Alert archive / Virginia / Roanoke County
Weather alerts in Roanoke County, Virginia, 2023
95 weather alerts in 2023, 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 2023. Tap one for its archive.
- Alerts
- 95
- Warnings
- 28
- Watches
- 12
- Advisories
- 30
- Busiest month
- July32 alerts
- Busiest day
- May 29, 20236 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, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 14 | 14 | 0% | 12 | 58% | 23 min |
| Flash flood warnings | 5 | 3 | 40% | 1 | 100% | 11 min |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Blacksburg, VA: tornado warnings | 8 | 1 | 88% | 2 | 100% | 6 min |
| NWS Blacksburg, VA: severe thunderstorm warnings | 225 | 197 | 12% | 776 | 75% | 22 min |
| NWS Blacksburg, VA: flash flood warnings | 30 | 18 | 40% | 60 | 70% | 88 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 |
|---|---|---|---|
| Dec 31, 8:35 PM EST | Dense Fog Advisory | RNK | 10 hr |
| Jan 7, 3:27 PM EST | Winter Weather Advisory | RNK | 39 hr |
| Jan 19, 4:19 AM EST | Wind Advisory | RNK | 36 hr |
| Jan 21, 4:05 AM EST | Winter Weather Advisory | RNK | 38 hr |
| Feb 11, 4:36 AM EST | Winter Weather Advisory | RNK | 41 hr |
| Feb 13, 1:56 AM EST | Areal Flood Advisory | RNK | 4 hr |
| Feb 17, 4:08 AM EST | Wind Advisory | RNK | 23 hr |
| Feb 17, 5:38 AM EST | Special Weather Statement | RNK | 37 min |
| Feb 26, 4:59 AM EST | Dense Fog Advisory | RNK | 5 hr |
| Feb 27, 3:09 AM EST | Wind Advisory | RNK | 30 hr |
| Mar 2, 4:10 AM EST | Wind Advisory | RNK | 54 hr |
| Mar 3, 7:30 PM EST | Special Weather Statement | RNK | 45 min |
| Mar 3, 8:13 PM EST | Special Weather Statement | RNK | 62 min |
| Mar 11, 4:09 AM EST | Winter Weather Advisory | RNK | 45 hr |
| Mar 13, 2:37 PM EDT | Wind Advisory | RNK | 34 hr |
| Mar 25, 6:44 AM EDT | Special Weather Statement | RNK | 46 min |
| Mar 30, 2:47 PM EDT | High Wind Watch | RNK | 21 hr |
| Mar 31, 11:57 AM EDT | High Wind Warning | RNK | 40 hr |
| Apr 8, 2:32 PM EDT | Frost Advisory | RNK | 19 hr |
| Apr 9, 2:04 PM EDT | Freeze Warning | RNK | 19 hr |
| Apr 10, 10:00 AM EDT | Frost Advisory | RNK | 23 hr |
| Apr 17, 3:28 PM EDT | Fire Weather Watch | RNK | 12 hr |
| Apr 18, 3:31 AM EDT | Red Flag Warning | RNK | 16 hr |
| Apr 22, 6:25 AM EDT | Special Weather Statement | RNK | 65 min |
| Apr 22, 8:07 AM EDT | Mesoscale Discussion | SPC | 113 min |
| Apr 22, 9:07 AM EDT | Severe Thunderstorm Warning | RNK | 53 min |
| Apr 24, 9:58 AM EDT | Freeze Warning | RNK | 22 hr |
| May 16, 2:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| May 16, 4:03 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 29, 12:16 AM EDT | Areal Flood Advisory | RNK | 4 hr |
| May 29, 2:30 AM EDT | Areal Flood Advisory | RNK | 4 hr |
| May 29, 8:02 AM EDT | Areal Flood Advisory | RNK | 91 min |
| May 29, 9:33 AM EDT | Flash Flood Warning | RNK | 4 hr |
| May 29, 12:49 PM EDT | Areal Flood Warning | RNK | 6 hr |
| May 29, 1:25 PM EDT | Areal Flood Warning | RNK | 3 hr |
| Jun 20, 3:38 AM EDT | Areal Flood Advisory | RNK | 2 hr |
| Jun 20, 5:38 AM EDT | Flash Flood Warning | RNK | 6 hr |
| Jun 26, 12:36 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 3:05 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 3, 1:36 AM EDT | Special Weather Statement | RNK | 54 min |
| Jul 3, 2:42 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 13, 2:36 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 13, 5:12 PM EDT | Severe Thunderstorm Warning | RNK | 63 min |
| Jul 13, 9:52 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Jul 14, 2:00 AM EDT | Areal Flood Advisory | RNK | 2 hr |
