Alert archive / New Jersey / Morris County
Weather alerts in Morris County, New Jersey, 2023
209 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Morris County and its neighbors
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Alerts
- 209
- Warnings
- 83
- Watches
- 28
- Advisories
- 39
- Busiest month
- July62 alerts
- Busiest day
- June 26, 202315 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 4 tornado warnings covering Morris County in 2023 had a tornado report inside them.
Morris County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 33 | 19 | 42% | 32 | 66% | 18 min |
| Flash flood warnings | 8 | 4 | 50% | 3 | 67% | 63 min |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Philadelphia/Mount Holly: tornado warnings | 35 | 7 | 80% | 24 | 46% | 6 min |
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 364 | 198 | 46% | 662 | 84% | 22 min |
| NWS Philadelphia/Mount Holly: flash flood warnings | 91 | 49 | 46% | 139 | 91% | 106 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 3, 6:54 PM EST | Dense Fog Advisory | PHI | 16 hr |
| Jan 24, 4:04 AM EST | Winter Weather Advisory | PHI | 39 hr |
| Jan 27, 8:28 AM EST | River Flood Warning | PHI | 31 hr |
| Feb 21, 4:52 PM EST | Special Weather Statement | PHI | 23 min |
| Feb 26, 2:58 PM EST | Winter Weather Advisory | PHI | 42 hr |
| Feb 27, 3:50 AM EST | Winter Storm Warning | PHI | 29 hr |
| Mar 2, 6:15 AM EST | Dense Fog Advisory | PHI | 4 hr |
| Mar 9, 3:16 AM EST | Winter Weather Advisory | PHI | 55 hr |
| Mar 13, 3:17 AM EDT | Winter Storm Warning | PHI | 42 hr |
| Mar 13, 8:30 PM EDT | Winter Weather Advisory | PHI | 25 hr |
| Mar 18, 7:34 PM EDT | Red Flag Warning | PHI | 24 hr |
| Mar 29, 10:51 PM EDT | Special Weather Statement | PHI | 24 min |
| Apr 1, 4:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Apr 1, 5:30 PM EDT | Tornado Watch | SPC | 5 hr |
| Apr 1, 5:53 PM EDT | Severe Thunderstorm Warning | PHI | 67 min |
| Apr 1, 6:18 PM EDT | Special Weather Statement | PHI | 42 min |
| Apr 1, 6:31 PM EDT | Severe Thunderstorm Warning | PHI | 44 min |
| Apr 15, 3:28 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Apr 19, 3:43 AM EDT | Red Flag Warning | PHI | 16 hr |
| Apr 22, 2:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Apr 22, 6:11 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Apr 22, 7:15 PM EDT | Special Weather Statement | PHI | 30 min |
| Apr 22, 7:24 PM EDT | Severe Thunderstorm Warning | PHI | 16 min |
| Apr 22, 7:52 PM EDT | Special Weather Statement | PHI | 53 min |
| Apr 22, 8:07 PM EDT | Severe Thunderstorm Warning | PHI | 23 min |
| Apr 22, 8:29 PM EDT | Severe Thunderstorm Warning | PHI | 19 min |
| Apr 29, 3:46 PM EDT | Flood Watch | PHI | 30 hr |
| Apr 30, 10:31 PM EDT | River Flood Warning | PHI | 24 hr |
| Apr 30, 10:37 PM EDT | River Flood Warning | PHI | 6 days |
| Apr 30, 11:03 PM EDT | Areal Flood Advisory | PHI | 117 min |
| Apr 30, 11:11 PM EDT | River Flood Warning | PHI | 32 hr |
| May 1, 12:28 AM EDT | River Flood Warning | PHI | 48 hr |
| May 1, 12:47 AM EDT | Areal Flood Warning | PHI | 10 hr |
| May 1, 3:47 AM EDT | River Flood Warning | PHI | 4 days |
| May 1, 5:16 PM EDT | Special Weather Statement | PHI | 44 min |
| May 17, 11:20 AM EDT | Frost Advisory | PHI | 21 hr |
| Jun 5, 3:23 PM EDT | Fire Weather Watch | PHI | 12 hr |
| Jun 6, 3:49 AM EDT | Red Flag Warning | PHI | 16 hr |
| Jun 6, 1:10 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 6, 2:06 PM EDT | Special Weather Statement | PHI | 24 min |
| Jun 12, 12:30 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jun 14, 12:06 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 5:26 PM EDT | Special Weather Statement | PHI | 34 min |
