Alert archive / Virginia / Pittsylvania County

Weather alerts in Pittsylvania County, Virginia, 2009

167 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Pittsylvania County and its neighbors

Each county as a circle sized by its count in 2009. Tap one for its archive.

Alerts: 167
Warnings: 65
Watches: 22
Advisories: 19
Busiest month: May35 alerts
Busiest day: May 9, 200911 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 5 tornado warnings covering Pittsylvania County in 2009 had a tornado report inside them; 0 of 2 tornado reports fell inside a warning.

Pittsylvania County, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	5	1	80%	2	0%
Severe thunderstorm warnings	46	28	39%	22	86%	18 min
Flash flood warnings	5	3	40%	1	100%	21 min

Each office's whole area, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Blacksburg, VA: tornado warnings	19	1	95%	9	11%	4 min
NWS Blacksburg, VA: severe thunderstorm warnings	264	144	45%	348	82%	26 min
NWS Blacksburg, VA: flash flood warnings	108	53	51%	135	81%	100 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 6, 3:30 AM EST	Flood Watch	RNK	43 hr
Jan 15, 4:19 AM EST	Wind Chill Advisory	RNK	33 hr
Feb 3, 4:01 AM EST	Winter Weather Advisory	RNK	32 hr
Feb 11, 4:40 AM EST	Wind Advisory	RNK	43 hr
Feb 11, 3:04 PM EST	Fire Weather Watch	RNK	15 hr
Feb 11, 5:32 PM EST	Mesoscale Discussion	SPC	88 min
Feb 11, 8:00 PM EST	Mesoscale Discussion	SPC	60 min
Feb 12, 5:43 AM EST	Red Flag Warning	RNK	15 hr
Feb 28, 5:24 AM EST	Winter Storm Watch	RNK	23 hr
Mar 1, 4:39 AM EST	Winter Storm Warning	RNK	28 hr
Mar 1, 1:16 PM EST	Mesoscale Discussion	SPC	3 hr
Mar 1, 5:01 PM EST	Mesoscale Discussion	SPC	2 hr
Mar 27, 4:12 AM EDT	Dense Fog Advisory	RNK	6 hr
Apr 2, 4:17 AM EDT	Dense Fog Advisory	RNK	5 hr
Apr 3, 3:57 AM EDT	Wind Advisory	RNK	32 hr
Apr 3, 9:34 AM EDT	Special Weather Statement	RNK	71 min
Apr 16, 2:42 PM EDT	Frost Advisory	RNK	17 hr
Apr 20, 2:50 PM EDT	Tornado Watch	SPC	7 hr
Apr 20, 3:31 PM EDT	Severe Thunderstorm Warning	RNK	56 min
Apr 20, 4:57 PM EDT	Mesoscale Discussion	SPC	93 min
Apr 21, 2:12 PM EDT	Mesoscale Discussion	SPC	2 hr
Apr 21, 2:45 PM EDT	Severe Thunderstorm Warning	RNK	40 min
May 4, 12:29 PM EDT	Tornado Watch	SPC	5 hr
May 4, 6:46 PM EDT	Severe Thunderstorm Warning	RNK	32 min
May 4, 7:15 PM EDT	Special Weather Statement	RNK	60 min
May 6, 2:16 PM EDT	Tornado Watch	SPC	6 hr
May 6, 6:55 PM EDT	Severe Thunderstorm Warning	RNK	19 min
May 6, 8:26 PM EDT	Tornado Watch	SPC	8 hr
May 6, 10:50 PM EDT	Mesoscale Discussion	SPC	55 min
May 7, 12:10 AM EDT	Mesoscale Discussion	SPC	95 min
May 7, 5:17 AM EDT	Mesoscale Discussion	SPC	118 min
May 7, 3:03 PM EDT	Mesoscale Discussion	SPC	117 min
