Alert archive / New Jersey / Sussex County
Weather alerts in Sussex County, New Jersey, 2021
185 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Sussex County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 185
- Warnings
- 44
- Watches
- 30
- Advisories
- 45
- Busiest month
- July60 alerts
- Busiest day
- July 16, 202110 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Sussex County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 25 | 21 | 16% | 25 | 88% | 21 min |
| Flash flood warnings | 6 | 3 | 50% | 1 | 100% | 241 min |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Philadelphia/Mount Holly: tornado warnings | 52 | 18 | 65% | 29 | 76% | 11 min |
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 324 | 218 | 33% | 1,015 | 81% | 23 min |
| NWS Philadelphia/Mount Holly: flash flood warnings | 92 | 65 | 29% | 559 | 96% | 164 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 2, 2:55 PM EST | Winter Weather Advisory | PHI | 37 hr |
| Jan 22, 5:05 PM EST | Special Weather Statement | PHI | 55 min |
| Jan 25, 3:08 PM EST | Winter Weather Advisory | PHI | 34 hr |
| Jan 30, 3:44 PM EST | Winter Storm Watch | PHI | 6 hr |
| Jan 30, 3:44 PM EST | Winter Storm Warning | PHI | 72 hr |
| Feb 1, 7:13 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 1, 1:43 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 1, 7:27 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 6, 3:23 AM EST | Winter Weather Advisory | PHI | 36 hr |
| Feb 8, 3:00 PM EST | Winter Weather Advisory | PHI | 24 hr |
| Feb 12, 3:21 PM EST | Winter Weather Advisory | PHI | 43 hr |
| Feb 14, 3:15 PM EST | Ice Storm Warning | PHI | 41 hr |
| Feb 15, 9:16 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 16, 3:14 PM EST | Winter Storm Watch | PHI | 24 hr |
| Feb 17, 3:43 PM EST | Winter Storm Warning | PHI | 24 hr |
| Feb 17, 3:43 PM EST | Winter Weather Advisory | PHI | 47 hr |
| Feb 18, 9:47 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 20, 7:15 PM EST | Special Weather Statement | PHI | 45 min |
| Feb 21, 2:47 PM EST | Winter Weather Advisory | PHI | 26 hr |
| Feb 22, 7:48 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 28, 3:14 PM EST | Wind Advisory | PHI | 42 hr |
| Mar 12, 9:24 AM EST | Wind Advisory | PHI | 21 hr |
| Mar 13, 2:44 PM EST | Wind Advisory | PHI | 28 hr |
| Mar 24, 7:09 PM EDT | Dense Fog Advisory | PHI | 14 hr |
| Mar 25, 11:00 AM EDT | Wind Advisory | PHI | 32 hr |
| Apr 20, 8:48 PM EDT | Freeze Watch | PHI | 7 hr |
| Apr 21, 3:26 AM EDT | Freeze Warning | PHI | 30 hr |
| Apr 21, 11:49 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 21, 12:28 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 21, 12:51 PM EDT | Severe Thunderstorm Warning | PHI | 21 min |
| Apr 21, 1:17 PM EDT | Special Weather Statement | PHI | 58 min |
| Apr 22, 8:58 AM EDT | Freeze Watch | PHI | 6 hr |
| Apr 22, 2:31 PM EDT | Freeze Warning | PHI | 17 hr |
| Apr 28, 8:05 PM EDT | Special Weather Statement | PHI | 40 min |
| Apr 28, 8:17 PM EDT | Severe Thunderstorm Warning | PHI | 43 min |
| Apr 29, 3:32 AM EDT | High Wind Watch | PHI | 16 hr |
| Apr 29, 7:23 PM EDT | High Wind Warning | PHI | 26 hr |
| Apr 30, 8:56 PM EDT | Wind Advisory | PHI | 6 hr |
| May 23, 1:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| May 26, 2:48 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 26, 4:41 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 3, 2:48 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 4, 1:07 PM EDT | Special Weather Statement | PHI | 38 min |
| Jun 4, 1:49 PM EDT | Severe Thunderstorm Warning | PHI | 41 min |
| Jun 4, 2:26 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jun 4, 2:43 PM EDT | Severe Thunderstorm Warning | PHI | 62 min |
| Jun 4, 2:49 PM EDT | Areal Flood Advisory | PHI | 70 min |
| Jun 7, 2:19 PM EDT | Areal Flood Advisory | PHI | 81 min |
| Jun 8, 1:54 PM EDT | Areal Flood Advisory | PHI | 95 min |
| Jun 9, 3:19 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 14, 2:06 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 14, 5:53 PM EDT | Special Weather Statement | PHI | 37 min |
| Jun 14, 6:18 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 14, 6:24 PM EDT | Special Weather Statement | PHI | 36 min |
| Jun 14, 6:48 PM EDT | Severe Thunderstorm Warning | PHI | 42 min |
