Alert archive / Virginia / Grayson County

Weather alerts in Grayson County, Virginia, 2012

184 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Grayson County and its neighbors

Each county as a circle sized by its count in 2012. Tap one for its archive.

Alerts: 184
Warnings: 44
Watches: 31
Advisories: 32
Busiest month: July41 alerts
Busiest day: March 24, 201212 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 2 tornado warnings covering Grayson County in 2012 had a tornado report inside them.

Grayson County, 2012

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	0	100%	0
Severe thunderstorm warnings	24	19	21%	17	88%	37 min
Flash flood warnings	2	2	0%	0

Each office's whole area, 2012

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Blacksburg, VA: tornado warnings	17	0	100%	0
NWS Blacksburg, VA: severe thunderstorm warnings	359	271	25%	793	83%	23 min
NWS Blacksburg, VA: flash flood warnings	50	27	46%	60	77%	56 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, 10:42 AM EST	Wind Advisory	RNK	19 hr
Jan 1, 3:37 PM EST	Winter Weather Advisory	RNK	50 hr
Jan 10, 2:54 PM EST	Flood Watch	RNK	30 hr
Jan 11, 11:12 AM EST	Wind Advisory	RNK	7 hr
Jan 12, 4:13 AM EST	Winter Weather Advisory	RNK	34 hr
Jan 12, 4:14 AM EST	High Wind Warning	RNK	34 hr
Jan 14, 2:19 PM EST	Winter Weather Advisory	RNK	17 hr
Jan 17, 6:39 PM EST	Special Weather Statement	RNK	51 min
Jan 22, 4:29 AM EST	Freezing Rain Advisory	RNK	7 hr
Jan 23, 8:57 AM EST	Wind Advisory	RNK	9 hr
Jan 27, 2:40 AM EST	Special Weather Statement	RNK	110 min
Jan 27, 4:40 AM EST	Special Weather Statement	RNK	110 min
Feb 10, 9:47 AM EST	Winter Weather Advisory	RNK	44 hr
Feb 10, 3:02 PM EST	High Wind Watch	RNK	13 hr
Feb 11, 4:15 AM EST	High Wind Warning	RNK	24 hr
Feb 11, 3:51 PM EST	Wind Chill Advisory	RNK	18 hr
Feb 17, 3:11 PM EST	Winter Storm Watch	RNK	25 hr
Feb 18, 4:36 PM EST	Winter Storm Warning	RNK	34 hr
Feb 19, 12:47 PM EST	Mesoscale Discussion	SPC	4 hr
Feb 23, 2:26 PM EST	Wind Advisory	RNK	34 hr
Feb 24, 9:05 AM EST	Mesoscale Discussion	SPC	25 min
Feb 24, 12:00 PM EST	Mesoscale Discussion	SPC	60 min
Feb 24, 3:24 PM EST	Mesoscale Discussion	SPC	66 min
Feb 25, 12:00 AM EST	Wind Advisory	RNK	18 hr
Feb 25, 7:26 AM EST	High Wind Warning	RNK	11 hr
Feb 29, 3:23 PM EST	Mesoscale Discussion	SPC	67 min
Feb 29, 3:43 PM EST	Tornado Watch	SPC	5 hr
Feb 29, 7:23 PM EST	Tornado Warning	RNK	37 min
Mar 1, 12:20 AM EST	Mesoscale Discussion	SPC	85 min
Mar 2, 10:31 PM EST	Tornado Warning	RNK	29 min
Mar 2, 11:08 PM EST	Special Weather Statement	RNK	52 min
Mar 4, 2:22 PM EST	Winter Weather Advisory	RNK	22 hr
Mar 5, 4:12 AM EST	Wind Advisory	RNK	12 hr
Mar 15, 2:56 PM EDT	Severe Thunderstorm Warning	RNK	49 min
Mar 15, 4:41 PM EDT	Special Weather Statement	RNK	64 min
Mar 15, 5:12 PM EDT	Special Weather Statement	RNK	63 min
Mar 16, 6:08 PM EDT	Special Weather Statement	RNK	37 min
