Alert archive / New Jersey / Mercer County

Weather alerts in Mercer County, New Jersey, 2026

179 weather alerts in 2026, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Mercer County and its neighbors

Each county as a circle sized by its count in 2026. Tap one for its archive.

Alerts: 179
Warnings: 70
Watches: 36
Advisories: 25
Busiest month: July47 alerts
Busiest day: June 22, 202610 alerts

Over time

By month

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.

Issued	Product	Office	Lasted
Jan 1, 4:44 AM EST	Snow Squall Warning	PHI	46 min
Jan 1, 5:27 AM EST	Snow Squall Warning	PHI	63 min
Jan 7, 12:12 AM EST	Dense Fog Advisory	PHI	8 hr
Jan 17, 2:42 PM EST	Winter Weather Advisory	PHI	29 hr
Jan 17, 8:17 PM EST	Dense Fog Advisory	PHI	4 hr
Jan 19, 3:11 AM EST	Cold Weather Advisory	PHI	31 hr
Jan 22, 2:12 AM EST	Winter Storm Watch	PHI	34 hr
Jan 22, 12:59 PM EST	Cold Weather Advisory	PHI	47 hr
Jan 23, 12:38 PM EST	Winter Storm Warning	PHI	60 hr
Jan 25, 6:01 AM EST	Mesoscale Discussion	SPC	6 hr
Jan 25, 3:02 PM EST	Mesoscale Discussion	SPC	4 hr
Jan 26, 1:16 AM EST	Cold Weather Advisory	PHI	7 days
Feb 5, 12:15 PM EST	Extreme Cold Watch	PHI	13 hr
Feb 6, 1:34 AM EST	Extreme Cold Warning	PHI	3 days
Feb 6, 1:34 AM EST	Wind Advisory	PHI	48 hr
Feb 7, 4:48 AM EST	Special Weather Statement	PHI	42 min
Feb 8, 1:59 AM EST	Cold Weather Advisory	PHI	32 hr
Feb 17, 1:15 PM EST	Dense Fog Advisory	PHI	21 hr
Feb 20, 1:50 PM EST	Winter Storm Watch	PHI	24 hr
Feb 21, 3:27 AM EST	Blizzard Warning	PHI	58 hr
Feb 21, 3:27 AM EST	Winter Storm Warning	PHI	58 hr
Feb 22, 4:58 PM EST	Mesoscale Discussion	SPC	4 hr
Mar 2, 11:44 AM EST	Winter Weather Advisory	PHI	34 hr
Mar 3, 5:58 AM EST	Mesoscale Discussion	SPC	5 hr
Mar 3, 4:04 PM EST	Dense Fog Advisory	PHI	6 hr
Mar 8, 1:22 AM EST	Dense Fog Advisory	PHI	9 hr
Mar 9, 7:33 PM EDT	Dense Fog Advisory	PHI	10 hr
Mar 11, 6:47 PM EDT	Mesoscale Discussion	SPC	118 min
Mar 11, 7:03 PM EDT	Severe Thunderstorm Watch	SPC	3 hr
Mar 15, 12:47 PM EDT	Wind Advisory	PHI	37 hr
Mar 16, 11:30 AM EDT	Tornado Watch	SPC	6 hr
Mar 16, 3:14 PM EDT	Mesoscale Discussion	SPC	91 min
Mar 16, 10:55 PM EDT	Mesoscale Discussion	SPC	2 hr
Mar 16, 11:16 PM EDT	Severe Thunderstorm Warning	PHI	59 min
Mar 16, 11:19 PM EDT	Severe Thunderstorm Warning	PHI	41 min
Mar 16, 11:51 PM EDT	Severe Thunderstorm Warning	PHI	43 min
Mar 21, 3:25 AM EDT	Dense Fog Advisory	PHI	5 hr
Apr 6, 12:15 PM EDT	Freeze Watch	PHI	14 hr
Apr 7, 2:19 AM EDT	Freeze Watch	PHI	31 hr
Apr 7, 2:19 AM EDT	Freeze Warning	PHI	31 hr
Apr 8, 8:55 AM EDT	Freeze Warning	PHI	24 hr
Apr 18, 1:02 PM EDT	Freeze Watch	PHI	37 hr
Apr 20, 2:25 AM EDT	Freeze Warning	PHI	31 hr
Apr 26, 2:38 AM EDT	Frost Advisory	PHI	29 hr
May 10, 3:22 AM EDT	Dense Fog Advisory	PHI	7 hr
May 18, 2:52 AM EDT	Heat Advisory	PHI	64 hr
May 20, 1:52 PM EDT	Mesoscale Discussion	SPC	53 min
May 20, 2:10 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
May 20, 5:15 PM EDT	Severe Thunderstorm Warning	PHI	45 min
May 20, 5:29 PM EDT	Mesoscale Discussion	SPC	61 min
May 20, 5:41 PM EDT	Severe Thunderstorm Warning	PHI	49 min
May 20, 5:52 PM EDT	Severe Thunderstorm Warning	PHI	38 min
May 20, 6:23 PM EDT	Severe Thunderstorm Warning	PHI	56 min
Jun 6, 4:17 PM EDT	Mesoscale Discussion	SPC	118 min
Jun 6, 4:45 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 6, 6:17 PM EDT	Severe Thunderstorm Warning	PHI	58 min
Jun 6, 6:36 PM EDT	Mesoscale Discussion	SPC	114 min
Jun 6, 7:19 PM EDT	Severe Thunderstorm Warning	PHI	41 min
Jun 10, 2:24 AM EDT	Heat Advisory	PHI	66 hr
Jun 11, 3:02 PM EDT	Mesoscale Discussion	SPC	118 min
Jun 11, 6:09 PM EDT	Mesoscale Discussion	SPC	3 hr
