Alert archive / Pennsylvania / Lancaster County
Weather alerts in Lancaster County, Pennsylvania, 2023
163 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Lancaster County and its neighbors
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Alerts
- 163
- Warnings
- 40
- Watches
- 27
- Advisories
- 23
- Busiest month
- July51 alerts
- Busiest day
- September 7, 202310 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 2 tornado warnings covering Lancaster County in 2023 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.
Lancaster County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 1 | 0% | |
| Severe thunderstorm warnings | 30 | 21 | 30% | 29 | 97% | 17 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS State College, PA: tornado warnings | 18 | 5 | 72% | 15 | 40% | 3 min |
| NWS State College, PA: severe thunderstorm warnings | 186 | 136 | 27% | 381 | 83% | 19 min |
| NWS State College, PA: flash flood warnings | 8 | 3 | 63% | 8 | 63% | 42 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, 11:19 PM EST | Dense Fog Advisory | CTP | 12 hr |
| Jan 24, 4:16 AM EST | Winter Weather Advisory | CTP | 42 hr |
| Feb 21, 3:22 AM EST | Wind Advisory | CTP | 16 hr |
| Feb 21, 2:22 PM EST | Mesoscale Discussion | SPC | 53 min |
| Mar 3, 12:41 PM EST | Wind Advisory | CTP | 26 hr |
| Mar 13, 2:35 PM EDT | Wind Advisory | CTP | 33 hr |
| Mar 23, 8:59 PM EDT | Special Weather Statement | CTP | 16 min |
| Mar 23, 9:17 PM EDT | Special Weather Statement | CTP | 13 min |
| Mar 31, 3:22 PM EDT | High Wind Warning | CTP | 30 hr |
| Mar 31, 3:22 PM EDT | Wind Advisory | CTP | 35 hr |
| Apr 1, 2:27 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 1, 4:50 PM EDT | Severe Thunderstorm Warning | CTP | 40 min |
| Apr 1, 5:16 PM EDT | Severe Thunderstorm Warning | CTP | 74 min |
| Apr 2, 11:00 AM EDT | Frost Advisory | CTP | 22 hr |
| Apr 7, 8:03 PM EDT | Freeze Watch | CTP | 7 hr |
| Apr 8, 3:07 AM EDT | Freeze Warning | CTP | 30 hr |
| Apr 8, 11:50 AM EDT | Freeze Watch | CTP | 22 hr |
| Apr 9, 9:28 AM EDT | Freeze Warning | CTP | 24 hr |
| Apr 11, 3:49 PM EDT | Fire Weather Watch | CTP | 17 hr |
| Apr 12, 8:54 AM EDT | Red Flag Warning | CTP | 11 hr |
| Apr 16, 7:41 AM EDT | Dense Fog Advisory | CTP | 2 hr |
| Apr 22, 2:38 PM EDT | Severe Thunderstorm Warning | CTP | 37 min |
| Apr 22, 2:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Apr 22, 3:04 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 22, 3:16 PM EDT | Severe Thunderstorm Warning | CTP | 44 min |
| Apr 22, 3:58 PM EDT | Severe Thunderstorm Warning | CTP | 28 min |
| Apr 23, 12:52 PM EDT | Frost Advisory | CTP | 19 hr |
| Apr 24, 2:09 PM EDT | Frost Advisory | CTP | 19 hr |
| Apr 26, 3:46 PM EDT | Special Weather Statement | CTP | 44 min |
| Apr 30, 8:31 AM EDT | Flood Watch | CTP | 11 hr |
| Apr 30, 8:52 PM EDT | Areal Flood Advisory | CTP | 2 hr |
| May 17, 11:05 AM EDT | Frost Advisory | CTP | 21 hr |
| Jun 2, 3:02 PM EDT | Special Weather Statement | CTP | 28 min |
| Jun 5, 3:30 PM EDT | Fire Weather Watch | CTP | 17 hr |
| Jun 6, 8:26 AM EDT | Red Flag Warning | CTP | 12 hr |
| Jun 6, 6:01 PM EDT | Special Weather Statement | CTP | 29 min |
| Jun 6, 6:54 PM EDT | Special Weather Statement | CTP | 51 min |
| Jun 9, 7:16 PM EDT | Special Weather Statement | CTP | 44 min |
| Jun 14, 1:14 PM EDT | Special Weather Statement | CTP | 31 min |
| Jun 14, 1:56 PM EDT | Severe Thunderstorm Warning | CTP | 16 min |
| Jun 14, 1:58 PM EDT | Severe Thunderstorm Warning | CTP | 17 min |
| Jun 16, 10:21 AM EDT | Special Weather Statement | CTP | 39 min |
| Jun 16, 10:33 AM EDT | Severe Thunderstorm Warning | CTP | 42 min |
| Jun 16, 10:50 AM EDT | Tornado Warning | CTP | 25 min |
