Alert archive / New Jersey / Mercer County

Weather alerts in Mercer County, New Jersey, 2016

175 weather alerts in 2016, 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 2016. Tap one for its archive.

Alerts: 175
Warnings: 41
Watches: 25
Advisories: 44
Busiest month: July54 alerts
Busiest day: July 25, 20169 alerts

Over time

By month

Warning verification

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

Mercer County, 2016

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	22	16	27%	5	100%	15 min
Flash flood warnings	6	3	50%	3	100%	62 min

Each office's whole area, 2016

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Philadelphia/Mount Holly: tornado warnings	4	1	75%	2	50%	0 min
NWS Philadelphia/Mount Holly: severe thunderstorm warnings	192	98	49%	402	76%	21 min
NWS Philadelphia/Mount Holly: flash flood warnings	37	16	57%	28	96%	45 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.

Issued	Product	Office	Lasted
Jan 10, 4:49 AM EST	Areal Flood Advisory	PHI	5 hr
Jan 10, 2:53 PM EST	Special Weather Statement	PHI	37 min
Jan 10, 5:18 PM EST	Special Weather Statement	PHI	42 min
Jan 10, 5:58 PM EST	Special Weather Statement	PHI	47 min
Jan 12, 3:30 PM EST	Wind Advisory	PHI	12 hr
Jan 12, 7:06 PM EST	Special Weather Statement	PHI	84 min
Jan 20, 3:21 PM EST	Winter Storm Watch	PHI	37 hr
Jan 21, 10:37 AM EST	Blizzard Watch	PHI	18 hr
Jan 22, 4:16 AM EST	Blizzard Warning	PHI	44 hr
Jan 22, 5:36 PM EST	Special Weather Statement	PHI	3 hr
Jan 23, 12:08 AM EST	Mesoscale Discussion	SPC	5 hr
Jan 23, 4:20 AM EST	Mesoscale Discussion	SPC	5 hr
Jan 23, 8:51 AM EST	Mesoscale Discussion	SPC	4 hr
Jan 23, 11:07 AM EST	Special Weather Statement	PHI	83 min
Jan 23, 12:44 PM EST	Mesoscale Discussion	SPC	6 hr
Jan 23, 6:40 PM EST	Mesoscale Discussion	SPC	4 hr
Jan 26, 9:54 AM EST	Special Weather Statement	PHI	51 min
Feb 1, 3:32 PM EST	Flood Watch	PHI	60 hr
Feb 3, 4:43 PM EST	Areal Flood Advisory	PHI	8 hr
Feb 3, 9:41 PM EST	Dense Fog Advisory	PHI	9 hr
Feb 4, 3:27 PM EST	Winter Weather Advisory	PHI	21 hr
Feb 8, 1:59 PM EST	Coastal Flood Advisory	PHI	36 hr
Feb 8, 3:22 PM EST	Winter Weather Advisory	PHI	30 hr
Feb 11, 10:38 AM EST	Special Weather Statement	PHI	52 min
Feb 12, 2:19 PM EST	Wind Advisory	PHI	28 hr
Feb 12, 2:36 PM EST	Wind Chill Advisory	PHI	42 hr
Feb 14, 3:12 PM EST	Winter Weather Advisory	PHI	40 hr
Feb 15, 1:46 PM EST	Mesoscale Discussion	SPC	5 hr
Feb 15, 6:49 PM EST	Freezing Rain Advisory	PHI	10 hr
Feb 16, 12:09 PM EST	Special Weather Statement	PHI	51 min
Feb 16, 12:11 PM EST	Special Weather Statement	PHI	49 min
Feb 16, 12:29 PM EST	Severe Thunderstorm Warning	PHI	46 min
Feb 16, 1:04 PM EST	Special Weather Statement	PHI	116 min
Feb 16, 1:11 PM EST	Severe Thunderstorm Warning	PHI	94 min
Feb 16, 1:22 PM EST	Areal Flood Advisory	PHI	4 hr
