Alert archive / New Jersey / Salem County
Weather alerts in Salem County, New Jersey, 2017
182 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Salem County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 182
- Warnings
- 46
- Watches
- 23
- Advisories
- 71
- Busiest month
- July51 alerts
- Busiest day
- July 14, 201715 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Salem County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 30 | 18 | 40% | 8 | 75% | 20 min |
| Flash flood warnings | 5 | 4 | 20% | 0 |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Philadelphia/Mount Holly: tornado warnings | 13 | 1 | 92% | 6 | 33% | 2 min |
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 197 | 120 | 39% | 396 | 79% | 26 min |
| NWS Philadelphia/Mount Holly: flash flood warnings | 52 | 15 | 71% | 54 | 78% | 91 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 1, 3:15 PM EST | Freezing Rain Advisory | PHI | 23 hr |
| Jan 5, 11:13 AM EST | Winter Weather Advisory | PHI | 18 hr |
| Jan 5, 3:41 PM EST | Winter Storm Watch | PHI | 337 days |
| Jan 6, 9:37 AM EST | Winter Storm Warning | PHI | 34 hr |
| Jan 6, 4:42 PM EST | Winter Weather Advisory | PHI | 25 hr |
| Jan 21, 8:58 AM EST | Dense Fog Advisory | PHI | 2 hr |
| Jan 21, 3:29 PM EST | Dense Fog Advisory | PHI | 22 hr |
| Jan 22, 3:28 AM EST | Coastal Flood Advisory | PHI | 36 hr |
| Jan 22, 3:44 AM EST | High Wind Warning | PHI | 40 hr |
| Jan 22, 3:44 AM EST | Wind Advisory | PHI | 38 hr |
| Jan 23, 4:13 AM EST | Coastal Flood Warning | PHI | 31 hr |
| Jan 23, 5:44 PM EST | Wind Advisory | PHI | 115 min |
| Jan 26, 11:15 AM EST | Wind Advisory | PHI | 7 hr |
| Jan 29, 3:24 AM EST | Winter Weather Advisory | PHI | 29 hr |
| Feb 7, 3:29 PM EST | Winter Storm Watch | PHI | 13 hr |
| Feb 8, 4:01 AM EST | Winter Storm Warning | PHI | 36 hr |
| Feb 9, 3:35 AM EST | Wind Advisory | PHI | 18 hr |
| Feb 12, 3:55 AM EST | High Wind Watch | PHI | 11 hr |
| Feb 12, 2:45 PM EST | High Wind Warning | PHI | 22 hr |
| Feb 12, 2:45 PM EST | Wind Advisory | PHI | 27 hr |
| Feb 12, 11:10 PM EST | Severe Thunderstorm Warning | PHI | 50 min |
| Feb 12, 11:53 PM EST | Severe Thunderstorm Warning | PHI | 52 min |
| Feb 23, 2:58 AM EST | Dense Fog Advisory | PHI | 7 hr |
| Feb 25, 1:30 PM EST | Severe Thunderstorm Watch | SPC | 6 hr |
| Feb 25, 4:26 PM EST | Mesoscale Discussion | SPC | 94 min |
| Feb 25, 4:40 PM EST | Severe Thunderstorm Warning | PHI | 50 min |
| Feb 25, 5:17 PM EST | Severe Thunderstorm Warning | PHI | 43 min |
| Feb 25, 5:23 PM EST | Severe Thunderstorm Warning | PHI | 52 min |
| Mar 1, 12:50 PM EST | Mesoscale Discussion | SPC | 55 min |
| Mar 1, 1:13 PM EST | Severe Thunderstorm Watch | SPC | 4 hr |
| Mar 1, 2:00 PM EST | Severe Thunderstorm Warning | PHI | 45 min |
| Mar 1, 2:50 PM EST | Mesoscale Discussion | SPC | 55 min |
| Mar 1, 3:09 PM EST | Wind Advisory | PHI | 19 hr |
| Mar 1, 3:16 PM EST | Special Weather Statement | PHI | 44 min |
| Mar 2, 2:47 AM EST | High Wind Warning | PHI | 7 hr |
| Mar 3, 3:04 PM EST | Special Weather Statement | PHI | 41 min |
| Mar 10, 10:46 AM EST | Special Weather Statement | PHI | 74 min |
| Mar 10, 4:15 PM EST | Special Weather Statement | PHI | 45 min |
| Mar 11, 3:52 PM EST | Winter Storm Watch | PHI | 35 hr |
| Mar 12, 3:08 PM EDT | Winter Storm Warning | PHI | 48 hr |
| Mar 13, 4:03 AM EDT | Coastal Flood Advisory | PHI | 35 hr |
| Mar 14, 5:57 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Mar 14, 9:02 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Mar 15, 3:41 AM EDT | Wind Advisory | PHI | 16 hr |
| Mar 27, 3:30 AM EDT | Dense Fog Advisory | PHI | 6 hr |
| Mar 31, 3:41 AM EDT | Flood Watch | PHI | 20 hr |
| Mar 31, 4:50 PM EDT | Areal Flood Advisory | PHI | 9 hr |
| Apr 4, 3:09 PM EDT | Flood Watch | PHI | 54 hr |
| Apr 6, 12:18 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Apr 6, 12:45 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 6, 1:00 PM EDT | Special Weather Statement | PHI | 60 min |
| Apr 6, 2:07 PM EDT | Special Weather Statement | PHI | 53 min |
| Apr 6, 2:29 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Apr 6, 2:56 PM EDT | Special Weather Statement | PHI | 64 min |
| Apr 6, 3:12 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Apr 24, 8:54 PM EDT | Coastal Flood Advisory | PHI | 27 hr |
