Alert archive / Virginia / Roanoke County
Weather alerts in Roanoke County, Virginia, 2019
156 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 156
- Warnings
- 40
- Watches
- 21
- Advisories
- 42
- Busiest month
- April24 alerts
- Busiest day
- October 31, 20198 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, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 27 | 22 | 19% | 23 | 65% | 33 min |
| Flash flood warnings | 1 | 1 | 0% | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Blacksburg, VA: tornado warnings | 45 | 1 | 98% | 4 | 50% | 32 min |
| NWS Blacksburg, VA: severe thunderstorm warnings | 299 | 219 | 27% | 791 | 68% | 25 min |
| NWS Blacksburg, VA: flash flood warnings | 35 | 14 | 60% | 52 | 48% | 70 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 4, 3:17 PM EST | Wind Advisory | RNK | 24 hr |
| Jan 5, 6:54 AM EST | High Wind Warning | RNK | 6 hr |
| Jan 8, 3:57 AM EST | High Wind Watch | RNK | 10 hr |
| Jan 8, 2:07 PM EST | High Wind Warning | RNK | 41 hr |
| Jan 11, 4:06 AM EST | Winter Storm Watch | RNK | 12 hr |
| Jan 11, 3:44 PM EST | Winter Storm Warning | RNK | 51 hr |
| Jan 13, 7:16 PM EST | Winter Weather Advisory | RNK | 15 hr |
| Jan 17, 4:49 AM EST | Winter Weather Advisory | RNK | 24 hr |
| Jan 19, 3:39 PM EST | High Wind Warning | RNK | 37 hr |
| Jan 20, 12:16 PM EST | Wind Chill Advisory | RNK | 24 hr |
| Jan 20, 9:09 PM EST | Wind Advisory | RNK | 7 hr |
| Jan 23, 5:22 AM EST | Flood Watch | RNK | 29 hr |
| Jan 24, 4:26 AM EST | Wind Advisory | RNK | 13 hr |
| Jan 28, 4:21 AM EST | Winter Weather Advisory | RNK | 35 hr |
| Jan 29, 3:20 PM EST | Wind Chill Advisory | RNK | 45 hr |
| Jan 29, 10:25 PM EST | Wind Advisory | RNK | 21 hr |
| Feb 8, 3:22 AM EST | Wind Advisory | RNK | 17 hr |
| Feb 10, 4:43 AM EST | Winter Weather Advisory | RNK | 27 hr |
| Feb 11, 1:55 PM EST | Winter Weather Advisory | RNK | 20 hr |
| Feb 12, 3:32 AM EST | Wind Advisory | RNK | 37 hr |
| Feb 12, 5:09 PM EST | Special Weather Statement | RNK | 81 min |
| Feb 12, 6:44 PM EST | Special Weather Statement | RNK | 2 hr |
| Feb 16, 4:10 PM EST | Winter Weather Advisory | RNK | 27 hr |
| Feb 18, 3:28 AM EST | Winter Storm Watch | RNK | 12 hr |
| Feb 18, 3:33 PM EST | Winter Storm Warning | RNK | 56 hr |
| Feb 20, 12:26 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 20, 7:06 PM EST | Winter Weather Advisory | RNK | 5 hr |
| Feb 21, 2:44 PM EST | Flood Watch | RNK | 67 hr |
| Feb 23, 1:56 AM EST | High Wind Watch | RNK | 14 hr |
| Feb 23, 8:32 AM EST | River Flood Warning | RNK | 22 hr |
| Feb 23, 9:32 AM EST | Areal Flood Advisory | RNK | 9 hr |
| Feb 23, 4:08 PM EST | High Wind Warning | RNK | 44 hr |
| Feb 23, 7:38 PM EST | Areal Flood Advisory | RNK | 4 hr |
| Feb 24, 12:05 AM EST | Areal Flood Warning | RNK | 9 hr |
| Mar 1, 8:14 PM EST | Special Weather Statement | RNK | 61 min |
| Mar 5, 3:24 AM EST | Wind Chill Advisory | RNK | 31 hr |
| Mar 7, 3:05 PM EST | Winter Weather Advisory | RNK | 24 hr |
| Mar 15, 2:49 PM EDT | Wind Advisory | RNK | 20 hr |
| Mar 19, 10:00 AM EDT | Special Weather Statement | RNK | 15 min |
| Mar 22, 3:30 AM EDT | Wind Advisory | RNK | 24 hr |
| Mar 22, 4:54 PM EDT | Special Weather Statement | RNK | 66 min |
| Apr 8, 1:49 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Apr 8, 2:32 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 8, 3:21 PM EDT | Severe Thunderstorm Warning | RNK | 39 min |
| Apr 8, 3:42 PM EDT | Severe Thunderstorm Warning | RNK | 3 min |
| Apr 8, 3:56 PM EDT | Areal Flood Advisory | RNK | 64 min |