May 8, 10:01 PM EDT	Tornado Watch	SPC	4 hr
May 8, 11:37 PM EDT	Mesoscale Discussion	SPC	53 min
May 8, 11:48 PM EDT	Severe Thunderstorm Warning	RNK	42 min
May 9, 12:23 AM EDT	Severe Thunderstorm Warning	RNK	63 min
May 9, 12:29 AM EDT	Severe Thunderstorm Warning	RNK	33 min
May 9, 12:51 AM EDT	Mesoscale Discussion	SPC	84 min
May 9, 12:47 PM EDT	Mesoscale Discussion	SPC	118 min
May 9, 1:04 PM EDT	Severe Thunderstorm Warning	RNK	56 min
May 9, 1:14 PM EDT	Severe Thunderstorm Warning	RNK	40 min
May 9, 1:17 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
May 9, 4:30 PM EDT	Mesoscale Discussion	SPC	90 min
May 15, 3:29 AM EDT	Special Weather Statement	RNK	61 min
May 15, 4:37 AM EDT	Special Weather Statement	RNK	53 min
May 15, 3:33 PM EDT	Severe Thunderstorm Warning	RNK	57 min
May 26, 12:07 PM EDT	Flash Flood Watch	RNK	20 hr
May 28, 3:49 PM EDT	Mesoscale Discussion	SPC	56 min
May 28, 6:14 PM EDT	Areal Flood Advisory	RNK	2 hr
May 29, 1:47 PM EDT	Severe Thunderstorm Warning	RNK	88 min
May 29, 2:28 PM EDT	Severe Thunderstorm Warning	RNK	62 min
May 29, 2:41 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
May 29, 3:28 PM EDT	Severe Thunderstorm Warning	RNK	62 min
May 29, 4:27 PM EDT	Severe Thunderstorm Warning	RNK	78 min
May 29, 5:43 PM EDT	Severe Thunderstorm Warning	RNK	62 min
May 29, 6:01 PM EDT	Mesoscale Discussion	SPC	59 min
May 31, 2:54 AM EDT	Mesoscale Discussion	SPC	2 hr
Jun 3, 12:41 PM EDT	Mesoscale Discussion	SPC	64 min
Jun 3, 2:00 PM EDT	Severe Thunderstorm Warning	RNK	60 min
Jun 3, 2:52 PM EDT	Severe Thunderstorm Warning	RNK	53 min
Jun 3, 4:07 PM EDT	Severe Thunderstorm Warning	RNK	53 min
Jun 4, 4:48 AM EDT	Flood Watch	RNK	31 hr
Jun 4, 1:43 PM EDT	Severe Thunderstorm Warning	RNK	50 min
Jun 4, 1:51 PM EDT	Tornado Warning	RNK	54 min
Jun 4, 2:18 PM EDT	Tornado Warning	RNK	57 min
Jun 4, 2:30 PM EDT	Mesoscale Discussion	SPC	60 min
Jun 4, 2:44 PM EDT	Severe Thunderstorm Warning	RNK	50 min
Jun 4, 2:52 PM EDT	Tornado Watch	SPC	4 hr
Jun 4, 2:56 PM EDT	Tornado Warning	RNK	49 min
Jun 4, 3:00 PM EDT	Flash Flood Warning	RNK	6 hr
Jun 4, 3:04 PM EDT	Severe Thunderstorm Warning	RNK	56 min
Jun 4, 5:06 PM EDT	Flash Flood Warning	RNK	6 hr
Jun 4, 8:38 PM EDT	Areal Flood Warning	RNK	5 hr
Jun 9, 2:31 PM EDT	Mesoscale Discussion	SPC	89 min
Jun 9, 7:05 PM EDT	Mesoscale Discussion	SPC	115 min
Jun 10, 1:57 PM EDT	Mesoscale Discussion	SPC	93 min
Jun 10, 5:56 PM EDT	Severe Thunderstorm Warning	RNK	64 min
Jun 10, 6:08 PM EDT	Special Weather Statement	RNK	67 min
Jun 11, 12:36 PM EDT	Special Weather Statement	RNK	54 min
Jun 11, 1:32 PM EDT	Special Weather Statement	RNK	58 min
Jun 11, 3:47 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 11, 7:28 PM EDT	Severe Thunderstorm Warning	RNK	77 min
