Alert archive / Pennsylvania / Northampton County
Weather alerts in Northampton County, Pennsylvania, 2018
200 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 200
- Warnings
- 43
- Watches
- 28
- Advisories
- 73
- Busiest month
- August42 alerts
- Busiest day
- November 3, 201811 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 3 tornado warnings covering Northampton County in 2018 had a tornado report inside them.
Northampton County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 1 | 67% | 0 | ||
| Severe thunderstorm warnings | 12 | 11 | 8% | 23 | 96% | 24 min |
| Flash flood warnings | 7 | 6 | 14% | 3 | 100% | 100 min |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Philadelphia/Mount Holly: tornado warnings | 10 | 2 | 80% | 4 | 50% | 6 min |
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 110 | 56 | 49% | 277 | 81% | 27 min |
| NWS Philadelphia/Mount Holly: flash flood warnings | 113 | 54 | 52% | 174 | 94% | 92 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, 4:03 AM EST | Winter Weather Advisory | PHI | 38 hr |
| Jan 4, 3:48 AM EST | Wind Chill Advisory | PHI | 3 days |
| Jan 11, 3:48 PM EST | Winter Weather Advisory | PHI | 39 hr |
| Jan 13, 12:56 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 15, 3:13 PM EST | Winter Weather Advisory | PHI | 44 hr |
| Jan 23, 5:35 AM EST | Areal Flood Advisory | PHI | 4 hr |
| Jan 23, 10:42 AM EST | Special Weather Statement | PHI | 48 min |
| Jan 24, 2:52 PM EST | Flood Watch | PHI | 4 days |
| Feb 3, 3:11 PM EST | Winter Weather Advisory | PHI | 30 hr |
| Feb 4, 6:32 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 6, 3:37 PM EST | Winter Weather Advisory | PHI | 27 hr |
| Feb 10, 3:20 AM EST | Flood Watch | PHI | 39 hr |
| Feb 10, 11:01 PM EST | Dense Fog Advisory | PHI | 8 hr |
| Feb 11, 10:38 AM EST | Areal Flood Advisory | PHI | 14 hr |
| Feb 11, 10:51 AM EST | Areal Flood Advisory | PHI | 8 hr |
| Feb 11, 6:47 PM EST | Dense Fog Advisory | PHI | 8 hr |
| Feb 16, 3:51 AM EST | Winter Storm Watch | PHI | 24 hr |
| Feb 17, 3:45 AM EST | Winter Weather Advisory | PHI | 20 hr |
| Feb 17, 6:32 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 17, 7:41 PM EST | Winter Storm Warning | PHI | 4 hr |
| Feb 19, 11:00 PM EST | Dense Fog Advisory | PHI | 11 hr |
| Feb 25, 10:36 PM EST | Dense Fog Advisory | PHI | 7 hr |
| Feb 28, 3:12 PM EST | High Wind Watch | PHI | 24 hr |
| Feb 28, 3:45 PM EST | Flood Watch | PHI | 45 hr |
| Mar 1, 3:30 PM EST | Wind Advisory | PHI | 45 hr |
| Mar 1, 3:41 PM EST | Winter Weather Advisory | PHI | 30 hr |
| Mar 2, 12:43 AM EST | Areal Flood Advisory | PHI | 4 hr |
| Mar 2, 4:37 AM EST | Areal Flood Advisory | PHI | 3 hr |
| Mar 5, 3:34 AM EST | Winter Storm Watch | PHI | 36 hr |
| Mar 6, 3:37 AM EST | Winter Storm Warning | PHI | 41 hr |
| Mar 7, 8:47 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Mar 7, 1:25 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Mar 12, 3:18 AM EDT | Winter Weather Advisory | PHI | 32 hr |
| Mar 15, 7:40 PM EDT | Special Weather Statement | PHI | 65 min |
| Mar 19, 3:36 PM EDT | Winter Storm Watch | PHI | 13 hr |
| Mar 20, 4:41 AM EDT | Winter Storm Warning | PHI | 47 hr |
| Mar 25, 9:17 AM EDT | Special Weather Statement | PHI | 118 min |
| Apr 1, 4:08 AM EDT | Winter Weather Advisory | PHI | 33 hr |
| Apr 2, 3:47 AM EDT | Mesoscale Discussion | SPC | 6 hr |