| Apr 8, 3:58 PM EDT | Severe Thunderstorm Warning | RNK | 47 min |
| Apr 12, 11:47 PM EDT | Special Weather Statement | RNK | 43 min |
| Apr 13, 12:29 AM EDT | Special Weather Statement | RNK | 46 min |
| Apr 14, 2:16 PM EDT | Tornado Watch | SPC | 8 hr |
| Apr 14, 6:29 PM EDT | Severe Thunderstorm Warning | RNK | 61 min |
| Apr 14, 6:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Apr 14, 7:12 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 14, 10:07 PM EDT | Special Weather Statement | RNK | 83 min |
| Apr 14, 10:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 14, 10:14 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 14, 10:27 PM EDT | Severe Thunderstorm Warning | RNK | 78 min |
| Apr 14, 11:09 PM EDT | Severe Thunderstorm Warning | RNK | 66 min |
| Apr 14, 11:27 PM EDT | Areal Flood Advisory | RNK | 112 min |
| Apr 15, 2:58 AM EDT | Wind Advisory | RNK | 15 hr |
| Apr 19, 10:31 AM EDT | Tornado Watch | SPC | 9 hr |
| Apr 19, 1:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 19, 3:46 PM EDT | Areal Flood Advisory | RNK | 6 hr |
| Apr 19, 5:36 PM EDT | Severe Thunderstorm Warning | RNK | 54 min |
| Apr 25, 3:31 PM EDT | Wind Advisory | RNK | 42 hr |
| May 3, 12:58 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 3, 5:22 PM EDT | Special Weather Statement | RNK | 53 min |
| May 3, 5:40 PM EDT | Areal Flood Advisory | RNK | 88 min |
| May 12, 3:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 17, 7:49 AM EDT | Special Weather Statement | RNK | 56 min |
| May 17, 7:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 17, 9:39 PM EDT | Mesoscale Discussion | SPC | 66 min |
| May 25, 9:43 PM EDT | Special Weather Statement | RNK | 62 min |
| May 26, 1:45 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 26, 10:13 PM EDT | Severe Thunderstorm Warning | RNK | 32 min |
| May 29, 1:48 PM EDT | Special Weather Statement | RNK | 42 min |
| May 29, 3:41 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 29, 4:31 PM EDT | Severe Thunderstorm Warning | RNK | 44 min |
| May 29, 4:52 PM EDT | Special Weather Statement | RNK | 38 min |
| May 29, 5:35 PM EDT | Severe Thunderstorm Warning | RNK | 25 min |
| May 31, 12:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 31, 1:29 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| May 31, 3:45 PM EDT | Severe Thunderstorm Warning | RNK | 60 min |
| May 31, 4:39 PM EDT | Severe Thunderstorm Warning | RNK | 66 min |
| May 31, 7:22 PM EDT | Mesoscale Discussion | SPC | 83 min |
| May 31, 9:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 2, 12:24 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 2, 6:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jun 7, 8:21 PM EDT | Flash Flood Watch | RNK | 48 hr |
| Jun 8, 7:48 AM EDT | Areal Flood Advisory | RNK | 4 hr |
| Jun 8, 9:09 AM EDT | Flash Flood Warning | RNK | 6 hr |
| Jun 8, 2:54 PM EDT | Areal Flood Warning | RNK | 6 hr |
| Jun 10, 3:47 AM EDT | Flash Flood Watch | RNK | 17 hr |
| Jun 16, 3:41 PM EDT | Special Weather Statement | RNK | 49 min |
| Jun 18, 4:54 AM EDT | Flash Flood Watch | RNK | 18 hr |
| Jun 24, 5:45 PM EDT | Special Weather Statement | RNK | 60 min |
| Jun 24, 6:28 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 24, 8:55 PM EDT | Special Weather Statement | RNK | 50 min |
| Jul 3, 6:06 PM EDT | Special Weather Statement | RNK | 24 min |
| Jul 4, 8:39 PM EDT | Areal Flood Advisory | RNK | 111 min |
| Jul 5, 4:39 PM EDT | Special Weather Statement | RNK | 36 min |
| Jul 5, 5:17 PM EDT | Severe Thunderstorm Warning | RNK | 41 min |