Mar 17, 2:16 PM EDT	Special Weather Statement	RNK	29 min
Mar 20, 3:04 PM EDT	Mesoscale Discussion	SPC	116 min
Mar 21, 1:22 PM EDT	Mesoscale Discussion	SPC	113 min
Mar 23, 1:19 PM EDT	Special Weather Statement	RNK	56 min
Mar 24, 12:03 PM EDT	Mesoscale Discussion	SPC	117 min
Mar 24, 12:32 PM EDT	Special Weather Statement	RNK	43 min
Mar 24, 12:46 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Mar 24, 1:25 PM EDT	Special Weather Statement	RNK	50 min
Mar 24, 1:30 PM EDT	Severe Thunderstorm Warning	RNK	60 min
Mar 24, 2:22 PM EDT	Severe Thunderstorm Warning	RNK	53 min
Mar 24, 2:31 PM EDT	Mesoscale Discussion	SPC	59 min
Mar 24, 2:34 PM EDT	Severe Thunderstorm Warning	RNK	56 min
Mar 24, 2:34 PM EDT	Severe Thunderstorm Warning	RNK	56 min
Mar 24, 3:26 PM EDT	Severe Thunderstorm Warning	RNK	64 min
Mar 24, 6:16 PM EDT	Special Weather Statement	RNK	29 min
Mar 24, 6:58 PM EDT	Mesoscale Discussion	SPC	92 min
Mar 25, 6:50 AM EDT	Flash Flood Watch	RNK	14 hr
Mar 26, 4:42 AM EDT	Frost Advisory	RNK	28 hr
Apr 3, 3:49 PM EDT	Special Weather Statement	RNK	56 min
Apr 3, 5:04 PM EDT	Special Weather Statement	RNK	56 min
Apr 4, 1:31 PM EDT	Mesoscale Discussion	SPC	89 min
Apr 5, 3:21 PM EDT	Freeze Watch	RNK	12 hr
Apr 6, 3:37 AM EDT	Freeze Warning	RNK	30 hr
Apr 8, 7:09 PM EDT	Fire Weather Watch	RNK	16 hr
Apr 8, 7:09 PM EDT	Red Flag Warning	RNK	25 hr
Apr 9, 10:51 AM EDT	Fire Weather Watch	RNK	16 hr
Apr 9, 3:35 PM EDT	Freeze Watch	RNK	11 hr
Apr 9, 8:51 PM EDT	Red Flag Warning	RNK	23 hr
Apr 10, 3:03 AM EDT	Freeze Warning	RNK	30 hr
Apr 10, 3:52 PM EDT	Freeze Watch	RNK	23 hr
Apr 11, 3:13 PM EDT	Freeze Warning	RNK	18 hr
Apr 11, 3:25 PM EDT	Freeze Watch	RNK	24 hr
Apr 12, 3:23 PM EDT	Freeze Warning	RNK	18 hr
Apr 17, 3:19 PM EDT	Special Weather Statement	RNK	26 min
Apr 17, 4:16 PM EDT	Areal Flood Advisory	RNK	16 days
Apr 21, 4:12 PM EDT	Special Weather Statement	RNK	33 min
Apr 22, 3:49 PM EDT	Wind Advisory	RNK	28 hr
Apr 23, 5:29 AM EDT	Freeze Warning	RNK	26 hr
Apr 26, 12:39 AM EDT	Special Weather Statement	RNK	36 min
Apr 26, 7:24 AM EDT	Mesoscale Discussion	SPC	96 min
Apr 26, 8:45 AM EDT	Severe Thunderstorm Warning	RNK	60 min
Apr 26, 8:47 AM EDT	Mesoscale Discussion	SPC	88 min
Apr 26, 8:57 AM EDT	Severe Thunderstorm Warning	RNK	63 min
Apr 26, 9:18 AM EDT	Special Weather Statement	RNK	27 min
Apr 30, 3:50 PM EDT	Special Weather Statement	RNK	25 min
Apr 30, 4:10 PM EDT	Severe Thunderstorm Warning	RNK	48 min
Apr 30, 5:19 PM EDT	Special Weather Statement	RNK	56 min
Apr 30, 6:18 PM EDT	Special Weather Statement	RNK	57 min
Apr 30, 6:33 PM EDT	Severe Thunderstorm Warning	RNK	42 min
Apr 30, 7:09 PM EDT	Areal Flood Advisory	RNK	111 min
May 1, 12:43 PM EDT	Mesoscale Discussion	SPC	2 hr
May 3, 1:11 PM EDT	Special Weather Statement	RNK	34 min
May 3, 1:51 PM EDT	Special Weather Statement	RNK	39 min
May 3, 2:54 PM EDT	Severe Thunderstorm Warning	RNK	36 min
