Alert archive / Virginia / Fairfax County

Weather alerts in Fairfax County, Virginia, 2022

186 weather alerts in 2022, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Fairfax County and its neighbors

Each county as a circle sized by its count in 2022. Tap one for its archive.

Alerts: 186
Warnings: 73
Watches: 33
Advisories: 33
Busiest month: July44 alerts
Busiest day: June 2, 202213 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

1 of 4 tornado warnings covering Fairfax County in 2022 had a tornado report inside them; 1 of 2 tornado reports fell inside a warning, on average 20 minutes after it went out.

Fairfax County, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	4	1	75%	2	50%	20 min
Severe thunderstorm warnings	33	25	24%	44	84%	19 min
Flash flood warnings	13	6	54%	2	50%	103 min

Each office's whole area, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Baltimore/Washington: tornado warnings	38	6	84%	10	80%	9 min
NWS Baltimore/Washington: severe thunderstorm warnings	413	300	27%	1,177	78%	21 min
NWS Baltimore/Washington: flash flood warnings	77	34	56%	84	88%	90 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 2, 4:28 AM EST	Winter Storm Watch	LWX	8 hr
Jan 2, 4:28 AM EST	Winter Storm Warning	LWX	36 hr
Jan 2, 4:28 AM EST	Winter Weather Advisory	LWX	33 hr
Jan 3, 5:13 AM EST	Mesoscale Discussion	SPC	4 hr
Jan 3, 11:06 AM EST	Mesoscale Discussion	SPC	5 hr
Jan 5, 2:33 PM EST	Winter Weather Advisory	LWX	39 hr
Jan 7, 2:02 AM EST	Mesoscale Discussion	SPC	5 hr
Jan 8, 3:54 AM EST	Winter Weather Advisory	LWX	33 hr
Jan 14, 3:33 AM EST	Winter Storm Watch	LWX	33 hr
Jan 15, 12:30 PM EST	Winter Weather Advisory	LWX	34 hr
Jan 16, 3:24 PM EST	Mesoscale Discussion	SPC	5 hr
Jan 16, 8:33 PM EST	Wind Advisory	LWX	22 hr
Jan 19, 1:09 PM EST	Winter Weather Advisory	LWX	22 hr
Jan 27, 2:28 PM EST	Winter Weather Advisory	LWX	45 hr
Feb 2, 7:22 AM EST	Dense Fog Advisory	LWX	3 hr
Feb 4, 2:52 PM EST	Areal Flood Warning	LWX	3 hr
Feb 12, 10:00 AM EST	Winter Weather Advisory	LWX	27 hr
Feb 14, 8:11 AM EST	Special Weather Statement	LWX	64 min
Feb 17, 3:49 AM EST	Wind Advisory	LWX	30 hr
Feb 18, 2:18 PM EST	Wind Advisory	LWX	29 hr
Feb 24, 9:13 PM EST	Mesoscale Discussion	SPC	5 hr
Mar 6, 7:27 PM EST	Wind Advisory	LWX	30 hr
Mar 11, 3:57 AM EST	Winter Weather Advisory	LWX	35 hr
Mar 11, 3:26 PM EST	Wind Advisory	LWX	34 hr
Mar 17, 11:16 PM EDT	Dense Fog Advisory	LWX	4 min
Mar 17, 11:20 PM EDT	Dense Fog Advisory	LWX	11 hr
Mar 23, 11:04 PM EDT	Flood Watch	LWX	3 hr
Mar 25, 4:16 AM EDT	Dense Fog Advisory	LWX	3 hr
Mar 31, 1:41 PM EDT	Wind Advisory	LWX	6 hr
Mar 31, 2:01 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Mar 31, 7:13 PM EDT	Mesoscale Discussion	SPC	92 min
Mar 31, 8:18 PM EDT	Severe Thunderstorm Warning	LWX	42 min
Mar 31, 8:22 PM EDT	Tornado Warning	LWX	23 min
Mar 31, 8:46 PM EDT	Tornado Warning	LWX	10 min
Apr 9, 9:42 PM EDT	Frost Advisory	LWX	35 hr
