Alert archive / Virginia / Arlington County
Weather alerts in Arlington County, Virginia, 2018
198 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Arlington County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 198
- Warnings
- 42
- Watches
- 44
- Advisories
- 81
- Busiest month
- September37 alerts
- Busiest day
- May 14, 20188 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Arlington County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 6 | 6 | 0% | 2 | 100% | 25 min |
| Flash flood warnings | 4 | 3 | 25% | 1 | 100% | 1 min |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Baltimore/Washington: tornado warnings | 19 | 1 | 95% | 4 | 25% | 1 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 312 | 208 | 33% | 690 | 70% | 20 min |
| NWS Baltimore/Washington: flash flood warnings | 87 | 38 | 56% | 129 | 89% | 103 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 3, 3:34 AM EST | Winter Weather Advisory | LWX | 35 hr |
| Jan 4, 3:36 AM EST | Wind Chill Advisory | LWX | 32 hr |
| Jan 4, 12:47 PM EST | Wind Advisory | LWX | 5 hr |
| Jan 5, 3:45 AM EST | Wind Chill Advisory | LWX | 54 hr |
| Jan 6, 3:55 AM EST | Wind Chill Advisory | LWX | 26 hr |
| Jan 7, 2:46 PM EST | Winter Weather Advisory | LWX | 33 hr |
| Jan 9, 4:32 AM EST | Dense Fog Advisory | LWX | 4 hr |
| Jan 15, 1:47 PM EST | Winter Weather Advisory | LWX | 46 hr |
| Feb 3, 3:00 PM EST | Winter Weather Advisory | LWX | 28 hr |
| Feb 6, 4:02 AM EST | Winter Weather Advisory | LWX | 38 hr |
| Feb 10, 3:38 AM EST | Flood Watch | LWX | 36 hr |
| Feb 16, 9:12 PM EST | Winter Weather Advisory | LWX | 31 hr |
| Feb 23, 8:30 PM EST | Dense Fog Advisory | LWX | 15 hr |
| Feb 25, 10:46 PM EST | Dense Fog Advisory | LWX | 6 hr |
| Feb 28, 2:52 PM EST | High Wind Watch | LWX | 21 hr |
| Mar 1, 4:06 AM EST | High Wind Warning | LWX | 45 hr |
| Mar 1, 10:37 PM EST | Special Weather Statement | LWX | 7 hr |
| Mar 2, 7:57 PM EST | Wind Advisory | LWX | 10 hr |
| Mar 5, 1:25 AM EST | Coastal Flood Advisory | LWX | 68 hr |
| Mar 6, 2:07 PM EST | Coastal Flood Warning | LWX | 31 hr |
| Mar 19, 12:06 PM EDT | Winter Storm Watch | LWX | 25 hr |
| Mar 20, 10:00 AM EDT | Special Weather Statement | LWX | 15 min |
| Mar 20, 12:47 PM EDT | Winter Storm Warning | LWX | 31 hr |
| Mar 30, 3:44 AM EDT | Coastal Flood Advisory | LWX | 7 hr |
| Apr 3, 5:33 PM EDT | Wind Advisory | LWX | 25 hr |
| Apr 11, 1:34 PM EDT | Fire Weather Watch | LWX | 14 hr |
| Apr 12, 3:42 AM EDT | Red Flag Warning | LWX | 16 hr |
| Apr 16, 3:01 AM EDT | Coastal Flood Advisory | LWX | 23 hr |
| Apr 16, 3:34 AM EDT | Flash Flood Warning | LWX | 2 hr |
| Apr 16, 5:39 AM EDT | Areal Flood Warning | LWX | 6 hr |
| Apr 24, 9:34 PM EDT | Coastal Flood Advisory | LWX | 16 hr |
| Apr 29, 3:18 PM EDT | Fire Weather Watch | LWX | 12 hr |
| Apr 30, 3:32 AM EDT | Red Flag Warning | LWX | 16 hr |
| May 10, 12:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| May 10, 1:14 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 10, 4:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| May 12, 2:47 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 12, 7:46 PM EDT | Severe Thunderstorm Warning | LWX | 22 min |
| May 13, 7:00 PM EDT | Mesoscale Discussion | SPC | 60 min |
| May 14, 6:24 AM EDT | Coastal Flood Advisory | LWX | 4 hr |
| May 14, 11:56 AM EDT | Mesoscale Discussion | SPC | 64 min |
