Alert archive / Virginia / Montgomery County

Weather alerts in Montgomery County, Virginia, 2019

175 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Montgomery County and its neighbors

Each county as a circle sized by its count in 2019. Tap one for its archive.

Alerts: 175
Warnings: 38
Watches: 18
Advisories: 47
Busiest month: May25 alerts
Busiest day: October 31, 20197 alerts

Over time

By month

Warning verification

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

Montgomery County, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	28	23	18%	13	46%	18 min
Flash flood warnings	2	1	50%	0

Each office's whole area, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Blacksburg, VA: tornado warnings	45	1	98%	4	50%	32 min
NWS Blacksburg, VA: severe thunderstorm warnings	299	219	27%	791	68%	25 min
NWS Blacksburg, VA: flash flood warnings	35	14	60%	52	48%	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 4, 3:17 PM EST	Wind Advisory	RNK	24 hr
Jan 8, 3:57 AM EST	Wind Advisory	RNK	51 hr
Jan 11, 4:06 AM EST	Winter Storm Watch	RNK	12 hr
Jan 11, 3:44 PM EST	Winter Storm Warning	RNK	51 hr
Jan 13, 7:16 PM EST	Winter Weather Advisory	RNK	15 hr
Jan 17, 4:49 AM EST	Winter Weather Advisory	RNK	24 hr
Jan 19, 3:52 PM EST	Winter Weather Advisory	RNK	40 hr
Jan 20, 12:16 PM EST	Wind Chill Advisory	RNK	24 hr
Jan 23, 5:22 AM EST	Flood Watch	RNK	29 hr
Jan 28, 4:21 AM EST	Winter Weather Advisory	RNK	35 hr
Jan 29, 3:20 PM EST	Wind Chill Advisory	RNK	45 hr
Jan 29, 10:25 PM EST	Wind Advisory	RNK	21 hr
Feb 8, 3:22 AM EST	Wind Advisory	RNK	17 hr
Feb 10, 4:43 AM EST	Winter Weather Advisory	RNK	27 hr
Feb 12, 3:32 AM EST	Wind Advisory	RNK	37 hr
Feb 12, 5:09 PM EST	Special Weather Statement	RNK	81 min
Feb 12, 6:44 PM EST	Special Weather Statement	RNK	2 hr
Feb 16, 4:10 PM EST	Winter Weather Advisory	RNK	27 hr
Feb 18, 3:28 AM EST	Winter Storm Watch	RNK	12 hr
Feb 18, 3:33 PM EST	Winter Storm Warning	RNK	56 hr
Feb 20, 12:26 AM EST	Mesoscale Discussion	SPC	4 hr
Feb 20, 7:06 PM EST	Winter Weather Advisory	RNK	5 hr
Feb 21, 2:44 PM EST	Flood Watch	RNK	67 hr
Feb 22, 4:18 PM EST	Areal Flood Advisory	RNK	4 hr
Feb 23, 1:56 AM EST	High Wind Watch	RNK	14 hr
Feb 23, 9:12 AM EST	River Flood Warning	RNK	31 hr
Feb 23, 9:32 AM EST	Areal Flood Advisory	RNK	9 hr
Feb 23, 4:08 PM EST	High Wind Warning	RNK	44 hr
Feb 23, 7:38 PM EST	Areal Flood Advisory	RNK	4 hr
Feb 24, 12:05 AM EST	Areal Flood Warning	RNK	9 hr
Mar 1, 4:24 PM EST	Special Weather Statement	RNK	51 min
Mar 1, 7:43 PM EST	Special Weather Statement	RNK	62 min
Mar 5, 3:24 AM EST	Wind Chill Advisory	RNK	31 hr
Mar 7, 3:05 PM EST	Winter Weather Advisory	RNK	24 hr
Mar 15, 2:49 PM EDT	Wind Advisory	RNK	20 hr
Mar 19, 10:00 AM EDT	Special Weather Statement	RNK	15 min