| Jun 25, 6:31 PM EDT | Severe Thunderstorm Warning | PHI | 29 min |
| Jun 25, 6:57 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jun 26, 3:33 AM EDT | Flood Watch | PHI | 23 hr |
| Jun 26, 9:37 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Jun 26, 9:47 AM EDT | Severe Thunderstorm Warning | PHI | 43 min |
| Jun 26, 12:36 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 1:11 PM EDT | Severe Thunderstorm Watch | SPC | 11 hr |
| Jun 26, 2:49 PM EDT | Severe Thunderstorm Warning | PHI | 41 min |
| Jun 26, 3:04 PM EDT | Severe Thunderstorm Warning | PHI | 41 min |
| Jun 26, 3:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 26, 3:40 PM EDT | Severe Thunderstorm Warning | PHI | 50 min |
| Jun 26, 4:16 PM EDT | Areal Flood Advisory | PHI | 101 min |
| Jun 26, 5:01 PM EDT | Areal Flood Advisory | PHI | 56 min |
| Jun 26, 5:09 PM EDT | Severe Thunderstorm Warning | PHI | 39 min |
| Jun 26, 5:55 PM EDT | Flash Flood Warning | PHI | 6 hr |
| Jun 26, 6:16 PM EDT | Areal Flood Advisory | PHI | 51 min |
| Jun 26, 7:07 PM EDT | Flash Flood Warning | PHI | 5 hr |
| Jun 26, 8:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 26, 10:07 PM EDT | Special Weather Statement | PHI | 23 min |
| Jun 26, 10:26 PM EDT | Severe Thunderstorm Warning | PHI | 16 min |
| Jun 26, 10:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jun 27, 12:00 AM EDT | Areal Flood Warning | PHI | 7 hr |
| Jun 27, 3:02 AM EDT | Flood Watch | PHI | 46 min |
| Jun 27, 3:48 AM EDT | Flood Watch | PHI | 17 hr |
| Jun 27, 4:04 AM EDT | River Flood Warning | PHI | 22 hr |
| Jun 27, 11:16 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jun 27, 5:01 PM EDT | Severe Thunderstorm Warning | PHI | 44 min |
| Jun 27, 6:12 PM EDT | Special Weather Statement | PHI | 33 min |
| Jun 27, 6:46 PM EDT | Severe Thunderstorm Warning | PHI | 44 min |
| Jun 27, 6:52 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jun 28, 2:17 AM EDT | River Flood Warning | PHI | 7 hr |
| Jul 2, 4:31 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 2, 8:09 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 2, 11:13 PM EDT | Severe Thunderstorm Warning | PHI | 32 min |
| Jul 2, 11:24 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Jul 3, 1:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jul 3, 2:21 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 3, 4:22 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Jul 3, 8:50 PM EDT | Areal Flood Advisory | PHI | 115 min |
| Jul 3, 9:22 PM EDT | Areal Flood Advisory | PHI | 83 min |
| Jul 4, 3:09 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Jul 4, 3:45 PM EDT | Severe Thunderstorm Warning | PHI | 45 min |
| Jul 4, 4:26 PM EDT | Severe Thunderstorm Warning | PHI | 23 min |
| Jul 8, 3:17 PM EDT | Flood Watch | PHI | 31 hr |
| Jul 9, 10:28 AM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 9, 11:06 AM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 9, 1:20 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jul 9, 1:57 PM EDT | Areal Flood Advisory | PHI | 65 min |
| Jul 9, 2:30 PM EDT | Areal Flood Advisory | PHI | 4 min |
| Jul 9, 2:34 PM EDT | Flash Flood Warning | PHI | 6 hr |
| Jul 9, 3:00 PM EDT | Flash Flood Warning | PHI | 6 hr |
| Jul 9, 6:52 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 9, 8:20 PM EDT | Areal Flood Warning | PHI | 9 hr |
| Jul 9, 9:00 PM EDT | Areal Flood Warning | PHI | 11 hr |
| Jul 9, 10:01 PM EDT | River Flood Warning | PHI | 31 hr |
| Jul 14, 6:20 AM EDT | Severe Thunderstorm Warning | PHI | 40 min |
| Jul 14, 6:55 AM EDT | Severe Thunderstorm Warning | PHI | 50 min |
