Alert archive / Virginia / Northumberland County
Weather alerts in Northumberland County, Virginia, 2020
157 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 157
- Warnings
- 22
- Watches
- 20
- Advisories
- 42
- Busiest month
- August38 alerts
- Busiest day
- August 4, 20206 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 3 tornado warnings covering Northumberland County in 2020 had a tornado report inside them; 3 of 3 tornado reports fell inside a warning, on average 8 minutes after it went out.
Northumberland County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 2 | 33% | 3 | 100% | 8 min |
| Severe thunderstorm warnings | 12 | 10 | 17% | 8 | 100% | 19 min |
| Flash flood warnings | 2 | 1 | 50% | 1 | 100% | 43 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Wakefield, VA: tornado warnings | 60 | 19 | 68% | 39 | 72% | 17 min |
| NWS Wakefield, VA: severe thunderstorm warnings | 170 | 120 | 29% | 237 | 91% | 19 min |
| NWS Wakefield, VA: flash flood warnings | 87 | 57 | 34% | 118 | 92% | 79 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 1, 1:01 AM EST | Coastal Flood Statement | AKQ | 6 hr |
| Jan 4, 5:58 PM EST | Special Weather Statement | AKQ | 47 min |
| Jan 12, 2:00 AM EST | Special Weather Statement | AKQ | 45 min |
| Jan 14, 6:17 AM EST | Special Weather Statement | AKQ | 43 min |
| Feb 5, 3:45 PM EST | Flood Watch | AKQ | 37 hr |
| Feb 6, 2:42 PM EST | Wind Advisory | AKQ | 27 hr |
| Feb 7, 8:36 AM EST | Special Weather Statement | AKQ | 39 min |
| Feb 26, 1:08 AM EST | Dense Fog Advisory | AKQ | 12 hr |
| Feb 26, 8:44 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Feb 26, 11:40 PM EST | Special Weather Statement | AKQ | 65 min |
| Mar 23, 8:35 AM EDT | Coastal Flood Statement | AKQ | 7 hr |
| Mar 25, 3:30 PM EDT | Coastal Flood Advisory | AKQ | 10 hr |
| Mar 31, 5:05 AM EDT | Coastal Flood Advisory | AKQ | 53 hr |
| Apr 1, 2:10 AM EDT | Coastal Flood Warning | AKQ | 8 hr |
| Apr 3, 2:37 PM EDT | Coastal Flood Advisory | AKQ | 33 hr |
| Apr 4, 3:59 AM EDT | Coastal Flood Watch | AKQ | 11 hr |
| Apr 4, 8:41 PM EDT | Coastal Flood Warning | AKQ | 19 hr |
| Apr 5, 4:10 PM EDT | Coastal Flood Advisory | AKQ | 13 hr |
| Apr 7, 2:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 7, 3:57 PM EDT | Severe Thunderstorm Warning | AKQ | 48 min |
| Apr 7, 4:30 PM EDT | Severe Thunderstorm Warning | AKQ | 45 min |
| Apr 7, 5:11 PM EDT | Severe Thunderstorm Warning | AKQ | 34 min |
| Apr 8, 4:30 PM EDT | Coastal Flood Statement | AKQ | 10 hr |
| Apr 9, 3:52 PM EDT | Coastal Flood Statement | AKQ | 14 hr |
| Apr 12, 2:25 PM EDT | Wind Advisory | AKQ | 26 hr |
| Apr 13, 6:46 AM EDT | Mesoscale Discussion | SPC | 89 min |
| Apr 13, 9:34 AM EDT | Severe Thunderstorm Warning | AKQ | 56 min |
| Apr 16, 3:12 PM EDT | Frost Advisory | AKQ | 18 hr |
| Apr 18, 9:31 PM EDT | Frost Advisory | AKQ | 10 hr |
