Alert archive / Virginia / Appomattox County
Weather alerts in Appomattox County, Virginia, 2009
122 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Appomattox County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 122
- Warnings
- 21
- Watches
- 19
- Advisories
- 21
- Busiest month
- July26 alerts
- Busiest day
- July 17, 20096 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 1 tornado warnings covering Appomattox County in 2009 had a tornado report inside them.
Appomattox County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 0 | ||
| Severe thunderstorm warnings | 13 | 9 | 31% | 3 | 100% | 35 min |
| Flash flood warnings | 2 | 2 | 0% | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Blacksburg, VA: tornado warnings | 19 | 1 | 95% | 9 | 11% | 4 min |
| NWS Blacksburg, VA: severe thunderstorm warnings | 264 | 144 | 45% | 348 | 82% | 26 min |
| NWS Blacksburg, VA: flash flood warnings | 108 | 53 | 51% | 135 | 81% | 100 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, 4:19 AM EST | Wind Chill Advisory | RNK | 33 hr |
| Jan 26, 3:20 PM EST | Winter Storm Warning | RNK | 45 hr |
| Jan 26, 3:20 PM EST | Winter Weather Advisory | RNK | 45 hr |
| Feb 3, 4:01 AM EST | Winter Weather Advisory | RNK | 32 hr |
| Feb 11, 4:40 AM EST | Wind Advisory | RNK | 43 hr |
| Feb 11, 3:04 PM EST | Fire Weather Watch | RNK | 15 hr |
| Feb 11, 5:32 PM EST | Mesoscale Discussion | SPC | 88 min |
| Feb 11, 8:00 PM EST | Mesoscale Discussion | SPC | 60 min |
| Feb 12, 5:43 AM EST | Red Flag Warning | RNK | 15 hr |
| Feb 28, 5:24 AM EST | Winter Storm Watch | RNK | 23 hr |
| Mar 1, 4:39 AM EST | Winter Storm Warning | RNK | 28 hr |
| Mar 1, 1:16 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Mar 1, 5:01 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Mar 27, 4:12 AM EDT | Dense Fog Advisory | RNK | 6 hr |
| Apr 2, 4:17 AM EDT | Dense Fog Advisory | RNK | 5 hr |
| Apr 3, 3:57 AM EDT | Wind Advisory | RNK | 32 hr |
| Apr 3, 8:24 AM EDT | Special Weather Statement | RNK | 66 min |
| Apr 3, 9:34 AM EDT | Special Weather Statement | RNK | 71 min |
| Apr 16, 2:42 PM EDT | Frost Advisory | RNK | 17 hr |
| Apr 20, 2:09 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 20, 2:50 PM EDT | Tornado Watch | SPC | 7 hr |
| Apr 20, 4:26 PM EDT | Special Weather Statement | RNK | 64 min |
| Apr 20, 4:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 20, 5:03 PM EDT | Severe Thunderstorm Warning | RNK | 56 min |
| Apr 21, 2:12 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 2, 2:39 PM EDT | Special Weather Statement | RNK | 66 min |
| May 3, 11:52 PM EDT | Special Weather Statement | RNK | 53 min |
| May 4, 12:44 AM EDT | Special Weather Statement | RNK | 61 min |
| May 4, 12:29 PM EDT | Tornado Watch | SPC | 5 hr |
| May 6, 2:16 PM EDT | Tornado Watch | SPC | 6 hr |
| May 6, 3:45 PM EDT | Special Weather Statement | RNK | 60 min |
| May 6, 8:26 PM EDT | Tornado Watch | SPC | 8 hr |
| May 6, 10:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| May 6, 11:53 PM EDT | Severe Thunderstorm Warning | RNK | 37 min |
| May 7, 12:10 AM EDT | Mesoscale Discussion | SPC | 95 min |
| May 8, 10:01 PM EDT | Tornado Watch | SPC | 4 hr |
| May 9, 12:23 AM EDT | Severe Thunderstorm Warning | RNK | 63 min |
| May 9, 12:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| May 9, 1:17 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 9, 4:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| May 14, 11:12 PM EDT | Flash Flood Warning | RNK | 6 hr |
| May 26, 12:07 PM EDT | Flash Flood Watch | RNK | 20 hr |
| May 28, 3:49 PM EDT | Mesoscale Discussion | SPC | 56 min |
| May 28, 7:43 PM EDT | Special Weather Statement | RNK | 47 min |
| May 29, 2:41 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 29, 6:01 PM EDT | Mesoscale Discussion | SPC | 59 min |
| May 31, 2:48 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 3, 12:41 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 3, 1:06 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 3, 1:51 PM EDT | Flash Flood Watch | RNK | 15 hr |
| Jun 3, 4:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jun 3, 7:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 4, 4:48 AM EDT | Flood Watch | RNK | 31 hr |
| Jun 4, 2:30 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jun 9, 2:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 9, 6:24 PM EDT | Severe Thunderstorm Warning | RNK | 96 min |
| Jun 9, 6:48 PM EDT | Severe Thunderstorm Warning | RNK | 87 min |
