Alert archive / Pennsylvania / Lancaster County
Weather alerts in Lancaster County, Pennsylvania, 2019
228 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 228
- Warnings
- 50
- Watches
- 35
- Advisories
- 45
- Busiest month
- July45 alerts
- Busiest day
- July 11, 20199 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 3 tornado warnings covering Lancaster County in 2019 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.
Lancaster County, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 0 | 100% | 1 | 0% | |
| Severe thunderstorm warnings | 34 | 23 | 32% | 36 | 94% | 25 min |
| Flash flood warnings | 3 | 1 | 67% | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS State College, PA: tornado warnings | 21 | 6 | 71% | 17 | 35% | 7 min |
| NWS State College, PA: severe thunderstorm warnings | 284 | 177 | 38% | 468 | 81% | 22 min |
| NWS State College, PA: flash flood warnings | 22 | 12 | 45% | 30 | 87% | 49 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 10, 2:14 AM EST | Wind Advisory | CTP | 11 hr |
| Jan 11, 2:45 PM EST | Winter Weather Advisory | CTP | 52 hr |
| Jan 17, 4:17 AM EST | Winter Storm Watch | CTP | 33 hr |
| Jan 17, 4:57 PM EST | Special Weather Statement | CTP | 63 min |
| Jan 17, 5:18 PM EST | Winter Weather Advisory | CTP | 11 hr |
| Jan 18, 4:45 AM EST | Winter Storm Warning | CTP | 53 hr |
| Jan 19, 2:32 PM EST | Winter Weather Advisory | CTP | 20 hr |
| Jan 19, 6:24 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Jan 20, 4:06 AM EST | Wind Chill Advisory | CTP | 33 hr |
| Jan 28, 1:27 PM EST | Winter Weather Advisory | CTP | 30 hr |
| Jan 29, 2:31 PM EST | Wind Chill Advisory | CTP | 63 hr |
| Jan 30, 11:07 AM EST | Snow Squall Warning | CTP | 2 hr |
| Jan 30, 11:10 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 31, 2:47 PM EST | Winter Weather Advisory | CTP | 26 hr |
| Feb 10, 12:25 PM EST | Winter Weather Advisory | CTP | 64 hr |
| Feb 10, 3:55 PM EST | Winter Storm Watch | CTP | 21 hr |
| Feb 11, 3:50 AM EST | Winter Storm Warning | CTP | 38 hr |
| Feb 12, 4:16 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 12, 10:48 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 17, 4:05 AM EST | Winter Weather Advisory | CTP | 33 hr |
| Feb 18, 2:38 PM EST | Winter Storm Watch | CTP | 24 hr |
| Feb 19, 2:34 PM EST | Winter Storm Warning | CTP | 37 hr |
| Feb 20, 6:32 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 21, 10:51 AM EST | Special Weather Statement | CTP | 84 min |
| Feb 22, 4:12 AM EST | High Wind Watch | CTP | 34 hr |
| Feb 23, 2:24 PM EST | High Wind Warning | CTP | 47 hr |
| Feb 25, 12:54 PM EST | Wind Advisory | CTP | 6 hr |
| Feb 28, 10:21 AM EST | Winter Weather Advisory | CTP | 20 hr |
| Mar 1, 12:18 PM EST | Winter Weather Advisory | CTP | 17 hr |
| Mar 1, 3:06 PM EST | Winter Storm Watch | CTP | 37 hr |
| Mar 3, 4:30 AM EST | Winter Storm Warning | CTP | 20 hr |
| Mar 3, 5:41 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Mar 10, 11:29 PM EDT | Dense Fog Advisory | CTP | 5 hr |
| Mar 15, 4:05 PM EDT | Special Weather Statement | CTP | 25 min |
| Mar 15, 5:09 PM EDT | Special Weather Statement | CTP | 51 min |
| Mar 15, 6:14 PM EDT | Special Weather Statement | CTP | 46 min |
| Mar 15, 6:55 PM EDT | Special Weather Statement | CTP | 65 min |
| Mar 15, 7:05 PM EDT | Severe Thunderstorm Warning | CTP | 25 min |
| Mar 15, 7:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 15, 7:56 PM EDT | Special Weather Statement | CTP | 49 min |
| Mar 21, 2:58 AM EDT | Flood Watch | CTP | 29 hr |
| Mar 22, 2:10 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Apr 2, 10:53 AM EDT | Fire Weather Watch | CTP | 16 hr |
| Apr 3, 3:07 AM EDT | Red Flag Warning | CTP | 18 hr |
| Apr 14, 5:22 PM EDT | Flash Flood Watch | CTP | 10 hr |
| Apr 14, 6:46 PM EDT | Tornado Watch | SPC | 8 hr |
