Alert archive / Virginia / Rockingham County
Weather alerts in Rockingham County, Virginia, 2011
213 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Rockingham County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 213
- Warnings
- 82
- Watches
- 43
- Advisories
- 27
- Busiest month
- April48 alerts
- Busiest day
- April 16, 201116 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 7 tornado warnings covering Rockingham County in 2011 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 7 minutes after it went out.
Rockingham County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 7 | 2 | 71% | 2 | 100% | 7 min |
| Severe thunderstorm warnings | 41 | 33 | 20% | 27 | 59% | 19 min |
| Flash flood warnings | 16 | 7 | 56% | 3 | 67% | 68 min |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Baltimore/Washington: tornado warnings | 96 | 27 | 72% | 45 | 67% | 11 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 440 | 335 | 24% | 963 | 78% | 18 min |
| NWS Baltimore/Washington: flash flood warnings | 170 | 99 | 42% | 341 | 84% | 121 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 10, 9:39 PM EST | Winter Weather Advisory | LWX | 55 hr |
| Jan 17, 2:44 PM EST | Winter Weather Advisory | LWX | 20 hr |
| Jan 25, 10:16 AM EST | Winter Storm Watch | LWX | 18 hr |
| Jan 25, 6:02 PM EST | Winter Storm Warning | LWX | 29 hr |
| Jan 26, 11:19 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 31, 2:40 PM EST | Winter Weather Advisory | LWX | 21 hr |
| Feb 2, 3:45 AM EST | Wind Advisory | LWX | 19 hr |
| Feb 4, 2:44 PM EST | Freezing Rain Advisory | LWX | 22 hr |
| Feb 5, 5:22 PM EST | Special Weather Statement | LWX | 23 min |
| Feb 8, 3:26 AM EST | Wind Advisory | LWX | 13 hr |
| Feb 13, 11:19 AM EST | Fire Weather Watch | LWX | 15 hr |
| Feb 14, 2:45 AM EST | Wind Advisory | LWX | 22 hr |
| Feb 14, 2:46 AM EST | Red Flag Warning | LWX | 15 hr |
| Feb 18, 3:16 AM EST | Fire Weather Watch | LWX | 11 hr |
| Feb 18, 10:30 AM EST | High Wind Watch | LWX | 7 hr |
| Feb 18, 2:03 PM EST | Red Flag Warning | LWX | 31 hr |
| Feb 18, 5:22 PM EST | High Wind Warning | LWX | 26 hr |
| Feb 19, 6:33 PM EST | Wind Advisory | LWX | 5 hr |
| Feb 21, 11:57 AM EST | Winter Weather Advisory | LWX | 18 hr |
| Feb 24, 4:05 AM EST | High Wind Watch | LWX | 10 hr |
| Feb 24, 1:41 PM EST | Wind Advisory | LWX | 24 hr |
| Feb 24, 8:36 PM EST | High Wind Warning | LWX | 22 hr |
| Feb 28, 8:36 AM EST | Mesoscale Discussion | SPC | 24 min |
| Feb 28, 8:57 AM EST | Tornado Watch | SPC | 9 hr |
| Mar 5, 3:16 AM EST | Flood Watch | LWX | 43 hr |
| Mar 6, 2:37 PM EST | Winter Weather Advisory | LWX | 12 hr |
| Mar 8, 3:14 AM EST | Flood Watch | LWX | 65 hr |
| Mar 10, 1:25 PM EST | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 10, 5:02 PM EST | Areal Flood Warning | LWX | 3 hr |
| Mar 23, 3:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Mar 23, 4:13 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Mar 23, 5:39 PM EDT | Severe Thunderstorm Warning | LWX | 36 min |
| Mar 23, 6:55 PM EDT | Severe Thunderstorm Warning | LWX | 35 min |
| Mar 23, 7:51 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Mar 25, 1:58 PM EDT | Winter Storm Watch | LWX | 14 hr |
| Mar 26, 4:09 AM EDT | Winter Weather Advisory | LWX | 30 hr |
| Mar 29, 3:18 PM EDT | Winter Weather Advisory | LWX | 21 hr |
| Apr 3, 8:18 PM EDT | Special Weather Statement | LWX | 27 min |
| Apr 4, 8:34 AM EDT | Wind Advisory | LWX | 22 hr |
| Apr 12, 6:42 PM EDT | Severe Thunderstorm Warning | LWX | 33 min |
| Apr 12, 6:54 PM EDT | Severe Thunderstorm Warning | LWX | 26 min |
