Alert archive / Pennsylvania / Chester County
Weather alerts in Chester County, Pennsylvania, 2026
201 weather alerts in 2026, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Chester County and its neighbors
Each county as a circle sized by its count in 2026. Tap one for its archive.
- Alerts
- 201
- Warnings
- 88
- Watches
- 38
- Advisories
- 28
- Busiest month
- July59 alerts
- Busiest day
- July 28, 202612 alerts
Over time
By month
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, 3:00 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 1, 4:00 AM EST | Snow Squall Warning | PHI | 45 min |
| Jan 1, 4:44 AM EST | Snow Squall Warning | PHI | 46 min |
| Jan 7, 12:12 AM EST | Dense Fog Advisory | PHI | 8 hr |
| Jan 16, 1:46 PM EST | Winter Weather Advisory | PHI | 25 hr |
| Jan 17, 2:42 PM EST | Winter Weather Advisory | PHI | 29 hr |
| Jan 17, 8:17 PM EST | Dense Fog Advisory | PHI | 4 hr |
| Jan 19, 3:11 AM EST | Cold Weather Advisory | PHI | 31 hr |
| Jan 22, 2:12 AM EST | Winter Storm Watch | PHI | 34 hr |
| Jan 22, 12:59 PM EST | Cold Weather Advisory | PHI | 47 hr |
| Jan 23, 12:38 PM EST | Winter Storm Warning | PHI | 60 hr |
| Jan 25, 6:01 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 25, 3:02 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 26, 1:16 AM EST | Cold Weather Advisory | PHI | 7 days |
| Feb 5, 12:15 PM EST | Extreme Cold Watch | PHI | 13 hr |
| Feb 6, 1:34 AM EST | Extreme Cold Warning | PHI | 3 days |
| Feb 6, 1:34 AM EST | Wind Advisory | PHI | 48 hr |
| Feb 7, 7:18 AM EST | Snow Squall Warning | PHI | 27 min |
| Feb 7, 7:45 AM EST | Snow Squall Warning | PHI | 30 min |
| Feb 8, 1:59 AM EST | Cold Weather Advisory | PHI | 32 hr |
| Feb 17, 1:15 PM EST | Dense Fog Advisory | PHI | 21 hr |
| Feb 20, 1:50 PM EST | Winter Storm Watch | PHI | 24 hr |
| Feb 21, 3:27 AM EST | Winter Storm Warning | PHI | 58 hr |
| Feb 22, 4:58 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Mar 2, 11:44 AM EST | Winter Weather Advisory | PHI | 34 hr |
| Mar 3, 5:58 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Mar 3, 4:04 PM EST | Dense Fog Advisory | PHI | 6 hr |
| Mar 8, 1:22 AM EST | Dense Fog Advisory | PHI | 9 hr |
| Mar 11, 6:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Mar 11, 7:03 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Mar 15, 12:47 PM EDT | Wind Advisory | PHI | 37 hr |
| Mar 16, 10:57 AM EDT | Mesoscale Discussion | SPC | 93 min |
| Mar 16, 11:30 AM EDT | Tornado Watch | SPC | 6 hr |
| Mar 16, 3:14 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Mar 16, 9:54 PM EDT | Severe Thunderstorm Warning | PHI | 66 min |
| Mar 16, 10:32 PM EDT | Severe Thunderstorm Warning | PHI | 58 min |
| Mar 21, 3:25 AM EDT | Dense Fog Advisory | PHI | 5 hr |
| Apr 6, 12:15 PM EDT | Freeze Watch | PHI | 14 hr |
| Apr 7, 2:19 AM EDT | Freeze Watch | PHI | 31 hr |
| Apr 7, 2:19 AM EDT | Freeze Warning | PHI | 31 hr |
| Apr 8, 8:55 AM EDT | Freeze Warning | PHI | 24 hr |
| Apr 11, 1:54 PM EDT | Frost Advisory | PHI | 18 hr |
| Apr 18, 1:02 PM EDT | Freeze Watch | PHI | 37 hr |
| Apr 20, 2:25 AM EDT | Freeze Warning | PHI | 31 hr |
| Apr 26, 2:38 AM EDT | Frost Advisory | PHI | 29 hr |
| May 2, 12:42 PM EDT | Frost Advisory | PHI | 18 hr |
| May 10, 3:10 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 18, 2:52 AM EDT | Heat Advisory | PHI | 64 hr |
| May 19, 5:40 PM EDT | Mesoscale Discussion | SPC | 65 min |
| May 20, 12:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| May 20, 1:52 PM EDT | Mesoscale Discussion | SPC | 53 min |
| May 20, 2:10 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 20, 3:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| May 20, 4:29 PM EDT | Severe Thunderstorm Warning | PHI | 46 min |
| May 20, 4:50 PM EDT | Severe Thunderstorm Warning | PHI | 40 min |
| May 20, 5:10 PM EDT | Severe Thunderstorm Warning | PHI | 50 min |
| May 20, 5:15 PM EDT | Severe Thunderstorm Warning | PHI | 45 min |
| May 20, 5:29 PM EDT | Severe Thunderstorm Warning | PHI | 46 min |
| May 26, 3:34 AM EDT | Dense Fog Advisory | PHI | 4 hr |
| Jun 6, 4:17 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 6, 4:45 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 6, 6:17 PM EDT | Severe Thunderstorm Warning | PHI | 58 min |
| Jun 6, 6:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jun 10, 2:24 AM EDT | Heat Advisory | PHI | 66 hr |
