Alert archive / Virginia / York County
Weather alerts in York County, Virginia, 2010
74 weather alerts in 2010, 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 2010. Tap one for its archive.
- Alerts
- 74
- Warnings
- 13
- Watches
- 14
- Advisories
- 6
- Busiest month
- August14 alerts
- Busiest day
- September 30, 201013 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 York County in 2010 had a tornado report inside them.
York 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 | 5 | 5 | 0% | 4 | 50% | 27 min |
| Flash flood warnings | 4 | 4 | 0% | 1 | 100% | 157 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Wakefield, VA: tornado warnings | 50 | 6 | 88% | 16 | 56% | 19 min |
| NWS Wakefield, VA: severe thunderstorm warnings | 170 | 133 | 22% | 362 | 82% | 23 min |
| NWS Wakefield, VA: flash flood warnings | 11 | 9 | 18% | 18 | 89% | 94 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 30, 8:10 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Mar 29, 1:54 AM EDT | Mesoscale Discussion | SPC | 36 min |
| Mar 29, 6:28 AM EDT | Areal Flood Advisory | AKQ | 3 hr |
| Mar 29, 9:30 AM EDT | Areal Flood Advisory | AKQ | 2 hr |
| Apr 9, 4:01 AM EDT | Mesoscale Discussion | SPC | 89 min |
| Apr 26, 6:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| May 12, 2:20 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 12, 6:13 PM EDT | Severe Thunderstorm Warning | AKQ | 47 min |
| May 14, 10:53 PM EDT | Severe Thunderstorm Warning | AKQ | 40 min |
| May 18, 12:46 AM EDT | Areal Flood Advisory | AKQ | 3 hr |
| May 23, 11:38 AM EDT | Special Weather Statement | AKQ | 52 min |
| Jun 3, 6:28 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 6, 9:11 PM EDT | Special Weather Statement | AKQ | 79 min |
| Jun 12, 3:10 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 13, 5:30 PM EDT | Special Weather Statement | AKQ | 60 min |
| Jun 14, 9:33 PM EDT | Special Weather Statement | AKQ | 57 min |
| Jun 16, 2:19 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 16, 4:07 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jun 26, 1:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jul 12, 7:10 AM EDT | Special Weather Statement | AKQ | 65 min |
| Jul 12, 7:36 AM EDT | Areal Flood Advisory | AKQ | 114 min |
| Jul 19, 5:53 PM EDT | Special Weather Statement | AKQ | 52 min |
| Jul 20, 12:49 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jul 29, 11:36 AM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 29, 11:54 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 29, 4:20 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 29, 6:12 PM EDT | Flash Flood Warning | AKQ | 93 min |
| Jul 29, 6:29 PM EDT | Tornado Warning | AKQ | 31 min |
| Aug 4, 8:36 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 5, 1:19 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 5, 3:56 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Aug 5, 5:39 PM EDT | Special Weather Statement | AKQ | 66 min |
| Aug 5, 6:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Aug 5, 6:59 PM EDT | Severe Thunderstorm Warning | AKQ | 46 min |
| Aug 5, 7:43 PM EDT | Severe Thunderstorm Warning | AKQ | 62 min |
| Aug 6, 9:21 PM EDT | Special Weather Statement | AKQ | 69 min |
| Aug 12, 9:29 AM EDT | Mesoscale Discussion | SPC | 91 min |
| Aug 12, 10:34 AM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 12, 12:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Aug 12, 4:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Aug 16, 2:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 17, 7:53 PM EDT | Special Weather Statement | AKQ | 52 min |
| Sep 28, 8:00 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 29, 9:39 PM EDT | Tornado Watch | SPC | 7 hr |
| Sep 30, 12:59 AM EDT | Tornado Warning | AKQ | 31 min |
| Sep 30, 1:39 AM EDT | Areal Flood Advisory | AKQ | 81 min |
| Sep 30, 3:01 AM EDT | Areal Flood Advisory | AKQ | 89 min |
| Sep 30, 4:02 AM EDT | Mesoscale Discussion | SPC | 118 min |
| Sep 30, 4:55 AM EDT | Tornado Watch | SPC | 8 hr |
| Sep 30, 5:25 AM EDT | Flash Flood Warning | AKQ | 3 hr |
| Sep 30, 7:43 AM EDT | Flash Flood Warning | AKQ | 3 hr |
| Sep 30, 8:25 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Sep 30, 8:37 AM EDT | Flash Flood Warning | AKQ | 3 hr |
| Sep 30, 10:43 AM EDT | Areal Flood Warning | AKQ | 12 hr |
| Sep 30, 10:49 AM EDT | Mesoscale Discussion | SPC | 116 min |
| Sep 30, 5:43 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Oct 1, 12:01 AM EDT | Mesoscale Discussion | SPC | 89 min |
| Oct 25, 12:34 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Oct 27, 2:44 AM EDT | Tornado Watch | SPC | 7 hr |
| Oct 27, 5:28 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 27, 12:13 PM EDT | Tornado Watch | SPC | 8 hr |
| Oct 27, 3:21 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Oct 27, 7:16 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Oct 27, 7:46 PM EDT | Tornado Watch | SPC | 8 hr |
| Oct 27, 9:39 PM EDT | Tornado Warning | AKQ | 51 min |
| Oct 27, 10:41 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Oct 28, 12:54 AM EDT | Mesoscale Discussion | SPC | 66 min |
| Nov 17, 1:43 AM EST | Severe Thunderstorm Warning | AKQ | 48 min |
| Dec 1, 2:13 AM EST | Tornado Watch | SPC | 8 hr |
| Dec 1, 4:25 AM EST | Mesoscale Discussion | SPC | 2 hr |
| Dec 1, 5:18 AM EST | Mesoscale Discussion | SPC | 117 min |
| Dec 1, 7:51 AM EST | Mesoscale Discussion | SPC | 84 min |
| Dec 16, 11:00 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 26, 4:09 AM EST | Mesoscale Discussion | SPC | 6 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.