Alert archive / Pennsylvania / Northampton County
Weather alerts in Northampton County, Pennsylvania, 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.
Northampton County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 182
- Warnings
- 38
- Watches
- 20
- Advisories
- 65
- Busiest month
- July45 alerts
- Busiest day
- June 19, 201711 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 1 tornado warnings covering Northampton County in 2017 had a tornado report inside them.
Northampton County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 27 | 22 | 19% | 26 | 92% | 23 min |
| Flash flood warnings | 2 | 1 | 50% | 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 9, 2:55 PM EST | Winter Weather Advisory | PHI | 36 hr |
| Jan 10, 9:48 PM EST | Special Weather Statement | PHI | 3 hr |
| Jan 16, 11:36 AM EST | Freezing Rain Advisory | PHI | 43 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, 3:44 AM EST | Wind Advisory | PHI | 38 hr |
| Feb 6, 3:39 AM EST | Freezing Rain Advisory | PHI | 33 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 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, 3:19 PM EST | Severe Thunderstorm Warning | PHI | 41 min |
| Feb 25, 4:17 PM EST | Severe Thunderstorm Warning | PHI | 43 min |
| Feb 25, 4:44 PM EST | Mesoscale Discussion | SPC | 91 min |
| Mar 1, 2:09 PM EST | Severe Thunderstorm Warning | PHI | 51 min |
| Mar 1, 2:31 PM EST | Special Weather Statement | PHI | 29 min |
| 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, 3:18 PM EST | Special Weather Statement | PHI | 57 min |
| Mar 3, 4:08 PM EST | Special Weather Statement | PHI | 37 min |
| Mar 9, 3:35 AM EST | Winter Weather Advisory | PHI | 34 hr |
| Mar 10, 8:23 AM EST | Special Weather Statement | PHI | 82 min |
| Mar 10, 2:21 PM EST | Special Weather Statement | PHI | 24 min |
| Mar 10, 2:44 PM EST | Special Weather Statement | PHI | 31 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 13, 10:01 PM EDT | Mesoscale Discussion | SPC | 4 hr |
| Mar 14, 3:22 AM EDT | Mesoscale Discussion | SPC | 5 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 17, 3:46 PM EDT | Winter Weather Advisory | PHI | 20 hr |
| Mar 31, 3:41 AM EDT | Flood Watch | PHI | 20 hr |
| Apr 2, 3:24 PM EDT | Flood Watch | PHI | 36 hr |
| Apr 4, 3:09 PM EDT | Flood Watch | PHI | 54 hr |
| Apr 6, 11:58 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Apr 6, 4:02 PM EDT | Areal Flood Advisory | PHI | 6 hr |
| Apr 6, 4:26 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Apr 29, 3:20 AM EDT | Special Weather Statement | PHI | 40 min |
| May 1, 7:16 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 3, 2:58 PM EDT | Frost Advisory | PHI | 17 hr |
| May 8, 3:18 PM EDT | Frost Advisory | PHI | 15 hr |
| May 29, 8:59 AM EDT | Special Weather Statement | PHI | 31 min |
| Jun 18, 3:30 AM EDT | Flash Flood Watch | PHI | 39 hr |
| Jun 19, 10:45 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 19, 11:13 AM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 19, 1:29 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jun 19, 2:20 PM EDT | Special Weather Statement | PHI | 40 min |
| Jun 19, 2:43 PM EDT | Special Weather Statement | PHI | 47 min |
| Jun 19, 2:49 PM EDT | Severe Thunderstorm Warning | PHI | 41 min |
| Jun 19, 2:57 PM EDT | Severe Thunderstorm Warning | PHI | 48 min |
| Jun 19, 3:24 PM EDT | Flash Flood Warning | PHI | 3 hr |
| Jun 19, 3:35 PM EDT | Severe Thunderstorm Warning | PHI | 25 min |
| Jun 19, 3:53 PM EDT | Severe Thunderstorm Warning | PHI | 37 min |
| Jun 19, 3:56 PM EDT | Severe Thunderstorm Warning | PHI | 49 min |
| Jun 21, 2:38 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 21, 3:32 PM EDT | Special Weather Statement | PHI | 28 min |
| 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, 5:15 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jun 23, 6:58 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jun 23, 7:46 PM EDT | Special Weather Statement | PHI | 59 min |
| Jun 23, 8:25 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Jun 23, 8:54 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jun 23, 9:23 PM EDT | Areal Flood Advisory | PHI | 112 min |
| Jun 24, 3:25 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jun 30, 4:51 PM EDT | Special Weather Statement | PHI | 54 min |
| Jun 30, 6:23 PM EDT | Special Weather Statement | PHI | 37 min |
| Jul 1, 12:54 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jul 1, 1:34 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 1, 3:41 PM EDT | Severe Thunderstorm Warning | PHI | 49 min |
| Jul 1, 4:10 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 1, 4:24 PM EDT | Severe Thunderstorm Warning | PHI | 51 min |
| Jul 1, 5:00 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 1, 5:08 PM EDT | Severe Thunderstorm Warning | PHI | 52 min |
| Jul 1, 6:17 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 7, 4:37 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 7, 7:00 AM EDT | Areal Flood Warning | PHI | 6 hr |
| Jul 7, 8:15 AM EDT | Areal Flood Warning | PHI | 4 hr |
| Jul 7, 12:11 PM EDT | Areal Flood Warning | PHI | 4 hr |
| Jul 7, 1:00 PM EDT | Areal Flood Warning | PHI | 4 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, 3:25 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 13, 3:30 PM EDT | Special Weather Statement | PHI | 45 min |
