Alert archive / Pennsylvania / Somerset County
Weather alerts in Somerset County, Pennsylvania, 2020
116 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Somerset County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 116
- Warnings
- 26
- Watches
- 15
- Advisories
- 31
- Busiest month
- July23 alerts
- Busiest day
- March 28, 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.
Somerset County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 17 | 11 | 35% | 35 | 66% | 32 min |
| Flash flood warnings | 1 | 1 | 0% | 2 | 100% | 33 min |
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 7, 2:01 AM EST | Winter Weather Advisory | CTP | 17 hr |
| Jan 8, 5:13 AM EST | Special Weather Statement | CTP | 62 min |
| Jan 8, 6:40 AM EST | Special Weather Statement | CTP | 65 min |
| Jan 8, 7:07 AM EST | Snow Squall Warning | CTP | 23 min |
| Jan 11, 4:07 AM EST | High Wind Watch | CTP | 10 hr |
| Jan 11, 4:07 AM EST | Wind Advisory | CTP | 30 hr |
| Jan 15, 2:23 PM EST | Wind Advisory | CTP | 29 hr |
| Jan 16, 5:01 PM EST | Special Weather Statement | CTP | 59 min |
| Jan 16, 5:57 PM EST | Special Weather Statement | CTP | 63 min |
| Jan 17, 3:01 PM EST | Winter Weather Advisory | CTP | 30 hr |
| 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, 12:37 PM EST | Winter Weather Advisory | CTP | 6 hr |
| Feb 13, 10:53 PM EST | Special Weather Statement | CTP | 2 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 26, 2:49 PM EST | Mesoscale Discussion | SPC | 116 min |
| Feb 26, 7:10 PM EST | Special Weather Statement | CTP | 35 min |
| Mar 3, 1:22 PM EST | Mesoscale Discussion | SPC | 113 min |
| Mar 3, 4:27 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Mar 3, 8:57 PM EST | Special Weather Statement | CTP | 63 min |
| Mar 14, 5:17 PM EDT | Winter Weather Advisory | CTP | 15 hr |
| Mar 28, 5:20 PM EDT | Special Weather Statement | CTP | 25 min |
| Mar 28, 5:30 PM EDT | Severe Thunderstorm Warning | CTP | 30 min |
| Mar 28, 5:39 PM EDT | Areal Flood Advisory | CTP | 51 min |
| Mar 28, 5:51 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Mar 28, 6:00 PM EDT | Special Weather Statement | CTP | 30 min |
| Mar 28, 6:29 PM EDT | Areal Flood Advisory | CTP | 2 hr |
| Mar 28, 10:43 PM EDT | Areal Flood Advisory | CTP | 2 hr |
| Apr 8, 1:44 AM EDT | Severe Thunderstorm Warning | CTP | 61 min |
| Apr 8, 1:52 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Apr 9, 10:29 AM EDT | Special Weather Statement | CTP | 46 min |
| Apr 12, 3:45 AM EDT | High Wind Watch | CTP | 9 hr |
| Apr 12, 12:43 PM EDT | High Wind Warning | CTP | 31 hr |
| Apr 12, 12:43 PM EDT | Wind Advisory | CTP | 31 hr |
| Apr 13, 11:33 AM EDT | Tornado Watch | SPC | 5 hr |
| Apr 13, 11:48 AM EDT | Severe Thunderstorm Warning | CTP | 72 min |
| Apr 15, 9:14 PM EDT | Special Weather Statement | CTP | 61 min |
| Apr 15, 10:01 PM EDT | Special Weather Statement | CTP | 44 min |
| May 7, 1:44 PM EDT | Freeze Warning | CTP | 44 hr |
| May 9, 5:04 AM EDT | Freeze Warning | CTP | 27 hr |
| May 10, 1:35 PM EDT | Freeze Watch | CTP | 13 hr |
| May 11, 2:58 AM EDT | Freeze Warning | CTP | 30 hr |
| May 11, 3:09 PM EDT | Freeze Watch | CTP | 19 hr |
| May 12, 10:20 AM EDT | Freeze Warning | CTP | 22 hr |
| Jun 3, 3:10 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 4, 2:29 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 4, 4:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jun 4, 6:32 PM EDT | Special Weather Statement | CTP | 73 min |
| Jun 21, 2:44 PM EDT | Special Weather Statement | CTP | 31 min |
| Jun 22, 12:44 PM EDT | Special Weather Statement | CTP | 61 min |
| Jun 22, 1:04 PM EDT | Flash Flood Watch | CTP | 6 hr |
| Jun 22, 1:27 PM EDT | Severe Thunderstorm Warning | CTP | 48 min |
| Jun 22, 1:58 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 23, 1:52 PM EDT | Flash Flood Watch | CTP | 8 hr |
| Jul 5, 6:21 PM EDT | Special Weather Statement | CTP | 39 min |