| Jun 25, 2:55 PM EDT | Special Weather Statement | CTP | 35 min |
| Jun 25, 3:29 PM EDT | Special Weather Statement | CTP | 31 min |
| Jun 25, 3:54 PM EDT | Special Weather Statement | CTP | 36 min |
| Jun 26, 3:49 AM EDT | Flood Watch | CTP | 19 hr |
| 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, 8:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 26, 8:20 PM EDT | Severe Thunderstorm Warning | CTP | 40 min |
| Jun 27, 12:33 PM EDT | Special Weather Statement | CTP | 42 min |
| Jun 27, 1:05 PM EDT | Severe Thunderstorm Warning | CTP | 70 min |
| Jun 27, 3:15 PM EDT | Severe Thunderstorm Warning | CTP | 45 min |
| Jun 27, 3:59 PM EDT | Special Weather Statement | CTP | 46 min |
| Jul 2, 3:24 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 2, 4:31 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 2, 6:22 PM EDT | Special Weather Statement | CTP | 38 min |
| Jul 2, 7:02 PM EDT | Special Weather Statement | CTP | 13 min |
| Jul 2, 7:04 PM EDT | Tornado Warning | CTP | 16 min |
| Jul 3, 2:55 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 3, 4:49 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 3, 6:15 PM EDT | Special Weather Statement | CTP | 30 min |
| Jul 3, 6:46 PM EDT | Special Weather Statement | CTP | 29 min |
| Jul 7, 12:34 PM EDT | Special Weather Statement | CTP | 26 min |
| Jul 7, 1:06 PM EDT | Special Weather Statement | CTP | 24 min |
| Jul 7, 1:37 PM EDT | Special Weather Statement | CTP | 23 min |
| Jul 8, 3:12 PM EDT | Flood Watch | CTP | 26 hr |
| Jul 8, 7:16 PM EDT | Special Weather Statement | CTP | 29 min |
| 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, 2:10 PM EDT | Areal Flood Advisory | CTP | 111 min |
| Jul 9, 3:09 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 9, 3:10 PM EDT | Severe Thunderstorm Warning | CTP | 20 min |
| Jul 9, 3:16 PM EDT | Special Weather Statement | CTP | 29 min |
| Jul 9, 3:29 PM EDT | Severe Thunderstorm Warning | CTP | 31 min |
| Jul 13, 2:36 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 13, 7:48 PM EDT | Severe Thunderstorm Warning | CTP | 42 min |
| Jul 14, 2:02 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 4:25 PM EDT | Special Weather Statement | CTP | 50 min |
| Jul 14, 6:16 PM EDT | Severe Thunderstorm Warning | CTP | 44 min |
| Jul 15, 3:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 6:44 PM EDT | Flood Watch | CTP | 23 hr |
| Jul 19, 4:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 19, 5:22 PM EDT | Special Weather Statement | CTP | 38 min |
| Jul 20, 1:46 PM EDT | Special Weather Statement | CTP | 14 min |
| Jul 20, 10:28 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 21, 1:48 AM EDT | Severe Thunderstorm Warning | CTP | 72 min |
| Jul 24, 5:38 AM EDT | Special Weather Statement | CTP | 67 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, 2:41 PM EDT | Special Weather Statement | CTP | 49 min |
| Jul 25, 3:08 PM EDT | Severe Thunderstorm Warning | CTP | 38 min |
| Jul 26, 5:36 AM EDT | Heat Advisory | CTP | 62 hr |
| 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, 4:37 PM EDT | Special Weather Statement | CTP | 53 min |
| Jul 27, 4:46 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 27, 5:15 PM EDT | Severe Thunderstorm Warning | CTP | 60 min |
| Jul 28, 6:45 PM EDT | Special Weather Statement | CTP | 60 min |
| Jul 28, 7:34 PM EDT | Special Weather Statement | CTP | 26 min |
| Jul 28, 7:46 PM EDT | Severe Thunderstorm Warning | CTP | 14 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 |
| Aug 4, 12:10 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Aug 4, 6:13 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 8:18 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Aug 7, 1:20 PM EDT | Tornado Watch | SPC | 11 hr |
