Alert archive / New Jersey / Somerset County
Weather alerts in Somerset County, New Jersey, 2017
164 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Somerset County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 164
- Warnings
- 34
- Watches
- 21
- Advisories
- 51
- Busiest month
- July29 alerts
- Busiest day
- August 18, 20179 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Somerset County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 18 | 14 | 22% | 3 | 100% | 24 min |
| Flash flood warnings | 3 | 2 | 33% | 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 6, 4:42 PM EST | Winter Weather Advisory | PHI | 25 hr |
| Jan 9, 2:55 PM EST | Winter Weather Advisory | PHI | 36 hr |
| Jan 21, 3:29 PM EST | Dense Fog Advisory | PHI | 22 hr |
| Jan 22, 3:44 AM EST | Wind Advisory | PHI | 38 hr |
| Jan 22, 3:17 PM EST | Flood Watch | PHI | 36 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, 4:55 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 11, 3:58 AM EST | Winter Weather Advisory | PHI | 44 hr |
| Feb 12, 3:55 AM EST | High Wind Watch | PHI | 11 hr |
| Feb 12, 2:45 PM EST | Wind Advisory | PHI | 27 hr |
| Feb 13, 1:25 AM EST | Special Weather Statement | PHI | 50 min |
| Feb 23, 2:58 AM EST | Dense Fog Advisory | PHI | 7 hr |
| Feb 25, 12:16 PM EST | Mesoscale Discussion | SPC | 89 min |
| Feb 25, 2:46 PM EST | Severe Thunderstorm Watch | SPC | 5 hr |
| Feb 25, 4:44 PM EST | Mesoscale Discussion | SPC | 91 min |
| Feb 25, 4:54 PM EST | Severe Thunderstorm Warning | PHI | 51 min |
| Feb 25, 5:01 PM EST | Special Weather Statement | PHI | 44 min |
| Feb 25, 5:17 PM EST | Severe Thunderstorm Warning | PHI | 43 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, 2:50 PM EST | Mesoscale Discussion | SPC | 55 min |
| Mar 1, 2:55 PM EST | Special Weather Statement | PHI | 35 min |
| Mar 1, 3:09 PM EST | Wind Advisory | PHI | 19 hr |
| Mar 2, 2:47 AM EST | High Wind Warning | PHI | 7 hr |
| Mar 3, 4:54 PM EST | Special Weather Statement | PHI | 36 min |
| Mar 3, 7:45 PM EST | Special Weather Statement | PHI | 30 min |
| Mar 9, 3:35 AM EST | Winter Weather Advisory | PHI | 34 hr |
| Mar 10, 8:18 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Mar 10, 10:46 AM EST | Special Weather Statement | PHI | 74 min |
| Mar 10, 2:44 PM EST | Special Weather Statement | PHI | 31 min |
| Mar 10, 3:14 PM EST | Special Weather Statement | PHI | 61 min |
| Mar 10, 5:57 PM EST | Special Weather Statement | PHI | 48 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, 4:21 AM EDT | Blizzard Warning | PHI | 34 hr |
| Mar 14, 3:22 AM EDT | Mesoscale Discussion | SPC | 5 hr |
| Mar 14, 9:02 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Mar 14, 9:04 AM EDT | Mesoscale Discussion | SPC | 4 hr |
| Mar 14, 11:05 PM EDT | Winter Weather Advisory | PHI | 21 hr |
| Mar 15, 3:57 PM EDT | Special Weather Statement | PHI | 33 min |
| Mar 15, 4:39 PM EDT | Special Weather Statement | PHI | 51 min |
| Mar 15, 4:40 PM EDT | Special Weather Statement | PHI | 50 min |
| Mar 31, 3:41 AM EDT | Flood Watch | PHI | 20 hr |
| Mar 31, 5:20 PM EDT | Areal Flood Warning | PHI | 3 hr |
| Mar 31, 6:30 PM EDT | Areal Flood Advisory | PHI | 7 hr |
| Mar 31, 8:17 PM EDT | Areal Flood Warning | PHI | 3 hr |
| Mar 31, 9:26 PM EDT | River Flood Warning | PHI | 35 hr |
| Apr 2, 3:24 PM EDT | Flood Watch | PHI | 36 hr |
| Apr 4, 2:52 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Apr 4, 3:09 PM EDT | Flood Watch | PHI | 54 hr |
| Apr 6, 2:07 PM EDT | Special Weather Statement | PHI | 53 min |
| Apr 6, 7:41 PM EDT | Areal Flood Warning | PHI | 3 hr |
| Apr 16, 3:58 PM EDT | Special Weather Statement | PHI | 32 min |
| Apr 29, 4:14 AM EDT | Special Weather Statement | PHI | 46 min |
| Apr 29, 4:20 AM EDT | Severe Thunderstorm Warning | PHI | 40 min |
| Apr 29, 4:29 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Apr 29, 4:32 AM EDT | Severe Thunderstorm Warning | PHI | 43 min |
| Apr 29, 7:04 AM EDT | Areal Flood Warning | PHI | 4 hr |
| May 1, 7:16 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 5, 1:02 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| May 13, 12:28 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| May 19, 3:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| May 25, 10:32 PM EDT | Areal Flood Warning | PHI | 4 hr |
| May 31, 8:04 PM EDT | Severe Thunderstorm Warning | PHI | 36 min |
| May 31, 8:39 PM EDT | Special Weather Statement | PHI | 36 min |
| Jun 17, 11:19 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| 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, 3:54 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jun 19, 3:56 PM EDT | Severe Thunderstorm Warning | PHI | 49 min |
| Jun 19, 5:06 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jun 19, 5:09 PM EDT | Severe Thunderstorm Warning | PHI | 51 min |
| Jun 21, 2:38 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 23, 3:35 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jun 23, 5:09 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 23, 6:58 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jun 23, 7:06 PM EDT | Special Weather Statement | PHI | 24 min |
| Jun 23, 7:30 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jun 23, 8:25 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Jun 24, 3:25 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jun 24, 6:54 AM EDT | Mesoscale Discussion | SPC | 66 min |
