Alert archive / Pennsylvania / York County
Weather alerts in York County, Pennsylvania, 2016
149 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
York County and its neighbors
Each county as a circle sized by its count in 2016. Tap one for its archive.
- Alerts
- 149
- Warnings
- 34
- Watches
- 18
- Advisories
- 37
- Busiest month
- July32 alerts
- Busiest day
- June 28, 20168 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
York County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 21 | 17 | 19% | 22 | 86% | 32 min |
| Flash flood warnings | 1 | 1 | 0% | 2 | 100% | 5 min |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS State College, PA: tornado warnings | 4 | 3 | 25% | 7 | 71% | 14 min |
| NWS State College, PA: severe thunderstorm warnings | 104 | 73 | 30% | 197 | 79% | 29 min |
| NWS State College, PA: flash flood warnings | 9 | 6 | 33% | 9 | 100% | 46 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 12, 4:52 PM EST | Special Weather Statement | CTP | 53 min |
| Jan 12, 6:01 PM EST | Special Weather Statement | CTP | 74 min |
| Jan 20, 3:42 PM EST | Winter Storm Watch | CTP | 37 hr |
| Jan 21, 2:47 PM EST | Winter Storm Warning | CTP | 53 hr |
| Jan 22, 5:01 PM EST | Blizzard Warning | CTP | 27 hr |
| Jan 22, 9:56 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 23, 12:08 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 23, 4:20 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 23, 8:51 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 23, 12:44 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 23, 2:30 PM EST | Special Weather Statement | CTP | 75 min |
| Jan 23, 6:40 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 25, 9:30 PM EST | Freezing Rain Advisory | CTP | 12 hr |
| Feb 1, 2:10 PM EST | Flood Watch | CTP | 62 hr |
| Feb 3, 7:43 PM EST | Dense Fog Advisory | CTP | 11 hr |
| Feb 4, 1:19 AM EST | Areal Flood Advisory | CTP | 7 hr |
| Feb 8, 4:34 AM EST | Winter Storm Watch | CTP | 10 hr |
| Feb 8, 2:21 PM EST | Winter Storm Warning | CTP | 31 hr |
| Feb 12, 4:35 AM EST | Wind Chill Advisory | CTP | 54 hr |
| Feb 12, 1:22 PM EST | Wind Advisory | CTP | 28 hr |
| Feb 14, 2:32 PM EST | Winter Weather Advisory | CTP | 43 hr |
| Feb 15, 5:10 AM EST | Winter Storm Warning | CTP | 35 hr |
| Feb 15, 1:46 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 15, 8:29 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 24, 2:38 PM EST | Flash Flood Watch | CTP | 6 hr |
| Feb 24, 3:20 PM EST | Tornado Watch | SPC | 8 hr |
| Feb 24, 4:54 PM EST | Areal Flood Advisory | CTP | 3 hr |
| Feb 24, 5:36 PM EST | Severe Thunderstorm Warning | CTP | 39 min |
| Feb 24, 6:10 PM EST | Severe Thunderstorm Warning | CTP | 80 min |
| Feb 24, 7:30 PM EST | Severe Thunderstorm Warning | CTP | 45 min |
| Feb 24, 11:24 PM EST | River Flood Warning | CTP | 17 hr |
| Feb 24, 11:44 PM EST | Areal Flood Advisory | CTP | 3 hr |
| Feb 25, 2:43 AM EST | Areal Flood Advisory | CTP | 4 hr |
| Feb 25, 9:11 AM EST | River Flood Warning | CTP | 10 hr |
| Mar 16, 4:08 AM EDT | Dense Fog Advisory | CTP | 6 hr |
| Mar 28, 3:42 AM EDT | Wind Advisory | CTP | 18 hr |
| Apr 1, 1:46 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Apr 1, 4:20 PM EDT | Wind Advisory | CTP | 40 hr |
| Apr 2, 10:33 AM EDT | High Wind Warning | CTP | 22 hr |
| Apr 9, 4:12 AM EDT | Special Weather Statement | CTP | 48 min |
| Apr 9, 1:45 PM EDT | Special Weather Statement | CTP | 30 min |
| Apr 12, 2:22 PM EDT | Frost Advisory | CTP | 18 hr |
