Weather alerts in Union County, Arkansas, 2009

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

Union County and its neighbors

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

Alerts: 211
Warnings: 74
Watches: 45
Advisories: 42
Busiest month: October49 alerts
Busiest day: October 30, 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 Union County in 2009 had a tornado report inside them; 0 of 3 tornado reports fell inside a warning.

Union County, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	5	1	80%	3	0%
Severe thunderstorm warnings	36	17	53%	25	64%	29 min
Flash flood warnings	17	12	29%	23	100%	148 min

Each office's whole area, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Shreveport, LA: tornado warnings	131	51	61%	134	60%	18 min
NWS Shreveport, LA: severe thunderstorm warnings	390	173	56%	463	76%	24 min
NWS Shreveport, LA: flash flood warnings	126	102	19%	356	92%	110 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, Central Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 5, 4:58 AM CST	Flash Flood Watch	SHV	34 hr
Jan 10, 4:00 AM CST	Lake Wind Advisory	SHV	14 hr
Jan 19, 3:03 AM CST	Lake Wind Advisory	SHV	13 hr
Jan 20, 3:48 AM CST	Lake Wind Advisory	SHV	12 hr
Jan 23, 11:16 AM CST	Lake Wind Advisory	SHV	5 hr
Jan 26, 10:20 AM CST	Winter Weather Advisory	SHV	6 hr
Jan 27, 3:59 AM CST	Ice Storm Warning	SHV	25 hr
Jan 27, 8:55 PM CST	Winter Weather Advisory	SHV	10 hr
Feb 8, 9:38 PM CST	Lake Wind Advisory	SHV	20 hr
Feb 10, 3:50 PM CST	Lake Wind Advisory	SHV	14 hr
Feb 11, 12:37 AM CST	Mesoscale Discussion	SPC	53 min
Feb 11, 1:04 AM CST	Tornado Watch	SPC	5 hr
Feb 11, 1:34 AM CST	Severe Thunderstorm Warning	SHV	41 min
Feb 11, 2:10 AM CST	Severe Thunderstorm Warning	SHV	50 min
Feb 11, 2:53 AM CST	Severe Thunderstorm Warning	SHV	52 min
Feb 11, 4:01 AM CST	Mesoscale Discussion	SPC	89 min
Feb 11, 10:55 AM CST	Lake Wind Advisory	SHV	5 hr
Feb 17, 5:44 PM CST	Mesoscale Discussion	SPC	3 hr
Feb 17, 7:09 PM CST	Severe Thunderstorm Watch	SPC	6 hr
Feb 21, 4:55 AM CST	Lake Wind Advisory	SHV	11 hr
Feb 26, 3:34 AM CST	Lake Wind Advisory	SHV	12 hr
Feb 27, 8:29 AM CST	Mesoscale Discussion	SPC	31 min
Feb 27, 8:40 AM CST	Severe Thunderstorm Watch	SPC	6 hr
Feb 27, 10:15 AM CST	Mesoscale Discussion	SPC	90 min
Feb 28, 5:11 AM CST	Lake Wind Advisory	SHV	16 hr
Feb 28, 9:15 PM CST	Lake Wind Advisory	SHV	3 hr
Mar 4, 3:36 PM CST	Lake Wind Advisory	SHV	26 hr
Mar 6, 5:55 AM CST	Lake Wind Advisory	SHV	12 hr
Mar 7, 4:40 AM CST	Lake Wind Advisory	SHV	13 hr
Mar 15, 10:53 AM CDT	River Flood Warning	LZK	5 days
Mar 23, 9:53 PM CDT	Lake Wind Advisory	SHV	21 hr
Mar 27, 5:53 PM CDT	Mesoscale Discussion	SPC	97 min
Mar 27, 6:35 PM CDT	Tornado Watch	SPC	7 hr
Mar 27, 9:21 PM CDT	Lake Wind Advisory	SHV	22 hr
Mar 27, 10:24 PM CDT	Mesoscale Discussion	SPC	96 min
Mar 28, 10:13 AM CDT	River Flood Warning	LZK	10 days
Apr 1, 2:54 PM CDT	Lake Wind Advisory	SHV	31 hr
Apr 2, 4:43 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 2, 7:36 AM CDT	Mesoscale Discussion	SPC	54 min
Apr 5, 3:22 AM CDT	Lake Wind Advisory	SHV	16 hr
Apr 6, 3:49 AM CDT	Freeze Warning	SHV	29 hr
Apr 6, 3:49 AM CDT	Lake Wind Advisory	SHV	18 hr
Apr 8, 3:46 PM CDT	Lake Wind Advisory	SHV	28 hr
Apr 9, 9:10 PM CDT	Tornado Watch	SPC	4 hr
Apr 9, 9:43 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 9, 10:22 PM CDT	Severe Thunderstorm Warning	SHV	53 min
Apr 9, 10:39 PM CDT	Tornado Warning	SHV	66 min
Apr 12, 6:39 AM CDT	Severe Thunderstorm Warning	SHV	51 min
Apr 12, 7:13 AM CDT	Mesoscale Discussion	SPC	92 min
