Alert archive / New Jersey / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in New Jersey, 2010
116 severe thunderstorm warnings in 2010. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in 2010. Tap one for its archive.
- Severe Thunderstorm Warnings
- 116
- Busiest month
- July23 severe thunderstorm warnings
- Busiest day
- July 25, 20109 severe thunderstorm warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
72 of 116 severe thunderstorm warnings covering New Jersey in 2010 had a qualifying storm report inside them; 106 of 142 hail, wind and damage reports fell inside a warning, on average 28 minutes after it went out.
New Jersey, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 116 | 72 | 38% | 142 | 75% | 28 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 183 | 107 | 42% | 252 | 82% | 29 min |
| NWS New York, NY: severe thunderstorm warnings | 101 | 66 | 35% | 244 | 64% | 22 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 | Counties | Lasted |
|---|---|---|---|---|
| Jan 25, 9:42 AM EST | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester, Salem | 63 min |
| Jan 25, 11:16 AM EST | Severe Thunderstorm Warning | PHI | Atlantic, Cape May, Cumberland | 50 min |
| Jan 25, 11:46 AM EST | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Cape May, Monmouth, Ocean | 59 min |
| Apr 8, 9:25 PM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 37 min |
| Apr 8, 9:56 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester | 28 min |
| Apr 8, 11:20 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Passaic | 40 min |
| Apr 22, 7:39 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Ocean | 36 min |
| May 3, 12:16 AM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Morris, Somerset, Warren | 34 min |
| May 4, 4:04 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Somerset | 56 min |
| May 14, 5:53 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Somerset, Warren | 67 min |
| May 14, 6:25 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Hunterdon, Mercer | 65 min |
| May 14, 7:04 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Monmouth, Ocean | 56 min |
| May 14, 7:19 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester | 56 min |
| May 14, 7:27 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Salem | 63 min |
| May 14, 7:48 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 57 min |
| May 14, 8:15 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Ocean | 46 min |
| May 14, 8:29 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cumberland, Gloucester, Salem | 61 min |
| May 14, 8:36 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Ocean | 40 min |
| May 14, 9:47 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland | 30 min |
| May 14, 9:57 PM EDT | Severe Thunderstorm Warning | PHI | Salem | 48 min |
| May 14, 10:09 PM EDT | Severe Thunderstorm Warning | PHI | Cape May | 37 min |
| May 14, 10:30 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic | 35 min |
| May 14, 10:41 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester | 49 min |
| May 27, 2:00 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 60 min |
| May 27, 3:19 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 41 min |
| May 27, 5:36 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex, Warren | 54 min |
| May 27, 8:38 PM EDT | Severe Thunderstorm Warning | PHI | Salem | 37 min |
| Jun 1, 1:17 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Monmouth, Ocean | 58 min |
| Jun 1, 2:05 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 25 min |
| Jun 6, 12:55 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 65 min |
| Jun 6, 1:25 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex, Warren | 65 min |
| Jun 6, 3:31 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset | 34 min |
| Jun 22, 5:41 PM EDT | Severe Thunderstorm Warning | PHI | Salem | 49 min |
| Jun 22, 6:29 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Salem | 46 min |
| Jun 22, 7:15 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Salem | 45 min |
| Jun 22, 8:26 PM EDT | Severe Thunderstorm Warning | PHI | Cape May, Cumberland | 49 min |
| Jun 22, 11:00 PM EDT | Severe Thunderstorm Warning | PHI | Cape May, Cumberland | 35 min |
| Jun 24, 1:47 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Passaic | 28 min |
| Jun 24, 2:12 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Hudson, Passaic, Union | 33 min |
| Jun 24, 3:13 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester, Salem | 62 min |
| Jun 24, 3:44 PM EDT | Severe Thunderstorm Warning | PHI | Salem | 76 min |
| Jun 24, 3:47 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more | 58 min |
| Jun 24, 4:18 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Cumberland, Gloucester, Salem | 57 min |
| Jun 24, 4:43 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more | 62 min |
| Jun 24, 5:46 PM EDT | Severe Thunderstorm Warning | PHI | Cape May, Cumberland | 59 min |
| Jun 28, 4:46 PM EDT | Severe Thunderstorm Warning | PHI | Cape May, Cumberland | 59 min |
| Jun 28, 5:05 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 55 min |
| Jul 19, 8:11 AM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Passaic | 34 min |
| Jul 19, 9:07 AM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester | 53 min |
| Jul 19, 10:40 AM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 21 min |
| Jul 19, 4:58 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 28 min |
| Jul 19, 6:03 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Passaic | 57 min |
| Jul 19, 6:22 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester, Salem | 53 min |
| Jul 21, 6:29 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth, Somerset | 45 min |
| Jul 21, 8:12 PM EDT | Severe Thunderstorm Warning | OKX | Bergen | 33 min |
| Jul 23, 6:49 PM EDT | Severe Thunderstorm Warning | OKX | Passaic | 56 min |
| Jul 23, 6:53 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex | 52 min |