Feb 24, 3:19 AM EST	Wind Advisory	PHI	22 hr
Feb 24, 3:20 PM EST	Tornado Watch	SPC	8 hr
Feb 24, 6:54 PM EST	Special Weather Statement	PHI	36 min
Feb 24, 7:10 PM EST	Flash Flood Warning	PHI	3 hr
Feb 24, 8:42 PM EST	Areal Flood Advisory	PHI	4 hr
Feb 24, 9:18 PM EST	Areal Flood Advisory	PHI	4 hr
Feb 24, 10:32 PM EST	Flash Flood Warning	PHI	4 hr
Feb 24, 10:39 PM EST	Mesoscale Discussion	SPC	66 min
Feb 24, 10:51 PM EST	Special Weather Statement	PHI	54 min
Feb 24, 11:03 PM EST	Severe Thunderstorm Warning	PHI	42 min
Feb 25, 2:22 AM EST	Areal Flood Warning	PHI	8 hr
Mar 3, 3:32 AM EST	Winter Weather Advisory	PHI	33 hr
Mar 17, 4:18 PM EDT	Special Weather Statement	PHI	57 min
Mar 28, 4:00 AM EDT	Wind Advisory	PHI	20 hr
Apr 1, 4:08 AM EDT	High Wind Watch	PHI	24 hr
Apr 1, 1:46 PM EDT	Mesoscale Discussion	SPC	119 min
Apr 1, 5:45 PM EDT	Severe Thunderstorm Warning	PHI	30 min
Apr 1, 7:40 PM EDT	Special Weather Statement	PHI	35 min
Apr 2, 3:58 AM EDT	High Wind Warning	PHI	32 hr
Apr 2, 9:45 PM EDT	Special Weather Statement	PHI	2 hr
Apr 2, 11:09 PM EDT	Severe Thunderstorm Warning	PHI	51 min
Apr 2, 11:56 PM EDT	Severe Thunderstorm Warning	PHI	34 min
Apr 3, 11:34 AM EDT	Wind Advisory	PHI	4 hr
Apr 3, 3:40 PM EDT	Freeze Watch	PHI	12 hr
Apr 4, 3:55 AM EDT	Freeze Warning	PHI	30 hr
Apr 4, 4:28 AM EDT	Freeze Watch	PHI	30 hr
Apr 5, 9:59 AM EDT	Freeze Warning	PHI	23 hr
Apr 8, 4:00 AM EDT	Freeze Watch	PHI	17 hr
Apr 8, 8:47 PM EDT	Freeze Warning	PHI	37 hr
Apr 8, 9:15 PM EDT	Winter Weather Advisory	PHI	22 hr
Apr 13, 6:30 PM EDT	Frost Advisory	PHI	13 hr
Apr 14, 3:07 PM EDT	Frost Advisory	PHI	17 hr
Apr 16, 3:29 PM EDT	Frost Advisory	PHI	17 hr
Apr 18, 2:00 PM EDT	Fire Weather Watch	PHI	13 hr
Apr 19, 3:00 AM EDT	Red Flag Warning	PHI	17 hr
Apr 20, 3:19 PM EDT	Fire Weather Watch	PHI	12 hr
Apr 21, 10:30 AM EDT	Red Flag Warning	PHI	5 hr
Apr 26, 2:45 AM EDT	Special Weather Statement	PHI	60 min
Apr 26, 1:19 PM EDT	Mesoscale Discussion	SPC	86 min
Apr 26, 1:54 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 26, 5:42 PM EDT	Special Weather Statement	PHI	33 min
Apr 26, 5:47 PM EDT	Severe Thunderstorm Warning	PHI	28 min
May 14, 3:06 AM EDT	Dense Fog Advisory	PHI	4 hr
May 23, 6:11 PM EDT	Special Weather Statement	PHI	79 min
May 23, 6:29 PM EDT	Special Weather Statement	PHI	31 min
May 29, 11:27 PM EDT	Areal Flood Advisory	PHI	8 hr
Jun 5, 3:12 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 5, 4:57 PM EDT	Mesoscale Discussion	SPC	93 min
Jun 5, 5:53 PM EDT	Severe Thunderstorm Warning	PHI	52 min
Jun 8, 11:33 AM EDT	Severe Thunderstorm Warning	PHI	42 min
Jun 8, 12:02 PM EDT	Severe Thunderstorm Warning	PHI	43 min
Jun 8, 12:04 PM EDT	Severe Thunderstorm Warning	PHI	56 min
Jun 11, 2:32 PM EDT	Mesoscale Discussion	SPC	58 min