Jun 11, 7:14 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 12, 1:48 PM EDT	Mesoscale Discussion	SPC	117 min
Jun 12, 3:04 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 12, 4:08 PM EDT	Severe Thunderstorm Warning	PHI	52 min
Jun 14, 6:22 PM EDT	Mesoscale Discussion	SPC	113 min
Jun 14, 7:06 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 14, 9:25 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 14, 10:44 PM EDT	Severe Thunderstorm Warning	PHI	46 min
Jun 14, 10:51 PM EDT	Flash Flood Warning	PHI	3 hr
Jun 14, 10:58 PM EDT	Severe Thunderstorm Warning	PHI	47 min
Jun 14, 11:42 PM EDT	Flash Flood Warning	PHI	117 min
Jun 22, 2:13 AM EDT	Flood Watch	PHI	25 hr
Jun 22, 1:25 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 22, 2:08 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 22, 2:55 PM EDT	Severe Thunderstorm Warning	PHI	50 min
Jun 22, 4:45 PM EDT	Mesoscale Discussion	SPC	90 min
Jun 22, 5:18 PM EDT	Severe Thunderstorm Warning	PHI	42 min
Jun 22, 5:53 PM EDT	Severe Thunderstorm Warning	PHI	52 min
Jun 22, 6:09 PM EDT	Severe Thunderstorm Warning	PHI	51 min
Jun 22, 6:36 PM EDT	Severe Thunderstorm Warning	PHI	39 min
Jun 22, 6:48 PM EDT	Flash Flood Warning	PHI	3 hr
Jun 28, 3:57 AM EDT	Extreme Heat Watch	PHI	71 hr
Jun 30, 2:44 AM EDT	Extreme Heat Warning	PHI	5 days
Jul 1, 6:40 PM EDT	Mesoscale Discussion	SPC	95 min
Jul 3, 3:25 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 3, 4:34 PM EDT	Mesoscale Discussion	SPC	116 min
Jul 3, 6:31 PM EDT	Mesoscale Discussion	SPC	119 min
Jul 3, 7:45 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	45 min
Jul 3, 8:03 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	57 min
Jul 3, 8:21 PM EDT	Severe Thunderstorm Warning	PHI	54 min
Jul 4, 3:28 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 4, 8:19 PM EDT	Mesoscale Discussion	SPC	116 min
Jul 4, 9:15 PM EDT	Severe Thunderstorm Warning	PHI	75 min
Jul 4, 10:52 PM EDT	Heat Advisory	PHI	21 hr
Jul 5, 2:33 AM EDT	Flood Watch	PHI	41 hr
Jul 5, 6:00 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 5, 7:30 PM EDT	Flash Flood Warning	PHI	2 hr
Jul 6, 9:16 AM EDT	Flash Flood Warning	PHI	2 hr
Jul 6, 10:38 AM EDT	Flash Flood Warning	PHI	4 hr
Jul 9, 2:09 AM EDT	Flood Watch	PHI	19 hr
Jul 9, 1:22 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 13, 2:08 AM EDT	Extreme Heat Watch	PHI	25 hr
Jul 14, 2:38 AM EDT	Extreme Heat Warning	PHI	41 hr
Jul 15, 3:55 PM EDT	Mesoscale Discussion	SPC	65 min
Jul 16, 12:10 AM EDT	Heat Advisory	PHI	20 hr
Jul 16, 3:59 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 17, 1:40 PM EDT	Flood Watch	PHI	33 hr
Jul 18, 12:50 PM EDT	Mesoscale Discussion	SPC	85 min
Jul 18, 1:52 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 18, 1:55 PM EDT	Tornado Watch	SPC	6 hr
Jul 18, 2:36 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 18, 3:13 PM EDT	Severe Thunderstorm Warning	PHI	47 min
Jul 18, 3:14 PM EDT	Flash Flood Warning Considerable damage threat	PHI	4 hr
Jul 18, 4:39 PM EDT	Mesoscale Discussion	SPC	96 min
Jul 18, 6:30 PM EDT	Severe Thunderstorm Warning	PHI	45 min
Jul 20, 2:44 PM EDT	Flood Watch	PHI	31 hr
Jul 21, 1:23 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 21, 2:06 PM EDT	Tornado Watch	SPC	7 hr
Jul 21, 3:40 PM EDT	Mesoscale Discussion	SPC	95 min
Jul 21, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	55 min
Jul 27, 2:11 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 27, 2:15 PM EDT	Flood Watch	PHI	38 hr
Jul 27, 4:21 PM EDT	Severe Thunderstorm Warning	PHI	39 min
Jul 27, 7:16 PM EDT	Mesoscale Discussion	SPC	119 min
