Alert archive / Virginia / Roanoke County
Weather alerts in Roanoke County, Virginia, 2008
110 weather alerts in 2008, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Roanoke County and its neighbors
Each county as a circle sized by its count in 2008. Tap one for its archive.
- Alerts
- 110
- Warnings
- 44
- Watches
- 16
- Advisories
- 33
- Busiest month
- June26 alerts
- Busiest day
- June 22, 20087 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Roanoke County, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 31 | 26 | 16% | 11 | 100% | 19 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Blacksburg, VA: tornado warnings | 23 | 2 | 91% | 6 | 33% | 22 min |
| NWS Blacksburg, VA: severe thunderstorm warnings | 449 | 253 | 44% | 528 | 78% | 23 min |
| NWS Blacksburg, VA: flash flood warnings | 61 | 23 | 62% | 93 | 87% | 235 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 2, 4:15 PM EST | Wind Chill Advisory | RNK | 18 hr |
| Jan 16, 3:54 AM EST | Winter Storm Warning | RNK | 34 hr |
| Jan 16, 3:54 AM EST | Winter Weather Advisory | RNK | 41 hr |
| Jan 17, 12:58 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 17, 7:51 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 19, 12:44 PM EST | Wind Chill Advisory | RNK | 23 hr |
| Jan 21, 3:38 PM EST | Winter Weather Advisory | RNK | 24 hr |
| Jan 29, 5:00 AM EST | Wind Advisory | RNK | 30 hr |
| Jan 30, 2:56 PM EST | Winter Storm Watch | RNK | 14 hr |
| Jan 31, 5:03 AM EST | Ice Storm Warning | RNK | 31 hr |
| Jan 31, 7:34 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 1, 7:36 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 5, 2:13 AM EST | Dense Fog Advisory | RNK | 7 hr |
| Feb 6, 4:49 AM EST | Mesoscale Discussion | SPC | 86 min |
| Feb 9, 3:18 AM EST | Fire Weather Watch | RNK | 10 hr |
| Feb 9, 3:29 AM EST | High Wind Warning | RNK | 46 hr |
| Feb 9, 3:29 AM EST | Wind Advisory | RNK | 42 hr |
| Feb 9, 1:33 PM EST | Red Flag Warning | RNK | 31 hr |
| Feb 10, 9:10 PM EST | Wind Advisory | RNK | 4 hr |
| Feb 12, 4:58 PM EST | Freezing Rain Advisory | RNK | 13 hr |
| Feb 18, 9:31 PM EST | Red Flag Warning | RNK | 20 hr |
| Feb 19, 3:13 AM EST | Wind Advisory | RNK | 15 hr |
| Feb 21, 4:48 AM EST | Winter Weather Advisory | RNK | 31 hr |
| Feb 26, 4:24 AM EST | Wind Advisory | RNK | 36 hr |
| Mar 4, 4:31 PM EST | Tornado Watch | SPC | 8 hr |
| Mar 4, 7:51 PM EST | Severe Thunderstorm Warning | RNK | 54 min |
| Mar 4, 8:18 PM EST | Areal Flood Advisory | RNK | 3 hr |
| Mar 4, 8:47 PM EST | Severe Thunderstorm Warning | RNK | 50 min |
| Mar 7, 2:03 PM EST | Wind Advisory | RNK | 34 hr |
| Mar 7, 9:35 PM EST | Dense Fog Advisory | RNK | 11 hr |
| Mar 19, 3:44 PM EDT | Wind Advisory | RNK | 24 hr |
| Apr 14, 3:04 PM EDT | Frost Advisory | RNK | 18 hr |
| Apr 14, 3:04 PM EDT | Freeze Watch | RNK | 13 hr |
| Apr 15, 4:31 AM EDT | Freeze Warning | RNK | 28 hr |
| Apr 16, 4:50 PM EDT | Frost Advisory | RNK | 16 hr |
| Apr 19, 9:00 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Apr 20, 5:22 AM EDT | Dense Fog Advisory | RNK | 4 hr |
| Apr 25, 5:29 PM EDT | Areal Flood Advisory | RNK | 35 min |
| Apr 29, 4:12 AM EDT | Frost Advisory | RNK | 29 hr |
| May 8, 2:22 PM EDT | Mesoscale Discussion | SPC | 83 min |
| May 8, 6:12 PM EDT | Mesoscale Discussion | SPC | 63 min |
| May 8, 6:48 PM EDT | Tornado Watch | SPC | 9 hr |
| May 8, 9:02 PM EDT | Severe Thunderstorm Warning | RNK | 58 min |
| May 10, 3:54 PM EDT | High Wind Watch | RNK | 25 hr |
| May 11, 11:08 AM EDT | High Wind Warning | RNK | 32 hr |
| May 11, 2:03 PM EDT | Severe Thunderstorm Warning | RNK | 17 min |
| May 31, 12:05 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jun 1, 6:58 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jun 1, 7:06 PM EDT | Severe Thunderstorm Warning | RNK | 54 min |
| Jun 3, 6:59 PM EDT | Severe Thunderstorm Warning | RNK | 46 min |
