Alert archive / Virginia / Amherst County

Weather alerts in Amherst County, Virginia, 2013

164 weather alerts in 2013, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Amherst County and its neighbors

Each county as a circle sized by its count in 2013. Tap one for its archive.

Alerts: 164
Warnings: 37
Watches: 23
Advisories: 34
Busiest month: June27 alerts
Busiest day: January 30, 20137 alerts

Over time

By month

Warning verification

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

Amherst County, 2013

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	12	7	42%	5	60%	31 min
Flash flood warnings	7	3	57%	1	0%

Each office's whole area, 2013

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Blacksburg, VA: tornado warnings	3	0	100%	1	0%
NWS Blacksburg, VA: severe thunderstorm warnings	198	126	36%	389	78%	24 min
NWS Blacksburg, VA: flash flood warnings	69	38	45%	121	73%	101 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 11, 2:37 PM EST	Dense Fog Advisory	RNK	19 hr
Jan 12, 8:01 PM EST	Dense Fog Advisory	RNK	14 hr
Jan 15, 3:05 PM EST	Winter Weather Advisory	RNK	18 hr
Jan 16, 4:29 AM EST	Winter Storm Watch	RNK	11 hr
Jan 16, 3:56 PM EST	Winter Storm Warning	RNK	33 hr
Jan 17, 6:54 PM EST	Mesoscale Discussion	SPC	4 hr
Jan 24, 3:52 PM EST	Winter Weather Advisory	RNK	41 hr
Jan 27, 5:00 AM EST	Freezing Rain Advisory	RNK	29 hr
Jan 29, 4:07 PM EST	Wind Advisory	RNK	69 hr
Jan 30, 4:24 AM EST	Flash Flood Watch	RNK	21 hr
Jan 30, 10:19 AM EST	Mesoscale Discussion	SPC	86 min
Jan 30, 12:54 PM EST	Mesoscale Discussion	SPC	96 min
Jan 30, 3:42 PM EST	Severe Thunderstorm Watch	SPC	5 hr
Jan 30, 4:52 PM EST	Severe Thunderstorm Warning	RNK	53 min
Jan 30, 5:48 PM EST	Severe Thunderstorm Warning	RNK	42 min
Jan 30, 6:39 PM EST	Flash Flood Warning	RNK	6 hr
Jan 30, 7:09 PM EST	Mesoscale Discussion	SPC	66 min
Jan 30, 8:02 PM EST	Flash Flood Warning	RNK	6 hr
Jan 30, 8:06 PM EST	Special Weather Statement	RNK	84 min
Jan 30, 9:48 PM EST	Special Weather Statement	RNK	42 min
Jan 31, 12:34 AM EST	Areal Flood Warning	RNK	9 hr
Jan 31, 3:42 AM EST	River Flood Warning	RNK	18 hr
Feb 7, 3:37 PM EST	Winter Weather Advisory	RNK	16 hr
Feb 8, 4:25 AM EST	Wind Advisory	RNK	26 hr
Feb 21, 4:59 AM EST	Winter Weather Advisory	RNK	53 hr
Feb 25, 4:08 AM EST	Winter Weather Advisory	RNK	38 hr
Feb 26, 6:54 AM EST	Mesoscale Discussion	SPC	4 hr
Mar 4, 5:24 AM EST	Winter Storm Watch	RNK	23 hr
Mar 5, 4:48 AM EST	Winter Storm Warning	RNK	39 hr
Mar 16, 3:55 PM EDT	Mesoscale Discussion	SPC	95 min
Mar 16, 4:16 PM EDT	Special Weather Statement	RNK	59 min