Jul 28, 12:08 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 28, 12:51 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 28, 1:31 PM EDT	Severe Thunderstorm Warning	PHI	44 min
Jul 28, 2:11 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 28, 2:30 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 28, 6:51 PM EDT	Mesoscale Discussion	SPC	54 min
Aug 2, 2:20 PM EDT	Flood Watch	PHI	26 hr
Aug 3, 2:50 AM EDT	Flash Flood Warning	PHI	4 hr
Aug 3, 3:05 AM EDT	Severe Thunderstorm Warning	PHI	40 min
Aug 3, 3:28 AM EDT	Mesoscale Discussion	SPC	2 hr
Aug 3, 4:41 AM EDT	Flash Flood Warning	PHI	2 hr
Aug 3, 7:02 AM EDT	Areal Flood Warning	PHI	3 hr
Aug 3, 9:08 AM EDT	Flash Flood Warning	PHI	3 hr
Aug 3, 10:36 AM EDT	Flash Flood Warning	PHI	6 hr
Aug 3, 12:01 PM EDT	Areal Flood Warning	PHI	74 min
Aug 3, 1:20 PM EDT	Areal Flood Warning	PHI	4 hr
Aug 5, 1:23 PM EDT	Flash Flood Warning	PHI	4 hr
Aug 5, 1:50 PM EDT	Heat Advisory	PHI	3 days
Aug 5, 2:50 PM EDT	Flash Flood Warning Considerable damage threat	PHI	4 hr
Aug 7, 12:50 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 7, 1:22 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 7, 4:04 PM EDT	Mesoscale Discussion	SPC	116 min
Aug 7, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	55 min
Aug 7, 5:01 PM EDT	Severe Thunderstorm Warning	PHI	44 min
Aug 7, 5:34 PM EDT	Flash Flood Warning	PHI	3 hr
Aug 7, 5:40 PM EDT	Severe Thunderstorm Warning	PHI	50 min
Aug 7, 5:42 PM EDT	Flash Flood Warning	PHI	3 hr
Aug 10, 9:29 AM EDT	Mesoscale Discussion	SPC	91 min
Aug 10, 1:38 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 10, 2:10 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 10, 4:19 PM EDT	Mesoscale Discussion	SPC	116 min
Aug 11, 2:40 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 19, 2:08 PM EDT	Flood Watch	PHI	31 hr
Aug 20, 1:53 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 20, 2:31 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 20, 4:26 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 20, 6:13 PM EDT	Severe Thunderstorm Warning	PHI	47 min
Aug 20, 6:26 PM EDT	Flash Flood Warning	PHI	4 hr
Aug 26, 2:31 PM EDT	Flood Watch	PHI	35 hr
Aug 27, 10:57 AM EDT	Mesoscale Discussion	SPC	2 hr
Aug 27, 12:51 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Aug 27, 1:17 PM EDT	Flash Flood Warning	PHI	7 hr
Aug 27, 2:29 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 27, 8:09 PM EDT	Areal Flood Warning	PHI	5 hr
Sep 1, 2:30 AM EDT	Heat Advisory	PHI	18 hr
Sep 1, 3:13 PM EDT	Mesoscale Discussion	SPC	2 hr
Sep 1, 4:32 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 1, 6:32 PM EDT	Mesoscale Discussion	SPC	88 min
Sep 1, 8:08 PM EDT	Severe Thunderstorm Warning	PHI	52 min
Sep 1, 9:19 PM EDT	Flash Flood Warning	PHI	116 min
Sep 2, 3:53 AM EDT	Heat Advisory	PHI	40 hr
Sep 12, 2:21 AM EDT	Flood Watch	PHI	34 hr
Sep 13, 8:06 AM EDT	Flash Flood Warning	PHI	4 hr
Sep 22, 2:51 AM EDT	Wind Advisory	PHI	6 days

By product

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

Product	Alerts
Severe storms
Severe Thunderstorm Warning	32
Severe Thunderstorm Watch	15
Tornado Watch	3
Mesoscale Discussion	47
Special Weather Statement	1
Flooding
Areal Flood Warning	4
Flash Flood Warning	23
Flood Watch	10
Winter
Blizzard Warning	1
Snow Squall Warning	2
Winter Storm Warning	2
Winter Storm Watch	2
Winter Weather Advisory	2
Heat
Extreme Heat Warning	2
Extreme Heat Watch	2
Heat Advisory	7
Cold
Extreme Cold Warning	1
Freeze Warning	3
Extreme Cold Watch	1
Freeze Watch	3
Cold Weather Advisory	4
Frost Advisory	1
Wind and dust
Wind Advisory	3
Fog and smoke
Dense Fog Advisory	8

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2025

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.