Mar 22, 3:30 AM EDT	Wind Advisory	RNK	24 hr
Apr 8, 1:49 PM EDT	Mesoscale Discussion	SPC	86 min
Apr 8, 2:32 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 8, 2:46 PM EDT	Severe Thunderstorm Warning	RNK	44 min
Apr 8, 3:14 PM EDT	Areal Flood Advisory	RNK	2 hr
Apr 8, 3:21 PM EDT	Severe Thunderstorm Warning	RNK	39 min
Apr 8, 3:42 PM EDT	Severe Thunderstorm Warning	RNK	3 min
Apr 12, 11:47 PM EDT	Special Weather Statement	RNK	43 min
Apr 13, 12:29 AM EDT	Special Weather Statement	RNK	46 min
Apr 14, 6:30 PM EDT	Mesoscale Discussion	SPC	90 min
Apr 14, 7:12 PM EDT	Mesoscale Discussion	SPC	2 hr
Apr 14, 7:21 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Apr 14, 8:31 PM EDT	Mesoscale Discussion	SPC	59 min
Apr 14, 10:07 PM EDT	Special Weather Statement	RNK	83 min
Apr 14, 10:09 PM EDT	Mesoscale Discussion	SPC	96 min
Apr 14, 10:27 PM EDT	Severe Thunderstorm Warning	RNK	78 min
Apr 14, 11:09 PM EDT	Severe Thunderstorm Warning	RNK	66 min
Apr 15, 2:58 AM EDT	Wind Advisory	RNK	15 hr
Apr 19, 10:31 AM EDT	Tornado Watch	SPC	9 hr
Apr 19, 11:14 AM EDT	Special Weather Statement	RNK	31 min
Apr 19, 1:40 PM EDT	Mesoscale Discussion	SPC	2 hr
Apr 19, 3:46 PM EDT	Areal Flood Advisory	RNK	6 hr
Apr 19, 5:36 PM EDT	Severe Thunderstorm Warning	RNK	54 min
Apr 19, 11:47 PM EDT	River Flood Warning	RNK	32 hr
Apr 25, 3:31 PM EDT	Wind Advisory	RNK	42 hr
May 2, 1:59 PM EDT	Special Weather Statement	RNK	31 min
May 3, 12:58 PM EDT	Mesoscale Discussion	SPC	2 hr
May 3, 4:59 PM EDT	Severe Thunderstorm Warning	RNK	46 min
May 3, 9:58 PM EDT	Special Weather Statement	RNK	62 min
May 3, 10:23 PM EDT	Special Weather Statement	RNK	37 min
May 3, 11:00 PM EDT	Special Weather Statement	RNK	45 min
May 12, 3:37 PM EDT	Mesoscale Discussion	SPC	113 min
May 17, 7:49 AM EDT	Special Weather Statement	RNK	56 min
May 17, 7:37 PM EDT	Mesoscale Discussion	SPC	113 min
May 17, 9:39 PM EDT	Mesoscale Discussion	SPC	66 min
May 25, 8:57 PM EDT	Special Weather Statement	RNK	48 min
May 25, 9:43 PM EDT	Special Weather Statement	RNK	62 min
May 26, 9:40 PM EDT	Severe Thunderstorm Warning	RNK	35 min
May 26, 10:13 PM EDT	Severe Thunderstorm Warning	RNK	32 min
May 29, 3:41 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
May 29, 4:08 PM EDT	Special Weather Statement	RNK	37 min
May 29, 4:31 PM EDT	Severe Thunderstorm Warning	RNK	44 min
May 29, 4:52 PM EDT	Special Weather Statement	RNK	38 min
May 29, 4:55 PM EDT	Severe Thunderstorm Warning	RNK	65 min
May 29, 5:35 PM EDT	Severe Thunderstorm Warning	RNK	25 min
May 31, 12:07 PM EDT	Mesoscale Discussion	SPC	113 min
May 31, 1:29 PM EDT	Severe Thunderstorm Watch	SPC	10 hr
May 31, 3:45 PM EDT	Severe Thunderstorm Warning	RNK	60 min
May 31, 6:07 PM EDT	Special Weather Statement	RNK	38 min