| May 14, 12:29 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 14, 3:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 14, 6:07 PM EDT | Severe Thunderstorm Warning | LWX | 53 min |
| May 14, 6:56 PM EDT | Flash Flood Warning | LWX | 3 hr |
| May 14, 7:00 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| May 14, 7:22 PM EDT | Mesoscale Discussion | SPC | 53 min |
| May 15, 4:33 AM EDT | Flash Flood Watch | LWX | 20 hr |
| May 15, 5:43 PM EDT | Mesoscale Discussion | SPC | 92 min |
| May 15, 5:54 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 15, 8:34 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| May 15, 8:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| May 15, 9:09 PM EDT | Areal Flood Warning | LWX | 111 min |
| May 16, 7:48 AM EDT | Coastal Flood Advisory | LWX | 3 hr |
| May 16, 1:40 PM EDT | Flood Watch | LWX | 3 days |
| May 17, 7:36 AM EDT | Coastal Flood Advisory | LWX | 4 hr |
| May 17, 10:34 AM EDT | Coastal Flood Watch | LWX | 42 hr |
| May 17, 3:50 PM EDT | Coastal Flood Advisory | LWX | 3 days |
| May 19, 1:37 AM EDT | Areal Flood Warning | LWX | 15 hr |
| May 22, 1:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 22, 2:33 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 22, 4:43 PM EDT | Areal Flood Warning | LWX | 4 hr |
| May 22, 4:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| May 27, 4:25 AM EDT | Flash Flood Watch | LWX | 16 hr |
| May 27, 1:29 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 28, 8:51 PM EDT | Coastal Flood Advisory | LWX | 15 hr |
| May 31, 4:06 AM EDT | Flash Flood Watch | LWX | 17 hr |
| Jun 2, 3:13 AM EDT | Flash Flood Watch | LWX | 25 hr |
| Jun 3, 4:11 AM EDT | Flood Watch | LWX | 14 hr |
| Jun 3, 2:44 PM EDT | Areal Flood Warning | LWX | 7 hr |
| Jun 3, 2:46 PM EDT | Coastal Flood Watch | LWX | 44 min |
| Jun 3, 3:30 PM EDT | Coastal Flood Advisory | LWX | 50 hr |
| Jun 3, 6:03 PM EDT | Flood Watch | LWX | 3 hr |
| Jun 7, 6:55 AM EDT | Coastal Flood Advisory | LWX | 23 hr |
| Jun 9, 1:34 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 3:47 AM EDT | Flash Flood Watch | LWX | 24 hr |
| Jun 11, 2:53 PM EDT | Coastal Flood Advisory | LWX | 18 hr |
| Jun 12, 2:29 PM EDT | Coastal Flood Advisory | LWX | 20 hr |
| Jun 18, 9:42 AM EDT | Heat Advisory | LWX | 10 hr |
| Jun 19, 12:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 19, 2:16 PM EDT | Severe Thunderstorm Warning | LWX | 29 min |
| Jun 22, 12:30 PM EDT | Coastal Flood Advisory | LWX | 26 hr |
| Jun 23, 2:15 PM EDT | Coastal Flood Advisory | LWX | 19 hr |
| Jun 23, 5:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 24, 2:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 26, 9:41 PM EDT | Coastal Flood Advisory | LWX | 39 hr |
| Jun 27, 7:37 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 30, 2:14 PM EDT | Heat Advisory | LWX | 27 hr |
| Jul 1, 2:10 PM EDT | Heat Advisory | LWX | 30 hr |
| Jul 2, 1:40 PM EDT | Heat Advisory | LWX | 30 hr |
| Jul 3, 2:16 PM EDT | Excessive Heat Warning | LWX | 6 hr |
| Jul 5, 9:56 AM EDT | Flash Flood Watch | LWX | 17 hr |
| Jul 8, 6:40 AM EDT | Coastal Flood Advisory | LWX | 23 hr |
| Jul 13, 2:10 AM EDT | Coastal Flood Advisory | LWX | 9 hr |
| Jul 17, 3:29 PM EDT | Areal Flood Warning | LWX | 3 hr |
| Jul 21, 2:46 AM EDT | Coastal Flood Advisory | LWX | 4 days |
| Jul 21, 5:05 AM EDT | Flash Flood Watch | LWX | 21 hr |