| Apr 14, 9:53 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Apr 14, 11:56 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 15, 2:00 AM EDT | Special Weather Statement | CTP | 60 min |
| Apr 15, 2:58 AM EDT | Special Weather Statement | CTP | 32 min |
| Apr 15, 3:49 AM EDT | Wind Advisory | CTP | 16 hr |
| Apr 18, 2:01 PM EDT | Flash Flood Watch | CTP | 42 hr |
| Apr 19, 5:59 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 19, 6:34 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 19, 8:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 26, 11:37 AM EDT | Mesoscale Discussion | SPC | 113 min |
| Apr 26, 1:33 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 26, 2:09 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 26, 3:20 PM EDT | Severe Thunderstorm Warning | CTP | 70 min |
| Apr 27, 4:12 AM EDT | Wind Advisory | CTP | 11 hr |
| Apr 28, 10:57 AM EDT | Frost Advisory | CTP | 21 hr |
| May 3, 6:27 PM EDT | Mesoscale Discussion | SPC | 63 min |
| May 4, 2:06 PM EDT | Flash Flood Watch | CTP | 21 hr |
| May 19, 1:27 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 19, 2:36 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 19, 4:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| May 19, 6:10 PM EDT | Severe Thunderstorm Warning | CTP | 35 min |
| May 19, 6:56 PM EDT | Tornado Warning | CTP | 34 min |
| May 19, 7:24 PM EDT | Severe Thunderstorm Warning | CTP | 51 min |
| May 19, 8:05 PM EDT | Severe Thunderstorm Warning | CTP | 40 min |
| May 19, 8:44 PM EDT | Severe Thunderstorm Warning | CTP | 46 min |
| May 19, 9:03 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 23, 1:02 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 23, 9:20 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 23, 9:24 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 23, 10:23 PM EDT | Severe Thunderstorm Warning | CTP | 55 min |
| May 23, 10:38 PM EDT | Severe Thunderstorm Warning | CTP | 35 min |
| May 23, 11:02 PM EDT | Tornado Warning | CTP | 13 min |
| May 26, 11:14 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 26, 4:47 PM EDT | Special Weather Statement | CTP | 43 min |
| May 26, 4:55 PM EDT | Severe Thunderstorm Warning | CTP | 35 min |
| May 26, 5:45 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 28, 1:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| May 28, 1:13 PM EDT | Flash Flood Watch | CTP | 32 hr |
| May 28, 1:48 PM EDT | Tornado Watch | SPC | 8 hr |
| May 28, 4:43 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 28, 5:26 PM EDT | Severe Thunderstorm Warning | CTP | 49 min |
| May 28, 5:58 PM EDT | Severe Thunderstorm Warning | CTP | 32 min |
| May 28, 6:31 PM EDT | Severe Thunderstorm Warning | CTP | 13 min |
| May 28, 8:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 29, 12:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| May 29, 1:10 PM EDT | Tornado Watch | SPC | 8 hr |
| May 29, 3:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| May 29, 4:36 PM EDT | Severe Thunderstorm Warning | CTP | 54 min |
| May 29, 5:39 PM EDT | Severe Thunderstorm Warning | CTP | 66 min |
| May 30, 3:48 AM EDT | Flash Flood Watch | CTP | 18 hr |
| May 30, 12:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 30, 2:01 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 30, 3:56 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 2, 1:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 2, 3:05 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 2, 5:14 PM EDT | Special Weather Statement | CTP | 31 min |
| Jun 2, 5:55 PM EDT | Severe Thunderstorm Warning | CTP | 51 min |
| Jun 2, 6:24 PM EDT | Special Weather Statement | CTP | 36 min |
| Jun 16, 1:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 16, 5:33 PM EDT | Special Weather Statement | CTP | 12 min |
| Jun 17, 3:30 AM EDT | Flash Flood Watch | CTP | 42 hr |
| Jun 18, 12:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 19, 1:49 PM EDT | Flash Flood Watch | CTP | 10 hr |