Jun 11, 8:24 PM EDT	Mesoscale Discussion	SPC	66 min
Jun 13, 2:11 PM EDT	Special Weather Statement	RNK	34 min
Jun 20, 1:55 PM EDT	Mesoscale Discussion	SPC	95 min
Jul 1, 12:48 PM EDT	Mesoscale Discussion	SPC	57 min
Jul 11, 3:06 PM EDT	Special Weather Statement	RNK	54 min
Jul 11, 4:07 PM EDT	Severe Thunderstorm Warning	RNK	44 min
Jul 11, 6:10 PM EDT	Special Weather Statement	RNK	65 min
Jul 12, 12:21 PM EDT	Mesoscale Discussion	SPC	54 min
Jul 12, 2:47 PM EDT	Severe Thunderstorm Warning	RNK	58 min
Jul 12, 4:02 PM EDT	Special Weather Statement	RNK	28 min
Jul 12, 4:32 PM EDT	Severe Thunderstorm Warning	RNK	43 min
Jul 12, 4:50 PM EDT	Severe Thunderstorm Warning	RNK	70 min
Jul 12, 5:21 PM EDT	Severe Thunderstorm Warning	RNK	69 min
Jul 12, 6:03 PM EDT	Tornado Warning	RNK	27 min
Jul 17, 9:52 AM EDT	Mesoscale Discussion	SPC	83 min
Jul 17, 10:03 AM EDT	Severe Thunderstorm Warning	RNK	57 min
Jul 17, 10:29 AM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 17, 10:34 AM EDT	Severe Thunderstorm Warning	RNK	56 min
Jul 17, 11:21 AM EDT	Tornado Warning	RNK	39 min
Jul 17, 11:30 AM EDT	Areal Flood Advisory	RNK	3 hr
Jul 17, 11:49 AM EDT	Severe Thunderstorm Warning	RNK	56 min
Jul 17, 12:59 PM EDT	Mesoscale Discussion	SPC	91 min
Jul 17, 4:44 PM EDT	Severe Thunderstorm Warning	RNK	61 min
Jul 17, 5:45 PM EDT	Severe Thunderstorm Warning	RNK	90 min
Jul 20, 9:27 AM EDT	Flash Flood Watch	RNK	12 hr
Jul 23, 1:55 PM EDT	Special Weather Statement	RNK	65 min
Jul 23, 8:34 PM EDT	Special Weather Statement	RNK	56 min
Jul 23, 9:28 PM EDT	Special Weather Statement	RNK	62 min
Jul 26, 1:40 PM EDT	Severe Thunderstorm Warning	RNK	65 min
Jul 26, 1:40 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 26, 2:05 PM EDT	Severe Thunderstorm Warning	RNK	42 min
Jul 26, 2:07 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 26, 11:43 PM EDT	Special Weather Statement	RNK	32 min
Jul 28, 6:43 PM EDT	Special Weather Statement	RNK	62 min
Jul 28, 7:05 PM EDT	Special Weather Statement	RNK	55 min
Jul 28, 7:20 PM EDT	Severe Thunderstorm Warning	RNK	55 min
Aug 1, 7:07 PM EDT	Severe Thunderstorm Warning	RNK	53 min
Aug 4, 4:00 PM EDT	Special Weather Statement	RNK	60 min
Aug 4, 4:32 PM EDT	Severe Thunderstorm Warning	RNK	73 min
Aug 5, 5:37 PM EDT	Severe Thunderstorm Warning	RNK	53 min
Aug 5, 6:14 PM EDT	Severe Thunderstorm Warning	RNK	61 min
Aug 5, 6:29 PM EDT	Severe Thunderstorm Warning	RNK	61 min
Aug 5, 6:54 PM EDT	Flash Flood Warning	RNK	6 hr
Aug 5, 7:15 PM EDT	Severe Thunderstorm Warning	RNK	75 min
Aug 5, 7:55 PM EDT	Flash Flood Warning	RNK	6 hr
Aug 10, 7:04 PM EDT	Severe Thunderstorm Warning	RNK	36 min
