Alert archive / Virginia / Orange County
Weather alerts in Orange County, Virginia, 2021
129 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Orange County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 129
- Warnings
- 51
- Watches
- 27
- Advisories
- 20
- Busiest month
- August32 alerts
- Busiest day
- June 3, 20217 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 1 tornado warnings covering Orange County in 2021 had a tornado report inside them.
Orange County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 37 | 26 | 30% | 26 | 85% | 18 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Baltimore/Washington: tornado warnings | 49 | 10 | 80% | 13 | 100% | 11 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 544 | 396 | 27% | 1,446 | 83% | 20 min |
| NWS Baltimore/Washington: flash flood warnings | 76 | 32 | 58% | 96 | 77% | 60 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 15, 10:46 PM EST | Dense Fog Advisory | LWX | 9 hr |
| Jan 26, 8:18 PM EST | Dense Fog Advisory | LWX | 13 hr |
| Jan 29, 3:10 PM EST | Winter Storm Watch | LWX | 23 hr |
| Jan 30, 9:02 AM EST | Winter Storm Warning | LWX | 69 hr |
| Jan 31, 5:12 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 31, 6:50 PM EST | Winter Weather Advisory | LWX | 42 hr |
| Feb 5, 3:13 PM EST | Winter Storm Watch | LWX | 12 hr |
| Feb 6, 3:22 AM EST | Winter Storm Warning | LWX | 33 hr |
| Feb 7, 4:24 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 10, 3:33 AM EST | Winter Storm Watch | LWX | 24 hr |
| Feb 11, 3:28 AM EST | Winter Weather Advisory | LWX | 30 hr |
| Feb 11, 6:08 PM EST | Winter Storm Watch | LWX | 21 hr |
| Feb 12, 3:10 PM EST | Ice Storm Warning | LWX | 30 hr |
| Feb 12, 3:10 PM EST | Winter Weather Advisory | LWX | 43 hr |
| Feb 13, 10:02 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 16, 4:56 AM EST | Winter Storm Watch | LWX | 29 hr |
| Feb 17, 3:24 AM EST | Winter Storm Warning | LWX | 57 hr |
| Feb 18, 4:28 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 18, 10:23 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Feb 21, 3:17 PM EST | Winter Weather Advisory | LWX | 24 hr |
| Feb 28, 9:09 PM EST | Dense Fog Advisory | LWX | 8 hr |
| Mar 10, 3:43 PM EST | Fire Weather Watch | LWX | 12 hr |
| Mar 11, 3:28 AM EST | Red Flag Warning | LWX | 15 hr |
| Mar 24, 9:09 PM EDT | Dense Fog Advisory | LWX | 14 hr |
| Mar 25, 2:41 PM EDT | Wind Advisory | LWX | 27 hr |
| Mar 28, 1:24 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 10, 4:55 AM EDT | Dense Fog Advisory | LWX | 4 hr |
| Apr 11, 4:54 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 16, 11:59 AM EDT | Frost Advisory | LWX | 21 hr |
| Apr 22, 12:03 PM EDT | Freeze Warning | LWX | 20 hr |
| Apr 24, 2:37 AM EDT | Frost Advisory | LWX | 5 hr |
| Apr 30, 12:24 PM EDT | Red Flag Warning | LWX | 7 hr |
| May 4, 1:04 PM EDT | Mesoscale Discussion | SPC | 56 min |
| May 4, 1:51 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 4, 3:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| May 4, 4:41 PM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| May 5, 1:03 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 17, 2:51 AM EDT | Dense Fog Advisory | LWX | 7 hr |
| May 26, 1:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| May 26, 2:48 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 28, 3:56 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 3, 1:46 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jun 3, 2:48 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 3, 3:56 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| Jun 3, 4:45 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Jun 3, 4:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 3, 5:19 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| Jun 3, 5:32 PM EDT | Severe Thunderstorm Warning | LWX | 43 min |
| Jun 4, 12:39 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Jun 4, 12:46 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jun 4, 12:59 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 4, 1:10 PM EDT | Severe Thunderstorm Warning | LWX | 36 min |
| Jun 10, 2:53 AM EDT | Flash Flood Watch | LWX | 43 hr |
| Jun 10, 7:18 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| Jun 11, 8:59 AM EDT | Areal Flood Warning | LWX | 7 hr |
| Jun 11, 2:15 PM EDT | River Flood Warning | LWX | 3 hr |
| Jun 14, 6:41 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 21, 1:51 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jun 30, 2:23 PM EDT | Flash Flood Watch | LWX | 42 hr |