| Jun 24, 7:09 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jun 24, 7:21 AM EDT | Flash Flood Warning | PHI | 4 hr |
| Jun 24, 7:26 AM EDT | Flash Flood Warning | PHI | 4 hr |
| Jun 27, 5:56 PM EDT | Special Weather Statement | PHI | 34 min |
| Jul 1, 1:34 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 1, 5:08 PM EDT | Severe Thunderstorm Warning | PHI | 52 min |
| Jul 1, 5:50 PM EDT | Severe Thunderstorm Warning | PHI | 40 min |
| Jul 1, 6:17 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 7, 9:51 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jul 7, 12:11 PM EDT | Areal Flood Warning | PHI | 4 hr |
| Jul 12, 3:10 PM EDT | Heat Advisory | PHI | 29 hr |
| Jul 13, 11:09 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 13, 2:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jul 13, 2:57 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 13, 4:06 PM EDT | Areal Flood Advisory | PHI | 114 min |
| Jul 13, 4:40 PM EDT | Special Weather Statement | PHI | 50 min |
| Jul 13, 4:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 13, 4:50 PM EDT | Severe Thunderstorm Warning | PHI | 55 min |
| Jul 14, 2:57 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jul 20, 3:43 AM EDT | Heat Advisory | PHI | 15 hr |
| Jul 20, 4:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 20, 5:03 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 20, 7:00 PM EDT | Severe Thunderstorm Warning | PHI | 60 min |
| Jul 20, 7:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 20, 7:52 PM EDT | Severe Thunderstorm Warning | PHI | 53 min |
| Jul 20, 7:56 PM EDT | Special Weather Statement | PHI | 49 min |
| Jul 22, 7:10 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 22, 10:52 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 23, 3:16 PM EDT | Flash Flood Watch | PHI | 15 hr |
| Jul 24, 3:36 AM EDT | Areal Flood Advisory | PHI | 6 hr |
| Jul 24, 9:30 AM EDT | Areal Flood Advisory | PHI | 60 min |
| Jul 24, 2:17 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 28, 5:49 AM EDT | Dense Fog Advisory | PHI | 3 hr |
| Aug 2, 1:30 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 2:42 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 2, 3:58 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 2, 4:39 PM EDT | Special Weather Statement | PHI | 36 min |
| Aug 3, 5:54 PM EDT | Special Weather Statement | PHI | 36 min |
| Aug 3, 6:28 PM EDT | Mesoscale Discussion | SPC | 62 min |
| 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, 5:11 PM EDT | Severe Thunderstorm Warning | PHI | 49 min |
| Aug 18, 5:46 PM EDT | Severe Thunderstorm Warning | PHI | 44 min |
| Aug 18, 6:13 PM EDT | Special Weather Statement | PHI | 32 min |
| Aug 18, 6:20 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 18, 6:23 PM EDT | Special Weather Statement | PHI | 37 min |
| Aug 21, 3:14 PM EDT | Heat Advisory | PHI | 29 hr |
| Aug 22, 3:08 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Aug 22, 4:19 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 22, 7:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Aug 22, 8:45 PM EDT | Severe Thunderstorm Warning | PHI | 60 min |
| Aug 22, 9:42 PM EDT | Severe Thunderstorm Warning | PHI | 48 min |
| Aug 22, 10:27 PM EDT | Severe Thunderstorm Warning | PHI | 48 min |
| Aug 22, 10:37 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 22, 10:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Aug 22, 11:42 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Aug 23, 3:37 AM EDT | Areal Flood Warning | PHI | 4 hr |
| Aug 29, 2:14 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Sep 5, 3:26 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 5, 6:26 PM EDT | Severe Thunderstorm Warning | PHI | 49 min |
| Sep 5, 7:18 PM EDT | Special Weather Statement | PHI | 27 min |
| Sep 8, 6:53 PM EDT | Special Weather Statement | PHI | 67 min |
| Oct 15, 3:22 PM EDT | Frost Advisory | PHI | 42 hr |
| Oct 23, 3:04 PM EDT | Wind Advisory | PHI | 24 hr |
| Oct 24, 8:00 AM EDT | Special Weather Statement | PHI | 30 min |
| Oct 24, 10:51 AM EDT | Special Weather Statement | PHI | 39 min |
| Oct 24, 11:11 AM EDT | Special Weather Statement | PHI | 34 min |
| Oct 24, 11:26 AM EDT | Special Weather Statement | PHI | 34 min |
| 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, 6:11 PM EDT | Areal Flood Advisory | PHI | 5 hr |
| Oct 29, 7:55 PM EDT | Areal Flood Warning | PHI | 10 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 13, 3:28 PM EST | Winter Weather Advisory | PHI | 16 hr |
| Dec 24, 3:18 AM EST | Wind Advisory | PHI | 35 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 | 18 |
| Severe Thunderstorm Watch | 10 |
| Mesoscale Discussion | 28 |
| Special Weather Statement | 30 |
| Flooding | |
| Areal Flood Warning | 8 |
| Flash Flood Warning | 3 |
| River Flood Warning | 1 |
| Flash Flood Watch | 4 |
| Flood Watch | 4 |
| Areal Flood Advisory | 27 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 7 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Frost Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 7 |
| 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 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.