Alert archive / Virginia / Northumberland County
Weather alerts in Northumberland County, Virginia, 2011
164 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Northumberland County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 164
- Warnings
- 25
- Watches
- 30
- Advisories
- 27
- Busiest month
- April27 alerts
- Busiest day
- April 5, 20118 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Northumberland County in 2011 had a tornado report inside them.
Northumberland County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 16 | 9 | 44% | 5 | 100% | 24 min |
| Flash flood warnings | 2 | 2 | 0% | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Wakefield, VA: tornado warnings | 84 | 23 | 73% | 43 | 77% | 14 min |
| NWS Wakefield, VA: severe thunderstorm warnings | 241 | 150 | 38% | 386 | 79% | 19 min |
| NWS Wakefield, VA: flash flood warnings | 11 | 8 | 27% | 35 | 86% | 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 10, 5:42 AM EST | Winter Storm Watch | AKQ | 22 hr |
| Jan 10, 5:42 AM EST | Winter Weather Advisory | AKQ | 37 hr |
| Jan 11, 7:03 PM EST | Winter Weather Advisory | AKQ | 6 hr |
| Feb 18, 3:44 AM EST | Fire Weather Watch | AKQ | 11 hr |
| Feb 18, 2:57 PM EST | Red Flag Warning | AKQ | 30 hr |
| Feb 18, 3:34 PM EST | Wind Advisory | AKQ | 27 hr |
| Feb 24, 3:40 PM EST | Wind Advisory | AKQ | 32 hr |
| Feb 25, 9:23 AM EST | Special Weather Statement | AKQ | 52 min |
| Feb 25, 9:24 AM EST | Special Weather Statement | AKQ | 51 min |
| Feb 25, 11:36 AM EST | Mesoscale Discussion | SPC | 84 min |
| Feb 28, 12:49 PM EST | Mesoscale Discussion | SPC | 56 min |
| Mar 6, 12:06 PM EST | Mesoscale Discussion | SPC | 84 min |
| Mar 8, 2:34 PM EST | Flood Watch | AKQ | 59 hr |
| Mar 9, 4:29 AM EST | Coastal Flood Watch | AKQ | 24 hr |
| Mar 10, 4:03 AM EST | Coastal Flood Advisory | AKQ | 29 hr |
| Mar 10, 6:53 PM EST | Severe Thunderstorm Warning | AKQ | 52 min |
| Mar 16, 2:17 AM EDT | Special Weather Statement | AKQ | 58 min |
| Mar 19, 12:39 AM EDT | Special Weather Statement | AKQ | 66 min |
| Mar 21, 7:47 AM EDT | Special Weather Statement | AKQ | 58 min |
| Mar 23, 8:13 PM EDT | Special Weather Statement | AKQ | 62 min |
| Mar 23, 9:28 PM EDT | Special Weather Statement | AKQ | 62 min |
| Mar 23, 9:39 PM EDT | Severe Thunderstorm Warning | AKQ | 21 min |
| Apr 2, 5:01 PM EDT | Special Weather Statement | AKQ | 44 min |
| Apr 2, 6:08 PM EDT | Special Weather Statement | AKQ | 37 min |
| Apr 5, 2:13 AM EDT | Mesoscale Discussion | SPC | 32 min |
| Apr 5, 2:18 AM EDT | Tornado Watch | SPC | 8 hr |
| Apr 5, 3:34 AM EDT | Mesoscale Discussion | SPC | 116 min |
| Apr 5, 4:56 AM EDT | Severe Thunderstorm Warning | AKQ | 64 min |
| Apr 5, 5:28 AM EDT | Severe Thunderstorm Warning | AKQ | 51 min |
| Apr 5, 5:43 AM EDT | Severe Thunderstorm Warning | AKQ | 62 min |
| Apr 5, 9:57 AM EDT | Special Weather Statement | AKQ | 63 min |
| Apr 5, 10:17 AM EDT | Severe Thunderstorm Warning | AKQ | 58 min |
| Apr 12, 1:56 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Apr 12, 2:08 PM EDT | Special Weather Statement | AKQ | 22 min |
| Apr 12, 3:06 PM EDT | Special Weather Statement | AKQ | 39 min |
| Apr 15, 10:55 PM EDT | Coastal Flood Watch | AKQ | 16 hr |
| Apr 16, 7:05 AM EDT | Coastal Flood Advisory | AKQ | 23 hr |
| Apr 16, 12:02 PM EDT | Tornado Watch | SPC | 11 hr |
| Apr 16, 12:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Apr 16, 6:41 PM EDT | Severe Thunderstorm Warning | AKQ | 49 min |
| Apr 16, 8:12 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Apr 27, 4:18 PM EDT | Special Weather Statement | AKQ | 42 min |
| Apr 28, 7:38 AM EDT | Tornado Watch | SPC | 7 hr |
| Apr 28, 10:44 AM EDT | Mesoscale Discussion | SPC | 61 min |
| Apr 28, 2:00 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Apr 28, 2:41 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 28, 6:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Apr 28, 7:56 PM EDT | Severe Thunderstorm Warning | AKQ | 49 min |