| Jul 21, 5:20 PM EDT | Areal Flood Warning | LWX | 23 hr |
| Jul 22, 5:35 AM EDT | Coastal Flood Advisory | LWX | 52 hr |
| Jul 22, 11:35 AM EDT | Flash Flood Watch | LWX | 17 hr |
| Jul 23, 2:57 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 23, 4:59 AM EDT | Flash Flood Watch | LWX | 68 hr |
| Jul 23, 2:40 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 25, 5:56 PM EDT | Areal Flood Warning | LWX | 11 hr |
| Jul 25, 6:16 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Jul 27, 4:06 AM EDT | Flash Flood Watch | LWX | 17 hr |
| Jul 27, 1:28 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 27, 1:52 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 27, 4:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 27, 7:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Aug 1, 4:10 AM EDT | Flash Flood Watch | LWX | 3 days |
| Aug 2, 11:46 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 2, 2:51 PM EDT | Areal Flood Warning | LWX | 5 hr |
| Aug 11, 10:50 AM EDT | Flash Flood Watch | LWX | 10 hr |
| Aug 13, 4:21 AM EDT | Flash Flood Watch | LWX | 18 hr |
| Aug 13, 4:11 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| Aug 17, 3:10 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 21, 1:16 PM EDT | Areal Flood Warning | LWX | 21 hr |
| Aug 21, 1:25 PM EDT | Coastal Flood Advisory | LWX | 21 hr |
| Aug 21, 7:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 28, 3:52 AM EDT | Heat Advisory | LWX | 16 hr |
| Aug 29, 3:49 AM EDT | Heat Advisory | LWX | 16 hr |
| Aug 31, 11:03 AM EDT | Flash Flood Watch | LWX | 13 hr |
| Aug 31, 9:51 PM EDT | Areal Flood Warning | LWX | 4 hr |
| Aug 31, 10:48 PM EDT | Areal Flood Warning | LWX | 6 hr |
| Sep 1, 9:52 PM EDT | Areal Flood Warning | LWX | 109 min |
| Sep 4, 2:17 AM EDT | Heat Advisory | LWX | 17 hr |
| Sep 7, 3:29 AM EDT | Flash Flood Watch | LWX | 19 hr |
| Sep 7, 5:10 PM EDT | Areal Flood Warning | LWX | 4 hr |
| Sep 7, 5:39 PM EDT | Areal Flood Warning | LWX | 10 hr |
| Sep 7, 6:00 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Sep 7, 8:48 PM EDT | Areal Flood Warning | LWX | 4 hr |
| Sep 8, 2:34 PM EDT | Coastal Flood Advisory | LWX | 6 days |
| Sep 8, 2:46 PM EDT | Flood Watch | LWX | 39 hr |
| Sep 9, 5:15 AM EDT | Coastal Flood Warning | LWX | 3 days |
| Sep 9, 12:32 PM EDT | Areal Flood Warning | LWX | 6 hr |
| Sep 9, 2:38 PM EDT | Coastal Flood Watch | LWX | 38 hr |
| Sep 11, 5:24 AM EDT | Dense Fog Advisory | LWX | 4 hr |
| Sep 12, 7:56 PM EDT | Coastal Flood Advisory | LWX | 5 days |
| Sep 13, 2:48 AM EDT | Coastal Flood Watch | LWX | 59 hr |
| Sep 13, 2:37 PM EDT | Coastal Flood Advisory | LWX | 61 hr |
| Sep 16, 3:31 AM EDT | Coastal Flood Advisory | LWX | 56 hr |
| Sep 16, 3:11 PM EDT | Flash Flood Watch | LWX | 52 hr |
| Sep 17, 3:42 PM EDT | Tornado Watch | SPC | 4 hr |
| Sep 17, 7:09 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 18, 2:26 AM EDT | Areal Flood Warning | LWX | 9 hr |
| Sep 20, 1:59 PM EDT | Coastal Flood Advisory | LWX | 45 hr |
| Sep 21, 2:26 AM EDT | Coastal Flood Advisory | LWX | 32 hr |
| Sep 23, 8:09 PM EDT | Coastal Flood Advisory | LWX | 3 days |
| Sep 24, 6:46 AM EDT | Coastal Flood Watch | LWX | 29 hr |
| Sep 24, 8:26 PM EDT | Coastal Flood Warning | LWX | 38 hr |
| Sep 25, 3:15 PM EDT | Coastal Flood Watch | LWX | 19 hr |
| Sep 25, 9:44 PM EDT | Coastal Flood Advisory | LWX | 50 hr |
