Alert archive / Pennsylvania / Potter County
Weather alerts in Potter County, Pennsylvania, 2020
68 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Potter County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 68
- Warnings
- 8
- Watches
- 11
- Advisories
- 15
- Busiest month
- May11 alerts
- Busiest day
- May 15, 20206 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Potter County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 6 | 3 | 50% | 10 | 60% | 25 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS State College, PA: tornado warnings | 3 | 0 | 100% | 0 | ||
| NWS State College, PA: severe thunderstorm warnings | 163 | 128 | 21% | 422 | 76% | 23 min |
| NWS State College, PA: flash flood warnings | 10 | 6 | 40% | 25 | 92% | 57 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 8, 5:07 AM EST | Special Weather Statement | CTP | 68 min |
| Jan 10, 7:58 AM EST | Winter Weather Advisory | CTP | 4 hr |
| Jan 11, 4:07 AM EST | High Wind Watch | CTP | 10 hr |
| Jan 11, 4:07 AM EST | Wind Advisory | CTP | 30 hr |
| Jan 17, 3:01 PM EST | Winter Weather Advisory | CTP | 30 hr |
| Jan 18, 11:53 AM EST | Special Weather Statement | CTP | 82 min |
| Jan 25, 5:44 AM EST | Special Weather Statement | CTP | 91 min |
| Feb 5, 3:41 AM EST | Winter Weather Advisory | CTP | 30 hr |
| Feb 6, 1:27 PM EST | Winter Weather Advisory | CTP | 25 hr |
| Feb 7, 5:32 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Feb 12, 4:11 AM EST | Winter Weather Advisory | CTP | 30 hr |
| Feb 26, 3:40 AM EST | Wind Advisory | CTP | 40 hr |
| Feb 26, 4:06 AM EST | Winter Weather Advisory | CTP | 38 hr |
| Feb 29, 6:45 AM EST | Special Weather Statement | CTP | 90 min |
| Mar 29, 12:05 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Mar 29, 2:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Mar 29, 2:56 PM EDT | Severe Thunderstorm Warning | CTP | 49 min |
| Apr 9, 6:58 PM EDT | Special Weather Statement | CTP | 92 min |
| Apr 12, 3:45 AM EDT | High Wind Watch | CTP | 9 hr |
| Apr 12, 12:43 PM EDT | Wind Advisory | CTP | 31 hr |
| Apr 15, 9:14 PM EDT | Special Weather Statement | CTP | 61 min |
| Apr 16, 2:55 PM EDT | Special Weather Statement | CTP | 110 min |
| Apr 17, 4:58 AM EDT | Winter Weather Advisory | CTP | 21 hr |
| Apr 17, 6:55 PM EDT | Mesoscale Discussion | SPC | 4 hr |
| May 15, 1:52 PM EDT | Mesoscale Discussion | SPC | 83 min |
| May 15, 2:20 PM EDT | Special Weather Statement | CTP | 55 min |
| May 15, 3:14 PM EDT | Special Weather Statement | CTP | 61 min |
| May 15, 7:11 PM EDT | Severe Thunderstorm Warning | CTP | 49 min |
| May 15, 7:47 PM EDT | Mesoscale Discussion | SPC | 58 min |
| May 15, 7:49 PM EDT | Severe Thunderstorm Warning | CTP | 41 min |
| May 20, 1:14 PM EDT | Frost Advisory | CTP | 18 hr |
| May 29, 10:47 AM EDT | Mesoscale Discussion | SPC | 118 min |
| May 29, 4:54 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 29, 5:37 PM EDT | Special Weather Statement | CTP | 23 min |
| May 29, 5:53 PM EDT | Special Weather Statement | CTP | 37 min |
| Jun 2, 9:26 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 3, 12:39 AM EDT | Severe Thunderstorm Warning | CTP | 96 min |
| Jun 3, 8:32 AM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 10, 10:20 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 22, 1:58 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 25, 5:47 PM EDT | Special Weather Statement | CTP | 28 min |
| Jul 12, 5:00 PM EDT | Special Weather Statement | CTP | 45 min |
| Jul 16, 1:20 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 16, 3:51 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 16, 7:51 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 19, 3:11 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jul 19, 3:50 PM EDT | Special Weather Statement | CTP | 40 min |
| Jul 19, 4:29 PM EDT | Special Weather Statement | CTP | 46 min |
| Jul 19, 4:49 PM EDT | Severe Thunderstorm Warning | CTP | 59 min |
| Jul 27, 4:31 PM EDT | Special Weather Statement | CTP | 29 min |
| Jul 29, 1:36 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 24, 4:05 PM EDT | Special Weather Statement | CTP | 25 min |
| Aug 25, 12:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Aug 25, 1:21 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 27, 2:49 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 27, 5:35 PM EDT | Severe Thunderstorm Warning | CTP | 55 min |
| Sep 18, 3:31 AM EDT | Freeze Watch | CTP | 10 hr |
| Sep 18, 1:03 PM EDT | Freeze Warning | CTP | 19 hr |
| Nov 14, 2:11 PM EST | Wind Advisory | CTP | 32 hr |
| Nov 15, 1:57 PM EST | Severe Thunderstorm Watch | SPC | 4 hr |
| Dec 9, 3:19 PM EST | Special Weather Statement | CTP | 86 min |
| Dec 14, 4:44 AM EST | Winter Storm Watch | CTP | 34 hr |
| Dec 15, 4:30 AM EST | Winter Storm Warning | CTP | 51 hr |
| Dec 20, 8:49 AM EST | Special Weather Statement | CTP | 56 min |
| Dec 22, 3:09 PM EST | Flood Watch | CTP | 69 hr |
| Dec 23, 3:02 PM EST | Winter Weather Advisory | CTP | 52 hr |
| Dec 24, 4:15 PM EST | Areal Flood Advisory | CTP | 4 hr |
| Dec 24, 7:59 PM EST | Areal Flood Advisory | CTP | 5 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 | 6 |
| Severe Thunderstorm Watch | 6 |
| Mesoscale Discussion | 15 |
| Special Weather Statement | 19 |
| Flooding | |
| Flood Watch | 1 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 8 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 1 |
| Wind and dust | |
| High Wind Watch | 2 |
| Wind Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.