Mar 16, 5:12 PM EDT	Special Weather Statement	RNK	63 min
Mar 17, 5:30 AM EDT	Winter Weather Advisory	RNK	32 hr
Mar 23, 4:15 PM EDT	Winter Storm Warning	RNK	70 hr
Mar 23, 8:54 PM EDT	Winter Weather Advisory	RNK	65 hr
Mar 24, 11:53 AM EDT	Mesoscale Discussion	SPC	6 hr
Apr 4, 4:36 AM EDT	Winter Weather Advisory	RNK	21 hr
Apr 4, 5:04 PM EDT	Winter Storm Warning	RNK	5 hr
Apr 12, 5:05 AM EDT	Mesoscale Discussion	SPC	85 min
Apr 19, 1:27 PM EDT	Mesoscale Discussion	SPC	63 min
Apr 19, 2:31 PM EDT	Tornado Watch	SPC	7 hr
Apr 19, 4:27 PM EDT	Severe Thunderstorm Warning	RNK	63 min
Apr 19, 4:36 PM EDT	Mesoscale Discussion	SPC	114 min
Apr 19, 4:55 PM EDT	Severe Thunderstorm Warning	RNK	65 min
Apr 24, 6:13 PM EDT	Special Weather Statement	RNK	47 min
Apr 24, 6:59 PM EDT	Mesoscale Discussion	SPC	2 hr
May 4, 4:05 AM EDT	Flood Watch	RNK	4 days
May 6, 5:16 PM EDT	Special Weather Statement	RNK	89 min
May 6, 5:51 PM EDT	Areal Flood Advisory	RNK	114 min
May 6, 7:21 PM EDT	Areal Flood Advisory	RNK	3 hr
May 7, 1:12 PM EDT	Special Weather Statement	RNK	48 min
May 7, 2:10 PM EDT	Special Weather Statement	RNK	50 min
May 7, 3:17 PM EDT	Flash Flood Warning	RNK	6 hr
May 7, 5:04 PM EDT	Areal Flood Advisory	RNK	4 hr
May 7, 5:30 PM EDT	Severe Thunderstorm Warning	RNK	60 min
May 7, 7:03 PM EDT	River Flood Warning	RNK	21 hr
May 8, 10:19 AM EDT	Flood Watch	RNK	5 hr
May 9, 12:02 AM EDT	Dense Fog Advisory	RNK	8 hr
May 11, 1:44 PM EDT	Mesoscale Discussion	SPC	91 min
May 11, 7:41 PM EDT	Severe Thunderstorm Warning	RNK	49 min
May 11, 7:58 PM EDT	Special Weather Statement	RNK	32 min
May 13, 4:00 PM EDT	Frost Advisory	RNK	17 hr
May 20, 5:28 PM EDT	Special Weather Statement	RNK	32 min
May 22, 3:53 PM EDT	Mesoscale Discussion	SPC	67 min
May 22, 7:09 PM EDT	Special Weather Statement	RNK	36 min
May 23, 3:37 PM EDT	Mesoscale Discussion	SPC	53 min
May 23, 5:59 PM EDT	Special Weather Statement	RNK	46 min
May 23, 8:08 PM EDT	Severe Thunderstorm Warning	RNK	52 min
May 23, 8:36 PM EDT	Special Weather Statement	RNK	24 min
Jun 6, 1:13 PM EDT	Flood Watch	RNK	30 hr
Jun 6, 4:42 PM EDT	Areal Flood Warning	RNK	3 hr
Jun 6, 5:46 PM EDT	Areal Flood Warning	RNK	3 hr
Jun 6, 9:25 PM EDT	Areal Flood Warning	RNK	4 hr
Jun 7, 1:03 AM EDT	Areal Flood Warning	RNK	4 hr
Jun 9, 8:57 PM EDT	Special Weather Statement	RNK	33 min
Jun 9, 9:00 PM EDT	Flash Flood Watch	RNK	22 hr
Jun 10, 4:36 AM EDT	Special Weather Statement	RNK	84 min
Jun 10, 5:52 AM EDT	Special Weather Statement	RNK	53 min
Jun 10, 12:56 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 10, 2:02 PM EDT	Tornado Watch	SPC	10 hr