May 4, 1:40 AM EDT	Areal Flood Warning	LWX	11 hr
May 6, 3:13 AM EDT	Flood Watch	LWX	33 hr
May 6, 3:34 PM EDT	River Flood Watch	LWX	29 hr
May 6, 11:48 PM EDT	Areal Flood Warning	LWX	16 hr
May 7, 9:21 PM EDT	River Flood Warning	LWX	39 hr
May 14, 10:45 PM EDT	Dense Fog Advisory	LWX	10 hr
May 15, 3:05 PM EDT	Mesoscale Discussion	SPC	85 min
May 15, 7:28 PM EDT	Areal Flood Warning	LWX	2 hr
May 16, 12:01 PM EDT	Mesoscale Discussion	SPC	119 min
May 16, 2:23 PM EDT	Mesoscale Discussion	SPC	2 hr
May 16, 3:40 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
May 16, 3:49 PM EDT	Severe Thunderstorm Warning	LWX	41 min
May 16, 4:07 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	38 min
May 22, 12:20 PM EDT	Mesoscale Discussion	SPC	2 hr
May 22, 1:53 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
May 22, 3:58 PM EDT	Severe Thunderstorm Warning	LWX	30 min
May 22, 4:15 PM EDT	Mesoscale Discussion	SPC	90 min
May 22, 5:09 PM EDT	Severe Thunderstorm Warning	LWX	51 min
May 22, 5:56 PM EDT	Severe Thunderstorm Warning	LWX	49 min
May 22, 6:32 PM EDT	Mesoscale Discussion	SPC	118 min
May 22, 7:04 PM EDT	Severe Thunderstorm Warning	LWX	56 min
May 22, 7:18 PM EDT	Areal Flood Warning	LWX	5 hr
May 27, 4:07 AM EDT	Flood Watch	LWX	19 hr
May 27, 6:24 AM EDT	Tornado Watch	SPC	8 hr
May 27, 8:13 AM EDT	Mesoscale Discussion	SPC	2 hr
May 27, 10:59 AM EDT	Mesoscale Discussion	SPC	91 min
May 27, 11:43 AM EDT	Severe Thunderstorm Warning	LWX	47 min
May 27, 11:47 AM EDT	Severe Thunderstorm Warning	LWX	43 min
May 27, 11:54 AM EDT	Tornado Warning	LWX	6 min
May 27, 5:45 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
May 27, 7:22 PM EDT	Mesoscale Discussion	SPC	83 min
Jun 2, 1:04 PM EDT	Mesoscale Discussion	SPC	116 min
Jun 2, 1:53 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 2, 3:07 PM EDT	Flood Watch	LWX	4 hr
Jun 2, 3:22 PM EDT	Severe Thunderstorm Warning	LWX	38 min
Jun 2, 3:52 PM EDT	Severe Thunderstorm Warning	LWX	38 min
Jun 2, 3:55 PM EDT	Flash Flood Warning Considerable damage threat	LWX	61 min
Jun 2, 4:10 PM EDT	Flash Flood Warning Considerable damage threat	LWX	46 min
Jun 2, 4:17 PM EDT	Areal Flood Warning	LWX	4 hr
Jun 2, 4:18 PM EDT	Severe Thunderstorm Warning	LWX	42 min
Jun 2, 4:41 PM EDT	Areal Flood Warning	LWX	5 min
Jun 2, 4:43 PM EDT	Mesoscale Discussion	SPC	92 min
Jun 2, 4:46 PM EDT	Flash Flood Warning Considerable damage threat	LWX	100 min
Jun 2, 6:26 PM EDT	Areal Flood Warning	LWX	2 hr
Jun 8, 12:05 PM EDT	Flood Watch	LWX	15 hr
Jun 8, 2:58 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 8, 5:52 PM EDT	Severe Thunderstorm Warning	LWX	38 min
Jun 8, 11:17 PM EDT	Mesoscale Discussion	SPC	118 min
Jun 9, 1:39 AM EDT	Mesoscale Discussion	SPC	3 hr
Jun 13, 6:57 PM EDT	Severe Thunderstorm Warning	LWX	48 min
Jun 13, 8:27 PM EDT	Severe Thunderstorm Warning	LWX	48 min
Jun 13, 9:02 PM EDT	Severe Thunderstorm Warning	LWX	43 min
