Alert archive / Virginia / Spotsylvania County
Weather alerts in Spotsylvania County, Virginia, 2017
77 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Spotsylvania County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 77
- Warnings
- 23
- Watches
- 14
- Advisories
- 16
- Busiest month
- July19 alerts
- Busiest day
- February 25, 20175 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 2 tornado warnings covering Spotsylvania County in 2017 had a tornado report inside them.
Spotsylvania County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 18 | 14 | 22% | 12 | 83% | 17 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Baltimore/Washington: tornado warnings | 11 | 4 | 64% | 18 | 33% | 7 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 261 | 194 | 26% | 976 | 81% | 19 min |
| NWS Baltimore/Washington: flash flood warnings | 49 | 34 | 31% | 130 | 81% | 78 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 6, 8:48 AM EST | Winter Weather Advisory | LWX | 30 hr |
| Jan 29, 3:42 AM EST | Winter Weather Advisory | LWX | 33 hr |
| Feb 25, 12:24 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Feb 25, 1:30 PM EST | Severe Thunderstorm Watch | SPC | 6 hr |
| Feb 25, 1:33 PM EST | Severe Thunderstorm Warning | LWX | 42 min |
| Feb 25, 2:02 PM EST | Severe Thunderstorm Warning | LWX | 43 min |
| Feb 25, 2:27 PM EST | Severe Thunderstorm Warning | LWX | 48 min |
| Mar 1, 9:44 AM EST | Mesoscale Discussion | SPC | 91 min |
| Mar 1, 10:38 AM EST | Severe Thunderstorm Watch | SPC | 4 hr |
| Mar 1, 1:05 PM EST | Severe Thunderstorm Warning | LWX | 40 min |
| Mar 1, 1:36 PM EST | Severe Thunderstorm Warning | LWX | 54 min |
| Mar 13, 4:00 AM EDT | Winter Weather Advisory | LWX | 34 hr |
| Mar 21, 10:00 AM EDT | Special Weather Statement | LWX | 15 min |
| Mar 27, 4:37 AM EDT | Dense Fog Advisory | LWX | 5 hr |
| Apr 6, 5:59 AM EDT | Mesoscale Discussion | SPC | 91 min |
| Apr 6, 12:17 PM EDT | Severe Thunderstorm Warning | LWX | 29 min |
| Apr 6, 12:18 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Apr 6, 12:43 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| Apr 6, 12:45 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 8, 2:10 PM EDT | Frost Advisory | LWX | 18 hr |
| Apr 21, 4:19 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Apr 30, 3:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| May 1, 5:54 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 1, 8:28 PM EDT | Mesoscale Discussion | SPC | 92 min |
| May 5, 6:14 AM EDT | Severe Thunderstorm Warning | LWX | 31 min |
| May 5, 7:49 AM EDT | Severe Thunderstorm Warning | LWX | 56 min |
| May 5, 6:15 PM EDT | Mesoscale Discussion | SPC | 90 min |
| May 19, 3:25 PM EDT | Severe Thunderstorm Warning | LWX | 50 min |
| May 19, 4:49 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| May 19, 5:34 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| May 25, 12:59 PM EDT | Mesoscale Discussion | SPC | 61 min |
| May 27, 4:16 PM EDT | Mesoscale Discussion | SPC | 89 min |
| May 27, 4:43 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 27, 6:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| May 30, 5:56 PM EDT | Mesoscale Discussion | SPC | 64 min |
| May 30, 7:07 PM EDT | Severe Thunderstorm Warning | LWX | 53 min |
| May 31, 1:58 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 14, 1:17 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 19, 4:09 AM EDT | Flash Flood Watch | LWX | 14 hr |
| Jun 19, 12:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 19, 12:48 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 19, 2:21 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jul 6, 6:20 AM EDT | Flash Flood Watch | LWX | 20 hr |
| Jul 6, 6:40 PM EDT | Tornado Warning | LWX | 8 min |
| Jul 6, 6:47 PM EDT | Severe Thunderstorm Warning | LWX | 43 min |
| Jul 6, 7:14 PM EDT | Severe Thunderstorm Warning | LWX | 33 min |
| Jul 12, 3:05 PM EDT | Heat Advisory | LWX | 28 hr |
| Jul 13, 3:03 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jul 14, 12:12 PM EDT | Heat Advisory | LWX | 6 hr |
| Jul 14, 1:09 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 1:40 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 14, 4:23 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jul 20, 3:21 AM EDT | Heat Advisory | LWX | 16 hr |
| Jul 20, 8:30 PM EDT | Heat Advisory | LWX | 23 hr |
| Jul 22, 3:09 AM EDT | Heat Advisory | LWX | 16 hr |
| Jul 22, 6:09 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Jul 22, 6:16 PM EDT | Tornado Warning | LWX | 29 min |
| Jul 22, 7:11 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jul 22, 10:32 PM EDT | Severe Thunderstorm Warning | LWX | 43 min |
| Jul 24, 6:09 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 27, 1:47 PM EDT | Flash Flood Watch | LWX | 48 hr |
| Aug 2, 2:44 PM EDT | Special Weather Statement | AKQ | 46 min |
| Aug 6, 5:29 PM EDT | Flash Flood Watch | LWX | 23 hr |
| Aug 15, 11:47 AM EDT | Areal Flood Warning | LWX | 118 min |
| Aug 15, 10:31 PM EDT | Dense Fog Advisory | LWX | 11 hr |
| Aug 18, 3:42 AM EDT | Heat Advisory | LWX | 15 hr |
| Aug 18, 12:35 PM EDT | Flash Flood Watch | LWX | 8 hr |
| Aug 18, 2:27 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 21, 2:53 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 21, 6:18 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| Oct 17, 1:39 PM EDT | Frost Advisory | LWX | 19 hr |
| Oct 23, 6:31 PM EDT | Wind Advisory | LWX | 10 hr |
| Oct 26, 3:53 AM EDT | Frost Advisory | LWX | 29 hr |
| Nov 9, 2:17 AM EST | Freeze Watch | LWX | 24 hr |
| Nov 10, 2:41 AM EST | Freeze Warning | LWX | 31 hr |
| Dec 8, 5:50 AM EST | Winter Weather Advisory | LWX | 51 hr |
| Dec 8, 2:52 PM EST | Winter Storm Warning | LWX | 25 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 | 18 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 8 |
| Mesoscale Discussion | 22 |
| Special Weather Statement | 2 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Watch | 5 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Weather Advisory | 4 |
| Heat | |
| Heat Advisory | 6 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.