Alert archive / New Jersey / Union County

Weather alerts in Union County, New Jersey, 2025

127 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Union County and its neighbors

Each county as a circle sized by its count in 2025. Tap one for its archive.

Alerts
127
Warnings
28
Watches
19
Advisories
42
Busiest month
July36 alerts
Busiest day
June 19, 20257 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

Union County, 2025

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings14750%2391%20 min
Flash flood warnings550%2095%102 min

Each office's whole area, 2025

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS New York, NY: severe thunderstorm warnings503432%13884%24 min
NWS New York, NY: flash flood warnings262312%9496%94 min

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.

The alerts

Every alert, in the order issued. Times are local, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeLasted
Jan 8, 11:18 PM ESTWind AdvisoryOKX22 hr
Jan 17, 3:08 PM ESTWinter Storm WatchOKX24 hr
Jan 18, 2:57 PM ESTWinter Storm WarningOKX36 hr
Jan 18, 2:57 PM ESTWinter Weather AdvisoryOKX36 hr
Jan 29, 3:09 AM ESTWind AdvisoryOKX19 hr
Feb 4, 3:09 PM ESTWinter Weather AdvisoryOKX46 hr
Feb 6, 3:18 PM ESTWinter Storm WatchOKX24 hr
Feb 7, 3:14 PM ESTWinter Weather AdvisoryOKX37 hr
Feb 8, 6:24 PM ESTMesoscale DiscussionSPC4 hr
Feb 12, 1:30 PM ESTCoastal Flood AdvisoryOKX25 hr
Feb 15, 3:25 AM ESTHigh Wind WatchOKX25 hr
Feb 16, 3:59 AM ESTWind AdvisoryOKX38 hr
Mar 5, 7:54 PM ESTAreal Flood AdvisoryOKX81 min
Mar 6, 3:28 AM ESTWind AdvisoryOKX37 hr
Mar 30, 6:28 AM EDTCoastal Flood StatementOKX21 hr
Mar 31, 8:24 PM EDTAreal Flood AdvisoryOKX3 hr
Apr 6, 1:07 AM EDTAreal Flood AdvisoryOKX3 hr
Apr 8, 3:17 AM EDTFreeze WarningOKX30 hr
Apr 11, 2:54 PM EDTCoastal Flood StatementOKX23 hr
Apr 11, 2:54 PM EDTCoastal Flood StatementOKX21 hr
Apr 26, 6:12 PM EDTSpecial Weather StatementOKX33 min
May 3, 5:54 PM EDTSpecial Weather StatementOKX21 min
May 3, 9:43 PM EDTSpecial Weather StatementOKX47 min
May 6, 5:57 PM EDTMesoscale DiscussionSPC2 hr
May 14, 3:09 PM EDTAreal Flood AdvisoryOKX3 hr
May 16, 1:08 PM EDTAreal Flood AdvisoryOKX82 min
May 21, 4:36 PM EDTCoastal Flood StatementOKX26 hr
May 30, 1:35 PM EDTFlood WatchOKX21 hr
Jun 10, 10:42 AM EDTAreal Flood AdvisoryOKX93 min
Jun 12, 4:57 PM EDTMesoscale DiscussionSPC2 hr
Jun 19, 1:22 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 19, 2:39 PM EDTSevere Thunderstorm WarningOKX51 min
Jun 19, 3:14 PM EDTSevere Thunderstorm WarningOKX46 min
Jun 19, 3:43 PM EDTSpecial Weather StatementOKX47 min
Jun 19, 4:16 PM EDTSevere Thunderstorm WarningOKX44 min
Jun 19, 4:34 PM EDTMesoscale DiscussionSPC116 min
Jun 19, 6:39 PM EDTSevere Thunderstorm WarningOKX36 min
Jun 20, 2:10 PM EDTExtreme Heat WatchOKX47 hr
Jun 21, 2:24 AM EDTExtreme Heat WarningOKX4 days
Jun 22, 1:35 PM EDTHeat AdvisoryOKX3 days
Jun 26, 4:11 AM EDTCoastal Flood StatementOKX24 hr
Jun 26, 4:11 AM EDTCoastal Flood AdvisoryOKX23 hr
Jun 30, 5:05 PM EDTSpecial Weather StatementOKX40 min
Jul 1, 5:56 PM EDTMesoscale DiscussionSPC2 hr
Jul 3, 1:30 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 3, 3:57 PM EDTMesoscale DiscussionSPC2 hr
Jul 3, 5:47 PM EDTSevere Thunderstorm WarningOKX43 min
Jul 7, 1:39 PM EDTHeat AdvisoryOKX30 hr
Jul 7, 3:37 PM EDTAreal Flood AdvisoryOKX83 min
Jul 8, 2:08 AM EDTFlood WatchOKX22 hr
Jul 8, 12:34 PM EDTMesoscale DiscussionSPC116 min
Jul 8, 1:42 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 8, 6:46 PM EDTMesoscale DiscussionSPC119 min
Jul 14, 1:59 AM EDTFlood WatchOKX22 hr
Jul 14, 1:20 PM EDTMesoscale DiscussionSPC2 hr
Jul 14, 4:04 PM EDTAreal Flood AdvisoryOKX15 min