| Apr 3, 3:32 PM EDT | Wind Advisory | PHI | 28 hr |
| Apr 4, 12:01 AM EDT | Dense Fog Advisory | PHI | 10 hr |
| Apr 4, 3:44 AM EDT | High Wind Warning | PHI | 16 hr |
| Apr 15, 3:41 PM EDT | Flash Flood Watch | PHI | 20 hr |
| Apr 16, 6:30 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Apr 28, 5:16 AM EDT | Dense Fog Advisory | PHI | 4 hr |
| Apr 28, 3:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 28, 4:40 PM EDT | Special Weather Statement | PHI | 50 min |
| Apr 28, 5:15 PM EDT | Special Weather Statement | PHI | 30 min |
| May 2, 3:42 AM EDT | Red Flag Warning | PHI | 17 hr |
| May 3, 5:18 PM EDT | Special Weather Statement | PHI | 42 min |
| May 3, 5:43 PM EDT | Special Weather Statement | PHI | 32 min |
| May 3, 6:03 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 4, 10:03 PM EDT | Special Weather Statement | PHI | 27 min |
| May 10, 4:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| May 15, 1:46 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 15, 2:49 PM EDT | Special Weather Statement | PHI | 56 min |
| May 15, 3:33 PM EDT | Mesoscale Discussion | SPC | 117 min |
| May 15, 3:46 PM EDT | Severe Thunderstorm Warning | PHI | 74 min |
| May 15, 4:26 PM EDT | Tornado Warning | PHI | 19 min |
| May 15, 4:41 PM EDT | Severe Thunderstorm Warning | PHI | 64 min |
| May 16, 3:35 PM EDT | Flood Watch | PHI | 3 days |
| May 19, 9:27 PM EDT | Dense Fog Advisory | PHI | 9 hr |
| May 26, 11:38 PM EDT | Flash Flood Watch | PHI | 23 hr |
| Jun 13, 10:46 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jun 13, 10:56 PM EDT | Severe Thunderstorm Warning | PHI | 49 min |
| Jun 13, 11:27 PM EDT | Severe Thunderstorm Warning | PHI | 33 min |
| Jun 17, 2:39 PM EDT | Heat Advisory | PHI | 29 hr |
| Jun 18, 5:55 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 18, 6:37 PM EDT | Special Weather Statement | PHI | 53 min |
| Jun 18, 6:48 PM EDT | Severe Thunderstorm Warning | PHI | 57 min |
| Jun 18, 7:30 PM EDT | Severe Thunderstorm Warning | PHI | 60 min |
| Jun 24, 6:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jun 24, 6:50 PM EDT | Special Weather Statement | PHI | 25 min |
| Jun 24, 7:22 PM EDT | Special Weather Statement | PHI | 23 min |
| Jun 28, 4:01 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jun 29, 3:41 PM EDT | Excessive Heat Watch | PHI | 23 hr |
| Jun 29, 3:41 PM EDT | Excessive Heat Warning | PHI | 4 days |
| Jun 29, 3:41 PM EDT | Heat Advisory | PHI | 5 days |
| Jul 3, 7:03 PM EDT | Special Weather Statement | PHI | 57 min |
| Jul 4, 3:09 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 4, 3:22 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 4, 3:32 PM EDT | Special Weather Statement | PHI | 28 min |
| Jul 4, 3:40 PM EDT | Severe Thunderstorm Warning | PHI | 50 min |
| Jul 4, 3:59 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 4, 4:28 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 4, 4:28 PM EDT | Special Weather Statement | PHI | 32 min |
| Jul 4, 7:13 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jul 5, 2:59 PM EDT | Flash Flood Watch | PHI | 20 hr |
| Jul 5, 7:08 PM EDT | Special Weather Statement | PHI | 37 min |
| Jul 15, 8:42 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 15, 9:47 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 17, 11:49 AM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 17, 2:05 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jul 22, 11:18 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jul 23, 3:45 AM EDT | Flash Flood Watch | PHI | 68 hr |