| Jun 19, 5:59 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Jun 21, 4:33 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 21, 6:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jun 21, 8:13 PM EDT | Severe Thunderstorm Warning | PHI | 62 min |
| Jun 27, 3:19 AM EDT | Heat Advisory | PHI | 4 days |
| Jun 30, 2:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jun 30, 3:21 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 30, 6:58 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 2, 3:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 2, 4:47 PM EDT | Special Weather Statement | PHI | 28 min |
| Jul 2, 6:53 PM EDT | Severe Thunderstorm Warning | PHI | 52 min |
| Jul 2, 7:25 PM EDT | Severe Thunderstorm Warning | PHI | 50 min |
| Jul 5, 3:21 AM EDT | Heat Advisory | PHI | 65 hr |
| Jul 6, 12:33 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 1:32 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 6, 4:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jul 6, 5:15 PM EDT | Severe Thunderstorm Warning | PHI | 60 min |
| Jul 6, 5:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 6, 5:46 PM EDT | Severe Thunderstorm Warning | PHI | 59 min |
| Jul 7, 1:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 7, 2:41 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jul 7, 3:32 PM EDT | Flash Flood Watch | PHI | 42 hr |
| Jul 7, 4:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 7, 7:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 7, 11:37 PM EDT | Special Weather Statement | PHI | 38 min |
| Jul 8, 1:44 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 8, 2:09 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 8, 4:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jul 8, 5:34 PM EDT | Severe Thunderstorm Warning | PHI | 41 min |
| Jul 8, 6:09 PM EDT | Severe Thunderstorm Warning | PHI | 51 min |
| Jul 8, 6:16 PM EDT | Severe Thunderstorm Warning | PHI | 44 min |
| Jul 9, 4:35 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 9, 5:34 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Jul 9, 7:39 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Jul 9, 9:12 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Jul 11, 3:45 PM EDT | Flash Flood Watch | PHI | 36 hr |
| Jul 12, 1:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jul 12, 3:34 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 12, 5:08 PM EDT | Areal Flood Advisory | PHI | 5 hr |
| Jul 12, 5:36 PM EDT | Special Weather Statement | PHI | 24 min |
| Jul 12, 5:57 PM EDT | Severe Thunderstorm Warning | PHI | 63 min |
| Jul 12, 6:52 PM EDT | Severe Thunderstorm Warning | PHI | 34 min |
| Jul 12, 7:11 PM EDT | Flash Flood Warning | PHI | 35 min |
| Jul 12, 7:25 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 12, 9:53 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jul 13, 3:44 PM EDT | Dense Fog Advisory | PHI | 14 hr |
| Jul 16, 2:55 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 16, 3:17 PM EDT | Flash Flood Watch | PHI | 35 hr |
| Jul 16, 5:01 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Jul 16, 5:21 PM EDT | Flash Flood Warning | PHI | 2 hr |
| Jul 16, 5:25 PM EDT | Special Weather Statement | PHI | 35 min |
| Jul 16, 5:29 PM EDT | Severe Thunderstorm Warning | PHI | 46 min |
| Jul 16, 5:34 PM EDT | Areal Flood Advisory | PHI | 112 min |
| Jul 16, 5:51 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jul 16, 6:14 PM EDT | Special Weather Statement | PHI | 31 min |
| Jul 16, 6:27 PM EDT | Areal Flood Advisory | PHI | 59 min |
| Jul 17, 12:00 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 17, 1:13 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jul 17, 4:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jul 17, 6:54 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 21, 11:56 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 27, 4:36 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 27, 5:38 PM EDT | Severe Thunderstorm Warning | PHI | 24 min |
| Jul 27, 6:07 PM EDT | Severe Thunderstorm Warning | PHI | 23 min |
| Jul 27, 6:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 29, 2:23 PM EDT | Tornado Watch | SPC | 8 hr |
| Jul 29, 4:57 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jul 29, 5:03 PM EDT | Severe Thunderstorm Warning | PHI | 42 min |
| Aug 10, 3:33 AM EDT | Heat Advisory | PHI | 4 days |