Jun 16, 3:29 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 16, 4:32 PM EDT	Severe Thunderstorm Warning	LWX	20 min
Jun 16, 4:53 PM EDT	Mesoscale Discussion	SPC	97 min
Jun 16, 5:24 PM EDT	Severe Thunderstorm Warning	LWX	28 min
Jun 22, 3:05 AM EDT	Flood Watch	LWX	20 hr
Jun 22, 12:57 PM EDT	Mesoscale Discussion	SPC	93 min
Jun 22, 1:34 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 22, 3:56 PM EDT	Mesoscale Discussion	SPC	94 min
Jun 22, 6:16 PM EDT	Mesoscale Discussion	SPC	119 min
Jun 22, 8:48 PM EDT	Areal Flood Warning	LWX	61 min
Jun 23, 1:38 AM EDT	Areal Flood Warning	LWX	3 hr
Jul 1, 11:59 AM EDT	Mesoscale Discussion	SPC	3 hr
Jul 1, 3:12 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Jul 1, 3:38 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 2, 2:48 AM EDT	Flood Watch	LWX	19 hr
Jul 2, 1:16 PM EDT	Mesoscale Discussion	SPC	119 min
Jul 2, 3:02 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 2, 4:47 PM EDT	Mesoscale Discussion	SPC	118 min
Jul 2, 9:01 PM EDT	Flash Flood Warning	LWX	6 hr
Jul 3, 2:46 AM EDT	Areal Flood Warning	LWX	6 hr
Jul 6, 5:20 AM EDT	Flood Watch	LWX	24 hr
Jul 8, 12:53 PM EDT	Flood Watch	LWX	23 hr
Jul 8, 11:55 PM EDT	Flash Flood Warning Considerable damage threat	LWX	3 hr
Jul 9, 1:24 AM EDT	Flash Flood Warning	LWX	100 min
Jul 9, 1:42 AM EDT	Flash Flood Warning Considerable damage threat	LWX	2 hr
Jul 9, 2:35 AM EDT	Areal Flood Warning	LWX	7 hr
Jul 9, 3:04 AM EDT	Areal Flood Warning	LWX	11 hr
Jul 9, 3:17 AM EDT	Areal Flood Warning	LWX	7 hr
Jul 9, 3:58 AM EDT	Areal Flood Warning	LWX	10 hr
Jul 12, 6:34 AM EDT	Flood Watch	LWX	18 hr
Jul 12, 12:48 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 12, 2:12 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 12, 4:02 PM EDT	Mesoscale Discussion	SPC	88 min
Jul 12, 5:04 PM EDT	Severe Thunderstorm Warning	LWX	41 min
Jul 12, 5:38 PM EDT	Severe Thunderstorm Warning	LWX	37 min
Jul 12, 7:40 PM EDT	Severe Thunderstorm Warning	LWX	50 min
Jul 14, 4:19 PM EDT	Severe Thunderstorm Warning	LWX	41 min
Jul 16, 1:36 PM EDT	Mesoscale Discussion	SPC	3 hr
Jul 16, 6:40 PM EDT	Flash Flood Warning	LWX	3 hr
Jul 16, 6:49 PM EDT	Areal Flood Warning	LWX	4 hr
Jul 16, 7:38 PM EDT	Flash Flood Warning	LWX	3 hr
Jul 17, 2:21 PM EDT	Mesoscale Discussion	SPC	114 min
Jul 18, 9:31 AM EDT	Flood Watch	LWX	12 hr
Jul 18, 12:18 PM EDT	Mesoscale Discussion	SPC	117 min
Jul 18, 1:47 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 18, 3:44 PM EDT	Severe Thunderstorm Warning	LWX	34 min
Jul 18, 4:32 PM EDT	Mesoscale Discussion	SPC	88 min
Jul 20, 12:51 PM EDT	Heat Advisory	LWX	29 hr
Jul 21, 4:04 PM EDT	Severe Thunderstorm Warning	LWX	26 min
Jul 23, 1:13 PM EDT	Heat Advisory	LWX	31 hr
Jul 23, 7:04 PM EDT	Mesoscale Discussion	SPC	116 min
Jul 25, 1:02 PM EDT	Mesoscale Discussion	SPC	118 min
Jul 25, 1:46 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 25, 3:42 PM EDT	Severe Thunderstorm Warning	LWX	48 min
