Flash Flood Warnings in New Jersey, 2024

By month

24 of 47 flash flood warnings covering New Jersey in 2024 had a flash flood report inside them; 70 of 81 flash flood reports fell inside a warning, on average 64 minutes after it went out.

New Jersey, 2024

Each office's whole area, 2024

An office's figures cover every county it serves, including across state lines.

Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.

• Burlington County14
• Warren County10
• Camden County8
• Bergen County7
• Hunterdon County6
• Middlesex County6
• Somerset County6
• Passaic County5
• Mercer County5
• Morris County5
• Monmouth County5
• Essex County4
• Hudson County4
• Union County4
• Gloucester County3
• Ocean County3
• Sussex County3
• Cape May County2
• Cumberland County2
• Atlantic County1
• Salem County1

1. August 6, 202413flash flood warnings
2. August 18, 202410flash flood warnings
3. June 30, 20244flash flood warnings
4. August 3, 20244flash flood warnings
5. August 7, 20244flash flood warnings
6. August 9, 20243flash flood warnings
7. June 14, 20242flash flood warnings
8. May 30, 20241flash flood warnings
9. June 22, 20241flash flood warnings
10. June 23, 20241flash flood warnings
11. July 7, 20241flash flood warnings
12. July 17, 20241flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive20232025

National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.