| Jun 11, 3:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 11, 6:09 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 11, 7:14 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 14, 6:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 14, 7:06 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 14, 9:06 PM EDT | Severe Thunderstorm Warning | PHI | 54 min |
| Jun 14, 9:25 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 9:50 PM EDT | Flash Flood Warning | PHI | 3 hr |
| Jun 14, 9:54 PM EDT | Severe Thunderstorm Warning | PHI | 51 min |
| Jun 14, 10:15 PM EDT | Flash Flood Warning | PHI | 3 hr |
| Jun 14, 10:26 PM EDT | Flash Flood Warning | PHI | 3 hr |
| Jun 14, 10:44 PM EDT | Severe Thunderstorm Warning | PHI | 46 min |
| Jun 22, 2:13 AM EDT | Flood Watch | PHI | 25 hr |
| Jun 22, 1:25 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 2:08 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 22, 4:15 PM EDT | Severe Thunderstorm Warning | PHI | 45 min |
| Jun 22, 4:35 PM EDT | Tornado Warning | PHI | 25 min |
| Jun 22, 4:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 22, 4:56 PM EDT | Tornado Warning | PHI | 34 min |
| Jun 22, 5:22 PM EDT | Severe Thunderstorm Warning | PHI | 53 min |
| Jun 28, 3:57 AM EDT | Extreme Heat Watch | PHI | 71 hr |
| Jun 30, 2:44 AM EDT | Extreme Heat Warning | PHI | 5 days |
| Jul 3, 3:25 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 3, 4:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 4, 3:28 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 4, 6:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 4, 7:44 PM EDT | Severe Thunderstorm Warning | PHI | 61 min |
| Jul 4, 8:19 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 4, 8:25 PM EDT | Severe Thunderstorm Warning | PHI | 65 min |
| Jul 4, 8:38 PM EDT | Severe Thunderstorm Warning | PHI | 52 min |
| Jul 4, 10:52 PM EDT | Heat Advisory | PHI | 21 hr |
| Jul 5, 2:33 AM EDT | Flood Watch | PHI | 41 hr |
| Jul 5, 6:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 5, 6:44 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 5, 8:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 5, 8:58 PM EDT | Severe Thunderstorm Warning | PHI | 77 min |
| Jul 5, 9:57 PM EDT | Severe Thunderstorm Warning | PHI | 63 min |
| Jul 5, 10:05 PM EDT | Severe Thunderstorm Warning | PHI | 40 min |
| Jul 5, 10:37 PM EDT | Severe Thunderstorm Warning | PHI | 38 min |
| Jul 5, 11:00 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 9, 2:09 AM EDT | Flood Watch | PHI | 19 hr |
| Jul 9, 3:20 PM EDT | Flash Flood Warning | PHI | 3 hr |
| Jul 9, 3:38 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 9, 4:30 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 11, 2:46 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 11, 2:56 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 13, 2:45 PM EDT | Heat Advisory | PHI | 53 hr |
| Jul 16, 12:10 AM EDT | Heat Advisory | PHI | 20 hr |
| Jul 16, 3:59 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 1:40 PM EDT | Flood Watch | PHI | 33 hr |
| Jul 18, 12:50 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jul 18, 1:55 PM EDT | Tornado Watch | SPC | 6 hr |
| Jul 18, 3:45 PM EDT | Severe Thunderstorm Warning | PHI | 45 min |
| Jul 18, 4:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 18, 5:45 PM EDT | Severe Thunderstorm Warning | PHI | 45 min |
| Jul 20, 2:44 PM EDT | Flood Watch | PHI | 31 hr |
| Jul 21, 1:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 21, 2:06 PM EDT | Tornado Watch | SPC | 7 hr |
| Jul 21, 3:37 PM EDT | Severe Thunderstorm Warning | PHI | 53 min |
| Jul 21, 3:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 21, 3:58 PM EDT | Severe Thunderstorm Warning | PHI | 47 min |
| Jul 21, 4:23 PM EDT | Severe Thunderstorm Warning | PHI | 52 min |
| Jul 21, 4:31 PM EDT | Flash Flood Warning | PHI | 96 min |
| Jul 21, 4:38 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Jul 21, 4:43 PM EDT | Severe Thunderstorm Warning | PHI | 47 min |
| Jul 27, 2:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 27, 2:15 PM EDT | Flood Watch | PHI | 38 hr |
| Jul 27, 3:01 PM EDT | Severe Thunderstorm Warning | PHI | 44 min |
| Jul 27, 7:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jul 27, 8:01 PM EDT | Severe Thunderstorm Warning | PHI | 23 min |