May 31, 7:22 PM EDT	Mesoscale Discussion	SPC	83 min
May 31, 9:55 PM EDT	Mesoscale Discussion	SPC	95 min
Jun 2, 12:24 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 2, 6:42 PM EDT	Special Weather Statement	RNK	48 min
Jun 6, 5:14 PM EDT	Areal Flood Advisory	RNK	2 hr
Jun 7, 8:21 PM EDT	Flash Flood Watch	RNK	48 hr
Jun 8, 7:48 AM EDT	Areal Flood Advisory	RNK	4 hr
Jun 8, 9:09 AM EDT	Flash Flood Warning	RNK	6 hr
Jun 8, 2:54 PM EDT	Areal Flood Warning	RNK	6 hr
Jun 10, 3:47 AM EDT	Flash Flood Watch	RNK	17 hr
Jun 10, 5:47 PM EDT	Special Weather Statement	RNK	58 min
Jun 16, 4:16 PM EDT	Special Weather Statement	RNK	59 min
Jun 16, 4:51 PM EDT	Special Weather Statement	RNK	39 min
Jun 17, 1:32 PM EDT	Special Weather Statement	RNK	43 min
Jun 18, 4:54 AM EDT	Flash Flood Watch	RNK	18 hr
Jun 18, 3:19 PM EDT	Mesoscale Discussion	SPC	116 min
Jun 24, 5:44 PM EDT	Mesoscale Discussion	SPC	3 hr
Jun 24, 6:28 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 24, 8:55 PM EDT	Special Weather Statement	RNK	50 min
Jul 4, 4:31 PM EDT	Special Weather Statement	RNK	14 min
Jul 4, 4:46 PM EDT	Special Weather Statement	RNK	14 min
Jul 5, 4:29 PM EDT	Special Weather Statement	RNK	31 min
Jul 6, 11:00 PM EDT	Special Weather Statement	RNK	30 min
Jul 6, 11:30 PM EDT	Special Weather Statement	RNK	15 min
Jul 11, 12:15 PM EDT	Flash Flood Watch	RNK	6 hr
Jul 15, 6:33 PM EDT	Special Weather Statement	RNK	27 min
Jul 15, 7:12 PM EDT	Areal Flood Advisory	RNK	84 min
Jul 21, 1:06 PM EDT	Special Weather Statement	RNK	39 min
Jul 21, 1:16 PM EDT	Severe Thunderstorm Warning	RNK	24 min
Jul 21, 1:47 PM EDT	Areal Flood Advisory	RNK	3 hr
Jul 21, 1:47 PM EDT	Severe Thunderstorm Warning	RNK	43 min
Jul 22, 3:41 AM EDT	Flash Flood Watch	RNK	32 hr
Jul 22, 3:10 PM EDT	Special Weather Statement	RNK	65 min
Jul 22, 3:28 PM EDT	Severe Thunderstorm Warning	RNK	62 min
Jul 22, 3:49 PM EDT	Severe Thunderstorm Warning	RNK	56 min
Aug 1, 3:17 PM EDT	Severe Thunderstorm Warning	RNK	58 min
Aug 1, 4:18 PM EDT	Severe Thunderstorm Warning	RNK	57 min
Aug 1, 4:28 PM EDT	Severe Thunderstorm Warning	RNK	62 min
Aug 3, 5:45 AM EDT	Dense Fog Advisory	RNK	4 hr
Aug 4, 6:17 AM EDT	Dense Fog Advisory	RNK	3 hr
Aug 6, 4:45 AM EDT	Dense Fog Advisory	RNK	4 hr
Aug 7, 10:17 PM EDT	Special Weather Statement	RNK	58 min
Aug 9, 2:25 PM EDT	Mesoscale Discussion	SPC	95 min
Aug 10, 1:59 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 13, 12:00 PM EDT	Mesoscale Discussion	SPC	105 min
Aug 18, 4:45 PM EDT	Special Weather Statement	RNK	30 min
Aug 18, 5:13 PM EDT	Special Weather Statement	RNK	32 min
Aug 18, 5:44 PM EDT	Special Weather Statement	RNK	46 min
Aug 18, 5:55 PM EDT	Areal Flood Advisory	RNK	62 min
Aug 20, 1:27 PM EDT	Special Weather Statement	RNK	33 min