May 3, 3:37 PM EDT	Severe Thunderstorm Warning	RNK	53 min
May 8, 3:04 PM EDT	Special Weather Statement	RNK	56 min
May 13, 4:14 AM EDT	Flash Flood Watch	RNK	34 hr
May 15, 5:39 AM EDT	Flash Flood Watch	RNK	17 hr
May 15, 6:19 AM EDT	Dense Fog Advisory	RNK	4 hr
May 15, 2:08 PM EDT	Mesoscale Discussion	SPC	67 min
May 15, 4:57 PM EDT	Flash Flood Warning	RNK	5 hr
May 15, 5:43 PM EDT	Special Weather Statement	RNK	62 min
May 16, 3:17 AM EDT	Dense Fog Advisory	RNK	7 hr
May 22, 3:27 AM EDT	Flash Flood Watch	RNK	18 hr
May 24, 2:20 PM EDT	Special Weather Statement	RNK	40 min
Jun 1, 1:28 PM EDT	Tornado Watch	SPC	8 hr
Jun 1, 3:16 PM EDT	Special Weather Statement	RNK	29 min
Jun 1, 3:35 PM EDT	Mesoscale Discussion	SPC	55 min
Jun 1, 3:45 PM EDT	Special Weather Statement	RNK	30 min
Jun 24, 2:21 PM EDT	Special Weather Statement	RNK	39 min
Jun 29, 9:13 PM EDT	Severe Thunderstorm Warning	RNK	62 min
Jun 29, 9:37 PM EDT	Severe Thunderstorm Warning	RNK	53 min
Jun 30, 4:27 PM EDT	Mesoscale Discussion	SPC	3 hr
Jun 30, 7:29 PM EDT	Severe Thunderstorm Warning	RNK	46 min
Jun 30, 7:39 PM EDT	Mesoscale Discussion	SPC	3 hr
Jul 1, 9:27 AM EDT	Mesoscale Discussion	SPC	63 min
Jul 1, 9:44 AM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 1, 10:56 AM EDT	Severe Thunderstorm Warning	RNK	50 min
Jul 1, 11:20 AM EDT	Severe Thunderstorm Warning	RNK	55 min
Jul 1, 11:38 AM EDT	Severe Thunderstorm Warning	RNK	52 min
Jul 1, 11:38 AM EDT	Mesoscale Discussion	SPC	97 min
Jul 1, 9:06 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 1, 10:26 PM EDT	Mesoscale Discussion	SPC	94 min
Jul 1, 11:20 PM EDT	Severe Thunderstorm Warning	RNK	55 min
Jul 1, 11:33 PM EDT	Severe Thunderstorm Warning	RNK	57 min
Jul 1, 11:57 PM EDT	Severe Thunderstorm Warning	RNK	63 min
Jul 2, 12:39 AM EDT	Mesoscale Discussion	SPC	96 min
Jul 3, 4:53 PM EDT	Special Weather Statement	RNK	37 min
Jul 3, 6:23 PM EDT	Mesoscale Discussion	SPC	3 hr
Jul 5, 11:14 AM EDT	Mesoscale Discussion	SPC	91 min
Jul 5, 11:37 AM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 5, 11:48 AM EDT	Severe Thunderstorm Warning	RNK	51 min
Jul 5, 1:57 PM EDT	Severe Thunderstorm Warning	RNK	93 min
Jul 5, 2:57 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 8, 11:17 PM EDT	Special Weather Statement	RNK	58 min
Jul 9, 12:16 AM EDT	Special Weather Statement	RNK	29 min
Jul 9, 3:19 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Jul 9, 5:53 PM EDT	Mesoscale Discussion	SPC	97 min
Jul 11, 1:04 PM EDT	Flash Flood Watch	RNK	9 hr
Jul 14, 11:52 AM EDT	Flash Flood Watch	RNK	9 hr
Jul 14, 3:02 PM EDT	Areal Flood Advisory	RNK	3 hr
Jul 18, 12:27 PM EDT	Special Weather Statement	RNK	33 min
Jul 18, 12:35 PM EDT	Special Weather Statement	RNK	40 min
Jul 19, 3:40 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 19, 7:17 PM EDT	Mesoscale Discussion	SPC	88 min