| Jul 28, 12:08 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 12:51 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 28, 2:30 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 4:20 PM EDT | Tornado Watch | SPC | 5 hr |
| Jul 28, 4:53 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 5:29 PM EDT | Severe Thunderstorm Warning | PHI | 61 min |
| Jul 28, 6:16 PM EDT | Tornado Warning | PHI | 29 min |
| Jul 28, 6:23 PM EDT | Severe Thunderstorm Warning | PHI | 67 min |
| Jul 28, 7:06 PM EDT | Severe Thunderstorm Warning | PHI | 54 min |
| Jul 28, 7:08 PM EDT | Severe Thunderstorm Warning | PHI | 35 min |
| Jul 28, 7:24 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Aug 2, 2:20 PM EDT | Flood Watch | PHI | 26 hr |
| Aug 3, 3:01 AM EDT | Flash Flood Warning | PHI | 3 hr |
| Aug 5, 1:50 PM EDT | Heat Advisory | PHI | 3 days |
| Aug 5, 9:04 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Aug 6, 1:39 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 12:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 1:22 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 7, 4:56 PM EDT | Severe Thunderstorm Warning | PHI | 64 min |
| Aug 8, 11:55 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 8, 12:55 PM EDT | Severe Thunderstorm Warning | PHI | 50 min |
| Aug 8, 1:12 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 8, 1:26 PM EDT | Severe Thunderstorm Warning | PHI | 49 min |
| Aug 8, 1:44 PM EDT | Severe Thunderstorm Warning | PHI | 46 min |
| Aug 10, 9:29 AM EDT | Mesoscale Discussion | SPC | 91 min |
| Aug 10, 1:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 2:10 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 10, 4:46 PM EDT | Severe Thunderstorm Warning | PHI | 20 min |
| Aug 11, 2:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 16, 11:21 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Aug 17, 6:03 PM EDT | Severe Thunderstorm Warning | PHI | 42 min |
| Aug 17, 6:45 PM EDT | Severe Thunderstorm Warning | PHI | 32 min |
| Aug 19, 2:08 PM EDT | Flood Watch | PHI | 31 hr |
| Aug 20, 1:53 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 20, 2:31 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 20, 2:58 PM EDT | Tornado Watch | SPC | 7 hr |
| Aug 20, 4:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 20, 4:50 PM EDT | Severe Thunderstorm Warning | PHI | 40 min |
| Aug 20, 4:59 PM EDT | Severe Thunderstorm Warning | PHI | 46 min |
| Aug 20, 5:22 PM EDT | Tornado Warning | PHI | 38 min |
| Aug 20, 5:27 PM EDT | Severe Thunderstorm Warning | PHI | 48 min |
| Aug 20, 5:39 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Aug 23, 3:49 AM EDT | Flash Flood Warning | PHI | 3 hr |
| Aug 26, 2:31 PM EDT | Flood Watch | PHI | 35 hr |
| Aug 27, 12:51 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 27, 4:06 PM EDT | Severe Thunderstorm Warning | PHI | 39 min |
| Aug 27, 5:08 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Aug 27, 9:09 PM EDT | Areal Flood Warning | PHI | 4 hr |
| Aug 27, 10:22 PM EDT | Severe Thunderstorm Warning | PHI | 38 min |
| Aug 27, 10:36 PM EDT | Flash Flood Warning | PHI | 3 hr |
| Aug 30, 10:04 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Sep 1, 2:30 AM EDT | Heat Advisory | PHI | 18 hr |
| Sep 1, 3:13 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 1, 4:32 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 1, 6:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Sep 1, 6:56 PM EDT | Severe Thunderstorm Warning | PHI | 49 min |
| Sep 1, 7:13 PM EDT | Severe Thunderstorm Warning | PHI | 47 min |
| Sep 1, 7:43 PM EDT | Severe Thunderstorm Warning | PHI | 47 min |
| Sep 1, 8:17 PM EDT | Severe Thunderstorm Warning | PHI | 58 min |
| Sep 1, 8:44 PM EDT | Flash Flood Warning | PHI | 3 hr |
| Sep 2, 3:53 AM EDT | Heat Advisory | PHI | 40 hr |
| Sep 2, 12:40 PM EDT | Severe Thunderstorm Warning | PHI | 65 min |
| Sep 3, 1:34 AM EDT | Flash Flood Warning | PHI | 4 hr |
| Sep 3, 5:26 AM EDT | Areal Flood Warning | PHI | 4 hr |
| Sep 3, 8:09 AM EDT | River Flood Warning | PHI | 3 hr |
| Sep 3, 8:38 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 22, 2:51 AM EDT | Wind Advisory | PHI | 6 days |
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 archive2025
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.