Alert archive / Pennsylvania / Lehigh County
Weather alerts in Lehigh County, Pennsylvania, 2025
137 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Lehigh County and its neighbors
Each county as a circle sized by its count in 2025. Tap one for its archive.
- Alerts
- 137
- Warnings
- 49
- Watches
- 27
- Advisories
- 34
- Busiest month
- July42 alerts
- Busiest day
- July 3, 20258 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Lehigh County, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 29 | 20 | 31% | 7 | 100% | 39 min |
| Flash flood warnings | 8 | 6 | 25% | 3 | 100% | 94 min |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Philadelphia/Mount Holly: tornado warnings | 29 | 1 | 97% | 5 | 20% | 0 min |
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 233 | 131 | 44% | 502 | 91% | 23 min |
| NWS Philadelphia/Mount Holly: flash flood warnings | 96 | 55 | 43% | 203 | 96% | 67 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 17, 3:04 PM EST | Winter Storm Watch | PHI | 24 hr |
| Jan 18, 2:49 PM EST | Winter Storm Warning | PHI | 33 hr |
| Jan 19, 1:00 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 19, 3:51 PM EST | Cold Weather Advisory | PHI | 68 hr |
| Jan 19, 4:34 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Jan 28, 1:18 PM EST | Wind Advisory | PHI | 29 hr |
| Jan 30, 3:14 AM EST | Winter Weather Advisory | PHI | 30 hr |
| Feb 4, 2:06 PM EST | Winter Weather Advisory | PHI | 48 hr |
| Feb 6, 4:00 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 6, 9:12 PM EST | Dense Fog Advisory | PHI | 5 hr |
| Feb 7, 1:01 PM EST | Winter Weather Advisory | PHI | 38 hr |
| Feb 8, 6:24 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 11, 3:30 PM EST | Winter Weather Advisory | PHI | 45 hr |
| Feb 13, 4:35 PM EST | Wind Advisory | PHI | 5 hr |
| Feb 14, 3:22 AM EST | Special Weather Statement | PHI | 23 min |
| Feb 14, 3:30 AM EST | Winter Weather Advisory | PHI | 57 hr |
| Feb 14, 3:46 AM EST | Special Weather Statement | PHI | 29 min |
| Feb 14, 3:55 AM EST | Snow Squall Warning | PHI | 35 min |
| Feb 14, 4:28 AM EST | Snow Squall Warning | PHI | 47 min |
| Feb 15, 2:57 AM EST | High Wind Watch | PHI | 11 hr |
| Feb 15, 2:17 PM EST | High Wind Warning | PHI | 49 hr |
| Feb 17, 2:41 AM EST | Wind Advisory | PHI | 12 hr |
| Mar 1, 4:28 PM EST | Wind Advisory | PHI | 5 hr |
| Mar 6, 1:38 AM EST | Wind Advisory | PHI | 38 hr |
| Mar 16, 10:03 AM EDT | Wind Advisory | PHI | 13 hr |
| Mar 31, 3:33 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Apr 15, 1:09 PM EDT | Wind Advisory | PHI | 7 hr |
| Apr 15, 3:07 PM EDT | Severe Thunderstorm Warning | PHI | 53 min |
| Apr 15, 3:56 PM EDT | Severe Thunderstorm Warning | PHI | 49 min |
| Apr 29, 8:15 PM EDT | Severe Thunderstorm Warning | PHI | 45 min |
| May 3, 5:51 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 3, 8:47 PM EDT | Severe Thunderstorm Warning | PHI | 43 min |
| May 6, 12:01 PM EDT | Mesoscale Discussion | SPC | 119 min |
| May 6, 1:06 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 6, 2:12 PM EDT | Severe Thunderstorm Warning | PHI | 48 min |
| May 6, 2:43 PM EDT | Mesoscale Discussion | SPC | 92 min |
| May 6, 2:46 PM EDT | Severe Thunderstorm Warning | PHI | 59 min |
| May 6, 4:37 PM EDT | Mesoscale Discussion | SPC | 83 min |
| May 6, 4:44 PM EDT | Severe Thunderstorm Warning | PHI | 46 min |