| Jul 13, 4:06 PM EDT | Areal Flood Advisory | PHI | 114 min |
| Jul 13, 4:06 PM EDT | Special Weather Statement | PHI | 39 min |
| Jul 13, 4:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 14, 7:21 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jul 14, 12:30 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 17, 12:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 3:56 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 17, 4:24 PM EDT | Special Weather Statement | PHI | 51 min |
| Jul 17, 4:35 PM EDT | Areal Flood Advisory | PHI | 115 min |
| Jul 17, 6:58 PM EDT | Mesoscale Discussion | SPC | 62 min |
| 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, 6:22 PM EDT | Severe Thunderstorm Warning | PHI | 53 min |
| Jul 20, 6:24 PM EDT | Severe Thunderstorm Warning | PHI | 66 min |
| Jul 20, 7:00 PM EDT | Severe Thunderstorm Warning | PHI | 60 min |
| Jul 20, 7:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 22, 6:46 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 23, 3:16 PM EDT | Flash Flood Watch | PHI | 15 hr |
| Jul 24, 3:17 AM EDT | Areal Flood Advisory | PHI | 118 min |
| Jul 24, 3:36 AM EDT | Areal Flood Advisory | PHI | 6 hr |
| Jul 24, 3:47 AM EDT | Areal Flood Advisory | PHI | 118 min |
| Jul 24, 2:17 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 24, 6:43 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 24, 7:07 PM EDT | Areal Flood Advisory | PHI | 113 min |
| Jul 24, 7:12 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Jul 28, 5:49 AM EDT | Dense Fog Advisory | PHI | 3 hr |
| Aug 1, 3:15 PM EDT | Special Weather Statement | PHI | 45 min |
| Aug 1, 3:31 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 1, 5:58 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 2, 1:30 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 2:45 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 2, 2:48 PM EDT | Severe Thunderstorm Warning | PHI | 27 min |
| Aug 2, 3:04 PM EDT | Severe Thunderstorm Warning | PHI | 41 min |
| Aug 3, 6:28 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Aug 3, 8:29 PM EDT | Severe Thunderstorm Warning | PHI | 46 min |
| Aug 3, 8:35 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 3, 9:20 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 3, 9:29 PM EDT | Special Weather Statement | PHI | 46 min |
| Aug 5, 1:42 AM EDT | Special Weather Statement | PHI | 48 min |
| Aug 11, 10:49 PM EDT | Special Weather Statement | PHI | 41 min |
| Aug 11, 11:05 PM EDT | Areal Flood Advisory | PHI | 5 hr |
| Aug 12, 2:44 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 12, 5:17 PM EDT | Mesoscale Discussion | SPC | 88 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, 4:48 AM EDT | Areal Flood Advisory | PHI | 4 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, 3:19 PM EDT | Special Weather Statement | PHI | 26 min |
| Aug 18, 3:45 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 18, 3:46 PM EDT | Severe Thunderstorm Warning | PHI | 44 min |
| Aug 18, 4:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Aug 19, 8:16 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Aug 19, 9:00 PM EDT | Severe Thunderstorm Warning | PHI | 60 min |
| 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, 7:33 PM EDT | Severe Thunderstorm Warning | PHI | 42 min |
| Aug 22, 8:12 PM EDT | Severe Thunderstorm Warning | PHI | 48 min |
| Aug 22, 8:15 PM EDT | Tornado Warning | PHI | 30 min |
| Aug 22, 8:45 PM EDT | Severe Thunderstorm Warning | PHI | 60 min |
| Aug 22, 8:58 PM EDT | Severe Thunderstorm Warning | PHI | 24 min |
| Aug 22, 10:37 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Sep 5, 3:26 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 5, 4:08 PM EDT | Severe Thunderstorm Warning | PHI | 52 min |
| Sep 5, 4:54 PM EDT | Severe Thunderstorm Warning | PHI | 51 min |
| Sep 5, 5:00 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Sep 5, 5:22 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Sep 5, 5:49 PM EDT | Severe Thunderstorm Warning | PHI | 41 min |
| Sep 5, 6:03 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 5, 6:26 PM EDT | Severe Thunderstorm Warning | PHI | 49 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, 8:28 AM EDT | Special Weather Statement | PHI | 32 min |
| Oct 24, 8:58 AM EDT | Special Weather Statement | PHI | 32 min |
| Oct 24, 9:27 AM EDT | Special Weather Statement | PHI | 33 min |
| Oct 24, 10:00 AM EDT | Special Weather Statement | PHI | 30 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, 8:30 PM EDT | Areal Flood Advisory | PHI | 6 hr |
| Nov 12, 8:03 PM EST | Winter Weather Advisory | PHI | 9 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 |
| Dec 24, 3:35 AM EST | Winter Weather Advisory | PHI | 29 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 | 27 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 10 |
| Mesoscale Discussion | 31 |
| Special Weather Statement | 28 |
| Flooding | |
| Areal Flood Warning | 4 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 4 |
| Flood Watch | 3 |
| Areal Flood Advisory | 36 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Freezing Rain Advisory | 3 |
| Winter Weather Advisory | 9 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Frost Advisory | 4 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 7 |
| 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 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.