Jun 21, 6:16 AM EDT	Special Weather Statement	PHI	59 min
Jun 21, 6:18 AM EDT	Severe Thunderstorm Warning	PHI	46 min
Jun 21, 7:09 PM EDT	Special Weather Statement	PHI	51 min
Jun 21, 7:20 PM EDT	Severe Thunderstorm Warning	PHI	40 min
Jun 21, 7:37 PM EDT	Areal Flood Advisory	PHI	4 hr
Jun 28, 4:09 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 28, 7:16 PM EDT	Mesoscale Discussion	SPC	59 min
Jul 1, 12:51 PM EDT	Mesoscale Discussion	SPC	114 min
Jul 1, 1:56 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 1, 2:03 PM EDT	Special Weather Statement	PHI	27 min
Jul 1, 2:19 PM EDT	Severe Thunderstorm Warning	PHI	41 min
Jul 4, 3:02 PM EDT	Flash Flood Watch	PHI	18 hr
Jul 5, 2:55 PM EDT	Excessive Heat Watch	PHI	13 hr
Jul 5, 2:55 PM EDT	Heat Advisory	PHI	13 hr
Jul 6, 3:40 AM EDT	Excessive Heat Warning	PHI	62 hr
Jul 7, 2:12 PM EDT	Special Weather Statement	PHI	63 min
Jul 8, 4:25 PM EDT	Areal Flood Advisory	PHI	4 hr
Jul 8, 5:12 PM EDT	Special Weather Statement	PHI	48 min
Jul 8, 5:18 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 8, 5:48 PM EDT	Areal Flood Advisory	PHI	4 hr
Jul 8, 5:54 PM EDT	Special Weather Statement	PHI	36 min
Jul 9, 9:00 PM EDT	Special Weather Statement	PHI	60 min
Jul 9, 9:48 PM EDT	Severe Thunderstorm Warning	PHI	27 min
Jul 9, 10:10 PM EDT	Severe Thunderstorm Warning	PHI	50 min
Jul 12, 2:45 PM EDT	Excessive Heat Watch	PHI	24 hr
Jul 13, 2:05 PM EDT	Areal Flood Advisory	PHI	4 hr
Jul 13, 2:44 PM EDT	Excessive Heat Warning	PHI	52 hr
Jul 16, 2:13 PM EDT	Special Weather Statement	PHI	32 min
Jul 16, 2:45 PM EDT	Special Weather Statement	PHI	30 min
Jul 16, 2:59 PM EDT	Special Weather Statement	PHI	46 min
Jul 16, 4:00 PM EDT	Special Weather Statement	PHI	30 min
Jul 18, 11:40 AM EDT	Mesoscale Discussion	SPC	95 min
Jul 18, 12:05 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 18, 3:21 PM EDT	Mesoscale Discussion	SPC	84 min
Jul 21, 3:34 AM EDT	Excessive Heat Watch	PHI	61 hr
Jul 22, 3:35 PM EDT	Excessive Heat Warning	PHI	3 days
Jul 25, 4:46 AM EDT	Special Weather Statement	PHI	59 min
Jul 25, 12:43 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 25, 3:03 PM EDT	Mesoscale Discussion	SPC	57 min
Jul 25, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	38 min
Jul 25, 4:52 PM EDT	Mesoscale Discussion	SPC	83 min
Jul 25, 5:15 PM EDT	Severe Thunderstorm Warning	PHI	45 min
Jul 25, 5:58 PM EDT	Severe Thunderstorm Warning	PHI	47 min
Jul 25, 6:17 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 25, 6:39 PM EDT	Severe Thunderstorm Warning	PHI	40 min
Jul 27, 3:53 PM EDT	Flash Flood Watch	PHI	42 hr
Jul 28, 1:27 PM EDT	Severe Thunderstorm Watch	SPC	11 hr
Jul 28, 4:10 PM EDT	Mesoscale Discussion	SPC	95 min
Jul 29, 7:56 AM EDT	Areal Flood Advisory	PHI	4 hr
Jul 30, 12:11 PM EDT	Mesoscale Discussion	SPC	64 min