| Aug 7, 3:17 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Aug 7, 4:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 7, 5:30 PM EDT | Severe Thunderstorm Warning | CTP | 45 min |
| Aug 7, 6:15 PM EDT | Special Weather Statement | CTP | 30 min |
| Aug 12, 3:05 PM EDT | Special Weather Statement | CTP | 40 min |
| Aug 12, 5:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 11:49 PM EDT | Special Weather Statement | CTP | 56 min |
| Aug 12, 11:59 PM EDT | Severe Thunderstorm Warning | CTP | 46 min |
| Aug 17, 11:04 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 5, 3:00 PM EDT | Heat Advisory | CTP | 28 hr |
| 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, 3:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Sep 7, 3:42 PM EDT | Severe Thunderstorm Warning | CTP | 48 min |
| Sep 7, 4:22 PM EDT | Severe Thunderstorm Warning | CTP | 53 min |
| Sep 7, 4:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Sep 7, 5:11 PM EDT | Severe Thunderstorm Warning | CTP | 34 min |
| Sep 7, 6:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Sep 7, 6:44 PM EDT | Severe Thunderstorm Warning | CTP | 73 min |
| Sep 7, 7:51 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Sep 7, 8:08 PM EDT | Special Weather Statement | CTP | 52 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, 6:04 PM EDT | Special Weather Statement | CTP | 26 min |
| Sep 8, 6:09 PM EDT | Severe Thunderstorm Warning | CTP | 35 min |
| Sep 8, 6:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Sep 8, 6:36 PM EDT | Special Weather Statement | CTP | 24 min |
| Sep 8, 8:02 PM EDT | Severe Thunderstorm Warning | CTP | 43 min |
| Sep 8, 8:43 PM EDT | Severe Thunderstorm Warning | CTP | 47 min |
| Sep 8, 8:51 PM EDT | Severe Thunderstorm Warning | CTP | 24 min |
| Sep 8, 9:15 PM EDT | Severe Thunderstorm Warning | CTP | 45 min |
| Sep 8, 9:22 PM EDT | Special Weather Statement | CTP | 23 min |
| Sep 9, 2:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 9, 4:23 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 9, 6:06 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Sep 9, 7:24 PM EDT | Special Weather Statement | CTP | 36 min |
| Sep 9, 8:08 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 11, 3:47 PM EDT | Special Weather Statement | CTP | 28 min |
| Sep 12, 3:19 PM EDT | Flood Watch | CTP | 12 hr |
| Oct 3, 3:46 AM EDT | Dense Fog Advisory | CTP | 6 hr |
| Oct 23, 1:30 PM EDT | Frost Advisory | CTP | 20 hr |
| Oct 30, 3:02 AM EDT | Frost Advisory | CTP | 30 hr |
| Oct 31, 3:36 AM EDT | Freeze Watch | CTP | 23 hr |
| Nov 1, 2:18 AM EDT | Freeze Warning | CTP | 32 hr |
| Dec 2, 8:05 AM EST | Dense Fog Advisory | CTP | 115 min |
| Dec 8, 2:50 PM EST | Flood Watch | CTP | 58 hr |
| Dec 16, 1:39 PM EST | Flood Watch | CTP | 46 hr |
| Dec 18, 12:37 AM EST | Areal Flood Advisory | CTP | 6 hr |
| Dec 18, 2:21 AM EST | Areal Flood Warning | CTP | 14 hr |
| Dec 18, 11:53 AM EST | River Flood Warning | CTP | 14 hr |
| Dec 26, 3:41 AM EST | Dense Fog Advisory | CTP | 8 hr |
| Dec 27, 9:31 PM EST | Areal Flood Advisory | CTP | 3 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 | 30 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 14 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 33 |
| Special Weather Statement | 40 |
| Flooding | |
| Areal Flood Warning | 1 |
| River Flood Warning | 1 |
| Flood Watch | 7 |
| Areal Flood Advisory | 5 |
| Winter | |
| Winter Weather Advisory | 1 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 3 |
| Frost Advisory | 6 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 4 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 2 |
| 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.