| Jun 19, 11:50 PM EDT | Areal Flood Advisory | CTP | 115 min |
| Jun 20, 1:41 AM EDT | Areal Flood Advisory | CTP | 2 hr |
| Jun 20, 4:17 AM EDT | Flash Flood Watch | CTP | 24 hr |
| Jun 20, 1:16 PM EDT | Special Weather Statement | CTP | 29 min |
| Jun 20, 1:53 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 4:00 PM EDT | Special Weather Statement | CTP | 30 min |
| Jun 28, 4:04 PM EDT | Severe Thunderstorm Warning | CTP | 41 min |
| Jun 28, 5:59 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 12:08 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 29, 1:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 29, 2:45 PM EDT | Severe Thunderstorm Warning | CTP | 60 min |
| Jun 29, 3:15 PM EDT | Severe Thunderstorm Warning | CTP | 60 min |
| Jun 29, 7:41 PM EDT | Special Weather Statement | CTP | 19 min |
| Jun 29, 7:53 PM EDT | Severe Thunderstorm Warning | CTP | 26 min |
| Jul 2, 5:53 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 2, 6:09 PM EDT | Special Weather Statement | CTP | 36 min |
| Jul 2, 6:27 PM EDT | Severe Thunderstorm Warning | CTP | 78 min |
| Jul 5, 1:54 PM EDT | Areal Flood Advisory | CTP | 111 min |
| Jul 6, 1:48 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 6:22 PM EDT | Areal Flood Advisory | CTP | 113 min |
| Jul 6, 6:26 PM EDT | Severe Thunderstorm Warning | CTP | 79 min |
| Jul 6, 6:50 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Jul 7, 8:32 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 7, 8:45 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 11, 3:24 AM EDT | Flash Flood Watch | CTP | 17 hr |
| Jul 11, 12:51 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 11, 2:10 PM EDT | Special Weather Statement | CTP | 50 min |
| Jul 11, 2:50 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 11, 3:18 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Jul 11, 3:57 PM EDT | Special Weather Statement | CTP | 48 min |
| Jul 11, 4:08 PM EDT | Special Weather Statement | CTP | 37 min |
| Jul 11, 4:43 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 11, 6:25 PM EDT | Areal Flood Warning | CTP | 2 hr |
| Jul 16, 6:53 PM EDT | Special Weather Statement | CTP | 52 min |
| Jul 17, 9:18 AM EDT | Heat Advisory | CTP | 10 hr |
| Jul 17, 1:03 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 1:58 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 17, 3:00 PM EDT | Excessive Heat Watch | CTP | 24 hr |
| Jul 17, 3:59 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 6:12 PM EDT | Severe Thunderstorm Warning | CTP | 78 min |
| Jul 17, 6:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jul 17, 6:39 PM EDT | Tornado Warning | CTP | 21 min |
| Jul 18, 1:49 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 18, 3:02 PM EDT | Excessive Heat Warning | CTP | 3 days |
| Jul 18, 3:02 PM EDT | Heat Advisory | CTP | 53 hr |
| Jul 21, 3:07 PM EDT | Flash Flood Watch | CTP | 35 hr |
| Jul 21, 8:37 PM EDT | Severe Thunderstorm Warning | CTP | 68 min |
| Jul 22, 1:11 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jul 22, 2:17 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 22, 3:00 PM EDT | Severe Thunderstorm Warning | CTP | 60 min |
| Jul 22, 3:59 PM EDT | Severe Thunderstorm Warning | CTP | 61 min |
| Jul 22, 4:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 22, 8:51 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 22, 10:06 PM EDT | Severe Thunderstorm Warning | CTP | 27 min |
| Jul 22, 11:17 PM EDT | Areal Flood Advisory | CTP | 118 min |
| Jul 23, 1:22 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 30, 6:54 PM EDT | Special Weather Statement | CTP | 51 min |
| Jul 30, 7:17 PM EDT | Severe Thunderstorm Warning | CTP | 40 min |
| Jul 30, 9:59 PM EDT | Special Weather Statement | CTP | 31 min |
| Aug 1, 2:18 PM EDT | Special Weather Statement | CTP | 27 min |