Aug 11, 1:03 PM EDT	Mesoscale Discussion	SPC	87 min
Aug 11, 3:01 PM EDT	Severe Thunderstorm Warning	RNK	74 min
Aug 11, 3:21 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 17, 4:25 PM EDT	Special Weather Statement	RNK	35 min
Aug 17, 4:56 PM EDT	Special Weather Statement	RNK	64 min
Aug 17, 6:56 PM EDT	Special Weather Statement	RNK	64 min
Aug 19, 3:06 PM EDT	Special Weather Statement	RNK	54 min
Aug 19, 4:01 PM EDT	Special Weather Statement	RNK	59 min
Aug 21, 12:36 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 22, 10:58 AM EDT	Special Weather Statement	RNK	62 min
Aug 22, 11:20 AM EDT	Flash Flood Warning	RNK	3 hr
Aug 22, 11:30 AM EDT	Severe Thunderstorm Warning	RNK	60 min
Aug 22, 12:04 PM EDT	Special Weather Statement	RNK	56 min
Aug 23, 7:23 PM EDT	Special Weather Statement	RNK	67 min
Aug 23, 8:42 PM EDT	Special Weather Statement	RNK	63 min
Aug 24, 1:35 AM EDT	Special Weather Statement	RNK	55 min
Sep 19, 1:25 AM EDT	Dense Fog Advisory	RNK	8 hr
Sep 28, 4:29 PM EDT	Severe Thunderstorm Warning	RNK	61 min
Oct 18, 10:25 AM EDT	Frost Advisory	RNK	24 hr
Oct 19, 3:27 AM EDT	Frost Advisory	RNK	31 hr
Nov 3, 1:44 PM EST	Frost Advisory	RNK	17 hr
Nov 10, 2:46 PM EST	Flood Watch	RNK	45 hr
Nov 11, 4:10 AM EST	Wind Advisory	RNK	50 hr
Nov 11, 10:52 AM EST	River Flood Warning	RNK	64 hr
Nov 11, 10:57 AM EST	Areal Flood Warning	RNK	46 hr
Nov 12, 9:24 AM EST	River Flood Warning	RNK	15 hr
Nov 13, 4:37 AM EST	River Flood Warning	RNK	18 hr
Nov 26, 1:34 AM EST	Dense Fog Advisory	RNK	7 hr
Dec 8, 5:11 AM EST	Wind Advisory	RNK	64 hr
Dec 13, 8:05 PM EST	Dense Fog Advisory	RNK	13 hr
Dec 17, 4:30 AM EST	Winter Storm Watch	RNK	11 hr
Dec 17, 3:20 PM EST	Winter Storm Warning	RNK	60 hr
Dec 18, 1:32 PM EST	Mesoscale Discussion	SPC	4 hr
Dec 18, 7:22 PM EST	Mesoscale Discussion	SPC	5 hr
Dec 24, 4:04 AM EST	Freezing Rain Advisory	RNK	35 hr
Dec 25, 10:29 AM EST	Flood Watch	RNK	6 hr
Dec 26, 8:23 AM EST	River Flood Warning	RNK	14 hr
Dec 30, 3:22 PM EST	Winter Weather Advisory	RNK	21 hr
Dec 30, 10:57 PM EST	Mesoscale Discussion	SPC	6 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	46
Tornado Warning	5
Severe Thunderstorm Watch	7
Tornado Watch	6
Mesoscale Discussion	33
Special Weather Statement	28
Flooding
Areal Flood Warning	2
Flash Flood Warning	5
River Flood Warning	4
Flash Flood Watch	2
Flood Watch	4
Areal Flood Advisory	2
Winter
Winter Storm Warning	2
Winter Storm Watch	2
Freezing Rain Advisory	1
Winter Weather Advisory	2
Cold
Frost Advisory	4
Wind Chill Advisory	1
Wind and dust
Wind Advisory	4
Fire
Red Flag Warning	1
Fire Weather Watch	1
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 2008 2010

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.