| Jul 23, 2:40 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 24, 12:56 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 24, 4:56 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 24, 1:22 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jul 25, 5:48 PM EDT | Special Weather Statement | PHI | 27 min |
| Jul 25, 6:17 PM EDT | Special Weather Statement | PHI | 43 min |
| Jul 25, 7:04 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 25, 7:09 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 27, 9:50 AM EDT | Flash Flood Watch | PHI | 13 hr |
| Jul 27, 12:59 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jul 27, 1:17 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 27, 4:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 27, 5:27 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 27, 7:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 27, 7:55 PM EDT | Areal Flood Advisory | PHI | 108 min |
| Aug 1, 10:40 PM EDT | Severe Thunderstorm Warning | PHI | 37 min |
| Aug 2, 3:31 AM EDT | Flash Flood Watch | PHI | 55 hr |
| Aug 2, 11:46 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 2, 2:19 PM EDT | Special Weather Statement | PHI | 41 min |
| Aug 3, 3:42 PM EDT | Special Weather Statement | PHI | 63 min |
| Aug 3, 4:45 PM EDT | Special Weather Statement | PHI | 60 min |
| Aug 3, 9:10 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 3, 10:07 PM EDT | Special Weather Statement | PHI | 53 min |
| Aug 3, 10:23 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Aug 4, 2:22 AM EDT | Areal Flood Warning | PHI | 21 hr |
| Aug 4, 2:27 AM EDT | Special Weather Statement | PHI | 63 min |
| Aug 4, 4:41 PM EDT | Severe Thunderstorm Warning | PHI | 34 min |
| Aug 5, 3:05 PM EDT | Heat Advisory | PHI | 27 hr |
| Aug 6, 3:35 PM EDT | Areal Flood Advisory | PHI | 21 min |
| Aug 7, 12:19 PM EDT | Heat Advisory | PHI | 6 hr |
| Aug 11, 3:24 AM EDT | Flash Flood Watch | PHI | 20 hr |
| Aug 11, 5:27 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 11, 6:06 AM EDT | Areal Flood Advisory | PHI | 6 hr |
| Aug 11, 2:00 PM EDT | Flash Flood Warning | PHI | 9 hr |
| Aug 11, 3:06 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Aug 11, 10:28 PM EDT | Areal Flood Warning | PHI | 4 hr |
| Aug 12, 10:08 PM EDT | Flash Flood Watch | PHI | 24 hr |
| Aug 13, 8:43 AM EDT | Flash Flood Warning | PHI | 4 hr |
| Aug 13, 10:40 AM EDT | Areal Flood Advisory | PHI | 42 min |
| Aug 13, 11:21 AM EDT | Areal Flood Warning | PHI | 4 hr |
| Aug 13, 4:57 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 13, 7:27 PM EDT | Areal Flood Warning | PHI | 7 hr |
| Aug 14, 12:50 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 17, 2:42 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 17, 3:44 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 17, 5:36 PM EDT | Special Weather Statement | PHI | 39 min |
| Aug 17, 5:59 PM EDT | Severe Thunderstorm Warning | PHI | 31 min |
| Aug 17, 6:22 PM EDT | Severe Thunderstorm Warning | PHI | 38 min |
| Aug 17, 7:09 PM EDT | Severe Thunderstorm Warning | PHI | 51 min |
| Aug 17, 7:42 PM EDT | Special Weather Statement | PHI | 33 min |
| Aug 18, 3:16 AM EDT | Flash Flood Watch | PHI | 20 hr |