Jul 30, 3:06 PM EDT	Areal Flood Advisory	PHI	4 hr
Jul 30, 3:34 PM EDT	Areal Flood Advisory	PHI	4 hr
Jul 30, 3:49 PM EDT	Special Weather Statement	PHI	26 min
Jul 30, 3:58 PM EDT	Flash Flood Warning	PHI	7 hr
Jul 30, 6:26 PM EDT	Flash Flood Warning Emergency	PHI	4 hr
Jul 30, 10:19 PM EDT	Areal Flood Warning	PHI	7 hr
Jul 31, 6:31 AM EDT	Areal Flood Advisory	PHI	44 min
Jul 31, 7:19 AM EDT	Areal Flood Advisory	PHI	3 hr
Jul 31, 7:22 AM EDT	Areal Flood Advisory	PHI	4 hr
Jul 31, 12:28 PM EDT	Flash Flood Watch	PHI	38 hr
Jul 31, 2:41 PM EDT	Special Weather Statement	PHI	49 min
Aug 6, 12:54 PM EDT	Mesoscale Discussion	SPC	3 hr
Aug 6, 5:40 PM EDT	Special Weather Statement	PHI	50 min
Aug 6, 6:52 PM EDT	Special Weather Statement	PHI	23 min
Aug 9, 3:04 PM EDT	Excessive Heat Watch	PHI	24 hr
Aug 10, 3:20 PM EDT	Excessive Heat Warning	PHI	6 days
Aug 11, 4:15 PM EDT	Severe Thunderstorm Warning	PHI	24 min
Aug 11, 4:57 PM EDT	Areal Flood Advisory	PHI	3 hr
Aug 14, 1:45 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 14, 8:17 PM EDT	Special Weather Statement	PHI	43 min
Aug 14, 9:12 PM EDT	Special Weather Statement	PHI	33 min
Aug 16, 3:20 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 16, 4:55 PM EDT	Mesoscale Discussion	SPC	95 min
Aug 17, 12:29 AM EDT	Special Weather Statement	PHI	46 min
Aug 17, 1:33 AM EDT	Special Weather Statement	PHI	42 min
Sep 7, 11:50 AM EDT	Heat Advisory	PHI	3 days
Oct 25, 3:54 AM EDT	Frost Advisory	PHI	29 hr
Oct 28, 9:51 PM EDT	Frost Advisory	PHI	11 hr
Oct 30, 5:48 PM EDT	Severe Thunderstorm Warning	PHI	42 min
Nov 19, 3:42 AM EST	Wind Advisory	PHI	63 hr
Nov 30, 3:14 AM EST	Dense Fog Advisory	PHI	8 hr
Nov 30, 9:46 PM EST	Special Weather Statement	PHI	29 min
Dec 10, 2:29 PM EST	Winter Weather Advisory	PHI	42 hr
Dec 16, 3:45 AM EST	Winter Weather Advisory	PHI	37 hr
Dec 17, 4:21 AM EST	Mesoscale Discussion	SPC	5 hr
Dec 17, 7:28 PM EST	Dense Fog Advisory	PHI	11 hr
Dec 18, 1:29 PM EST	Special Weather Statement	PHI	2 hr

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	22
Severe Thunderstorm Watch	8
Tornado Watch	1
Mesoscale Discussion	23
Special Weather Statement	42
Flooding
Areal Flood Warning	2
Flash Flood Warning	6
Flash Flood Watch	3
Flood Watch	1
Areal Flood Advisory	17
Winter
Blizzard Warning	1
Blizzard Watch	1
Winter Storm Watch	1
Freezing Rain Advisory	1
Winter Weather Advisory	7
Heat
Excessive Heat Warning	4
Excessive Heat Watch	4
Heat Advisory	2
Cold
Freeze Warning	3
Freeze Watch	3
Frost Advisory	5
Wind Chill Advisory	1
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	6
Fire
Red Flag Warning	2
Fire Weather Watch	2
Fog and smoke
Dense Fog Advisory	4
Coast and beach
Coastal Flood Advisory	1

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2015 2017

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.