| May 1, 7:16 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 5, 9:12 AM EDT | Special Weather Statement | PHI | 33 min |
| May 5, 11:14 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| May 5, 11:33 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| May 19, 3:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| May 22, 7:25 AM EDT | Areal Flood Advisory | PHI | 9 hr |
| May 23, 3:02 PM EDT | Coastal Flood Advisory | PHI | 34 hr |
| May 25, 5:29 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| May 25, 5:51 PM EDT | Special Weather Statement | PHI | 24 min |
| May 25, 7:56 PM EDT | Severe Thunderstorm Warning | PHI | 49 min |
| May 25, 8:39 PM EDT | Special Weather Statement | PHI | 51 min |
| May 27, 4:02 AM EDT | Coastal Flood Advisory | PHI | 23 hr |
| May 28, 4:04 AM EDT | Coastal Flood Advisory | PHI | 24 hr |
| Jun 6, 2:34 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jun 6, 3:25 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jun 6, 3:52 PM EDT | Special Weather Statement | PHI | 38 min |
| Jun 14, 7:51 AM EDT | Special Weather Statement | PHI | 39 min |
| Jun 18, 3:30 AM EDT | Flash Flood Watch | PHI | 39 hr |
| Jun 19, 11:13 AM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 19, 2:21 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jun 19, 4:07 PM EDT | Severe Thunderstorm Warning | PHI | 38 min |
| Jun 19, 4:34 PM EDT | Severe Thunderstorm Warning | PHI | 41 min |
| Jun 19, 4:42 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jun 19, 5:15 PM EDT | Severe Thunderstorm Warning | PHI | 45 min |
| Jun 19, 5:44 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jun 21, 2:38 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 21, 6:27 PM EDT | Special Weather Statement | PHI | 33 min |
| Jun 21, 6:31 PM EDT | Severe Thunderstorm Warning | PHI | 44 min |
| Jun 23, 8:25 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Jun 24, 6:20 AM EDT | Special Weather Statement | PHI | 55 min |
| Jul 1, 1:34 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 1, 5:01 PM EDT | Severe Thunderstorm Warning | PHI | 44 min |
| Jul 1, 5:35 PM EDT | Severe Thunderstorm Warning | PHI | 40 min |
| Jul 1, 5:41 PM EDT | Special Weather Statement | PHI | 34 min |
| Jul 6, 4:16 PM EDT | Flash Flood Watch | PHI | 3 hr |
| Jul 7, 8:23 PM EDT | Special Weather Statement | PHI | 67 min |
| Jul 11, 3:00 PM EDT | Severe Thunderstorm Warning | PHI | 45 min |
| Jul 12, 3:10 PM EDT | Heat Advisory | PHI | 29 hr |
| Jul 13, 11:09 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 13, 8:27 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 13, 9:07 PM EDT | Severe Thunderstorm Warning | PHI | 53 min |
| Jul 14, 11:40 AM EDT | Flash Flood Watch | PHI | 11 hr |
| Jul 14, 1:09 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 1:40 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 14, 3:18 PM EDT | Severe Thunderstorm Warning | PHI | 12 min |
| Jul 14, 3:23 PM EDT | Severe Thunderstorm Warning | PHI | 67 min |
| Jul 14, 3:25 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 14, 3:34 PM EDT | Flash Flood Warning | PHI | 3 hr |
| Jul 14, 3:43 PM EDT | Severe Thunderstorm Warning | PHI | 47 min |
| Jul 14, 3:54 PM EDT | Severe Thunderstorm Warning | PHI | 66 min |
| Jul 14, 4:13 PM EDT | Flash Flood Warning | PHI | 3 hr |
| Jul 14, 4:23 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jul 14, 4:44 PM EDT | Severe Thunderstorm Warning | PHI | 61 min |
| Jul 14, 7:28 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jul 20, 3:43 AM EDT | Heat Advisory | PHI | 15 hr |
| Jul 23, 3:16 PM EDT | Flash Flood Watch | PHI | 15 hr |
| Jul 23, 3:44 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 23, 4:39 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 23, 9:39 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 23, 10:18 PM EDT | Flash Flood Warning | PHI | 8 hr |
| Jul 23, 10:23 PM EDT | Severe Thunderstorm Warning | PHI | 52 min |
| Jul 23, 11:43 PM EDT | Areal Flood Advisory | PHI | 6 hr |
| Jul 24, 12:04 AM EDT | Severe Thunderstorm Warning | PHI | 41 min |
| Jul 24, 12:41 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 24, 1:33 AM EDT | Areal Flood Advisory | PHI | 5 hr |
| Jul 24, 2:02 AM EDT | Severe Thunderstorm Warning | PHI | 43 min |
| Jul 24, 2:34 AM EDT | Severe Thunderstorm Warning | PHI | 41 min |