| Aug 21, 10:46 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 21, 11:08 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Aug 21, 11:47 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 22, 2:54 AM EDT | Areal Flood Warning | PHI | 8 hr |
| Aug 27, 2:58 AM EDT | Heat Advisory | PHI | 65 hr |
| Aug 31, 1:22 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Sep 3, 3:02 AM EDT | Heat Advisory | PHI | 4 days |
| Sep 8, 3:34 AM EDT | Flood Watch | PHI | 60 hr |
| Sep 18, 9:27 AM EDT | Flash Flood Watch | PHI | 6 hr |
| Sep 26, 2:48 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 26, 5:02 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 26, 6:15 PM EDT | Special Weather Statement | PHI | 30 min |
| Sep 26, 6:41 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 27, 3:24 AM EDT | Flood Watch | PHI | 27 hr |
| Sep 28, 12:10 AM EDT | Areal Flood Advisory | PHI | 13 hr |
| Oct 2, 2:55 PM EDT | Tornado Watch | SPC | 8 hr |
| Oct 2, 4:43 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 2, 6:58 PM EDT | Tornado Warning | PHI | 47 min |
| Oct 2, 7:24 PM EDT | Mesoscale Discussion | SPC | 81 min |
| Oct 2, 9:05 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Oct 11, 1:43 PM EDT | Areal Flood Advisory | PHI | 7 hr |
| Oct 11, 2:39 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Oct 17, 3:32 PM EDT | Freeze Watch | PHI | 12 hr |
| Oct 18, 3:05 AM EDT | Freeze Warning | PHI | 30 hr |
| Oct 27, 5:37 AM EDT | Special Weather Statement | PHI | 23 min |
| Nov 2, 6:26 PM EDT | Special Weather Statement | PHI | 34 min |
| Nov 2, 8:22 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Nov 2, 9:28 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Nov 2, 10:36 PM EDT | Special Weather Statement | PHI | 24 min |
| Nov 2, 10:45 PM EDT | Areal Flood Warning | PHI | 13 hr |
| Nov 2, 10:47 PM EDT | Tornado Warning | PHI | 43 min |
| Nov 2, 10:53 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Nov 3, 12:20 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Nov 3, 1:29 AM EDT | Areal Flood Advisory | PHI | 4 hr |
| Nov 3, 2:34 AM EDT | Areal Flood Warning | PHI | 15 hr |
| Nov 3, 11:44 AM EDT | Areal Flood Warning | PHI | 8 hr |
| Nov 3, 5:19 PM EDT | Areal Flood Warning | PHI | 22 hr |
| Nov 14, 3:31 PM EST | Winter Weather Advisory | PHI | 29 hr |
| Nov 15, 9:56 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Nov 15, 12:21 PM EST | Winter Storm Warning | PHI | 21 hr |
| Nov 15, 4:39 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Nov 16, 3:56 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Nov 21, 5:28 PM EST | Snow Squall Warning | PHI | 62 min |
| Nov 21, 6:22 PM EST | Special Weather Statement | PHI | 53 min |
| Nov 23, 7:50 PM EST | Winter Weather Advisory | PHI | 20 hr |
| Nov 24, 6:45 PM EST | Areal Flood Advisory | PHI | 6 hr |
| Nov 26, 3:07 PM EST | Areal Flood Advisory | PHI | 3 hr |
| Nov 27, 3:13 PM EST | Wind Advisory | PHI | 27 hr |
| Dec 2, 8:24 AM EST | Dense Fog Advisory | PHI | 21 hr |
| Dec 15, 3:20 PM EST | Winter Weather Advisory | PHI | 30 hr |
| Dec 18, 3:16 PM EST | Flood Watch | PHI | 3 days |
| Dec 21, 4:09 AM EST | Areal Flood Warning | PHI | 16 hr |
| Dec 21, 4:27 AM EST | Areal Flood Warning | PHI | 8 hr |
| Dec 21, 12:15 PM EST | Areal Flood Warning | PHI | 4 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.