| Sep 26, 3:40 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 26, 5:02 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 27, 2:39 AM EDT | Flood Watch | LWX | 27 hr |
| Sep 27, 8:07 AM EDT | Coastal Flood Advisory | LWX | 4 hr |
| Sep 28, 12:53 AM EDT | Coastal Flood Advisory | LWX | 37 hr |
| Sep 28, 1:09 AM EDT | Areal Flood Warning | LWX | 11 hr |
| Sep 29, 6:48 PM EDT | Coastal Flood Advisory | LWX | 19 hr |
| Oct 6, 8:53 AM EDT | Coastal Flood Advisory | LWX | 6 days |
| Oct 7, 12:57 PM EDT | Coastal Flood Advisory | LWX | 21 hr |
| Oct 9, 2:16 PM EDT | Coastal Flood Advisory | LWX | 8 hr |
| Oct 10, 2:13 AM EDT | Coastal Flood Advisory | LWX | 8 hr |
| Oct 10, 8:29 PM EDT | Coastal Flood Advisory | LWX | 4 hr |
| Oct 11, 3:12 AM EDT | Wind Advisory | LWX | 29 hr |
| Oct 13, 12:19 AM EDT | Coastal Flood Advisory | LWX | 25 hr |
| Oct 18, 2:57 PM EDT | Frost Advisory | LWX | 18 hr |
| Oct 21, 4:05 AM EDT | Frost Advisory | LWX | 30 hr |
| Oct 24, 2:43 PM EDT | Frost Advisory | LWX | 18 hr |
| Oct 26, 8:53 PM EDT | Coastal Flood Advisory | LWX | 16 hr |
| Oct 26, 10:29 PM EDT | Coastal Flood Advisory | LWX | 3 hr |
| Oct 27, 2:42 PM EDT | Coastal Flood Advisory | LWX | 10 hr |
| Oct 28, 6:00 AM EDT | Coastal Flood Advisory | LWX | 6 hr |
| Oct 28, 12:01 PM EDT | Coastal Flood Advisory | LWX | 90 min |
| Oct 28, 9:41 PM EDT | Coastal Flood Advisory | LWX | 3 hr |
| Oct 29, 1:25 AM EDT | Coastal Flood Advisory | LWX | 75 min |
| Nov 2, 6:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Nov 2, 10:05 PM EDT | Areal Flood Warning | LWX | 2 hr |
| Nov 5, 10:45 AM EST | Areal Flood Warning | LWX | 4 hr |
| Nov 6, 12:54 PM EST | Coastal Flood Advisory | LWX | 9 hr |
| Nov 9, 1:51 PM EST | Freeze Warning | LWX | 43 hr |
| Nov 14, 3:54 PM EST | Winter Weather Advisory | LWX | 36 hr |
| Nov 15, 12:28 AM EST | Flood Watch | LWX | 14 hr |
| Nov 15, 3:18 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Nov 24, 1:07 PM EST | Coastal Flood Advisory | LWX | 10 hr |
| Nov 24, 6:24 PM EST | Areal Flood Warning | LWX | 11 hr |
| Nov 26, 6:45 AM EST | Coastal Flood Advisory | LWX | 18 hr |
| Nov 27, 2:03 PM EST | Wind Advisory | LWX | 24 hr |
| Dec 1, 2:28 PM EST | Coastal Flood Advisory | LWX | 36 hr |
| Dec 13, 2:04 PM EST | Flood Watch | LWX | 63 hr |
| Dec 15, 4:34 PM EST | Areal Flood Warning | LWX | 25 hr |
| Dec 17, 12:55 PM EST | Coastal Flood Advisory | LWX | 6 hr |
| Dec 19, 3:48 AM EST | Flood Watch | LWX | 59 hr |
| Dec 20, 6:00 PM EST | Coastal Flood Advisory | LWX | 39 hr |
| Dec 21, 4:16 PM EST | Mesoscale Discussion | SPC | 59 min |
| Dec 27, 3:41 AM EST | Flood Watch | LWX | 39 hr |
| Dec 28, 7:45 PM EST | Dense Fog Advisory | LWX | 11 hr |
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 | 6 |
| Severe Thunderstorm Watch | 7 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 29 |
| Special Weather Statement | 2 |
| Flooding | |
| Areal Flood Warning | 23 |
| Flash Flood Warning | 4 |
| Flash Flood Watch | 16 |
| Flood Watch | 10 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 7 |
| Heat | |
| Excessive Heat Warning | 1 |
| Heat Advisory | 7 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
| Coast and beach | |
| Coastal Flood Warning | 3 |
| Coastal Flood Watch | 6 |
| Coastal Flood Advisory | 51 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.