Alert archive / Virginia / Clarke County
Weather alerts in Clarke County, Virginia, 2008
115 weather alerts in 2008, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Clarke County and its neighbors
Each county as a circle sized by its count in 2008. Tap one for its archive.
- Alerts
- 115
- Warnings
- 29
- Watches
- 28
- Advisories
- 28
- Busiest month
- June37 alerts
- Busiest day
- June 4, 20089 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 Clarke County in 2008 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.
Clarke County, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 1 | 0% | |
| Severe thunderstorm warnings | 19 | 11 | 42% | 4 | 100% | 10 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Baltimore/Washington: tornado warnings | 36 | 8 | 78% | 21 | 43% | 18 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 391 | 220 | 44% | 579 | 76% | 21 min |
| NWS Baltimore/Washington: flash flood warnings | 23 | 11 | 52% | 53 | 75% | 117 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 16, 2:35 PM EST | Winter Weather Advisory | LWX | 36 hr |
| Jan 16, 9:28 PM EST | Winter Storm Warning | LWX | 24 hr |
| Jan 17, 7:51 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 17, 12:53 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 21, 3:04 PM EST | Winter Weather Advisory | LWX | 22 hr |
| Jan 29, 3:18 PM EST | Wind Advisory | LWX | 20 hr |
| Jan 30, 2:58 PM EST | Winter Storm Watch | LWX | 24 hr |
| Jan 31, 3:03 PM EST | Winter Storm Warning | LWX | 21 hr |
| Feb 1, 7:36 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 6, 4:49 AM EST | Mesoscale Discussion | SPC | 86 min |
| Feb 9, 2:30 PM EST | High Wind Warning | LWX | 29 hr |
| Feb 9, 2:30 PM EST | Wind Advisory | LWX | 32 hr |
| Feb 10, 4:00 AM EST | Red Flag Warning | LWX | 18 hr |
| Feb 11, 8:58 PM EST | Winter Weather Advisory | LWX | 40 hr |
| Feb 12, 4:15 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 13, 1:31 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 19, 9:51 PM EST | Snow Advisory | LWX | 24 hr |
| Feb 20, 10:07 PM EST | Winter Storm Watch | LWX | 17 hr |
| Feb 21, 2:38 PM EST | Winter Storm Warning | LWX | 22 hr |
| Feb 21, 2:38 PM EST | Winter Weather Advisory | LWX | 42 hr |
| Feb 22, 7:01 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 25, 9:20 PM EST | Winter Weather Advisory | LWX | 12 hr |
| Mar 3, 3:44 PM EST | Flood Watch | LWX | 36 hr |
| Mar 7, 3:42 PM EST | Wind Advisory | LWX | 35 hr |
| Mar 8, 3:06 AM EST | High Wind Warning | LWX | 19 hr |
| Mar 19, 8:46 PM EDT | Wind Advisory | LWX | 19 hr |
| Apr 20, 3:12 AM EDT | Flood Watch | LWX | 27 hr |
| Apr 26, 6:11 AM EDT | Dense Fog Advisory | LWX | 4 hr |
| Apr 29, 2:23 PM EDT | Frost Advisory | LWX | 18 hr |
| May 8, 3:19 PM EDT | Flood Watch | LWX | 17 hr |
| May 10, 3:49 PM EDT | Flood Watch | LWX | 46 hr |
| May 12, 12:14 AM EDT | Areal Flood Warning | LWX | 12 hr |
| May 31, 8:54 AM EDT | Mesoscale Discussion | SPC | 96 min |
| May 31, 10:14 AM EDT | Severe Thunderstorm Warning | LWX | 44 min |
| May 31, 10:20 AM EDT | Tornado Watch | SPC | 7 hr |
| May 31, 10:25 AM EDT | Tornado Watch | SPC | 7 hr |
| May 31, 12:56 PM EDT | Severe Thunderstorm Warning | LWX | 40 min |
| Jun 4, 1:14 AM EDT | Flash Flood Watch | LWX | 8 hr |
| Jun 4, 11:51 AM EDT | Mesoscale Discussion | SPC | 84 min |
| Jun 4, 12:49 PM EDT | Tornado Watch | SPC | 7 hr |
| Jun 4, 1:59 PM EDT | Severe Thunderstorm Warning | LWX | 61 min |
| Jun 4, 2:15 PM EDT | Tornado Warning | LWX | 29 min |
| Jun 4, 2:23 PM EDT | Severe Thunderstorm Warning | LWX | 58 min |
| Jun 4, 2:27 PM EDT | Tornado Warning | LWX | 29 min |
| Jun 4, 4:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 4, 7:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 6, 4:17 AM EDT | Excessive Heat Watch | LWX | 48 hr |
| Jun 6, 3:19 PM EDT | Heat Advisory | LWX | 29 hr |
| Jun 7, 8:08 PM EDT | Heat Advisory | LWX | 71 hr |
| Jun 10, 2:27 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Jun 10, 2:54 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 10, 3:44 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Jun 14, 12:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 14, 1:51 PM EDT | Severe Thunderstorm Warning | LWX | 54 min |
