Alert archive / New Jersey / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in New Jersey, 2013
87 severe thunderstorm warnings in 2013. 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 2013. Tap one for its archive.
- Severe Thunderstorm Warnings
- 87
- Busiest month
- June25 severe thunderstorm warnings
- Busiest day
- August 13, 20137 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.
50 of 87 severe thunderstorm warnings covering New Jersey in 2013 had a qualifying storm report inside them; 111 of 139 hail, wind and damage reports fell inside a warning, on average 19 minutes after it went out.
New Jersey, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 87 | 50 | 43% | 139 | 80% | 19 min |
Each office's whole area, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 127 | 69 | 46% | 212 | 73% | 24 min |
| NWS New York, NY: severe thunderstorm warnings | 62 | 42 | 32% | 130 | 83% | 19 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 31, 3:34 AM EST | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Morris, Somerset | 56 min |
| Apr 10, 5:35 PM EDT | Severe Thunderstorm Warning | PHI | Sussex, Warren | 55 min |
| Apr 10, 5:51 PM EDT | Severe Thunderstorm Warning | OKX | Passaic | 39 min |
| Apr 10, 6:56 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 49 min |
| May 11, 3:03 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Morris, Somerset | 42 min |
| May 11, 3:08 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Hudson, Passaic, Union | 52 min |
| May 11, 3:54 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester | 66 min |
| May 11, 4:00 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Hudson, Union | 45 min |
| Jun 2, 9:03 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Gloucester, Salem | 42 min |
| Jun 13, 9:18 AM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem | 57 min |
| Jun 13, 10:03 AM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more | 57 min |
| Jun 13, 10:50 AM EDT | Severe Thunderstorm Warning | PHI | Cape May | 55 min |
| Jun 13, 5:47 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cumberland, Gloucester, Salem | 58 min |
| Jun 13, 6:17 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Cape May, Cumberland, Ocean | 58 min |
| Jun 17, 2:45 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Somerset | 60 min |
| Jun 17, 4:06 PM EDT | Severe Thunderstorm Warning | PHI | Salem | 69 min |
| Jun 17, 6:38 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cape May, Cumberland, Salem | 67 min |
| Jun 18, 12:25 PM EDT | Severe Thunderstorm Warning | PHI | Mercer, Monmouth, Ocean | 50 min |
| Jun 18, 1:10 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 65 min |
| Jun 18, 1:39 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden | 81 min |
| Jun 24, 4:28 PM EDT | Severe Thunderstorm Warning | PHI | Ocean | 62 min |
| Jun 24, 5:18 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 42 min |
| Jun 24, 8:40 PM EDT | Severe Thunderstorm Warning | PHI | Burlington | 35 min |
| Jun 24, 9:04 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 56 min |
| Jun 25, 3:36 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset, Warren | 54 min |
| Jun 25, 4:49 PM EDT | Severe Thunderstorm Warning | PHI | Camden | 26 min |
| Jun 25, 5:48 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic | 57 min |
| Jun 26, 7:29 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 46 min |
| Jun 26, 8:11 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden | 64 min |
| Jun 26, 9:31 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden | 44 min |
| Jun 28, 4:55 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester | 65 min |
| Jun 28, 5:57 PM EDT | Severe Thunderstorm Warning | PHI | Burlington | 48 min |
| Jun 30, 1:05 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester | 55 min |
| Jul 1, 8:39 AM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Morris, Somerset | 66 min |
| Jul 1, 10:00 AM EDT | Severe Thunderstorm Warning | OKX | Bergen | 30 min |
| Jul 7, 7:27 PM EDT | Severe Thunderstorm Warning | PHI | Salem | 48 min |
| Jul 7, 8:05 PM EDT | Severe Thunderstorm Warning | PHI | Morris | 40 min |
| Jul 7, 8:38 PM EDT | Severe Thunderstorm Warning | PHI | Morris | 52 min |
| Jul 7, 8:53 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Passaic | 37 min |
| Jul 7, 9:31 PM EDT | Severe Thunderstorm Warning | OKX | Bergen | 29 min |
| Jul 18, 7:17 PM EDT | Severe Thunderstorm Warning | PHI | Ocean | 28 min |
| Jul 18, 7:33 PM EDT | Severe Thunderstorm Warning | PHI | Ocean | 57 min |