| Aug 1, 2:32 PM EDT | Severe Thunderstorm Warning | CTP | 43 min |
| Aug 1, 3:13 PM EDT | Severe Thunderstorm Warning | CTP | 62 min |
| Aug 1, 3:20 PM EDT | Areal Flood Advisory | CTP | 115 min |
| Aug 1, 4:09 PM EDT | Severe Thunderstorm Warning | CTP | 36 min |
| Aug 3, 5:44 PM EDT | Special Weather Statement | CTP | 31 min |
| Aug 3, 6:30 PM EDT | Special Weather Statement | CTP | 30 min |
| Aug 7, 1:02 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Aug 7, 2:10 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 7, 2:46 PM EDT | Special Weather Statement | CTP | 29 min |
| Aug 7, 3:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Aug 16, 1:28 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 16, 4:30 PM EDT | Special Weather Statement | CTP | 30 min |
| Aug 17, 11:38 AM EDT | Special Weather Statement | CTP | 52 min |
| Aug 17, 12:30 PM EDT | Special Weather Statement | CTP | 45 min |
| Aug 17, 1:11 PM EDT | Special Weather Statement | CTP | 34 min |
| Aug 17, 1:27 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 18, 4:18 PM EDT | Special Weather Statement | CTP | 12 min |
| Aug 18, 4:29 PM EDT | Special Weather Statement | CTP | 16 min |
| Aug 18, 5:03 PM EDT | Areal Flood Advisory | CTP | 117 min |
| Aug 18, 7:53 PM EDT | Severe Thunderstorm Warning | CTP | 55 min |
| Aug 19, 9:54 AM EDT | Heat Advisory | CTP | 8 hr |
| Aug 21, 11:31 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 21, 3:27 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 21, 7:39 PM EDT | Special Weather Statement | CTP | 36 min |
| Aug 22, 7:11 PM EDT | Special Weather Statement | CTP | 64 min |
| Aug 22, 7:25 PM EDT | Special Weather Statement | CTP | 20 min |
| Aug 22, 7:47 PM EDT | Special Weather Statement | CTP | 28 min |
| Sep 2, 2:01 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Sep 2, 4:31 PM EDT | Special Weather Statement | CTP | 29 min |
| Sep 2, 6:10 PM EDT | Areal Flood Advisory | CTP | 65 min |
| Sep 2, 6:14 PM EDT | Special Weather Statement | CTP | 16 min |
| Sep 2, 6:31 PM EDT | Severe Thunderstorm Warning | CTP | 29 min |
| Sep 2, 7:00 PM EDT | Special Weather Statement | CTP | 30 min |
| Sep 2, 7:25 PM EDT | Special Weather Statement | CTP | 20 min |
| Sep 12, 2:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Sep 28, 5:51 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Sep 28, 8:12 PM EDT | Special Weather Statement | CTP | 48 min |
| Sep 28, 9:23 PM EDT | Special Weather Statement | CTP | 37 min |
| Sep 28, 10:02 PM EDT | Special Weather Statement | CTP | 43 min |
| Oct 16, 4:40 AM EDT | Wind Advisory | CTP | 37 hr |
| Oct 18, 2:48 AM EDT | Frost Advisory | CTP | 29 hr |
| Oct 27, 7:37 AM EDT | Special Weather Statement | CTP | 23 min |
| Oct 27, 8:06 AM EDT | Special Weather Statement | CTP | 54 min |
| Oct 27, 9:26 AM EDT | Special Weather Statement | CTP | 79 min |
| Oct 31, 2:56 PM EDT | Tornado Watch | SPC | 10 hr |
| Oct 31, 7:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 31, 8:05 PM EDT | Severe Thunderstorm Warning | CTP | 85 min |
| Oct 31, 8:43 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Oct 31, 9:21 PM EDT | Special Weather Statement | CTP | 69 min |
| Oct 31, 10:07 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Oct 31, 10:25 PM EDT | Severe Thunderstorm Warning | CTP | 50 min |
| Oct 31, 10:26 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Nov 1, 4:17 AM EDT | Freeze Watch | CTP | 10 hr |
| Nov 1, 2:01 PM EDT | Freeze Warning | CTP | 19 hr |
| Nov 26, 2:32 PM EST | Wind Advisory | CTP | 45 hr |
| Nov 28, 12:01 PM EST | Wind Advisory | CTP | 6 hr |
| Nov 29, 2:17 PM EST | Winter Weather Advisory | CTP | 71 hr |
| Dec 13, 8:21 PM EST | Dense Fog Advisory | CTP | 4 hr |
| Dec 15, 1:52 PM EST | Winter Weather Advisory | CTP | 45 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 archive20182020
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.