| Jun 3, 7:22 PM EDT | Severe Thunderstorm Warning | RNK | 53 min |
| Jun 10, 3:06 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 10, 6:30 PM EDT | Severe Thunderstorm Warning | RNK | 60 min |
| Jun 14, 2:38 PM EDT | Severe Thunderstorm Warning | RNK | 39 min |
| Jun 14, 3:00 PM EDT | Severe Thunderstorm Warning | RNK | 60 min |
| Jun 22, 12:16 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 22, 12:20 PM EDT | Severe Thunderstorm Warning | RNK | 55 min |
| Jun 22, 1:09 PM EDT | Severe Thunderstorm Warning | RNK | 66 min |
| Jun 22, 1:15 PM EDT | Severe Thunderstorm Watch | SPC | 11 hr |
| Jun 22, 1:44 PM EDT | Severe Thunderstorm Warning | RNK | 61 min |
| Jun 22, 1:49 PM EDT | Severe Thunderstorm Warning | RNK | 56 min |
| Jun 22, 4:28 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jun 22, 8:26 PM EDT | Severe Thunderstorm Warning | RNK | 64 min |
| Jun 22, 9:14 PM EDT | Severe Thunderstorm Warning | RNK | 61 min |
| Jun 26, 4:12 PM EDT | Severe Thunderstorm Warning | RNK | 48 min |
| Jun 26, 4:34 PM EDT | Severe Thunderstorm Warning | RNK | 56 min |
| Jun 26, 5:30 PM EDT | Severe Thunderstorm Warning | RNK | 60 min |
| Jun 27, 12:14 PM EDT | Severe Thunderstorm Warning | RNK | 59 min |
| Jun 27, 12:40 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 27, 2:52 PM EDT | Severe Thunderstorm Warning | RNK | 53 min |
| Jun 27, 3:43 PM EDT | Severe Thunderstorm Warning | RNK | 77 min |
| Jun 29, 4:37 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 30, 11:01 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Jul 6, 1:44 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Jul 6, 6:26 PM EDT | Severe Thunderstorm Warning | RNK | 64 min |
| Jul 7, 1:20 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 7, 1:32 PM EDT | Severe Thunderstorm Warning | RNK | 58 min |
| Jul 7, 1:36 PM EDT | Flash Flood Warning | RNK | 2 hr |
| Jul 7, 3:15 PM EDT | Severe Thunderstorm Warning | RNK | 60 min |
| Jul 8, 6:24 PM EDT | Severe Thunderstorm Warning | RNK | 66 min |
| Jul 9, 4:05 PM EDT | Severe Thunderstorm Warning | RNK | 55 min |
| Jul 22, 9:01 PM EDT | Severe Thunderstorm Warning | RNK | 74 min |
| Jul 23, 1:28 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 23, 3:25 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 23, 3:55 PM EDT | Severe Thunderstorm Warning | RNK | 65 min |
| Jul 23, 4:03 PM EDT | Severe Thunderstorm Warning | RNK | 47 min |
| Jul 23, 4:48 PM EDT | Severe Thunderstorm Warning | RNK | 57 min |
| Jul 23, 4:56 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Aug 2, 4:05 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 2, 7:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Aug 26, 3:25 PM EDT | Flash Flood Watch | RNK | 37 hr |
| Sep 25, 3:38 AM EDT | Wind Advisory | RNK | 20 hr |
| Oct 18, 3:59 AM EDT | Frost Advisory | RNK | 29 hr |
| Oct 18, 3:59 AM EDT | Freeze Watch | RNK | 24 hr |
| Oct 19, 3:40 AM EDT | Freeze Warning | RNK | 29 hr |
| Oct 22, 3:56 AM EDT | Freeze Warning | RNK | 29 hr |
| Oct 27, 3:46 PM EDT | Freeze Watch | RNK | 12 hr |
| Oct 28, 3:56 AM EDT | Freeze Warning | RNK | 29 hr |
| Oct 28, 3:56 AM EDT | Freeze Warning | RNK | 53 hr |
| Oct 28, 3:56 AM EDT | Wind Advisory | RNK | 32 hr |
| Nov 13, 9:15 PM EST | Dense Fog Advisory | RNK | 12 hr |
| Nov 29, 8:05 PM EST | Winter Weather Advisory | RNK | 16 hr |
| Dec 11, 9:54 AM EST | Flood Watch | RNK | 11 hr |
| Dec 18, 3:55 PM EST | Dense Fog Advisory | RNK | 20 hr |
| Dec 19, 4:37 AM EST | Wind Advisory | RNK | 17 hr |
| Dec 21, 3:12 PM EST | Wind Advisory | RNK | 18 hr |
| Dec 23, 4:45 PM EST | Winter Weather Advisory | RNK | 11 hr |
| Dec 29, 8:58 PM EST | Wind Advisory | RNK | 9 hr |
| Dec 30, 2:21 PM EST | High Wind Warning | RNK | 31 hr |
| Dec 30, 2:21 PM EST | Wind Advisory | RNK | 31 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 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.