| Jul 1, 11:45 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 1, 12:46 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 14, 3:04 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| Jul 14, 3:24 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 3:37 PM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Jul 14, 4:06 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Jul 14, 4:20 PM EDT | Severe Thunderstorm Warning | LWX | 40 min |
| Jul 14, 5:12 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Jul 15, 6:09 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Jul 17, 12:45 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Jul 17, 1:13 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jul 17, 1:42 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Jul 17, 2:19 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| Jul 17, 3:09 PM EDT | Severe Thunderstorm Warning | LWX | 23 min |
| Jul 17, 4:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jul 17, 6:54 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 29, 3:00 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 8, 4:38 AM EDT | Dense Fog Advisory | LWX | 4 hr |
| Aug 10, 2:30 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 10, 3:24 PM EDT | Severe Thunderstorm Warning | LWX | 34 min |
| Aug 11, 1:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 11, 2:02 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 11, 3:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Aug 11, 3:50 PM EDT | Severe Thunderstorm Warning | LWX | 29 min |
| Aug 12, 2:15 AM EDT | Heat Advisory | LWX | 18 hr |
| Aug 12, 6:04 PM EDT | Heat Advisory | LWX | 25 hr |
| Aug 13, 12:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Aug 13, 1:11 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 13, 3:05 PM EDT | Severe Thunderstorm Warning | LWX | 25 min |
| Aug 13, 3:30 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Aug 13, 3:35 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Aug 13, 3:53 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| Aug 14, 1:10 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 14, 4:03 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| Aug 14, 6:14 PM EDT | Flash Flood Watch | LWX | 10 hr |
| Aug 17, 1:54 PM EDT | Flash Flood Watch | LWX | 27 hr |
| Aug 19, 2:11 PM EDT | Flash Flood Watch | LWX | 28 hr |
| Aug 27, 1:41 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 28, 1:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 28, 7:37 PM EDT | Severe Thunderstorm Warning | LWX | 53 min |
| Aug 28, 8:03 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| Aug 28, 8:27 PM EDT | Severe Thunderstorm Warning | LWX | 32 min |
| Aug 28, 8:38 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| Aug 28, 8:44 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Aug 28, 9:07 PM EDT | Areal Flood Warning | LWX | 3 hr |
| Aug 30, 4:54 AM EDT | Flash Flood Watch | LWX | 62 hr |
| Aug 30, 11:48 AM EDT | Flash Flood Watch | LWX | 6 hr |
| Aug 30, 4:51 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 31, 7:36 PM EDT | Tornado Watch | SPC | 7 hr |
| Aug 31, 11:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Sep 1, 12:18 AM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| Sep 1, 12:25 AM EDT | Tornado Warning | LWX | 35 min |
| Sep 1, 12:53 AM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| Sep 1, 1:09 AM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Sep 1, 11:46 AM EDT | Tornado Watch | SPC | 9 hr |
| Sep 28, 4:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Sep 28, 5:27 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Sep 28, 5:32 PM EDT | Severe Thunderstorm Warning | LWX | 43 min |
| Sep 28, 5:40 PM EDT | Severe Thunderstorm Warning | LWX | 50 min |
| Oct 5, 12:37 AM EDT | Dense Fog Advisory | LWX | 9 hr |
| Oct 5, 11:59 AM EDT | Flood Watch | LWX | 14 hr |
| Oct 13, 3:53 AM EDT | Dense Fog Advisory | LWX | 7 hr |
| Oct 14, 2:36 AM EDT | Dense Fog Advisory | LWX | 7 hr |
| Oct 25, 6:11 PM EDT | Severe Thunderstorm Warning | LWX | 34 min |
| Oct 25, 6:26 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Oct 25, 7:23 PM EDT | Severe Thunderstorm Warning | LWX | 21 min |
| Oct 29, 4:03 PM EDT | Areal Flood Warning | LWX | 5 hr |
| Oct 31, 4:26 AM EDT | Dense Fog Advisory | LWX | 3 hr |
| Nov 1, 3:03 AM EDT | Freeze Watch | LWX | 24 hr |
| Nov 2, 3:22 AM EDT | Freeze Warning | LWX | 30 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 | 37 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 10 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 31 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 1 |
| River Flood Warning | 1 |
| Flash Flood Watch | 7 |
| Flood Watch | 1 |
| Winter | |
| Ice Storm Warning | 1 |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 4 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 1 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 11 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.