| Apr 25, 3:30 PM EDT | Coastal Flood Statement | AKQ | 17 hr |
| Apr 26, 8:24 PM EDT | Special Weather Statement | AKQ | 51 min |
| Apr 29, 3:23 AM EDT | Flood Watch | AKQ | 39 hr |
| Apr 29, 4:29 PM EDT | Coastal Flood Advisory | AKQ | 18 hr |
| Apr 30, 1:41 PM EDT | Special Weather Statement | AKQ | 49 min |
| Apr 30, 3:05 PM EDT | Coastal Flood Advisory | AKQ | 9 hr |
| May 1, 4:36 AM EDT | Coastal Flood Advisory | AKQ | 7 hr |
| May 5, 3:22 PM EDT | Coastal Flood Statement | AKQ | 13 hr |
| May 8, 10:22 PM EDT | Special Weather Statement | AKQ | 38 min |
| May 18, 6:27 AM EDT | Coastal Flood Watch | AKQ | 29 hr |
| May 19, 6:00 AM EDT | Coastal Flood Warning | AKQ | 46 hr |
| May 20, 3:57 PM EDT | Coastal Flood Advisory | AKQ | 12 hr |
| May 28, 2:09 PM EDT | Special Weather Statement | AKQ | 51 min |
| May 29, 3:24 PM EDT | Special Weather Statement | AKQ | 66 min |
| Jun 6, 8:06 PM EDT | Severe Thunderstorm Warning | AKQ | 39 min |
| Jun 6, 8:36 PM EDT | Special Weather Statement | AKQ | 39 min |
| Jun 6, 8:42 PM EDT | Severe Thunderstorm Warning | AKQ | 48 min |
| Jun 15, 9:06 PM EDT | Coastal Flood Statement | AKQ | 16 hr |
| Jun 16, 3:35 PM EDT | Coastal Flood Advisory | AKQ | 10 hr |
| Jun 17, 10:05 AM EDT | Coastal Flood Statement | AKQ | 7 hr |
| Jun 17, 2:10 PM EDT | Special Weather Statement | AKQ | 65 min |
| Jun 17, 3:25 PM EDT | Flash Flood Warning | AKQ | 3 hr |
| Jun 17, 4:38 PM EDT | Coastal Flood Statement | AKQ | 10 hr |
| Jun 19, 4:15 PM EDT | Severe Thunderstorm Warning | AKQ | 60 min |
| Jun 22, 3:41 PM EDT | Severe Thunderstorm Warning | AKQ | 49 min |
| Jun 25, 5:15 PM EDT | Severe Thunderstorm Warning | AKQ | 45 min |
| Jun 25, 6:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 25, 6:20 PM EDT | Severe Thunderstorm Warning | AKQ | 40 min |
| Jun 25, 7:00 PM EDT | Severe Thunderstorm Warning | AKQ | 29 min |
| Jul 1, 12:44 PM EDT | Special Weather Statement | AKQ | 46 min |
| Jul 1, 1:46 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jul 5, 3:57 PM EDT | Coastal Flood Statement | AKQ | 12 hr |
| Jul 6, 12:33 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 6, 1:38 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 6, 4:33 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 6, 6:25 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 8:39 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 11:52 PM EDT | Special Weather Statement | AKQ | 38 min |
| Jul 7, 12:28 AM EDT | Special Weather Statement | AKQ | 47 min |
| Jul 17, 1:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 17, 3:27 PM EDT | Special Weather Statement | AKQ | 48 min |
| Jul 17, 4:56 PM EDT | Special Weather Statement | AKQ | 34 min |
| Jul 18, 3:09 PM EDT | Heat Advisory | AKQ | 30 hr |
| Jul 19, 2:40 PM EDT | Excessive Heat Warning | AKQ | 30 hr |
| Jul 19, 2:40 PM EDT | Heat Advisory | AKQ | 30 hr |