| Apr 13, 2:05 PM EDT | Frost Advisory | CTP | 18 hr |
| Apr 13, 9:33 PM EDT | Freeze Warning | CTP | 10 hr |
| Apr 14, 2:07 PM EDT | Frost Advisory | CTP | 18 hr |
| Apr 18, 1:04 PM EDT | Fire Weather Watch | CTP | 15 hr |
| Apr 19, 4:22 AM EDT | Red Flag Warning | CTP | 16 hr |
| Apr 26, 1:19 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Apr 26, 1:54 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 26, 6:46 PM EDT | Mesoscale Discussion | SPC | 59 min |
| May 2, 9:11 PM EDT | Special Weather Statement | CTP | 34 min |
| May 2, 9:53 PM EDT | Special Weather Statement | CTP | 22 min |
| May 14, 12:54 PM EDT | Special Weather Statement | CTP | 96 min |
| May 23, 2:36 PM EDT | Special Weather Statement | CTP | 39 min |
| May 23, 3:06 PM EDT | Special Weather Statement | CTP | 39 min |
| Jun 3, 12:59 PM EDT | Special Weather Statement | CTP | 46 min |
| Jun 5, 1:14 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jun 5, 3:12 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 5, 3:37 PM EDT | Severe Thunderstorm Warning | CTP | 68 min |
| Jun 7, 1:32 PM EDT | Special Weather Statement | CTP | 58 min |
| Jun 7, 2:14 PM EDT | Special Weather Statement | CTP | 31 min |
| Jun 11, 2:32 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 16, 1:58 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 16, 6:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 21, 7:22 AM EDT | Severe Thunderstorm Warning | CTP | 53 min |
| Jun 21, 8:11 AM EDT | Severe Thunderstorm Warning | CTP | 27 min |
| Jun 21, 12:00 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 21, 7:59 PM EDT | Severe Thunderstorm Warning | CTP | 61 min |
| Jun 28, 3:44 PM EDT | Severe Thunderstorm Warning | CTP | 61 min |
| Jun 28, 3:49 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jun 28, 4:09 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 28, 4:31 PM EDT | Areal Flood Advisory | CTP | 119 min |
| Jun 28, 4:44 PM EDT | Severe Thunderstorm Warning | CTP | 61 min |
| Jun 28, 5:13 PM EDT | Severe Thunderstorm Warning | CTP | 47 min |
| Jun 28, 6:56 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jun 28, 7:16 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jul 1, 12:51 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jul 1, 1:33 PM EDT | Severe Thunderstorm Warning | CTP | 72 min |
| Jul 1, 1:56 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 1, 2:10 PM EDT | Severe Thunderstorm Warning | CTP | 50 min |
| Jul 8, 12:54 PM EDT | Special Weather Statement | CTP | 66 min |
| Jul 8, 4:41 PM EDT | Special Weather Statement | CTP | 49 min |
| Jul 13, 5:52 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 18, 11:40 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 18, 1:42 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 18, 2:43 PM EDT | Special Weather Statement | CTP | 47 min |
| Jul 18, 3:13 PM EDT | Areal Flood Advisory | CTP | 2 hr |
| Jul 18, 3:45 PM EDT | Special Weather Statement | CTP | 45 min |
| Jul 23, 2:34 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 4:17 PM EDT | Severe Thunderstorm Warning | CTP | 58 min |
| Jul 23, 5:13 PM EDT | Severe Thunderstorm Warning | CTP | 62 min |
| Jul 23, 5:37 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 23, 6:09 PM EDT | Severe Thunderstorm Warning | CTP | 66 min |
| Jul 24, 2:26 PM EDT | Heat Advisory | CTP | 28 hr |
| Jul 25, 9:37 AM EDT | Excessive Heat Warning | CTP | 9 hr |
