercer County in your reader or calendar.

The alerts on this page as a feed, updated every minute, for a feed reader or an app that reads Atom or RSS, and as a calendar where each alert runs from when it takes effect to when it ends. A feed or a calendar is not a warning siren: for warnings, keep a weather radio or your phone's emergency alerts on.

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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.