Aug 20, 1:48 PM EDT	Special Weather Statement	RNK	57 min
Aug 20, 2:01 PM EDT	Severe Thunderstorm Warning	RNK	41 min
Aug 20, 5:56 PM EDT	Special Weather Statement	RNK	34 min
Aug 20, 6:29 PM EDT	Special Weather Statement	RNK	31 min
Aug 22, 1:12 PM EDT	Severe Thunderstorm Warning	RNK	48 min
Aug 22, 1:48 PM EDT	Severe Thunderstorm Warning	RNK	57 min
Aug 22, 2:02 PM EDT	Mesoscale Discussion	SPC	118 min
Aug 22, 3:50 PM EDT	Special Weather Statement	RNK	55 min
Aug 23, 3:30 AM EDT	Special Weather Statement	RNK	60 min
Sep 6, 9:53 PM EDT	Special Weather Statement	RNK	22 min
Sep 14, 5:37 PM EDT	Severe Thunderstorm Warning	RNK	53 min
Sep 28, 1:21 PM EDT	Special Weather Statement	RNK	24 min
Sep 28, 1:25 PM EDT	Severe Thunderstorm Warning	RNK	32 min
Sep 28, 1:51 PM EDT	Severe Thunderstorm Warning	RNK	39 min
Sep 30, 5:04 PM EDT	Special Weather Statement	RNK	41 min
Sep 30, 5:55 PM EDT	Special Weather Statement	RNK	35 min
Oct 15, 3:38 PM EDT	Wind Advisory	RNK	43 hr
Oct 17, 2:33 PM EDT	Frost Advisory	RNK	18 hr
Oct 18, 2:54 AM EDT	Frost Advisory	RNK	30 hr
Oct 23, 4:38 AM EDT	Frost Advisory	RNK	28 hr
Oct 27, 6:36 AM EDT	Special Weather Statement	RNK	69 min
Oct 31, 4:48 AM EDT	Wind Advisory	RNK	28 hr
Oct 31, 11:12 AM EDT	Mesoscale Discussion	SPC	2 hr
Oct 31, 1:11 PM EDT	Mesoscale Discussion	SPC	3 hr
Oct 31, 3:16 PM EDT	Tornado Watch	SPC	8 hr
Oct 31, 3:50 PM EDT	Severe Thunderstorm Warning	RNK	40 min
Oct 31, 4:30 PM EDT	Severe Thunderstorm Warning	RNK	60 min
Oct 31, 5:38 PM EDT	Flash Flood Warning	RNK	112 min
Nov 18, 9:12 PM EST	Dense Fog Advisory	RNK	12 hr
Nov 23, 4:22 AM EST	Wind Advisory	RNK	32 hr
Nov 26, 2:44 PM EST	High Wind Watch	RNK	14 hr
Nov 26, 2:44 PM EST	Wind Advisory	RNK	44 hr
Nov 27, 4:38 AM EST	High Wind Warning	RNK	30 hr
Dec 1, 3:50 AM EST	Wind Advisory	RNK	51 hr
Dec 3, 2:46 PM EST	Wind Advisory	RNK	39 hr
Dec 10, 1:59 PM EST	Winter Weather Advisory	RNK	13 hr
Dec 12, 4:30 AM EST	Winter Weather Advisory	RNK	33 hr
Dec 24, 1:38 AM EST	Freezing Fog Advisory	RNK	7 hr
Dec 24, 4:13 AM EST	Dense Fog Advisory	RNK	5 hr
Dec 30, 5:29 AM EST	Special Weather Statement	RNK	31 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	28
Severe Thunderstorm Watch	5
Tornado Watch	2
Mesoscale Discussion	23
Special Weather Statement	49
Flooding
Areal Flood Warning	2
Flash Flood Warning	2
River Flood Warning	2
Flash Flood Watch	5
Flood Watch	2
Areal Flood Advisory	10
Winter
Winter Storm Warning	2
Winter Storm Watch	2
Winter Weather Advisory	10
Cold
Frost Advisory	3
Wind Chill Advisory	3
Wind and dust
High Wind Warning	2
High Wind Watch	2
Wind Advisory	15
Fog and smoke
Dense Fog Advisory	5
Freezing Fog Advisory	1

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2018 2020

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.