| Jul 14, 4:29 PM EDT | Special Weather Statement | RNK | 31 min |
| Jul 14, 4:42 PM EDT | Severe Thunderstorm Warning | RNK | 48 min |
| Jul 15, 2:24 PM EDT | Special Weather Statement | RNK | 36 min |
| Jul 15, 2:31 PM EDT | Severe Thunderstorm Warning | RNK | 44 min |
| Jul 15, 2:36 PM EDT | Areal Flood Advisory | RNK | 6 hr |
| Jul 15, 3:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 6:44 PM EDT | Special Weather Statement | RNK | 16 min |
| Jul 15, 10:12 PM EDT | Areal Flood Advisory | RNK | 74 min |
| Jul 17, 7:35 PM EDT | Severe Thunderstorm Warning | RNK | 70 min |
| Jul 19, 2:28 AM EDT | Special Weather Statement | RNK | 47 min |
| Jul 19, 2:55 AM EDT | Areal Flood Advisory | RNK | 3 hr |
| Jul 20, 6:28 PM EDT | Flash Flood Warning | RNK | 4 hr |
| Jul 23, 2:43 PM EDT | Special Weather Statement | RNK | 32 min |
| Jul 23, 5:22 PM EDT | Severe Thunderstorm Warning | RNK | 53 min |
| Jul 23, 5:29 PM EDT | Flash Flood Warning | RNK | 3 hr |
| Jul 23, 5:50 PM EDT | Severe Thunderstorm Warning | RNK | 55 min |
| Jul 23, 6:14 PM EDT | Severe Thunderstorm Warning | RNK | 61 min |
| Jul 23, 8:50 PM EDT | Areal Flood Advisory | RNK | 70 min |
| Jul 27, 2:45 PM EDT | Heat Advisory | RNK | 28 hr |
| Jul 28, 2:21 PM EDT | Heat Advisory | RNK | 30 hr |
| Jul 28, 4:48 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 28, 4:51 PM EDT | Severe Thunderstorm Warning | RNK | 69 min |
| Jul 28, 5:33 PM EDT | Severe Thunderstorm Warning | RNK | 72 min |
| Jul 28, 6:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 29, 2:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 29, 3:45 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 7, 8:18 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Aug 7, 12:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 1:51 PM EDT | Tornado Watch | SPC | 6 hr |
| Aug 7, 4:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Aug 14, 10:56 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 24, 1:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 25, 8:11 AM EDT | Special Weather Statement | RNK | 34 min |
| Sep 7, 3:32 PM EDT | Severe Thunderstorm Warning | RNK | 58 min |
| Sep 7, 4:04 PM EDT | Special Weather Statement | RNK | 26 min |
| Sep 7, 4:22 PM EDT | Severe Thunderstorm Warning | RNK | 53 min |
| Sep 9, 3:19 AM EDT | Flood Watch | RNK | 23 hr |
| Sep 9, 1:16 PM EDT | Severe Thunderstorm Warning | RNK | 44 min |
| Sep 9, 2:48 PM EDT | Flash Flood Warning | RNK | 3 hr |
| Sep 12, 3:58 PM EDT | Severe Thunderstorm Warning | RNK | 62 min |
| Oct 30, 2:32 PM EDT | Freeze Watch | RNK | 14 hr |
| Oct 31, 4:02 AM EDT | Freeze Warning | RNK | 30 hr |
| Nov 1, 4:51 AM EDT | Freeze Warning | RNK | 28 hr |
| Nov 17, 11:24 AM EST | Fire Weather Watch | RNK | 20 hr |
| Nov 18, 2:05 AM EST | Dense Fog Advisory | RNK | 5 hr |
| Nov 27, 2:21 AM EST | Wind Advisory | RNK | 35 hr |
| Dec 17, 5:01 AM EST | Wind Advisory | RNK | 47 hr |
| Dec 17, 2:15 PM EST | High Wind Warning | RNK | 29 hr |
| Dec 17, 2:15 PM EST | Wind Advisory | RNK | 38 hr |
| Dec 18, 8:37 PM EST | Special Weather Statement | RNK | 23 min |
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 | 14 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 11 |
| Special Weather Statement | 14 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 5 |
| Flood Watch | 1 |
| Areal Flood Advisory | 11 |
| Winter | |
| Winter Weather Advisory | 4 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 1 |
| Wind Advisory | 8 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20222024
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.