| Apr 12, 8:07 PM EDT | Flash Flood Warning | LWX | 5 hr |
| Apr 15, 4:34 AM EDT | Flash Flood Watch | LWX | 41 hr |
| Apr 15, 11:54 AM EDT | Wind Advisory | LWX | 29 hr |
| Apr 16, 12:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Apr 16, 12:53 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| Apr 16, 1:29 PM EDT | Tornado Watch | SPC | 8 hr |
| Apr 16, 1:38 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| Apr 16, 1:48 PM EDT | Tornado Warning | LWX | 27 min |
| Apr 16, 1:59 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Apr 16, 2:04 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| Apr 16, 2:39 PM EDT | Areal Flood Warning | LWX | 5 hr |
| Apr 16, 3:01 PM EDT | Tornado Warning | LWX | 44 min |
| Apr 16, 3:43 PM EDT | Tornado Warning | LWX | 32 min |
| Apr 16, 3:54 PM EDT | Severe Thunderstorm Warning | LWX | 36 min |
| Apr 16, 4:29 PM EDT | Mesoscale Discussion | SPC | 31 min |
| Apr 16, 4:58 PM EDT | Areal Flood Warning | LWX | 4 hr |
| Apr 16, 5:24 PM EDT | Special Weather Statement | LWX | 36 min |
| Apr 16, 6:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Apr 16, 6:43 PM EDT | River Flood Warning | LWX | 5 hr |
| Apr 16, 9:20 PM EDT | Wind Advisory | LWX | 22 hr |
| Apr 16, 10:24 PM EDT | River Flood Warning | LWX | 16 hr |
| Apr 19, 3:21 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Apr 21, 2:05 PM EDT | Flood Watch | LWX | 44 hr |
| Apr 23, 4:06 AM EDT | Flash Flood Watch | LWX | 18 hr |
| Apr 24, 2:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 24, 9:02 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Apr 25, 7:08 PM EDT | Special Weather Statement | LWX | 37 min |
| Apr 26, 1:49 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Apr 26, 2:09 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 26, 4:34 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Apr 26, 7:44 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Apr 26, 8:45 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Apr 27, 9:51 AM EDT | Flash Flood Watch | LWX | 29 hr |
| Apr 27, 1:23 PM EDT | Tornado Watch | SPC | 5 hr |
| Apr 27, 4:39 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Apr 27, 6:15 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 28, 12:27 AM EDT | Mesoscale Discussion | SPC | 63 min |
| Apr 28, 12:41 AM EDT | Tornado Watch | SPC | 7 hr |
| Apr 28, 1:09 AM EDT | Severe Thunderstorm Warning | LWX | 66 min |
| Apr 28, 1:33 AM EDT | Flash Flood Warning | LWX | 4 hr |
| Apr 28, 2:10 AM EDT | Severe Thunderstorm Warning | LWX | 65 min |
| Apr 28, 2:53 AM EDT | Tornado Warning | LWX | 36 min |
| Apr 28, 3:04 AM EDT | Flash Flood Warning | LWX | 7 hr |
| Apr 28, 3:50 AM EDT | Tornado Warning | LWX | 40 min |
| May 13, 1:43 PM EDT | Severe Thunderstorm Warning | LWX | 33 min |
| May 13, 2:31 PM EDT | Flash Flood Warning | LWX | 5 hr |
| May 16, 9:00 PM EDT | Flash Flood Warning | LWX | 4 hr |
| May 16, 9:38 PM EDT | Special Weather Statement | LWX | 67 min |
| May 17, 3:45 AM EDT | Flash Flood Watch | LWX | 44 hr |
| May 17, 8:38 AM EDT | Flash Flood Warning | LWX | 4 hr |
| May 17, 12:20 PM EDT | Areal Flood Warning | LWX | 6 hr |
| May 17, 5:39 PM EDT | Flash Flood Warning | LWX | 3 hr |
| May 17, 7:03 PM EDT | Areal Flood Warning | LWX | 6 hr |
| May 17, 7:41 PM EDT | Flash Flood Warning | LWX | 6 hr |
| May 17, 8:47 PM EDT | Flash Flood Warning | LWX | 6 hr |
| May 17, 9:27 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| May 17, 11:49 PM EDT | Flash Flood Warning | LWX | 4 hr |
| May 18, 5:17 AM EDT | Areal Flood Warning | LWX | 11 min |
| May 18, 8:47 AM EDT | Areal Flood Warning | LWX | 30 hr |