| Jul 25, 12:41 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jul 25, 12:43 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 25, 3:03 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jul 25, 4:52 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 25, 6:52 PM EDT | Special Weather Statement | CTP | 53 min |
| Jul 25, 7:03 PM EDT | Severe Thunderstorm Warning | CTP | 68 min |
| Jul 28, 12:58 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 1:27 PM EDT | Flood Watch | CTP | 8 hr |
| Jul 28, 3:00 PM EDT | Special Weather Statement | CTP | 30 min |
| Jul 28, 3:21 PM EDT | Areal Flood Advisory | CTP | 114 min |
| Jul 28, 3:57 PM EDT | Flash Flood Warning | CTP | 2 hr |
| Jul 29, 3:01 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 30, 12:11 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Aug 1, 2:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 1, 4:08 PM EDT | Special Weather Statement | CTP | 22 min |
| Aug 1, 4:41 PM EDT | Special Weather Statement | CTP | 34 min |
| Aug 1, 5:23 PM EDT | Special Weather Statement | CTP | 37 min |
| Aug 6, 12:54 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 6, 3:46 PM EDT | Special Weather Statement | CTP | 44 min |
| Aug 6, 4:37 PM EDT | Special Weather Statement | CTP | 23 min |
| Aug 11, 12:38 PM EDT | Heat Advisory | CTP | 3 days |
| Aug 11, 2:25 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 11, 3:45 PM EDT | Excessive Heat Watch | CTP | 37 hr |
| Aug 12, 2:45 PM EDT | Excessive Heat Warning | CTP | 51 hr |
| Aug 13, 4:19 PM EDT | Special Weather Statement | CTP | 56 min |
| Aug 16, 3:24 AM EDT | Heat Advisory | CTP | 13 hr |
| Aug 16, 1:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 16, 2:56 PM EDT | Special Weather Statement | CTP | 64 min |
| Aug 16, 3:04 PM EDT | Severe Thunderstorm Warning | CTP | 56 min |
| Aug 16, 3:20 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 16, 3:56 PM EDT | Severe Thunderstorm Warning | CTP | 64 min |
| Aug 16, 4:27 PM EDT | Special Weather Statement | CTP | 33 min |
| Aug 16, 4:35 PM EDT | Severe Thunderstorm Warning | CTP | 70 min |
| Aug 16, 10:00 PM EDT | Special Weather Statement | CTP | 60 min |
| Sep 8, 12:11 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Sep 19, 2:36 AM EDT | Special Weather Statement | CTP | 54 min |
| Sep 19, 4:18 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Sep 28, 7:47 AM EDT | Flood Watch | CTP | 35 hr |
| Oct 10, 4:27 AM EDT | Frost Advisory | CTP | 29 hr |
| Oct 14, 2:35 PM EDT | Frost Advisory | CTP | 18 hr |
| Oct 24, 2:43 PM EDT | Freeze Watch | CTP | 13 hr |
| Oct 25, 3:37 AM EDT | Freeze Warning | CTP | 29 hr |
| Oct 30, 3:29 PM EDT | Severe Thunderstorm Warning | CTP | 76 min |
| Oct 30, 3:55 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 30, 4:32 PM EDT | Severe Thunderstorm Warning | CTP | 58 min |
| Nov 19, 4:54 AM EST | Wind Advisory | CTP | 62 hr |
| Nov 29, 9:06 PM EST | Dense Fog Advisory | CTP | 10 hr |
| Dec 10, 2:20 PM EST | Winter Weather Advisory | CTP | 43 hr |
| Dec 11, 8:12 PM EST | Winter Weather Advisory | CTP | 8 hr |
| Dec 16, 3:39 AM EST | Winter Weather Advisory | CTP | 44 hr |
| Dec 17, 4:21 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 17, 9:31 PM EST | Dense Fog Advisory | CTP | 9 hr |
| Dec 17, 11:34 PM EST | Special Weather Statement | CTP | 56 min |
| Dec 25, 2:06 PM EST | Freezing Rain Advisory | CTP | 21 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 archive20152017
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.