Jul 14, 4:13 PM EDTFlash Flood WarningOKX4 hr
Jul 14, 5:25 PM EDTFlash Flood Warning Considerable damage threatOKX4 hr
Jul 14, 5:30 PM EDTSpecial Weather StatementOKX45 min
Jul 14, 9:51 PM EDTAreal Flood WarningOKX2 hr
Jul 15, 2:14 PM EDTHeat AdvisoryOKX55 hr
Jul 20, 2:01 PM EDTMesoscale DiscussionSPC119 min
Jul 23, 2:16 PM EDTExtreme Heat WatchOKX12 hr
Jul 24, 1:47 AM EDTExtreme Heat WarningOKX40 hr
Jul 25, 1:05 PM EDTMesoscale DiscussionSPC85 min
Jul 25, 1:41 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 25, 3:07 PM EDTSpecial Weather StatementOKX38 min
Jul 25, 3:18 PM EDTSevere Thunderstorm WarningOKX42 min
Jul 25, 3:54 PM EDTSevere Thunderstorm WarningOKX51 min
Jul 25, 4:29 PM EDTMesoscale DiscussionSPC91 min
Jul 26, 2:23 PM EDTHeat AdvisoryOKX4 days
Jul 28, 2:40 PM EDTExtreme Heat WarningOKX53 hr
Jul 30, 2:40 PM EDTFlood WatchOKX30 hr
Jul 31, 11:29 AM EDTMesoscale DiscussionSPC3 hr
Jul 31, 1:15 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 31, 1:41 PM EDTAreal Flood AdvisoryOKX2 hr
Jul 31, 1:41 PM EDTSevere Thunderstorm WarningOKX49 min
Jul 31, 1:52 PM EDTFlash Flood WarningOKX2 hr
Jul 31, 2:34 PM EDTSevere Thunderstorm WarningOKX41 min
Aug 13, 12:42 PM EDTMesoscale DiscussionSPC2 hr
Aug 13, 6:21 PM EDTSpecial Weather StatementOKX39 min
Aug 13, 6:39 PM EDTSevere Thunderstorm WarningOKX36 min
Aug 13, 6:51 PM EDTAreal Flood AdvisoryOKX26 min
Aug 13, 7:17 PM EDTFlash Flood WarningOKX46 min
Aug 17, 5:34 PM EDTSpecial Weather StatementOKX26 min
Aug 17, 5:39 PM EDTSevere Thunderstorm WarningOKX51 min
Aug 17, 5:56 PM EDTAreal Flood AdvisoryOKX64 min
Aug 17, 6:14 PM EDTFlash Flood WarningOKX81 min
Aug 17, 6:23 PM EDTSpecial Weather StatementOKX52 min
Aug 17, 6:28 PM EDTMesoscale DiscussionSPC62 min
Aug 20, 3:53 PM EDTCoastal Flood AdvisoryOKX33 hr
Aug 20, 3:53 PM EDTCoastal Flood AdvisoryOKX58 hr
Sep 4, 6:50 PM EDTSpecial Weather StatementOKX55 min
Sep 6, 11:56 AM EDTMesoscale DiscussionSPC94 min
Sep 6, 1:13 PM EDTSevere Thunderstorm WatchSPC7 hr
Sep 6, 2:51 PM EDTSevere Thunderstorm WarningOKX39 min
Sep 6, 3:23 PM EDTSevere Thunderstorm WarningOKX52 min
Sep 10, 4:03 AM EDTCoastal Flood AdvisoryOKX11 hr
Sep 10, 3:07 PM EDTCoastal Flood AdvisoryOKX25 hr
Sep 25, 3:22 PM EDTMesoscale DiscussionSPC113 min
Oct 9, 2:30 PM EDTCoastal Flood WatchOKX50 hr
Oct 10, 3:45 PM EDTCoastal Flood WarningOKX3 days
Oct 11, 3:04 PM EDTWind AdvisoryOKX42 hr
Oct 13, 7:55 PM EDTCoastal Flood StatementOKX21 hr
Oct 20, 3:17 AM EDTSpecial Weather StatementOKX43 min
Oct 26, 2:22 PM EDTFrost AdvisoryOKX19 hr
Oct 29, 2:41 PM EDTCoastal Flood StatementOKX29 hr
Oct 29, 2:41 PM EDTCoastal Flood AdvisoryOKX30 hr
Oct 30, 2:45 PM EDTWind AdvisoryOKX33 hr
Oct 30, 3:05 PM EDTAreal Flood AdvisoryOKX115 min
Nov 4, 12:56 PM ESTHigh Wind WatchOKX24 hr
Nov 5, 2:44 AM ESTWind AdvisoryOKX26 hr
Nov 6, 1:10 AM ESTFrost AdvisoryOKX31 hr
Nov 9, 4:48 PM ESTFreeze WatchOKX9 hr
Nov 10, 1:23 AM ESTFreeze WarningOKX32 hr
Nov 16, 2:12 PM ESTWind AdvisoryOKX7 hr
Dec 12, 1:39 PM ESTWinter Weather AdvisoryOKX49 hr
Dec 17, 1:33 PM ESTWind AdvisoryOKX58 hr
Dec 18, 4:11 AM ESTCoastal Flood AdvisoryOKX33 hr
Dec 19, 3:18 PM ESTSevere Thunderstorm WarningOKX57 min
Dec 24, 1:07 PM ESTWinter Storm WatchOKX24 hr
Dec 25, 1:19 PM ESTWinter Storm WarningOKX41 hr
Dec 26, 4:41 PM ESTSpecial Weather StatementOKX34 min
Dec 26, 6:32 PM ESTSpecial Weather StatementOKX118 min
Dec 27, 1:08 PM ESTWinter Weather AdvisoryOKX37 hr
Dec 29, 6:43 AM ESTDense Fog AdvisoryOKX5 hr
Dec 29, 12:43 PM ESTWind AdvisoryOKX28 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordForecastThe radar archive20242026

Sources

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.