Alert archive / Pennsylvania / Jefferson County
Weather alerts in Jefferson County, Pennsylvania, 2010
141 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Jefferson County and its neighbors
Each county as a circle sized by its count in 2010. Tap one for its archive.
- Alerts
- 141
- Warnings
- 28
- Watches
- 31
- Advisories
- 24
- Busiest month
- June34 alerts
- Busiest day
- June 6, 20109 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 Jefferson County in 2010 had a tornado report inside them.
Jefferson County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 17 | 10 | 41% | 6 | 67% | 30 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pittsburgh, PA: tornado warnings | 13 | 1 | 92% | 4 | 25% | 4 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 204 | 124 | 39% | 290 | 82% | 26 min |
| NWS Pittsburgh, PA: flash flood warnings | 24 | 15 | 38% | 29 | 90% | 73 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 1, 2:11 PM EST | Winter Weather Advisory | PBZ | 5 days |
| Jan 2, 2:24 PM EST | Wind Chill Advisory | PBZ | 43 hr |
| Jan 6, 8:56 AM EST | Winter Weather Advisory | PBZ | 3 hr |
| Jan 6, 3:27 PM EST | Winter Weather Advisory | PBZ | 67 hr |
| Jan 21, 2:31 PM EST | Winter Weather Advisory | PBZ | 22 hr |
| Jan 24, 4:34 AM EST | Flood Watch | PBZ | 38 hr |
| Jan 24, 9:54 PM EST | River Flood Watch | PBZ | 14 hr |
| Jan 25, 7:51 AM EST | Areal Flood Advisory | PBZ | 9 hr |
| Jan 25, 11:50 AM EST | River Flood Warning | PBZ | 19 hr |
| Jan 28, 9:41 AM EST | Winter Weather Advisory | PBZ | 6 hr |
| Feb 4, 2:31 PM EST | Winter Storm Warning | PBZ | 50 hr |
| Feb 4, 2:31 PM EST | Winter Weather Advisory | PBZ | 31 hr |
| Feb 7, 3:04 PM EST | Winter Storm Watch | PBZ | 24 hr |
| Feb 8, 3:19 PM EST | Winter Storm Warning | PBZ | 54 hr |
| Feb 14, 4:52 PM EST | Winter Weather Advisory | PBZ | 4 days |
| Feb 15, 1:41 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 18, 12:05 PM EST | Winter Weather Advisory | PBZ | 4 hr |
| Feb 22, 7:35 PM EST | Freezing Rain Advisory | PBZ | 4 hr |
| Feb 24, 4:13 PM EST | Winter Storm Watch | PBZ | 11 hr |
| Feb 25, 2:54 AM EST | Winter Weather Advisory | PBZ | 50 hr |
| Mar 10, 4:19 AM EST | Flood Watch | PBZ | 4 days |
| Mar 13, 7:41 AM EST | River Flood Watch | PBZ | 7 hr |
| Mar 13, 7:41 AM EST | River Flood Watch | PBZ | 7 hr |
| Mar 22, 6:53 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 3, 3:50 AM EDT | Fire Weather Watch | PBZ | 12 hr |
| Apr 3, 10:18 AM EDT | Red Flag Warning | PBZ | 10 hr |
| Apr 6, 5:20 AM EDT | Mesoscale Discussion | SPC | 85 min |
| Apr 7, 10:01 AM EDT | Red Flag Warning | PBZ | 9 hr |
| Apr 16, 12:44 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 16, 1:28 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 16, 4:03 PM EDT | Severe Thunderstorm Warning | PBZ | 57 min |
| Apr 16, 4:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Apr 16, 6:14 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Apr 25, 11:54 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 25, 2:26 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Apr 25, 4:37 PM EDT | Severe Thunderstorm Warning | PBZ | 38 min |
| Apr 25, 5:22 PM EDT | Severe Thunderstorm Warning | PBZ | 38 min |
| May 7, 2:38 PM EDT | Wind Advisory | PBZ | 30 hr |
| May 7, 9:31 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 7, 11:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| May 8, 3:04 PM EDT | Freeze Watch | PBZ | 12 hr |
| May 9, 3:22 AM EDT | Freeze Warning | PBZ | 29 hr |
| May 10, 3:28 PM EDT | Freeze Warning | PBZ | 14 hr |
| May 14, 5:14 AM EDT | Severe Thunderstorm Warning | PBZ | 61 min |
| May 23, 2:11 AM EDT | Dense Fog Advisory | PBZ | 7 hr |
| May 28, 3:50 PM EDT | Special Weather Statement | PBZ | 40 min |
| May 31, 3:20 PM EDT | Flash Flood Watch | PBZ | 12 hr |
| May 31, 5:10 PM EDT | Severe Thunderstorm Warning | PBZ | 50 min |
| Jun 2, 1:39 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 2, 4:14 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jun 4, 1:14 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 4, 4:35 PM EDT | Special Weather Statement | PBZ | 40 min |
| Jun 4, 4:38 PM EDT | Severe Thunderstorm Warning | PBZ | 37 min |
| Jun 5, 3:15 AM EDT | Flash Flood Watch | PBZ | 32 hr |
| Jun 5, 2:08 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 5, 3:13 PM EDT | Tornado Watch | SPC | 4 hr |
| Jun 6, 2:03 AM EDT | Tornado Watch | SPC | 7 hr |
| Jun 6, 3:38 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 6, 7:05 AM EDT | Mesoscale Discussion | SPC | 115 min |
| Jun 6, 7:12 AM EDT | Severe Thunderstorm Warning | PBZ | 48 min |
| Jun 6, 7:19 AM EDT | Tornado Warning | PBZ | 41 min |
| Jun 6, 7:51 AM EDT | Tornado Watch | SPC | 7 hr |
| Jun 6, 8:02 AM EDT | Tornado Warning | PBZ | 28 min |
| Jun 6, 8:47 AM EDT | Special Weather Statement | PBZ | 43 min |
| Jun 6, 8:54 AM EDT | Severe Thunderstorm Warning | PBZ | 21 min |