| Jul 20, 8:46 PM EDT | Heat Advisory | AKQ | 70 hr |
| Jul 21, 4:36 PM EDT | Special Weather Statement | AKQ | 24 min |
| Jul 22, 10:48 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 24, 4:22 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 26, 3:32 PM EDT | Heat Advisory | AKQ | 52 hr |
| Jul 28, 8:01 PM EDT | Severe Thunderstorm Warning | AKQ | 44 min |
| Jul 31, 1:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Aug 2, 3:26 PM EDT | Flash Flood Watch | AKQ | 43 hr |
| Aug 2, 5:44 PM EDT | Tropical Storm Watch | AKQ | 5 hr |
| Aug 2, 6:41 PM EDT | Coastal Flood Watch | AKQ | 23 hr |
| Aug 2, 10:51 PM EDT | Tropical Storm Warning | AKQ | 43 hr |
| Aug 3, 2:15 PM EDT | Special Weather Statement | AKQ | 60 min |
| Aug 3, 5:18 PM EDT | Coastal Flood Advisory | AKQ | 24 hr |
| Aug 4, 1:41 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 4, 2:26 AM EDT | Tornado Watch | SPC | 9 hr |
| Aug 4, 2:27 AM EDT | Tornado Warning | AKQ | 33 min |
| Aug 4, 5:15 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 4, 5:42 AM EDT | Tornado Warning | AKQ | 33 min |
| Aug 4, 6:03 AM EDT | Tornado Warning | AKQ | 22 min |
| Aug 6, 10:43 AM EDT | Flash Flood Watch | AKQ | 15 hr |
| Aug 6, 1:14 PM EDT | Areal Flood Advisory | AKQ | 3 hr |
| Aug 6, 1:27 PM EDT | Flash Flood Warning | AKQ | 3 hr |
| Aug 6, 2:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 7, 2:43 AM EDT | Flash Flood Watch | AKQ | 19 hr |
| Aug 8, 2:07 AM EDT | Special Weather Statement | AKQ | 38 min |
| Aug 8, 2:31 AM EDT | Areal Flood Advisory | AKQ | 3 hr |
| Aug 12, 3:21 PM EDT | Areal Flood Advisory | AKQ | 114 min |
| Aug 12, 5:56 PM EDT | Special Weather Statement | AKQ | 49 min |
| Aug 12, 6:44 PM EDT | Special Weather Statement | AKQ | 46 min |
| Aug 13, 2:25 AM EDT | Flash Flood Watch | AKQ | 17 hr |
| Aug 15, 3:21 AM EDT | Flash Flood Watch | AKQ | 33 hr |
| Aug 15, 3:25 PM EDT | Coastal Flood Statement | AKQ | 10 hr |
| Aug 15, 9:23 PM EDT | Coastal Flood Advisory | AKQ | 8 hr |
| Aug 16, 6:34 AM EDT | Coastal Flood Advisory | AKQ | 8 hr |
| Aug 16, 2:58 PM EDT | Coastal Flood Statement | AKQ | 14 hr |
| Aug 17, 2:23 PM EDT | Coastal Flood Advisory | AKQ | 14 hr |
| Aug 17, 6:40 PM EDT | Special Weather Statement | AKQ | 65 min |
| Aug 17, 7:45 PM EDT | Special Weather Statement | AKQ | 45 min |
| Aug 25, 3:34 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 25, 7:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Aug 25, 8:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 28, 7:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 29, 12:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 29, 10:09 PM EDT | Special Weather Statement | AKQ | 51 min |
| Aug 29, 11:01 PM EDT | Special Weather Statement | AKQ | 29 min |
| Sep 1, 3:50 PM EDT | Coastal Flood Statement | AKQ | 7 hr |
| Sep 2, 7:09 PM EDT | Heat Advisory | AKQ | 25 hr |