| Jun 16, 12:54 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 16, 1:21 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jun 16, 3:24 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| Jun 16, 6:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 22, 12:16 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 22, 1:15 PM EDT | Severe Thunderstorm Watch | SPC | 11 hr |
| Jun 22, 4:28 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jun 23, 5:00 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 23, 7:52 PM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Jun 23, 8:20 PM EDT | Severe Thunderstorm Warning | LWX | 55 min |
| Jun 23, 8:30 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jun 27, 11:37 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 6:31 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 28, 7:12 PM EDT | Severe Thunderstorm Warning | LWX | 63 min |
| Jun 29, 2:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 29, 4:37 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 29, 9:30 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 10:30 PM EDT | Severe Thunderstorm Warning | LWX | 63 min |
| Jun 29, 10:58 PM EDT | Severe Thunderstorm Warning | LWX | 77 min |
| Jun 30, 7:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jul 4, 3:48 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 13, 1:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 20, 6:57 PM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| Jul 20, 7:19 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| Jul 23, 12:52 AM EDT | Severe Thunderstorm Warning | LWX | 53 min |
| Jul 23, 3:25 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 26, 7:12 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Jul 27, 11:03 AM EDT | Mesoscale Discussion | SPC | 57 min |
| Jul 27, 12:10 PM EDT | Severe Thunderstorm Warning | LWX | 32 min |
| Aug 2, 1:18 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Aug 2, 1:56 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 2, 7:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Aug 10, 1:36 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 10, 2:56 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| Aug 10, 3:13 PM EDT | Severe Thunderstorm Warning | LWX | 34 min |
| Aug 10, 4:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 14, 4:27 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 4, 5:26 PM EDT | Flash Flood Watch | LWX | 47 hr |
| Sep 6, 4:22 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 24, 11:47 AM EDT | High Wind Watch | LWX | 17 hr |
| Sep 30, 7:13 AM EDT | Dense Fog Advisory | LWX | 3 hr |
| Oct 17, 3:33 AM EDT | Freeze Watch | LWX | 36 hr |
| Oct 18, 3:25 AM EDT | Freeze Watch | LWX | 24 hr |
| Oct 19, 3:39 AM EDT | Freeze Warning | LWX | 29 hr |
| Oct 20, 1:52 PM EDT | Fire Weather Watch | LWX | 20 hr |
| Oct 28, 4:24 AM EDT | Wind Advisory | LWX | 30 hr |
| Nov 13, 7:06 PM EST | Dense Fog Advisory | LWX | 15 hr |
| Nov 29, 3:47 PM EST | Winter Weather Advisory | LWX | 27 hr |
| Dec 7, 10:05 AM EST | Wind Advisory | LWX | 7 hr |
| Dec 10, 3:46 PM EST | Winter Weather Advisory | LWX | 42 hr |
| Dec 10, 9:56 PM EST | Flood Watch | LWX | 24 hr |
| Dec 15, 3:59 PM EST | Winter Storm Watch | LWX | 13 hr |
| Dec 16, 4:32 AM EST | Winter Weather Advisory | LWX | 30 hr |
| Dec 19, 4:29 AM EST | Dense Fog Advisory | LWX | 5 hr |
| Dec 20, 12:00 AM EST | Dense Fog Advisory | LWX | 5 hr |
| Dec 20, 3:17 PM EST | Winter Weather Advisory | LWX | 18 hr |
| Dec 20, 11:55 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 21, 3:17 PM EST | Wind Chill Advisory | LWX | 21 hr |
| Dec 21, 3:21 PM EST | Wind Advisory | LWX | 21 hr |
| Dec 23, 3:40 PM EST | Winter Weather Advisory | LWX | 18 hr |
| Dec 30, 2:58 PM EST | Wind Advisory | LWX | 31 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 | 19 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 10 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 30 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Watch | 2 |
| Flood Watch | 5 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 3 |
| Snow Advisory | 1 |
| Winter Weather Advisory | 10 |
| Heat | |
| Excessive Heat Watch | 1 |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 2 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 1 |
| Wind Advisory | 8 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20072009
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.