| Aug 11, 5:57 PM EDT | Special Weather Statement | PHI | 48 min |
| Aug 11, 6:32 PM EDT | Special Weather Statement | PHI | 28 min |
| Aug 11, 6:44 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Aug 11, 6:50 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 11, 7:04 PM EDT | Severe Thunderstorm Warning | PHI | 41 min |
| Aug 11, 8:10 PM EDT | Severe Thunderstorm Warning | PHI | 35 min |
| Aug 12, 3:33 PM EDT | Severe Thunderstorm Warning | PHI | 57 min |
| Aug 12, 4:11 PM EDT | Severe Thunderstorm Warning | PHI | 34 min |
| Aug 12, 10:08 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Aug 12, 11:49 PM EDT | Special Weather Statement | PHI | 56 min |
| Aug 21, 3:27 AM EDT | Flood Watch | PHI | 53 hr |
| Aug 22, 5:07 PM EDT | Areal Flood Advisory | PHI | 6 hr |
| Aug 22, 5:48 PM EDT | Flash Flood Warning | PHI | 6 hr |
| Aug 22, 8:47 PM EDT | Flash Flood Warning | PHI | 6 hr |
| Aug 23, 2:26 PM EDT | Areal Flood Warning | PHI | 14 hr |
| Aug 30, 5:00 AM EDT | Flash Flood Watch | PHI | 71 hr |
| Sep 1, 11:24 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 1, 6:08 PM EDT | Flash Flood Warning | PHI | 6 hr |
| Sep 2, 12:01 AM EDT | Areal Flood Warning | PHI | 40 hr |
| Sep 2, 4:45 AM EDT | River Flood Warning | PHI | 5 hr |
| Sep 7, 2:33 PM EDT | Flash Flood Watch | PHI | 37 hr |
| Sep 8, 4:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 8, 7:54 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 8, 9:16 PM EDT | Special Weather Statement | PHI | 29 min |
| Sep 8, 9:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Sep 8, 9:43 PM EDT | Special Weather Statement | PHI | 47 min |
| Sep 8, 11:30 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Sep 13, 9:03 PM EDT | Areal Flood Advisory | PHI | 109 min |
| Sep 15, 10:33 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 15, 3:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Sep 15, 3:43 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 15, 8:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 15, 8:53 PM EDT | Special Weather Statement | PHI | 37 min |
| Sep 22, 3:24 AM EDT | Flash Flood Watch | PHI | 41 hr |
| Sep 23, 1:29 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Sep 23, 2:37 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 23, 4:21 PM EDT | Areal Flood Advisory | PHI | 15 min |
| Sep 23, 4:36 PM EDT | Flash Flood Warning | PHI | 3 hr |
| Oct 14, 3:16 AM EDT | Dense Fog Advisory | PHI | 3 hr |
| Oct 16, 3:41 PM EDT | Special Weather Statement | PHI | 49 min |
| Oct 24, 3:09 PM EDT | Flash Flood Watch | PHI | 48 hr |
| Oct 26, 5:22 AM EDT | Areal Flood Advisory | PHI | 2 hr |
| Oct 26, 7:38 AM EDT | Areal Flood Warning | PHI | 37 hr |
| Oct 27, 2:59 AM EDT | Areal Flood Warning | PHI | 11 hr |
| Oct 27, 4:26 AM EDT | River Flood Warning | PHI | 26 hr |
| Oct 29, 8:44 PM EDT | Special Weather Statement | PHI | 31 min |
| Oct 29, 9:52 PM EDT | Special Weather Statement | PHI | 23 min |
| Nov 1, 2:25 PM EDT | Freeze Watch | PHI | 13 hr |
| Nov 2, 3:30 AM EDT | Freeze Warning | PHI | 30 hr |
| Nov 12, 9:35 AM EST | Special Weather Statement | PHI | 55 min |
| Nov 13, 12:22 PM EST | Severe Thunderstorm Warning | PHI | 53 min |
| Nov 13, 12:27 PM EST | Severe Thunderstorm Watch | SPC | 6 hr |
| Dec 2, 8:00 PM EST | Special Weather Statement | PHI | 45 min |
| Dec 2, 8:48 PM EST | Special Weather Statement | PHI | 42 min |
| Dec 10, 3:58 AM EST | Wind Advisory | PHI | 45 hr |
| Dec 11, 7:29 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Dec 11, 9:21 PM EST | Severe Thunderstorm Warning | PHI | 29 min |
| Dec 24, 9:37 AM EST | Winter Weather Advisory | PHI | 23 hr |
| Dec 26, 2:55 PM EST | Winter Weather Advisory | PHI | 40 hr |
| Dec 28, 2:48 PM EST | Winter Weather Advisory | PHI | 12 hr |
| Dec 30, 9:33 PM EST | Dense Fog Advisory | PHI | 11 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 | 25 |
| Severe Thunderstorm Watch | 15 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 42 |
| Special Weather Statement | 24 |
| Flooding | |
| Areal Flood Warning | 4 |
| Flash Flood Warning | 6 |
| River Flood Warning | 2 |
| Flash Flood Watch | 7 |
| Flood Watch | 1 |
| Areal Flood Advisory | 22 |
| Winter | |
| Ice Storm Warning | 1 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 10 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 6 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.