| Jul 8, 8:41 PM EDT | Special Weather Statement | RNK | 34 min |
| Jul 8, 9:19 PM EDT | Areal Flood Advisory | RNK | 56 min |
| Jul 11, 12:15 PM EDT | Flash Flood Watch | RNK | 6 hr |
| Jul 15, 6:14 PM EDT | Special Weather Statement | RNK | 31 min |
| Jul 15, 6:57 PM EDT | Special Weather Statement | RNK | 33 min |
| Jul 15, 7:12 PM EDT | Areal Flood Advisory | RNK | 84 min |
| Jul 17, 1:29 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 21, 12:51 PM EDT | Special Weather Statement | RNK | 39 min |
| Jul 21, 1:21 PM EDT | Severe Thunderstorm Warning | RNK | 39 min |
| Jul 21, 1:47 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Jul 21, 1:47 PM EDT | Severe Thunderstorm Warning | RNK | 43 min |
| Jul 22, 3:41 AM EDT | Flash Flood Watch | RNK | 32 hr |
| Jul 22, 3:10 PM EDT | Special Weather Statement | RNK | 65 min |
| Jul 22, 3:49 PM EDT | Severe Thunderstorm Warning | RNK | 56 min |
| Jul 31, 5:01 PM EDT | Severe Thunderstorm Warning | RNK | 59 min |
| Aug 1, 3:03 PM EDT | Severe Thunderstorm Warning | RNK | 57 min |
| Aug 1, 4:28 PM EDT | Severe Thunderstorm Warning | RNK | 62 min |
| Aug 9, 2:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 15, 6:44 PM EDT | Severe Thunderstorm Warning | RNK | 61 min |
| Aug 15, 7:25 PM EDT | Severe Thunderstorm Warning | RNK | 32 min |
| Aug 20, 12:48 PM EDT | Special Weather Statement | RNK | 42 min |
| Aug 20, 2:12 PM EDT | Severe Thunderstorm Warning | RNK | 63 min |
| Aug 22, 1:48 PM EDT | Severe Thunderstorm Warning | RNK | 57 min |
| Aug 22, 4:51 PM EDT | Special Weather Statement | RNK | 54 min |
| Aug 23, 3:30 AM EDT | Special Weather Statement | RNK | 60 min |
| Sep 6, 9:53 PM EDT | Special Weather Statement | RNK | 22 min |
| Sep 14, 8:15 PM EDT | Special Weather Statement | RNK | 45 min |
| Sep 28, 1:38 PM EDT | Special Weather Statement | RNK | 37 min |
| Sep 28, 1:41 PM EDT | Severe Thunderstorm Warning | RNK | 49 min |
| Sep 28, 2:29 PM EDT | Severe Thunderstorm Warning | RNK | 31 min |
| Sep 30, 3:11 PM EDT | Special Weather Statement | RNK | 49 min |
| Sep 30, 4:08 PM EDT | Severe Thunderstorm Warning | RNK | 35 min |
| Oct 15, 3:38 PM EDT | Wind Advisory | RNK | 43 hr |
| Oct 18, 2:54 AM EDT | Frost Advisory | RNK | 30 hr |
| Oct 23, 4:38 AM EDT | Frost Advisory | RNK | 28 hr |
| Oct 27, 6:36 AM EDT | Special Weather Statement | RNK | 69 min |
| Oct 31, 4:48 AM EDT | High Wind Watch | RNK | 5 hr |
| Oct 31, 4:48 AM EDT | Wind Advisory | RNK | 28 hr |
| Oct 31, 9:55 AM EDT | High Wind Warning | RNK | 19 hr |
| Oct 31, 11:12 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 31, 1:11 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 31, 3:16 PM EDT | Tornado Watch | SPC | 8 hr |
| Oct 31, 4:30 PM EDT | Severe Thunderstorm Warning | RNK | 60 min |
| Oct 31, 6:27 PM EDT | Areal Flood Advisory | RNK | 68 min |
| Nov 1, 4:40 AM EDT | Frost Advisory | RNK | 8 hr |
| Nov 1, 12:54 PM EDT | Freeze Warning | RNK | 20 hr |
| Nov 23, 4:22 AM EST | Wind Advisory | RNK | 32 hr |
| Nov 26, 2:44 PM EST | High Wind Watch | RNK | 14 hr |
| Nov 27, 4:38 AM EST | High Wind Warning | RNK | 30 hr |
| Dec 1, 3:50 AM EST | Wind Advisory | RNK | 51 hr |
| Dec 3, 2:46 PM EST | Wind Advisory | RNK | 39 hr |
| Dec 12, 4:30 AM EST | Winter Weather Advisory | RNK | 33 hr |
| Dec 30, 5:29 AM EST | Special Weather Statement | RNK | 31 min |
| Dec 30, 6:04 AM EST | Special Weather Statement | RNK | 56 min |
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 archive20182020
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.