| Sep 3, 3:06 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Sep 9, 2:26 PM EDT | Flash Flood Watch | AKQ | 31 hr |
| Sep 10, 5:53 AM EDT | Areal Flood Advisory | AKQ | 2 hr |
| Sep 12, 7:33 PM EDT | Coastal Flood Advisory | AKQ | 7 hr |
| Sep 13, 3:54 AM EDT | Coastal Flood Statement | AKQ | 8 hr |
| Sep 13, 2:54 PM EDT | Coastal Flood Statement | AKQ | 13 hr |
| Sep 17, 3:52 PM EDT | Coastal Flood Watch | AKQ | 62 hr |
| Sep 17, 3:52 PM EDT | Coastal Flood Advisory | AKQ | 5 days |
| Sep 22, 5:17 AM EDT | Coastal Flood Statement | AKQ | 13 hr |
| Sep 22, 5:17 AM EDT | Coastal Flood Advisory | AKQ | 18 hr |
| Sep 22, 12:32 PM EDT | Coastal Flood Advisory | AKQ | 9 hr |
| Sep 29, 11:31 PM EDT | Areal Flood Advisory | AKQ | 3 hr |
| Oct 12, 7:57 AM EDT | Coastal Flood Statement | AKQ | 5 hr |
| Oct 12, 11:46 AM EDT | Coastal Flood Advisory | AKQ | 13 hr |
| Oct 12, 5:51 PM EDT | Coastal Flood Statement | AKQ | 7 hr |
| Oct 13, 6:11 AM EDT | Coastal Flood Statement | AKQ | 13 hr |
| Oct 13, 7:54 PM EDT | Coastal Flood Advisory | AKQ | 5 hr |
| Oct 18, 3:04 AM EDT | Coastal Flood Statement | AKQ | 16 hr |
| Oct 19, 3:20 AM EDT | Coastal Flood Statement | AKQ | 17 hr |
| Oct 21, 12:37 AM EDT | Dense Fog Advisory | AKQ | 9 hr |
| Oct 27, 1:30 AM EDT | Dense Fog Advisory | AKQ | 10 hr |
| Oct 28, 3:27 PM EDT | Wind Advisory | AKQ | 28 hr |
| Oct 28, 3:37 PM EDT | Flood Watch | AKQ | 24 hr |
| Oct 31, 6:31 AM EDT | Coastal Flood Advisory | AKQ | 8 hr |
| Nov 6, 1:29 AM EST | Dense Fog Advisory | AKQ | 9 hr |
| Nov 6, 11:37 PM EST | Dense Fog Advisory | AKQ | 10 hr |
| Nov 11, 10:30 AM EST | Flash Flood Watch | AKQ | 31 hr |
| Nov 15, 3:53 AM EST | Coastal Flood Statement | AKQ | 11 hr |
| Nov 15, 5:35 PM EST | Severe Thunderstorm Watch | SPC | 5 hr |
| Nov 30, 5:10 AM EST | Coastal Flood Statement | AKQ | 8 hr |
| Nov 30, 12:26 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Nov 30, 1:07 PM EST | Tornado Watch | SPC | 6 hr |
| Nov 30, 3:02 PM EST | Mesoscale Discussion | SPC | 88 min |
| Dec 23, 2:48 PM EST | Wind Advisory | AKQ | 35 hr |
| Dec 24, 8:06 PM EST | Areal Flood Advisory | AKQ | 3 hr |
| Dec 24, 11:41 PM EST | Special Weather Statement | AKQ | 49 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 | 12 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 23 |
| Special Weather Statement | 27 |
| Flooding | |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 7 |
| Flood Watch | 3 |
| Areal Flood Advisory | 6 |
| Heat | |
| Excessive Heat Warning | 1 |
| Heat Advisory | 5 |
| Cold | |
| Frost Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
| Tropical | |
| Tropical Storm Warning | 1 |
| Tropical Storm Watch | 1 |
| Coast and beach | |
| Coastal Flood Warning | 3 |
| Coastal Flood Watch | 4 |
| Coastal Flood Advisory | 20 |
| Coastal Flood Statement | 23 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.