Jul 25, 4:01 PM EDT	Mesoscale Discussion	SPC	119 min
Aug 1, 10:37 PM EDT	Severe Thunderstorm Warning	LWX	38 min
Aug 3, 1:02 PM EDT	Heat Advisory	LWX	31 hr
Aug 4, 1:14 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 4, 6:28 PM EDT	Severe Thunderstorm Warning	LWX	47 min
Aug 4, 7:24 PM EDT	Severe Thunderstorm Warning	LWX	36 min
Aug 4, 8:44 PM EDT	Severe Thunderstorm Warning	LWX	30 min
Aug 5, 10:20 AM EDT	Flood Watch	LWX	11 hr
Aug 5, 2:37 PM EDT	Mesoscale Discussion	SPC	113 min
Aug 5, 5:42 PM EDT	Areal Flood Warning	LWX	4 hr
Aug 10, 3:07 AM EDT	Flood Watch	LWX	20 hr
Aug 10, 1:01 PM EDT	Mesoscale Discussion	SPC	3 hr
Aug 10, 4:12 PM EDT	Severe Thunderstorm Warning	LWX	48 min
Aug 10, 4:25 PM EDT	Severe Thunderstorm Warning	LWX	14 min
Aug 10, 4:27 PM EDT	Flash Flood Warning	LWX	3 hr
Aug 10, 4:28 PM EDT	Severe Thunderstorm Warning	LWX	30 min
Aug 10, 4:48 PM EDT	Flash Flood Warning	LWX	3 hr
Aug 10, 4:57 PM EDT	Flash Flood Warning	LWX	2 hr
Aug 10, 5:12 PM EDT	Flash Flood Warning	LWX	2 hr
Aug 10, 7:17 PM EDT	Areal Flood Warning	LWX	8 hr
Aug 22, 4:10 PM EDT	Mesoscale Discussion	SPC	3 hr
Aug 30, 1:55 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 30, 4:06 PM EDT	Severe Thunderstorm Warning	LWX	39 min
Sep 5, 9:06 PM EDT	Flood Watch	LWX	12 hr
Sep 12, 2:52 AM EDT	Flood Watch	LWX	17 hr
Sep 12, 2:22 PM EDT	Mesoscale Discussion	SPC	2 hr
Sep 12, 4:52 PM EDT	Tornado Warning	LWX	23 min
Sep 12, 5:41 PM EDT	Areal Flood Warning	LWX	3 hr
Sep 12, 5:46 PM EDT	Mesoscale Discussion	SPC	119 min
Sep 25, 10:23 AM EDT	Mesoscale Discussion	SPC	2 hr
Sep 25, 11:37 AM EDT	Severe Thunderstorm Watch	SPC	6 hr
Sep 25, 2:35 PM EDT	Mesoscale Discussion	SPC	115 min
Oct 18, 12:36 PM EDT	Frost Advisory	LWX	20 hr
Oct 19, 1:32 PM EDT	Freeze Warning	LWX	19 hr
Oct 20, 1:59 PM EDT	Frost Advisory	LWX	19 hr
Oct 29, 1:00 PM EDT	Frost Advisory	LWX	21 hr
Nov 1, 4:03 AM EDT	Dense Fog Advisory	LWX	7 hr
Dec 7, 10:40 PM EST	Dense Fog Advisory	LWX	8 hr
Dec 14, 2:30 AM EST	Winter Weather Advisory	LWX	37 hr
Dec 21, 3:51 AM EST	Winter Weather Advisory	LWX	36 hr
Dec 21, 3:22 PM EST	Flood Watch	LWX	34 hr
Dec 22, 12:37 PM EST	Wind Advisory	LWX	29 hr
Dec 22, 2:55 PM EST	Wind Chill Advisory	LWX	67 hr
Dec 22, 8:35 PM EST	Areal Flood Warning	LWX	15 hr
Dec 31, 5:56 AM EST	Dense Fog Advisory	LWX	16 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	33
Tornado Warning	4
Severe Thunderstorm Watch	13
Tornado Watch	1
Mesoscale Discussion	46
Special Weather Statement	1
Flooding
Areal Flood Warning	20
Flash Flood Warning	13
River Flood Warning	1
Flood Watch	16
River Flood Watch	1
Winter
Winter Storm Warning	1
Winter Storm Watch	2
Winter Weather Advisory	10
Heat
Heat Advisory	3
Cold
Freeze Warning	1
Frost Advisory	4
Wind Chill Advisory	1
Wind and dust
Wind Advisory	7
Fog and smoke
Dense Fog Advisory	8

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2021 2023

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.