| Jul 5, 6:33 PM EDT | Severe Thunderstorm Warning | CTP | 27 min |
| Jul 5, 6:59 PM EDT | Special Weather Statement | CTP | 31 min |
| Jul 5, 8:32 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 8, 5:03 PM EDT | Areal Flood Advisory | CTP | 117 min |
| Jul 8, 5:23 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Jul 10, 6:34 PM EDT | Special Weather Statement | CTP | 56 min |
| Jul 10, 7:26 PM EDT | Areal Flood Advisory | CTP | 2 hr |
| Jul 16, 1:20 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 16, 2:34 PM EDT | Special Weather Statement | CTP | 26 min |
| Jul 16, 3:02 PM EDT | Severe Thunderstorm Warning | CTP | 43 min |
| Jul 16, 3:15 PM EDT | Special Weather Statement | CTP | 45 min |
| Jul 21, 12:15 PM EDT | Special Weather Statement | CTP | 45 min |
| Jul 21, 2:59 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 21, 3:00 PM EDT | Special Weather Statement | PBZ | 30 min |
| Jul 21, 3:18 PM EDT | Severe Thunderstorm Warning | CTP | 42 min |
| Jul 21, 3:47 PM EDT | Severe Thunderstorm Warning | CTP | 43 min |
| Jul 21, 4:03 PM EDT | Special Weather Statement | CTP | 42 min |
| Jul 22, 10:48 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 22, 12:01 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 22, 12:02 PM EDT | Special Weather Statement | CTP | 28 min |
| Jul 27, 9:25 PM EDT | Special Weather Statement | CTP | 35 min |
| Jul 27, 9:39 PM EDT | Special Weather Statement | CTP | 36 min |
| Aug 12, 8:45 PM EDT | Areal Flood Advisory | CTP | 60 min |
| Aug 21, 6:33 PM EDT | Special Weather Statement | CTP | 57 min |
| Aug 21, 7:05 PM EDT | Areal Flood Advisory | CTP | 115 min |
| Aug 25, 8:23 AM EDT | Severe Thunderstorm Warning | CTP | 82 min |
| Aug 25, 9:48 AM EDT | Special Weather Statement | CTP | 27 min |
| Aug 25, 1:21 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 25, 3:00 PM EDT | Severe Thunderstorm Warning | CTP | 75 min |
| Aug 25, 4:21 PM EDT | Severe Thunderstorm Warning | CTP | 84 min |
| Aug 25, 4:35 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Aug 27, 2:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 27, 5:32 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 27, 6:35 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 27, 6:47 PM EDT | Severe Thunderstorm Warning | CTP | 58 min |
| Aug 27, 7:09 PM EDT | Severe Thunderstorm Warning | CTP | 66 min |
| Aug 27, 8:05 PM EDT | Severe Thunderstorm Warning | CTP | 70 min |
| Aug 28, 9:55 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 28, 12:28 PM EDT | Special Weather Statement | CTP | 47 min |
| Aug 28, 12:46 PM EDT | Severe Thunderstorm Warning | CTP | 59 min |
| Aug 28, 1:25 PM EDT | Special Weather Statement | CTP | 35 min |
| Aug 28, 1:29 PM EDT | Severe Thunderstorm Warning | CTP | 61 min |
| Sep 19, 12:53 PM EDT | Frost Advisory | CTP | 20 hr |
| Sep 20, 11:59 AM EDT | Frost Advisory | CTP | 21 hr |
| Sep 21, 1:35 PM EDT | Frost Advisory | CTP | 19 hr |
| Oct 2, 1:39 PM EDT | Frost Advisory | CTP | 19 hr |
| Oct 15, 7:29 PM EDT | Freeze Watch | CTP | 19 hr |
| Oct 16, 2:44 PM EDT | Freeze Warning | CTP | 17 hr |
| Nov 1, 4:10 AM EST | Winter Weather Advisory | CTP | 31 hr |
| Nov 14, 2:11 PM EST | Wind Advisory | CTP | 32 hr |
| Nov 15, 3:46 PM EST | Severe Thunderstorm Warning | CTP | 48 min |
| Nov 29, 8:10 PM EST | Winter Weather Advisory | CTP | 59 hr |
| Dec 13, 1:37 PM EST | Winter Weather Advisory | CTP | 25 hr |
| 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 16, 7:29 PM EST | Special Weather Statement | CTP | 61 min |
| Dec 21, 3:51 AM EST | Winter Weather Advisory | CTP | 30 hr |
| Dec 23, 3:48 AM EST | Winter Storm Watch | CTP | 30 hr |
| Dec 23, 3:02 PM EST | Winter Weather Advisory | CTP | 52 hr |
| Dec 31, 4:48 AM EST | Winter Weather Advisory | CTP | 103 min |
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 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.