Jul 22, 2:20 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 22, 4:19 PM EDT	Severe Thunderstorm Warning	RNK	28 min
Jul 23, 12:58 PM EDT	Mesoscale Discussion	SPC	3 hr
Jul 24, 1:08 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 24, 1:12 PM EDT	Special Weather Statement	RNK	48 min
Jul 24, 1:50 PM EDT	Flash Flood Watch	RNK	3 hr
Jul 25, 2:43 AM EDT	Special Weather Statement	RNK	47 min
Jul 25, 3:11 PM EDT	Mesoscale Discussion	SPC	3 hr
Jul 27, 1:54 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 28, 4:18 PM EDT	Special Weather Statement	RNK	57 min
Jul 31, 1:08 PM EDT	Special Weather Statement	RNK	67 min
Aug 3, 10:28 PM EDT	Special Weather Statement	RNK	32 min
Aug 3, 11:06 PM EDT	Special Weather Statement	RNK	24 min
Aug 5, 7:03 PM EDT	Flash Flood Warning	RNK	5 hr
Aug 5, 7:40 PM EDT	Special Weather Statement	RNK	65 min
Aug 5, 9:11 PM EDT	Special Weather Statement	RNK	64 min
Aug 6, 4:17 AM EDT	Flash Flood Watch	RNK	11 hr
Aug 24, 2:36 PM EDT	Special Weather Statement	RNK	54 min
Sep 6, 1:07 AM EDT	Special Weather Statement	RNK	53 min
Sep 7, 5:08 AM EDT	Dense Fog Advisory	RNK	4 hr
Sep 17, 5:15 AM EDT	Flash Flood Watch	RNK	34 hr
Sep 18, 7:39 AM EDT	Special Weather Statement	RNK	51 min
Sep 18, 9:40 AM EDT	Special Weather Statement	RNK	65 min
Sep 23, 1:58 PM EDT	Frost Advisory	RNK	19 hr
Oct 10, 4:15 AM EDT	Frost Advisory	RNK	29 hr
Oct 10, 4:15 AM EDT	Freeze Warning	RNK	29 hr
Oct 20, 3:13 PM EDT	Frost Advisory	RNK	18 hr
Oct 21, 4:00 PM EDT	Frost Advisory	RNK	17 hr
Oct 27, 3:56 PM EDT	High Wind Watch	RNK	12 hr
Oct 27, 4:20 PM EDT	Winter Storm Watch	RNK	25 hr
Oct 28, 3:35 AM EDT	High Wind Warning	RNK	56 hr
Oct 28, 5:33 PM EDT	Winter Storm Warning	RNK	59 hr
Oct 31, 4:16 AM EDT	Winter Weather Advisory	RNK	11 hr
Dec 8, 2:51 AM EST	Dense Fog Advisory	RNK	5 hr
Dec 19, 3:08 PM EST	High Wind Watch	RNK	14 hr
Dec 20, 4:55 AM EST	Winter Weather Advisory	RNK	56 hr
Dec 20, 5:17 AM EST	High Wind Warning	RNK	58 hr
Dec 25, 5:32 AM EST	Freezing Rain Advisory	RNK	32 hr
Dec 25, 3:02 PM EST	Wind Advisory	RNK	22 hr
Dec 26, 3:48 PM EST	High Wind Warning	RNK	21 hr
Dec 28, 4:16 AM EST	Winter Weather Advisory	RNK	56 hr
Dec 29, 6:15 AM EST	Wind Advisory	RNK	30 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	24
Tornado Warning	2
Severe Thunderstorm Watch	8
Tornado Watch	2
Mesoscale Discussion	31
Special Weather Statement	46
Flooding
Flash Flood Warning	2
Flash Flood Watch	9
Flood Watch	1
Areal Flood Advisory	3
Winter
Winter Storm Warning	2
Winter Storm Watch	2
Freezing Rain Advisory	2
Winter Weather Advisory	8
Cold
Freeze Warning	6
Freeze Watch	4
Frost Advisory	5
Wind Chill Advisory	1
Wind and dust
High Wind Warning	6
High Wind Watch	3
Wind Advisory	9
Fire
Red Flag Warning	2
Fire Weather Watch	2
Fog and smoke
Dense Fog Advisory	4

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2011 2013

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.