| May 15, 9:34 PM EDT | Dense Fog Advisory | PHI | 12 hr |
| May 16, 10:06 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 16, 10:24 AM EDT | Severe Thunderstorm Warning | PHI | 66 min |
| May 16, 4:36 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 30, 2:13 AM EDT | Flood Watch | PHI | 28 hr |
| May 31, 1:04 AM EDT | Flash Flood Warning | PHI | 4 hr |
| May 31, 5:06 AM EDT | Areal Flood Warning | PHI | 5 hr |
| May 31, 8:42 AM EDT | Areal Flood Warning | PHI | 4 hr |
| Jun 6, 1:32 PM EDT | Flood Watch | PHI | 6 hr |
| Jun 6, 4:45 PM EDT | Flash Flood Warning | PHI | 3 hr |
| Jun 12, 4:57 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 19, 1:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 19, 1:46 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 20, 2:12 AM EDT | Extreme Heat Watch | PHI | 24 hr |
| Jun 21, 2:06 AM EDT | Extreme Heat Warning | PHI | 5 days |
| Jun 25, 5:39 PM EDT | Severe Thunderstorm Warning | PHI | 66 min |
| Jun 26, 12:24 PM EDT | Flood Watch | PHI | 11 hr |
| Jun 26, 1:54 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 2:20 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 26, 3:48 PM EDT | Severe Thunderstorm Warning | PHI | 42 min |
| Jun 26, 4:20 PM EDT | Severe Thunderstorm Warning | PHI | 40 min |
| Jun 26, 4:31 PM EDT | Severe Thunderstorm Warning | PHI | 44 min |
| Jun 28, 10:51 AM EDT | Mesoscale Discussion | SPC | 114 min |
| Jun 28, 4:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 30, 12:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jul 1, 12:59 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 1, 4:27 PM EDT | Severe Thunderstorm Warning | PHI | 63 min |
| Jul 1, 5:07 PM EDT | Severe Thunderstorm Warning | PHI | 38 min |
| Jul 1, 5:14 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 1, 8:55 PM EDT | Areal Flood Warning | PHI | 6 hr |
| Jul 3, 1:30 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 3, 2:38 PM EDT | Severe Thunderstorm Warning | PHI | 21 min |
| Jul 3, 3:23 PM EDT | Severe Thunderstorm Warning | PHI | 26 min |
| Jul 3, 4:41 PM EDT | Severe Thunderstorm Warning | PHI | 49 min |
| Jul 3, 5:27 PM EDT | Severe Thunderstorm Warning | PHI | 48 min |
| Jul 3, 5:56 PM EDT | Severe Thunderstorm Warning | PHI | 49 min |
| Jul 3, 6:11 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 3, 6:39 PM EDT | Severe Thunderstorm Warning | PHI | 34 min |
| Jul 7, 10:59 PM EDT | Flood Watch | PHI | 23 hr |
| Jul 8, 12:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 8, 1:42 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 8, 3:32 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 8, 6:46 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jul 8, 9:52 PM EDT | Flood Watch | PHI | 26 hr |
| Jul 9, 5:31 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 13, 1:44 PM EDT | Flood Watch | PHI | 32 hr |
| Jul 14, 2:20 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 3:42 PM EDT | Severe Thunderstorm Warning | PHI | 9 min |
| Jul 14, 4:49 PM EDT | Flash Flood Warning | PHI | 3 hr |
| Jul 14, 5:25 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 14, 5:32 PM EDT | Flash Flood Warning | PHI | 6 hr |
| Jul 14, 10:45 PM EDT | Areal Flood Warning | PHI | 4 hr |
| Jul 15, 2:37 PM EDT | Flood Watch | PHI | 34 hr |
| Jul 16, 1:55 AM EDT | Heat Advisory | PHI | 42 hr |