| Jul 23, 7:24 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Passaic | 51 min |
| Jul 23, 8:44 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Hudson | 46 min |
| Jul 25, 1:48 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 42 min |
| Jul 25, 1:59 PM EDT | Severe Thunderstorm Warning | PHI | Morris | 61 min |
| Jul 25, 2:25 PM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 80 min |
| Jul 25, 2:41 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Somerset, Warren | 64 min |
| Jul 25, 2:46 PM EDT | Severe Thunderstorm Warning | OKX | Bergen | 34 min |
| Jul 25, 3:10 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more | 80 min |
| Jul 25, 3:18 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Gloucester | 57 min |
| Jul 25, 3:27 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem | 93 min |
| Jul 25, 3:40 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester, Ocean | 79 min |
| Jul 29, 11:43 AM EDT | Severe Thunderstorm Warning | PHI | Ocean | 32 min |
| Jul 29, 2:35 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 55 min |
| Aug 16, 3:12 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon | 27 min |
| Aug 16, 4:31 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Monmouth, Somerset | 59 min |
| Aug 16, 5:28 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 48 min |
| Aug 16, 5:55 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Passaic | 38 min |
| Aug 16, 5:57 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Hudson, Union | 38 min |
| Aug 22, 3:25 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden | 65 min |
| Aug 22, 4:25 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester | 65 min |
| Sep 13, 3:50 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 55 min |
| Sep 13, 4:44 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex | 61 min |
| Sep 13, 4:59 PM EDT | Severe Thunderstorm Warning | OKX | Essex, Passaic, Union | 46 min |
| Sep 13, 5:10 PM EDT | Severe Thunderstorm Warning | PHI | Warren | 50 min |
| Sep 13, 7:40 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Monmouth, Ocean | 22 min |
| Sep 16, 4:36 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Gloucester, Salem | 54 min |
| Sep 16, 4:55 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Morris and 1 more | 80 min |
| Sep 16, 5:14 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem | 61 min |
| Sep 16, 5:41 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Monmouth, Ocean | 64 min |
| Sep 16, 6:18 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cumberland, Gloucester, Monmouth and 2 more | 42 min |
| Sep 16, 6:57 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Cape May, Cumberland, Ocean | 50 min |
| Sep 22, 6:18 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Sussex, Warren | 42 min |
| Sep 22, 6:58 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren | 41 min |
| Sep 22, 7:07 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 53 min |
| Sep 22, 7:54 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Monmouth, Somerset | 36 min |
| Sep 22, 7:58 PM EDT | Severe Thunderstorm Warning | OKX | Hudson, Union | 47 min |
| Sep 22, 8:17 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Hunterdon, Mercer, Monmouth | 28 min |
| Sep 22, 9:10 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Gloucester, Salem | 65 min |
| Sep 22, 9:37 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cumberland, Gloucester, Ocean and 1 more | 68 min |
| Oct 1, 3:29 AM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester, Mercer, Middlesex and 2 more | 61 min |
| Oct 11, 7:04 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Morris, Somerset | 56 min |
| Oct 11, 7:50 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Hudson, Passaic | 25 min |
| Oct 11, 7:52 PM EDT | Severe Thunderstorm Warning | PHI | Morris | 53 min |
| Oct 11, 8:09 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Hudson, Passaic, Union | 51 min |
| Oct 11, 8:26 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth, Morris, Somerset | 45 min |
| Oct 11, 10:04 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden | 56 min |
| Nov 17, 2:35 AM EST | Severe Thunderstorm Warning | PHI | Camden, Cumberland, Gloucester, Salem | 55 min |
| Nov 17, 2:40 AM EST | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 65 min |
| Nov 17, 3:13 AM EST | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Cape May, Cumberland, Mercer, Middlesex and 2 more | 62 min |
| Nov 17, 3:28 AM EST | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex and 1 more | 62 min |
| Nov 17, 3:39 AM EST | Severe Thunderstorm Warning | OKX | Passaic | 66 min |
| Nov 17, 3:44 AM EST | Severe Thunderstorm Warning | OKX | Bergen, Essex, Hudson, Passaic, Union | 61 min |
| Nov 17, 4:06 AM EST | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth, Ocean | 24 min |
| Nov 17, 4:43 AM EST | Severe Thunderstorm Warning | OKX | Bergen, Hudson, Passaic | 29 min |
| Dec 1, 11:35 AM EST | Severe Thunderstorm Warning | PHI | Cumberland, Gloucester, Salem | 40 min |
| Dec 1, 12:12 PM EST | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 9 more | 63 min |
| Dec 1, 12:47 PM EST | Severe Thunderstorm Warning | OKX | Bergen, Essex, Hudson, Passaic, Union | 58 min |
| Dec 1, 1:16 PM EST | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Mercer, Middlesex, Monmouth, Morris and 3 more | 44 min |
| Dec 1, 1:45 PM EST | Severe Thunderstorm Warning | OKX | Bergen, Essex, Hudson, Passaic, Union | 45 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Burlington County35
- Gloucester County26
- Salem County24
- Cumberland County24
- Ocean County24
- Camden County22
- Atlantic County21
- Monmouth County21
- Hunterdon County21
- Bergen County17
- Passaic County16
- Mercer County16
- Morris County16
- Somerset County16
- Middlesex County16
- Warren County14
- Cape May County13
- Sussex County12
- Essex County11
- Hudson County10
- Union County8
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20092011
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.