| Jun 16, 1:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 19, 6:04 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jun 22, 8:19 AM EDT | Special Weather Statement | PBZ | 41 min |
| Jun 22, 11:35 AM EDT | Mesoscale Discussion | SPC | 25 min |
| Jun 22, 3:48 PM EDT | Mesoscale Discussion | SPC | 27 min |
| Jun 23, 1:37 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 23, 6:27 PM EDT | Severe Thunderstorm Warning | PBZ | 63 min |
| Jun 23, 6:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 24, 9:15 AM EDT | Special Weather Statement | PBZ | 30 min |
| Jun 24, 9:38 AM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 24, 10:04 AM EDT | Special Weather Statement | PBZ | 26 min |
| Jun 24, 10:19 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 24, 12:16 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 27, 3:49 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 27, 8:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 28, 5:37 PM EDT | Special Weather Statement | PBZ | 53 min |
| Jun 28, 6:11 PM EDT | Special Weather Statement | PBZ | 19 min |
| Jul 9, 3:59 PM EDT | Special Weather Statement | PBZ | 61 min |
| Jul 9, 4:21 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jul 9, 4:49 PM EDT | Special Weather Statement | PBZ | 56 min |
| Jul 13, 10:08 PM EDT | Flash Flood Watch | PBZ | 5 hr |
| Jul 17, 9:17 PM EDT | Severe Thunderstorm Warning | PBZ | 58 min |
| Jul 19, 2:23 PM EDT | Special Weather Statement | PBZ | 52 min |
| Jul 21, 2:45 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 21, 3:41 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jul 23, 12:46 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 23, 5:04 PM EDT | Special Weather Statement | PBZ | 26 min |
| Jul 23, 5:51 PM EDT | Severe Thunderstorm Warning | PBZ | 39 min |
| Jul 23, 6:23 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jul 23, 6:42 PM EDT | Special Weather Statement | PBZ | 48 min |
| Jul 23, 9:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 23, 10:29 PM EDT | Special Weather Statement | PBZ | 61 min |
| Jul 23, 10:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jul 23, 11:33 PM EDT | Special Weather Statement | PBZ | 57 min |
| Jul 24, 6:10 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 24, 7:41 PM EDT | Tornado Warning | PBZ | 34 min |
| Jul 24, 7:58 PM EDT | Severe Thunderstorm Warning | PBZ | 32 min |
| Jul 24, 8:14 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| Jul 24, 8:41 PM EDT | Severe Thunderstorm Warning | PBZ | 64 min |
| Jul 28, 9:04 PM EDT | Special Weather Statement | PBZ | 56 min |
| Jul 28, 9:11 PM EDT | Severe Thunderstorm Warning | PBZ | 49 min |
| Aug 4, 5:14 PM EDT | Special Weather Statement | PBZ | 31 min |
| Aug 4, 5:37 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Aug 4, 10:08 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 4, 11:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Aug 5, 7:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 16, 6:04 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Sep 22, 1:26 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Sep 22, 2:07 PM EDT | Severe Thunderstorm Warning | PBZ | 38 min |
| Sep 22, 2:34 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 28, 5:57 AM EDT | Special Weather Statement | PBZ | 63 min |
| Sep 28, 6:57 AM EDT | Special Weather Statement | PBZ | 63 min |
| Oct 11, 1:01 PM EDT | Special Weather Statement | PBZ | 59 min |
| Oct 11, 3:19 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Oct 12, 3:04 AM EDT | Frost Advisory | PBZ | 30 hr |
| Oct 16, 6:34 PM EDT | Frost Advisory | PBZ | 8 hr |
| Oct 26, 3:40 AM EDT | Wind Advisory | PBZ | 15 hr |
| Oct 26, 1:09 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Oct 26, 1:36 PM EDT | Tornado Watch | SPC | 7 hr |
| Oct 26, 5:25 PM EDT | Severe Thunderstorm Warning | PBZ | 50 min |
| Oct 26, 5:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Oct 26, 6:11 PM EDT | Special Weather Statement | PBZ | 49 min |
| Nov 16, 8:48 PM EST | Special Weather Statement | PBZ | 42 min |
| Nov 17, 1:10 AM EST | Special Weather Statement | PBZ | 110 min |
| Nov 23, 4:16 AM EST | Special Weather Statement | PBZ | 59 min |
| Nov 23, 5:15 AM EST | Special Weather Statement | PBZ | 60 min |
| Nov 24, 3:14 PM EST | Winter Weather Advisory | PBZ | 19 hr |
| Nov 25, 5:02 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Nov 29, 1:09 PM EST | Flood Watch | PBZ | 39 hr |
| Nov 29, 1:09 PM EST | Wind Advisory | PBZ | 32 hr |
| Dec 1, 2:49 AM EST | River Flood Warning | PBZ | 30 hr |
| Dec 1, 7:54 AM EST | Areal Flood Advisory | PBZ | 6 hr |
| Dec 5, 3:14 AM EST | Winter Weather Advisory | PBZ | 64 hr |
| Dec 10, 2:34 PM EST | Winter Storm Watch | PBZ | 38 hr |
| Dec 12, 3:43 AM EST | Winter Weather Advisory | PBZ | 63 hr |
| Dec 29, 10:30 PM EST | Freezing Rain Advisory | PBZ | 13 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 archive20092011
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.