| Jul 14, 7:27 AM EDT | Severe Thunderstorm Warning | PHI | 18 min |
| Jul 14, 2:02 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 6:06 PM EDT | Special Weather Statement | PHI | 24 min |
| Jul 14, 7:40 PM EDT | Flash Flood Warning | PHI | 6 hr |
| Jul 14, 8:05 PM EDT | Special Weather Statement | PHI | 40 min |
| Jul 14, 8:29 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 14, 9:13 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jul 14, 9:51 PM EDT | Special Weather Statement | PHI | 24 min |
| Jul 14, 9:57 PM EDT | Severe Thunderstorm Warning | PHI | 41 min |
| Jul 15, 3:44 AM EDT | Flood Watch | PHI | 38 hr |
| Jul 15, 5:45 PM EDT | Severe Thunderstorm Warning | PHI | 45 min |
| Jul 16, 5:07 AM EDT | Tornado Warning | PHI | 38 min |
| Jul 16, 5:26 AM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 16, 5:31 AM EDT | Tornado Warning | PHI | 29 min |
| Jul 16, 5:58 AM EDT | Tornado Warning | PHI | 32 min |
| Jul 17, 12:52 AM EDT | Dense Fog Advisory | PHI | 10 hr |
| Jul 20, 10:28 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 21, 4:56 AM EDT | Special Weather Statement | PHI | 34 min |
| Jul 25, 10:58 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 25, 12:13 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jul 25, 2:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 25, 2:06 PM EDT | Severe Thunderstorm Warning | PHI | 39 min |
| Jul 25, 2:39 PM EDT | Severe Thunderstorm Warning | PHI | 51 min |
| Jul 25, 2:44 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Jul 26, 3:32 AM EDT | Heat Advisory | PHI | 4 days |
| Jul 27, 11:40 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 27, 3:18 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 27, 4:46 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 27, 6:07 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 27, 6:17 PM EDT | Severe Thunderstorm Warning | PHI | 43 min |
| Jul 27, 6:52 PM EDT | Special Weather Statement | PHI | 23 min |
| Jul 27, 8:04 PM EDT | Special Weather Statement | PHI | 26 min |
| Jul 29, 1:56 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jul 29, 2:48 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 29, 4:45 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 29, 6:13 PM EDT | Special Weather Statement | PHI | 32 min |
| Aug 4, 6:13 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 2:31 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Aug 7, 3:13 PM EDT | Tornado Watch | SPC | 8 hr |
| Aug 7, 5:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 7, 6:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Aug 7, 8:18 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Aug 12, 5:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 6:07 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 12, 9:02 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Aug 13, 1:41 AM EDT | Severe Thunderstorm Warning | PHI | 33 min |
| Aug 13, 1:49 AM EDT | Tornado Warning | PHI | 26 min |
| Aug 14, 3:40 PM EDT | Flood Watch | PHI | 13 hr |
| Aug 15, 1:28 AM EDT | Special Weather Statement | PHI | 32 min |
| Aug 18, 4:45 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 25, 5:04 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 25, 6:08 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 4, 2:41 PM EDT | Heat Advisory | PHI | 3 days |
| Sep 7, 11:58 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 7, 1:14 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Sep 7, 6:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Sep 7, 6:30 PM EDT | Severe Thunderstorm Warning | PHI | 45 min |
| Sep 7, 7:05 PM EDT | Special Weather Statement | PHI | 25 min |