| Jul 20, 6:41 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Somerset | 64 min |
| Jul 20, 7:16 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 59 min |
| Jul 20, 8:49 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester | 56 min |
| Jul 20, 9:38 PM EDT | Severe Thunderstorm Warning | PHI | Burlington | 67 min |
| Jul 20, 9:51 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Ocean | 54 min |
| Jul 20, 9:59 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden | 61 min |
| Jul 21, 5:18 PM EDT | Severe Thunderstorm Warning | PHI | Burlington | 57 min |
| Jul 22, 5:00 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 75 min |
| Jul 28, 3:36 PM EDT | Severe Thunderstorm Warning | PHI | Morris | 39 min |
| Jul 29, 1:18 AM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 42 min |
| Aug 13, 6:23 AM EDT | Severe Thunderstorm Warning | PHI | Salem | 67 min |
| Aug 13, 7:05 AM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester, Salem | 40 min |
| Aug 13, 7:57 AM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 48 min |
| Aug 13, 8:44 AM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester, Salem | 61 min |
| Aug 13, 9:22 AM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 38 min |
| Aug 13, 9:43 AM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Ocean | 47 min |
| Aug 13, 10:32 AM EDT | Severe Thunderstorm Warning | PHI | Ocean | 28 min |
| Aug 28, 12:56 PM EDT | Severe Thunderstorm Warning | OKX | Bergen | 64 min |
| Sep 1, 3:44 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic | 61 min |
| Sep 1, 4:40 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 65 min |
| Sep 2, 10:16 AM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden | 74 min |
| Sep 2, 11:31 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Warren | 59 min |
| Sep 3, 1:12 AM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Passaic | 48 min |
| Sep 12, 11:35 AM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset | 55 min |
| Sep 12, 11:59 AM EDT | Severe Thunderstorm Warning | OKX | Essex, Passaic, Union | 46 min |
| Sep 12, 12:34 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Passaic | 41 min |
| Sep 12, 6:07 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Sussex, Warren | 68 min |
| Oct 7, 1:59 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon | 46 min |
| Oct 7, 2:33 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Passaic | 42 min |
| Oct 7, 3:06 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Hudson, Passaic, Union | 9 min |
| Oct 7, 3:18 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Hudson, Passaic, Union | 27 min |
| Nov 1, 7:53 AM EDT | Severe Thunderstorm Warning | PHI | Warren | 67 min |
| Nov 1, 8:37 AM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Morris, Somerset, Sussex, Warren | 68 min |
| Nov 1, 9:11 AM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester, Mercer, Middlesex and 4 more | 79 min |
| Nov 1, 9:14 AM EDT | Severe Thunderstorm Warning | OKX | Bergen, Essex, Passaic, Union | 46 min |
| Nov 1, 9:25 AM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Salem | 65 min |
| Nov 1, 9:45 AM EDT | Severe Thunderstorm Warning | OKX | Bergen | 45 min |
| Nov 1, 10:29 AM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Cumberland, Monmouth, Ocean | 76 min |
| Nov 18, 2:46 AM EST | Severe Thunderstorm Warning | PHI | Salem | 59 min |
| Nov 18, 2:54 AM EST | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 66 min |
| Nov 18, 2:57 AM EST | Severe Thunderstorm Warning | OKX | Passaic | 63 min |
| Nov 18, 3:29 AM EST | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cumberland, Gloucester, Hunterdon and 6 more | 61 min |
| Nov 18, 3:39 AM EST | Severe Thunderstorm Warning | PHI | Atlantic, Cape May, Cumberland | 66 min |
| Nov 18, 3:55 AM EST | Severe Thunderstorm Warning | OKX | Bergen, Essex, Hudson, Passaic, Union | 50 min |
| Nov 18, 4:06 AM EST | Severe Thunderstorm Warning | PHI | Middlesex, Somerset | 24 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Burlington County24
- Camden County18
- Atlantic County17
- Ocean County17
- Salem County16
- Bergen County14
- Gloucester County14
- Hunterdon County12
- Morris County12
- Somerset County12
- Passaic County12
- Warren County10
- Essex County9
- Cumberland County9
- Middlesex County7
- Union County7
- Monmouth County7
- Mercer County5
- Hudson County5
- Cape May County5
- Sussex County4
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20122014
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.