| Apr 28, 8:27 PM EDT | Mesoscale Discussion | SPC | 33 min |
| May 6, 6:50 PM EDT | Special Weather Statement | AKQ | 55 min |
| May 11, 3:29 PM EDT | Coastal Flood Statement | AKQ | 23 hr |
| May 12, 4:22 PM EDT | Coastal Flood Statement | AKQ | 27 hr |
| May 13, 6:59 PM EDT | Coastal Flood Advisory | AKQ | 6 days |
| May 15, 1:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 15, 11:03 PM EDT | Special Weather Statement | AKQ | 42 min |
| May 17, 11:14 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 18, 4:36 AM EDT | Coastal Flood Advisory | AKQ | 23 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 23, 3:16 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 23, 7:02 PM EDT | Mesoscale Discussion | SPC | 58 min |
| May 24, 12:42 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 27, 3:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jun 1, 2:24 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 1, 8:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 10, 1:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 11, 5:56 PM EDT | Severe Thunderstorm Warning | AKQ | 34 min |
| Jun 12, 1:48 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 16, 6:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 16, 7:37 PM EDT | Special Weather Statement | AKQ | 53 min |
| Jun 17, 4:31 AM EDT | Coastal Flood Advisory | AKQ | 5 hr |
| Jun 19, 7:42 AM EDT | Special Weather Statement | AKQ | 63 min |
| Jun 24, 1:05 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 24, 2:25 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 24, 4:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 3, 8:41 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jul 3, 9:27 PM EDT | Severe Thunderstorm Warning | AKQ | 63 min |
| Jul 3, 10:29 PM EDT | Special Weather Statement | AKQ | 61 min |
| Jul 4, 2:34 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 4, 6:44 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Jul 4, 8:04 PM EDT | Special Weather Statement | AKQ | 56 min |
| Jul 8, 3:56 AM EDT | Flash Flood Watch | AKQ | 20 hr |
| Jul 8, 9:07 PM EDT | Areal Flood Advisory | AKQ | 113 min |
| Jul 11, 3:35 PM EDT | Heat Advisory | AKQ | 28 hr |
| Jul 11, 10:25 PM EDT | Special Weather Statement | AKQ | 65 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 13, 4:54 PM EDT | Special Weather Statement | AKQ | 51 min |
| Jul 13, 5:40 PM EDT | Special Weather Statement | AKQ | 65 min |
| Jul 19, 8:34 PM EDT | Special Weather Statement | AKQ | 36 min |
| Jul 19, 9:05 PM EDT | Special Weather Statement | AKQ | 55 min |
| Jul 19, 9:19 PM EDT | Severe Thunderstorm Warning | AKQ | 41 min |
| Jul 19, 9:54 PM EDT | Severe Thunderstorm Warning | AKQ | 51 min |
| Jul 20, 3:23 AM EDT | Excessive Heat Watch | AKQ | 24 hr |
| Jul 20, 4:26 PM EDT | Excessive Heat Warning | AKQ | 3 days |
| Jul 23, 3:44 PM EDT | Heat Advisory | AKQ | 28 hr |
| Jul 25, 5:15 PM EDT | Severe Thunderstorm Warning | AKQ | 45 min |
| Jul 25, 5:49 PM EDT | Special Weather Statement | AKQ | 41 min |
| Jul 28, 2:00 PM EDT | Heat Advisory | AKQ | 30 hr |
| Aug 1, 9:03 PM EDT | Severe Thunderstorm Warning | AKQ | 42 min |
| Aug 3, 1:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Aug 7, 11:40 AM EDT | Heat Advisory | AKQ | 7 hr |
| Aug 14, 10:35 PM EDT | Special Weather Statement | AKQ | 55 min |
| Aug 15, 7:12 PM EDT | Special Weather Statement | AKQ | 63 min |
| Aug 19, 3:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Aug 21, 5:00 AM EDT | Hurricane Watch | NHC | 5 days |
| Aug 21, 11:00 AM EDT | Hurricane Warning | NHC | 7 days |
| Aug 21, 2:06 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 21, 3:25 PM EDT | Special Weather Statement | AKQ | 50 min |
| Aug 21, 5:50 PM EDT | Severe Thunderstorm Warning | AKQ | 18 min |
| Aug 21, 6:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Aug 25, 5:14 AM EDT | Hurricane Watch | AKQ | 24 hr |