| Sep 7, 7:11 PM EDT | Severe Thunderstorm Warning | PHI | 34 min |
| Sep 7, 7:51 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Sep 8, 2:46 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Sep 8, 3:11 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Sep 8, 3:36 PM EDT | Severe Thunderstorm Warning | PHI | 30 min |
| Sep 8, 4:50 PM EDT | Severe Thunderstorm Warning | PHI | 40 min |
| Sep 8, 4:52 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Sep 8, 6:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Sep 9, 2:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 9, 3:40 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Sep 9, 3:47 PM EDT | Severe Thunderstorm Warning | PHI | 43 min |
| Sep 9, 4:08 PM EDT | Severe Thunderstorm Warning | PHI | 53 min |
| Sep 9, 4:23 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 9, 4:37 PM EDT | Severe Thunderstorm Warning | PHI | 53 min |
| Sep 9, 4:42 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 9, 6:06 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Sep 9, 8:08 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 11, 4:43 PM EDT | Areal Flood Advisory | PHI | 108 min |
| Sep 12, 2:39 PM EDT | Flood Watch | PHI | 16 hr |
| Sep 28, 11:15 AM EDT | Flood Watch | PHI | 34 hr |
| Sep 29, 7:40 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 29, 9:08 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Oct 23, 3:28 PM EDT | Frost Advisory | PHI | 18 hr |
| Oct 31, 3:10 AM EDT | Freeze Watch | PHI | 24 hr |
| Nov 1, 3:16 AM EDT | Freeze Warning | PHI | 31 hr |
| Dec 2, 5:05 AM EST | Dense Fog Advisory | PHI | 5 hr |
| Dec 8, 3:26 PM EST | Flood Watch | PHI | 66 hr |
| Dec 15, 3:36 PM EST | Flood Watch | PHI | 69 hr |
| Dec 18, 3:29 AM EST | Areal Flood Advisory | PHI | 5 hr |
| Dec 18, 4:39 AM EST | Areal Flood Warning | PHI | 17 hr |
| Dec 18, 4:46 AM EST | River Flood Warning | PHI | 50 hr |
| Dec 18, 4:55 AM EST | River Flood Warning | PHI | 6 days |
| Dec 18, 5:06 AM EST | Areal Flood Warning | PHI | 31 hr |
| Dec 18, 6:29 AM EST | River Flood Warning | PHI | 4 days |
| Dec 18, 6:38 AM EST | River Flood Warning | PHI | 7 days |
| Dec 18, 6:39 AM EST | River Flood Warning | PHI | 3 days |
| Dec 18, 8:12 AM EST | River Flood Warning | PHI | 44 hr |
| Dec 18, 8:17 AM EST | River Flood Warning | PHI | 39 hr |
| Dec 18, 3:28 PM EST | River Flood Warning | PHI | 10 hr |
| Dec 18, 3:30 PM EST | River Flood Warning | PHI | 53 hr |
| Dec 25, 3:20 PM EST | Dense Fog Advisory | PHI | 21 hr |
| Dec 27, 11:38 AM EST | Flood Watch | PHI | 22 hr |
| Dec 27, 11:29 PM EST | Areal Flood Warning | PHI | 8 hr |
| Dec 28, 12:26 AM EST | Areal Flood Advisory | PHI | 84 min |
| Dec 28, 1:50 AM EST | Areal Flood Warning | PHI | 6 hr |
| Dec 28, 2:48 AM EST | Areal Flood Warning | PHI | 8 hr |
| Dec 28, 4:05 AM EST | River Flood Warning | PHI | 21 days |
| Dec 28, 9:05 AM EST | River Flood Warning | PHI | 5 days |
| Dec 28, 10:48 AM EST | Areal Flood Warning | PHI | 3 hr |
| Dec 28, 11:05 AM EST | River Flood Warning | PHI | 33 hr |
| Dec 28, 11:38 AM EST | River Flood Warning | PHI | 3 days |
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 | 33 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 12 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 40 |
| Special Weather Statement | 19 |
| Flooding | |
| Areal Flood Warning | 10 |
| Flash Flood Warning | 8 |
| River Flood Warning | 22 |
| Flood Watch | 12 |
| Areal Flood Advisory | 26 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Weather Advisory | 4 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20222024
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.