| May 18, 11:55 AM EDT | Mesoscale Discussion | SPC | 65 min |
| May 18, 12:55 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 18, 3:08 PM EDT | Mesoscale Discussion | SPC | 67 min |
| May 18, 6:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| May 19, 4:36 AM EDT | Flash Flood Watch | LWX | 14 hr |
| May 22, 10:49 PM EDT | Special Weather Statement | LWX | 41 min |
| May 22, 11:11 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| May 23, 10:33 AM EDT | Mesoscale Discussion | SPC | 87 min |
| May 23, 10:48 AM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 23, 2:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 24, 12:42 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 26, 1:42 PM EDT | Severe Thunderstorm Watch | SPC | 11 hr |
| May 26, 5:16 PM EDT | Severe Thunderstorm Warning | LWX | 59 min |
| May 26, 6:17 PM EDT | Severe Thunderstorm Warning | LWX | 18 min |
| May 26, 6:21 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| May 26, 6:51 PM EDT | Severe Thunderstorm Warning | LWX | 28 min |
| May 26, 10:02 PM EDT | Special Weather Statement | LWX | 28 min |
| May 26, 10:53 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| May 26, 11:07 PM EDT | Tornado Warning | LWX | 38 min |
| May 26, 11:18 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| May 26, 11:23 PM EDT | Flash Flood Warning | LWX | 3 hr |
| May 26, 11:52 PM EDT | Severe Thunderstorm Warning | LWX | 53 min |
| May 27, 12:57 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 27, 5:57 PM EDT | Flash Flood Warning | LWX | 2 hr |
| Jun 1, 2:24 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 1, 4:41 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| Jun 1, 6:27 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 8, 6:39 PM EDT | Special Weather Statement | LWX | 36 min |
| Jun 8, 6:41 PM EDT | Severe Thunderstorm Warning | LWX | 34 min |
| Jun 8, 7:13 PM EDT | Special Weather Statement | LWX | 32 min |
| Jun 8, 7:39 PM EDT | Severe Thunderstorm Warning | LWX | 22 min |
| Jun 9, 12:53 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 9, 1:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 9, 4:31 PM EDT | Special Weather Statement | LWX | 29 min |
| Jun 9, 4:34 PM EDT | Special Weather Statement | LWX | 26 min |
| Jun 9, 4:40 PM EDT | Severe Thunderstorm Warning | LWX | 50 min |
| Jun 9, 4:54 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Jun 9, 5:11 PM EDT | Special Weather Statement | LWX | 19 min |
| Jun 9, 5:41 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| Jun 9, 6:11 PM EDT | Special Weather Statement | LWX | 34 min |
| Jun 9, 6:17 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 9, 6:38 PM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| Jun 11, 12:52 PM EDT | Special Weather Statement | LWX | 23 min |
| Jun 11, 1:13 PM EDT | Special Weather Statement | LWX | 32 min |
| Jun 12, 12:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 12, 1:48 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 17, 4:06 PM EDT | Severe Thunderstorm Warning | LWX | 26 min |
| Jun 19, 6:42 PM EDT | Flash Flood Watch | LWX | 10 hr |
| Jun 21, 10:00 PM EDT | Flash Flood Warning | LWX | 110 min |
| Jun 28, 2:44 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jul 3, 4:21 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 4, 1:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 4, 3:19 PM EDT | Special Weather Statement | LWX | 26 min |
| Jul 7, 3:14 PM EDT | Flash Flood Watch | LWX | 29 hr |
| Jul 8, 11:44 AM EDT | Mesoscale Discussion | SPC | 61 min |
| Jul 8, 1:59 PM EDT | Special Weather Statement | LWX | 46 min |