| Aug 25, 12:37 PM EDT | Hurricane Local Statement | AKQ | 65 hr |
| Aug 25, 3:23 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 25, 5:48 PM EDT | Hurricane Warning | AKQ | 66 hr |
| Aug 25, 5:54 PM EDT | Severe Thunderstorm Warning | AKQ | 51 min |
| Aug 25, 6:24 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Aug 25, 8:01 PM EDT | Flash Flood Watch | AKQ | 4 hr |
| Aug 25, 11:51 PM EDT | Flood Watch | AKQ | 52 hr |
| Aug 26, 5:27 AM EDT | Tropical Storm Warning | AKQ | 57 hr |
| Aug 27, 12:32 AM EDT | Tornado Watch | SPC | 10 hr |
| Aug 27, 10:41 AM EDT | Tornado Watch | SPC | 9 hr |
| Aug 27, 12:52 PM EDT | Areal Flood Warning | AKQ | 15 hr |
| Aug 27, 1:01 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Sep 6, 3:56 PM EDT | Special Weather Statement | AKQ | 49 min |
| Sep 6, 8:07 PM EDT | Special Weather Statement | AKQ | 53 min |
| Sep 7, 12:42 PM EDT | Areal Flood Advisory | AKQ | 78 min |
| Sep 7, 4:03 PM EDT | Coastal Flood Advisory | AKQ | 12 hr |
| Sep 8, 7:34 AM EDT | Areal Flood Advisory | AKQ | 86 min |
| Sep 8, 7:41 PM EDT | Flash Flood Warning | AKQ | 3 hr |
| Sep 8, 10:45 PM EDT | Flash Flood Warning | AKQ | 3 hr |
| Sep 9, 9:42 AM EDT | Special Weather Statement | AKQ | 48 min |
| Sep 9, 5:14 PM EDT | Areal Flood Advisory | AKQ | 4 hr |
| Sep 11, 2:04 PM EDT | Tornado Warning | AKQ | 26 min |
| Sep 11, 6:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Sep 12, 10:52 PM EDT | Special Weather Statement | AKQ | 53 min |
| Sep 19, 3:45 PM EDT | Coastal Flood Advisory | AKQ | 9 hr |
| Sep 22, 2:57 PM EDT | Flash Flood Watch | AKQ | 29 hr |
| Sep 27, 7:17 PM EDT | Special Weather Statement | AKQ | 58 min |
| Sep 28, 7:01 AM EDT | Special Weather Statement | AKQ | 44 min |
| Sep 29, 4:39 PM EDT | Coastal Flood Statement | AKQ | 11 hr |
| Sep 30, 11:24 AM EDT | Coastal Flood Statement | AKQ | 9 hr |
| Sep 30, 4:46 PM EDT | Special Weather Statement | AKQ | 59 min |
| Oct 12, 4:28 AM EDT | Coastal Flood Statement | AKQ | 8 hr |
| Oct 13, 2:33 AM EDT | Coastal Flood Advisory | AKQ | 4 hr |
| Oct 13, 11:18 AM EDT | Coastal Flood Advisory | AKQ | 9 hr |
| Oct 13, 4:28 PM EDT | Tornado Watch | SPC | 4 hr |
| Oct 13, 6:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Oct 13, 11:52 PM EDT | Coastal Flood Advisory | AKQ | 21 hr |
| Oct 19, 4:12 PM EDT | Coastal Flood Advisory | AKQ | 8 hr |
| Oct 19, 6:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 29, 7:48 AM EDT | Coastal Flood Advisory | AKQ | 13 hr |
| Nov 9, 3:15 AM EST | Dense Fog Advisory | AKQ | 7 hr |
| Nov 9, 10:29 PM EST | Dense Fog Advisory | AKQ | 11 hr |
| Nov 16, 1:27 PM EST | Special Weather Statement | AKQ | 48 min |
| Nov 23, 4:39 AM EST | Special Weather Statement | AKQ | 51 min |
| Nov 23, 5:41 AM EST | Special Weather Statement | AKQ | 49 min |
| Dec 5, 2:21 AM EST | Dense Fog Advisory | AKQ | 7 hr |
| Dec 7, 5:56 PM EST | Severe Thunderstorm Watch | SPC | 4 hr |
| Dec 27, 2:23 PM EST | Coastal Flood Statement | AKQ | 9 hr |
| Dec 27, 4:48 PM EST | Special Weather Statement | AKQ | 42 min |
| Dec 27, 5:32 PM EST | Special Weather Statement | AKQ | 43 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 | 16 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 11 |
| Tornado Watch | 7 |
| Mesoscale Discussion | 35 |
| Special Weather Statement | 40 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 3 |
| Flood Watch | 2 |
| Areal Flood Advisory | 4 |
| Winter | |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 2 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 4 |
| Wind and dust | |
| Wind Advisory | 2 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
| Tropical | |
| Hurricane Warning | 2 |
| Tropical Storm Warning | 1 |
| Hurricane Watch | 2 |
| Hurricane Local Statement | 1 |
| Coast and beach | |
| Coastal Flood Watch | 2 |
| Coastal Flood Advisory | 12 |
| Coastal Flood Statement | 6 |
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.