Jun 10, 4:38 PM EDT	Mesoscale Discussion	SPC	97 min
Jun 13, 11:38 AM EDT	Mesoscale Discussion	SPC	67 min
Jun 13, 12:19 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 13, 12:28 PM EDT	Severe Thunderstorm Warning	RNK	47 min
Jun 13, 1:45 PM EDT	Severe Thunderstorm Warning	RNK	60 min
Jun 13, 2:20 PM EDT	Mesoscale Discussion	SPC	55 min
Jun 13, 2:22 PM EDT	Severe Thunderstorm Warning	RNK	53 min
Jun 18, 10:40 AM EDT	Flash Flood Watch	RNK	7 hr
Jun 26, 1:19 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 26, 2:55 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 26, 4:38 PM EDT	Mesoscale Discussion	SPC	97 min
Jun 26, 4:44 PM EDT	Severe Thunderstorm Warning	RNK	46 min
Jun 29, 10:28 PM EDT	Special Weather Statement	RNK	62 min
Jun 30, 11:48 AM EDT	Mesoscale Discussion	SPC	2 hr
Jun 30, 5:13 PM EDT	Flash Flood Warning	RNK	6 hr
Jun 30, 5:20 PM EDT	Flash Flood Warning	RNK	6 hr
Jul 2, 4:19 AM EDT	Flash Flood Watch	RNK	5 days
Jul 2, 3:12 PM EDT	Areal Flood Advisory	RNK	3 hr
Jul 3, 2:43 AM EDT	Special Weather Statement	RNK	62 min
Jul 6, 4:00 PM EDT	Flash Flood Watch	RNK	29 hr
Jul 7, 4:35 PM EDT	Special Weather Statement	RNK	55 min
Jul 8, 3:58 PM EDT	Special Weather Statement	RNK	47 min
Jul 11, 4:48 AM EDT	Flash Flood Watch	RNK	44 hr
Jul 11, 5:16 PM EDT	Special Weather Statement	RNK	29 min
Jul 11, 6:39 PM EDT	Areal Flood Advisory	RNK	3 hr
Jul 11, 7:26 PM EDT	Flash Flood Warning	RNK	4 hr
Jul 11, 8:25 PM EDT	Areal Flood Warning	RNK	3 hr
Jul 12, 12:05 AM EDT	Areal Flood Warning	RNK	6 hr
Jul 17, 2:22 PM EDT	Mesoscale Discussion	SPC	83 min
Jul 17, 2:30 PM EDT	Special Weather Statement	RNK	60 min
Jul 20, 6:47 PM EDT	Flash Flood Warning	RNK	3 hr
Jul 20, 8:15 PM EDT	Mesoscale Discussion	SPC	60 min
Jul 21, 2:42 PM EDT	Special Weather Statement	RNK	63 min
Jul 22, 10:46 AM EDT	Flash Flood Watch	RNK	13 hr
Jul 28, 2:41 PM EDT	Special Weather Statement	RNK	34 min
Jul 28, 9:42 PM EDT	Special Weather Statement	RNK	33 min
Jul 28, 10:16 PM EDT	Special Weather Statement	RNK	59 min
Aug 1, 4:21 PM EDT	Special Weather Statement	RNK	39 min
Aug 10, 11:56 AM EDT	Mesoscale Discussion	SPC	94 min
Aug 11, 5:18 AM EDT	Special Weather Statement	RNK	57 min
Aug 11, 6:53 PM EDT	Areal Flood Advisory	RNK	112 min
Aug 20, 2:18 AM EDT	Dense Fog Advisory	RNK	8 hr
Aug 21, 11:36 PM EDT	Special Weather Statement	RNK	39 min
Aug 22, 12:09 AM EDT	Special Weather Statement	RNK	51 min
Aug 22, 2:26 PM EDT	Mesoscale Discussion	SPC	3 hr
Aug 22, 4:37 PM EDT	Severe Thunderstorm Warning	RNK	53 min
Aug 23, 3:11 PM EDT	Special Weather Statement	RNK	34 min