| Jul 24, 3:00 AM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 24, 3:03 AM EDT | Severe Thunderstorm Warning | PHI | 57 min |
| Jul 24, 2:17 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 24, 6:09 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 24, 8:59 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Jul 24, 9:01 PM EDT | Special Weather Statement | PHI | 59 min |
| Jul 24, 10:01 PM EDT | Areal Flood Advisory | PHI | 119 min |
| Jul 24, 10:38 PM EDT | Severe Thunderstorm Warning | PHI | 52 min |
| Jul 25, 3:14 AM EDT | Areal Flood Warning | PHI | 6 hr |
| Jul 26, 11:42 AM EDT | Areal Flood Warning | PHI | 33 hr |
| Jul 27, 3:08 PM EDT | Flash Flood Watch | PHI | 42 hr |
| Jul 28, 11:13 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 29, 1:10 AM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 29, 3:03 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 2, 1:30 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 4:06 PM EDT | Special Weather Statement | PHI | 39 min |
| Aug 2, 4:27 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 2, 5:28 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 3, 4:51 PM EDT | Special Weather Statement | PHI | 24 min |
| Aug 6, 3:12 PM EDT | Flash Flood Watch | PHI | 26 hr |
| Aug 7, 9:59 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 7, 12:36 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 16, 3:11 AM EDT | Dense Fog Advisory | PHI | 5 hr |
| Aug 18, 3:39 AM EDT | Flash Flood Watch | PHI | 18 hr |
| Aug 18, 1:54 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 18, 2:27 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 18, 4:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Aug 18, 5:20 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 18, 5:39 PM EDT | Severe Thunderstorm Warning | PHI | 66 min |
| Aug 18, 6:38 PM EDT | Special Weather Statement | PHI | 37 min |
| Aug 18, 6:48 PM EDT | Special Weather Statement | PHI | 27 min |
| Aug 18, 7:19 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 22, 4:19 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 22, 10:07 PM EDT | Severe Thunderstorm Warning | PHI | 53 min |
| Aug 22, 10:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Aug 22, 10:58 PM EDT | Severe Thunderstorm Warning | PHI | 62 min |
| Aug 22, 11:46 PM EDT | Severe Thunderstorm Warning | PHI | 44 min |
| Aug 23, 1:56 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 23, 2:43 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 29, 2:14 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 29, 2:26 PM EDT | Areal Flood Advisory | PHI | 6 hr |
| Sep 18, 7:27 AM EDT | Coastal Flood Advisory | PHI | 20 hr |
| Sep 19, 2:58 AM EDT | Coastal Flood Advisory | PHI | 22 hr |
| Sep 20, 12:58 AM EDT | Coastal Flood Advisory | PHI | 25 hr |
| Oct 11, 9:28 PM EDT | Coastal Flood Advisory | PHI | 22 hr |
| Oct 23, 3:04 PM EDT | Wind Advisory | PHI | 24 hr |
| Oct 26, 3:36 AM EDT | Frost Advisory | PHI | 29 hr |
| Oct 28, 3:52 AM EDT | Flash Flood Watch | PHI | 48 hr |
| Oct 29, 3:23 AM EDT | Wind Advisory | PHI | 32 hr |
| Oct 29, 7:19 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Nov 3, 3:44 AM EDT | Dense Fog Advisory | PHI | 5 hr |
| Nov 9, 3:34 AM EST | Freeze Watch | PHI | 11 hr |
| Nov 9, 2:15 PM EST | Freeze Warning | PHI | 44 hr |
| Nov 18, 2:46 PM EST | Wind Advisory | PHI | 24 hr |
| Dec 8, 3:04 AM EST | Winter Weather Advisory | PHI | 45 hr |
| Dec 8, 3:34 PM EST | Winter Storm Warning | PHI | 33 hr |
| Dec 15, 3:26 AM EST | Winter Weather Advisory | PHI | 18 hr |
| Dec 24, 3:18 AM EST | Wind Advisory | PHI | 35 hr |
| Dec 29, 11:52 PM EST | Winter Weather Advisory | PHI | 14 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 | 30 |
| Severe Thunderstorm Watch | 8 |
| Mesoscale Discussion | 21 |
| Special Weather Statement | 21 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 5 |
| Flash Flood Watch | 8 |
| Flood Watch | 2 |
| Areal Flood Advisory | 34 |
| Winter | |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 3 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 6 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 1 |
| Wind Advisory | 11 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
| Coast and beach | |
| Coastal Flood Warning | 1 |
| Coastal Flood Advisory | 10 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.