| Jul 23, 1:41 PM EDT | Heat Advisory | PHI | 55 hr |
| Jul 25, 1:05 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jul 25, 1:41 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 25, 3:36 PM EDT | Severe Thunderstorm Warning | PHI | 54 min |
| Jul 25, 4:25 PM EDT | Severe Thunderstorm Warning | PHI | 65 min |
| Jul 25, 6:46 PM EDT | Severe Thunderstorm Warning | PHI | 27 min |
| Jul 25, 7:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 28, 3:00 AM EDT | Heat Advisory | PHI | 65 hr |
| Jul 30, 2:10 PM EDT | Flood Watch | PHI | 31 hr |
| Jul 31, 11:29 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 31, 12:11 PM EDT | Severe Thunderstorm Warning | PHI | 64 min |
| Jul 31, 1:15 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 31, 2:03 PM EDT | Flash Flood Warning | PHI | 2 hr |
| Aug 13, 4:49 PM EDT | Severe Thunderstorm Warning | PHI | 41 min |
| Aug 17, 3:25 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 4, 10:26 PM EDT | Areal Flood Warning | PHI | 4 hr |
| Sep 6, 11:56 AM EDT | Mesoscale Discussion | SPC | 94 min |
| Sep 6, 1:13 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 24, 6:13 AM EDT | Dense Fog Advisory | PHI | 3 hr |
| Sep 25, 3:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Sep 26, 3:37 AM EDT | Dense Fog Advisory | PHI | 5 hr |
| Oct 8, 2:23 AM EDT | Freeze Watch | PHI | 24 hr |
| Oct 9, 1:56 AM EDT | Frost Advisory | PHI | 31 hr |
| Oct 9, 1:56 AM EDT | Freeze Warning | PHI | 31 hr |
| Oct 30, 2:52 PM EDT | Wind Advisory | PHI | 30 hr |
| Nov 4, 1:03 PM EST | High Wind Watch | PHI | 13 hr |
| Nov 5, 2:18 AM EST | Wind Advisory | PHI | 26 hr |
| Nov 5, 10:05 PM EST | Severe Thunderstorm Warning | PHI | 40 min |
| Nov 15, 7:05 PM EST | Wind Advisory | PHI | 24 hr |
| Nov 25, 10:49 PM EST | Dense Fog Advisory | PHI | 11 hr |
| Dec 1, 1:28 AM EST | Winter Weather Advisory | PHI | 39 hr |
| Dec 2, 9:51 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Dec 9, 2:20 AM EST | Winter Weather Advisory | PHI | 40 hr |
| Dec 12, 1:37 PM EST | Winter Weather Advisory | PHI | 47 hr |
| Dec 17, 2:07 PM EST | Wind Advisory | PHI | 59 hr |
| Dec 19, 1:40 PM EST | Severe Thunderstorm Warning | PHI | 65 min |
| Dec 19, 2:41 PM EST | Severe Thunderstorm Warning | PHI | 64 min |
| Dec 19, 4:34 PM EST | High Wind Warning | PHI | 5 hr |
| Dec 22, 12:34 PM EST | Winter Weather Advisory | PHI | 25 hr |
| Dec 24, 1:11 PM EST | Winter Storm Watch | PHI | 24 hr |
| Dec 25, 1:14 PM EST | Winter Weather Advisory | PHI | 45 hr |
| Dec 27, 1:20 PM EST | Winter Weather Advisory | PHI | 37 hr |
| Dec 28, 1:25 PM EST | Wind Advisory | PHI | 51 hr |
| Dec 28, 9:32 PM EST | Dense Fog Advisory | PHI | 14 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 | 29 |
| Severe Thunderstorm Watch | 13 |
| Mesoscale Discussion | 25 |
| Special Weather Statement | 2 |
| Flooding | |
| Areal Flood Warning | 5 |
| Flash Flood Warning | 8 |
| Flood Watch | 8 |
| Winter | |
| Snow Squall Warning | 2 |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 11 |
| Heat | |
| Extreme Heat Warning | 1 |
| Extreme Heat Watch | 1 |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Cold Weather Advisory | 1 |
| Frost Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 2 |
| Wind Advisory | 12 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20242026
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.