Sep 1, 2:28 PM EDT	Special Weather Statement	RNK	17 min
Sep 11, 5:52 PM EDT	Special Weather Statement	RNK	53 min
Sep 12, 7:42 PM EDT	Special Weather Statement	RNK	33 min
Sep 12, 8:07 PM EDT	Special Weather Statement	RNK	23 min
Oct 7, 6:31 AM EDT	Special Weather Statement	RNK	29 min
Oct 7, 7:32 AM EDT	Special Weather Statement	RNK	58 min
Oct 20, 12:04 PM EDT	Frost Advisory	RNK	21 hr
Oct 23, 2:42 PM EDT	Frost Advisory	RNK	18 hr
Oct 24, 9:40 AM EDT	Freeze Watch	RNK	23 hr
Oct 25, 3:52 AM EDT	Freeze Warning	RNK	29 hr
Oct 31, 4:43 AM EDT	Wind Advisory	RNK	26 hr
Nov 1, 1:06 AM EDT	Special Weather Statement	RNK	54 min
Nov 1, 1:58 AM EDT	Special Weather Statement	RNK	62 min
Nov 1, 3:37 AM EDT	Mesoscale Discussion	SPC	83 min
Nov 1, 7:15 AM EDT	Special Weather Statement	RNK	60 min
Nov 9, 10:50 PM EST	Fire Weather Watch	RNK	10 hr
Nov 10, 8:50 AM EST	Red Flag Warning	RNK	9 hr
Nov 17, 3:06 AM EST	Dense Fog Advisory	RNK	6 hr
Nov 17, 6:02 AM EST	Wind Advisory	RNK	22 hr
Nov 23, 11:55 AM EST	Fire Weather Watch	RNK	16 hr
Nov 24, 4:17 AM EST	Red Flag Warning	RNK	11 hr
Nov 25, 5:03 AM EST	Winter Weather Advisory	RNK	34 hr
Nov 25, 5:03 AM EST	Winter Weather Advisory	RNK	34 hr
Nov 26, 3:39 AM EST	Mesoscale Discussion	SPC	4 hr
Nov 26, 4:28 AM EST	Wind Advisory	RNK	42 hr
Nov 26, 11:05 AM EST	Flood Watch	RNK	18 hr
Nov 26, 11:22 AM EST	High Wind Warning	RNK	9 hr
Nov 26, 3:00 PM EST	Winter Weather Advisory	RNK	32 hr
Dec 6, 5:09 AM EST	Winter Storm Watch	RNK	25 hr
Dec 7, 5:45 AM EST	Winter Storm Warning	RNK	51 hr
Dec 8, 11:05 AM EST	Mesoscale Discussion	SPC	3 hr
Dec 9, 2:39 PM EST	Winter Weather Advisory	RNK	21 hr
Dec 13, 3:30 PM EST	Winter Weather Advisory	RNK	34 hr
Dec 21, 9:46 PM EST	Wind Advisory	RNK	14 hr
Dec 22, 3:23 AM EST	Flood Watch	RNK	33 hr
Dec 22, 8:47 AM EST	Special Weather Statement	RNK	43 min
Dec 23, 5:03 AM EST	Special Weather Statement	RNK	72 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
Severe Thunderstorm Watch	3
Tornado Watch	2
Mesoscale Discussion	28
Special Weather Statement	42
Flooding
Areal Flood Warning	7
Flash Flood Warning	7
River Flood Warning	2
Flash Flood Watch	7
Flood Watch	5
Areal Flood Advisory	6
Winter
Winter Storm Warning	5
Winter Storm Watch	3
Freezing Rain Advisory	1
Winter Weather Advisory	13
Cold
Freeze Warning	1
Freeze Watch	1
Frost Advisory	3
Wind and dust
High Wind Warning	1
Wind Advisory	6
Fire
Red Flag Warning	2
Fire Weather Watch	2
Fog and smoke
Dense Fog Advisory	5

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2012 2014

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.