| Jul 8, 2:27 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Jul 8, 3:09 PM EDT | Tornado Warning | LWX | 36 min |
| Jul 9, 4:19 AM EDT | Dense Fog Advisory | LWX | 4 hr |
| Jul 11, 5:47 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 11, 5:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 11, 6:54 PM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| Jul 11, 7:44 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Jul 13, 1:43 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 13, 2:21 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 13, 4:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jul 19, 12:12 PM EDT | Excessive Heat Watch | LWX | 27 hr |
| Jul 20, 3:19 PM EDT | Excessive Heat Warning | LWX | 31 hr |
| Jul 20, 3:19 PM EDT | Excessive Heat Warning | LWX | 54 hr |
| Jul 20, 8:16 PM EDT | Heat Advisory | LWX | 24 hr |
| Jul 21, 3:38 PM EDT | Heat Advisory | LWX | 52 hr |
| Jul 22, 5:00 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Jul 22, 5:28 PM EDT | Flash Flood Warning | LWX | 118 min |
| Jul 22, 6:14 PM EDT | Special Weather Statement | LWX | 21 min |
| Jul 22, 7:06 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Jul 22, 7:45 PM EDT | Special Weather Statement | LWX | 30 min |
| Jul 22, 8:12 PM EDT | Severe Thunderstorm Warning | LWX | 24 min |
| Jul 28, 12:53 PM EDT | Heat Advisory | LWX | 31 hr |
| Aug 1, 3:22 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Aug 7, 4:05 PM EDT | Severe Thunderstorm Warning | LWX | 25 min |
| Aug 14, 3:23 AM EDT | Flash Flood Watch | LWX | 20 hr |
| Aug 14, 1:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Aug 14, 3:47 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Aug 14, 4:20 PM EDT | Special Weather Statement | LWX | 25 min |
| Aug 21, 12:52 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 25, 1:17 PM EDT | Special Weather Statement | LWX | 28 min |
| Aug 25, 2:09 PM EDT | Special Weather Statement | LWX | 51 min |
| Aug 30, 5:44 AM EDT | Dense Fog Advisory | LWX | 4 hr |
| Sep 3, 1:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Sep 3, 3:17 PM EDT | Severe Thunderstorm Warning | LWX | 24 min |
| Sep 4, 3:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Sep 5, 4:06 AM EDT | Flash Flood Watch | LWX | 5 days |
| Sep 11, 6:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Sep 14, 4:20 PM EDT | Special Weather Statement | LWX | 40 min |
| Sep 14, 4:52 PM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Sep 14, 5:21 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Sep 14, 5:34 PM EDT | Flash Flood Warning | LWX | 87 min |
| Sep 14, 7:02 PM EDT | Special Weather Statement | LWX | 43 min |
| Sep 14, 7:10 PM EDT | Severe Thunderstorm Warning | LWX | 33 min |
| Sep 23, 9:31 PM EDT | Dense Fog Advisory | LWX | 11 hr |
| Oct 7, 2:47 PM EDT | Dense Fog Advisory | LWX | 15 hr |
| Oct 14, 6:48 PM EDT | Wind Advisory | LWX | 23 hr |
| Oct 22, 1:51 PM EDT | Frost Advisory | LWX | 19 hr |
| Oct 28, 3:36 AM EDT | Winter Storm Watch | LWX | 15 hr |
| Oct 28, 2:31 PM EDT | Winter Storm Warning | LWX | 27 hr |
| Oct 29, 12:34 AM EDT | Mesoscale Discussion | SPC | 6 hr |
| Oct 29, 10:32 AM EDT | Freeze Warning | LWX | 22 hr |
| Nov 23, 3:12 AM EST | Wind Advisory | LWX | 16 hr |
| Nov 28, 6:00 PM EST | Flood Watch | LWX | 16 hr |
| Dec 6, 1:45 PM EST | Winter Storm Watch | LWX | 15 hr |
| Dec 6, 8:24 PM EST | Flood Watch | LWX | 29 hr |
| Dec 7, 4:30 AM EST | Winter Weather Advisory | LWX | 20 hr |
| Dec 7, 5:55 PM EST | Areal Flood Warning | LWX | 5 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 archive20102012
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.