| Jun 9, 7:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jun 10, 1:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 11, 11:51 AM EDT | Mesoscale Discussion | SPC | 84 min |
| Jun 11, 1:59 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 11, 8:24 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jun 11, 8:51 PM EDT | Special Weather Statement | RNK | 54 min |
| Jun 11, 9:39 PM EDT | Special Weather Statement | RNK | 66 min |
| Jun 13, 8:44 PM EDT | Special Weather Statement | RNK | 61 min |
| Jun 13, 9:09 PM EDT | Special Weather Statement | RNK | 51 min |
| Jun 13, 9:18 PM EDT | Severe Thunderstorm Warning | RNK | 42 min |
| Jun 19, 9:19 PM EDT | Mesoscale Discussion | SPC | 26 min |
| Jun 20, 1:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 1, 12:48 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jul 1, 7:20 PM EDT | Special Weather Statement | RNK | 55 min |
| Jul 12, 12:21 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 12, 4:05 PM EDT | Severe Thunderstorm Warning | RNK | 23 min |
| Jul 17, 9:52 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 17, 10:29 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 17, 11:21 AM EDT | Tornado Warning | RNK | 39 min |
| Jul 17, 11:30 AM EDT | Areal Flood Advisory | RNK | 3 hr |
| Jul 17, 11:58 AM EDT | Severe Thunderstorm Warning | RNK | 62 min |
| Jul 17, 12:59 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jul 17, 8:49 PM EDT | Special Weather Statement | RNK | 41 min |
| Jul 20, 9:27 AM EDT | Flash Flood Watch | RNK | 12 hr |
| Jul 20, 10:58 AM EDT | Special Weather Statement | RNK | 62 min |
| Jul 20, 11:27 AM EDT | Severe Thunderstorm Warning | RNK | 63 min |
| Jul 20, 12:23 PM EDT | Severe Thunderstorm Warning | RNK | 52 min |
| Jul 20, 1:15 PM EDT | Areal Flood Advisory | RNK | 6 hr |
| Jul 23, 7:51 PM EDT | Special Weather Statement | RNK | 54 min |
| Jul 26, 1:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 26, 2:07 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 26, 2:15 PM EDT | Severe Thunderstorm Warning | RNK | 75 min |
| Jul 27, 12:20 AM EDT | Special Weather Statement | RNK | 55 min |
| Jul 28, 5:45 PM EDT | Special Weather Statement | RNK | 60 min |
| Jul 28, 8:55 PM EDT | Special Weather Statement | RNK | 35 min |
| Jul 29, 1:04 AM EDT | Special Weather Statement | RNK | 56 min |
| Jul 30, 6:49 PM EDT | Special Weather Statement | RNK | 56 min |
| Jul 30, 7:45 PM EDT | Special Weather Statement | RNK | 60 min |
| Aug 4, 4:48 PM EDT | Severe Thunderstorm Warning | RNK | 57 min |
| Aug 5, 8:12 PM EDT | Severe Thunderstorm Warning | RNK | 45 min |
| Aug 5, 9:00 PM EDT | Flash Flood Warning | RNK | 5 hr |
| Aug 21, 12:36 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 21, 9:13 PM EDT | Special Weather Statement | RNK | 62 min |
| Aug 22, 12:04 PM EDT | Special Weather Statement | RNK | 56 min |
| Aug 23, 11:26 PM EDT | Special Weather Statement | RNK | 79 min |
| Aug 27, 5:05 PM EDT | Special Weather Statement | RNK | 55 min |
| Aug 29, 6:23 PM EDT | Special Weather Statement | RNK | 67 min |
| Sep 28, 2:28 PM EDT | Special Weather Statement | RNK | 62 min |
| Oct 18, 10:25 AM EDT | Frost Advisory | RNK | 24 hr |
| Oct 19, 3:27 AM EDT | Frost Advisory | RNK | 31 hr |
| Nov 3, 1:44 PM EST | Frost Advisory | RNK | 17 hr |
| Nov 10, 2:46 PM EST | Flood Watch | RNK | 45 hr |
| Nov 11, 4:10 AM EST | Wind Advisory | RNK | 50 hr |
| Nov 11, 10:57 AM EST | Areal Flood Warning | RNK | 46 hr |
| Nov 26, 1:34 AM EST | Dense Fog Advisory | RNK | 7 hr |
| Dec 4, 3:57 PM EST | Winter Weather Advisory | RNK | 27 hr |
| Dec 8, 5:11 AM EST | Wind Advisory | RNK | 64 hr |
| Dec 12, 4:41 AM EST | Winter Weather Advisory | RNK | 31 hr |
| Dec 13, 8:05 PM EST | Dense Fog Advisory | RNK | 13 hr |
| Dec 17, 3:20 PM EST | Winter Storm Warning | RNK | 60 hr |
| Dec 18, 7:22 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 19, 12:34 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 24, 4:04 AM EST | Freezing Rain Advisory | RNK | 35 hr |
| Dec 30, 3:22 PM EST | Winter Weather Advisory | RNK | 21 hr |
| Dec 30, 10:57 PM 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.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 13 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 7 |
| Tornado Watch | 5 |
| Mesoscale Discussion | 33 |
| Special Weather Statement | 28 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 3 |
| Flood Watch | 2 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 1 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 5 |
| Cold | |
| Frost Advisory | 4 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.