Apr 12, 7:29 AM CDT	Severe Thunderstorm Warning	SHV	31 min
Apr 12, 9:30 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 12, 11:22 AM CDT	Severe Thunderstorm Warning	SHV	38 min
Apr 12, 11:32 AM CDT	Severe Thunderstorm Warning	SHV	43 min
Apr 12, 12:00 PM CDT	Mesoscale Discussion	SPC	90 min
Apr 12, 12:01 PM CDT	Severe Thunderstorm Warning	SHV	29 min
Apr 13, 4:04 AM CDT	Dense Fog Advisory	SHV	4 hr
Apr 14, 10:17 AM CDT	River Flood Warning	LZK	11 days
Apr 16, 3:35 PM CDT	Flash Flood Watch	SHV	54 hr
Apr 25, 3:15 PM CDT	Lake Wind Advisory	SHV	28 hr
Apr 26, 11:50 AM CDT	River Flood Advisory	LZK	43 hr
Apr 27, 2:24 PM CDT	Mesoscale Discussion	SPC	66 min
Apr 27, 2:57 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 27, 7:08 PM CDT	Mesoscale Discussion	SPC	67 min
Apr 29, 3:04 PM CDT	Mesoscale Discussion	SPC	56 min
Apr 29, 3:27 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 29, 6:54 PM CDT	Severe Thunderstorm Warning	SHV	51 min
Apr 30, 3:34 PM CDT	Mesoscale Discussion	SPC	86 min
May 2, 5:27 AM CDT	Flash Flood Watch	SHV	34 hr
May 2, 12:17 PM CDT	Tornado Watch	SPC	7 hr
May 2, 3:47 PM CDT	Mesoscale Discussion	SPC	58 min
May 2, 5:25 PM CDT	Mesoscale Discussion	SPC	95 min
May 2, 6:03 PM CDT	Tornado Watch	SPC	6 hr
May 2, 7:04 PM CDT	Severe Thunderstorm Warning	SHV	26 min
May 2, 7:35 PM CDT	Severe Thunderstorm Warning	SHV	55 min
May 2, 7:38 PM CDT	Mesoscale Discussion	SPC	97 min
May 2, 8:22 PM CDT	Severe Thunderstorm Warning	SHV	38 min
May 2, 9:59 PM CDT	Mesoscale Discussion	SPC	3 hr
May 2, 10:16 PM CDT	Flash Flood Warning	SHV	8 hr
May 2, 10:40 PM CDT	Mesoscale Discussion	SPC	2 hr
May 2, 11:43 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 3, 2:39 AM CDT	Mesoscale Discussion	SPC	2 hr
May 3, 12:17 PM CDT	River Flood Warning	LZK	44 days
May 5, 4:21 AM CDT	Flash Flood Watch	SHV	33 hr
May 5, 10:27 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
May 6, 12:54 AM CDT	Tornado Watch	SPC	5 hr
May 6, 3:05 AM CDT	Mesoscale Discussion	SPC	115 min
May 6, 5:29 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
May 6, 6:58 AM CDT	Mesoscale Discussion	SPC	3 hr
May 6, 10:14 AM CDT	River Flood Warning	SHV	57 days
May 9, 12:33 PM CDT	Mesoscale Discussion	SPC	57 min
May 9, 12:51 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 9, 3:25 PM CDT	Mesoscale Discussion	SPC	65 min
May 9, 4:05 PM CDT	Severe Thunderstorm Warning	SHV	55 min
May 9, 4:06 PM CDT	Flash Flood Watch	SHV	3 days
May 10, 11:17 AM CDT	Mesoscale Discussion	SPC	118 min
May 10, 3:48 PM CDT	Mesoscale Discussion	SPC	87 min
May 11, 10:02 AM CDT	Flash Flood Warning	SHV	4 hr
May 11, 2:36 PM CDT	Flash Flood Warning	SHV	114 min
May 12, 2:20 PM CDT	Mesoscale Discussion	SPC	55 min
May 13, 4:30 AM CDT	Lake Wind Advisory	SHV	15 hr
May 13, 9:48 PM CDT	Flash Flood Watch	SHV	13 hr
May 14, 5:26 AM CDT	Mesoscale Discussion	SPC	64 min
Jun 3, 6:26 AM CDT	Mesoscale Discussion	SPC	2 hr
Jun 3, 4:01 PM CDT	Severe Thunderstorm Warning	SHV	44 min
Jun 3, 4:34 PM CDT	Severe Thunderstorm Warning	SHV	41 min
Jun 3, 5:18 PM CDT	Severe Thunderstorm Warning	SHV	27 min
Jun 3, 5:41 PM CDT	Flash Flood Warning	SHV	2 hr
Jun 10, 6:37 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 10, 11:07 PM CDT	Mesoscale Discussion	SPC	83 min
Jun 10, 11:49 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 10, 11:53 PM CDT	Severe Thunderstorm Warning	SHV	52 min
Jun 11, 12:16 AM CDT	Severe Thunderstorm Warning	SHV	44 min
Jun 11, 12:54 AM CDT	Severe Thunderstorm Warning	SHV	36 min
Jun 24, 3:43 AM CDT	Heat Advisory	SHV	15 hr
Jun 26, 9:58 PM CDT	Heat Advisory	SHV	21 hr
Jul 2, 4:11 PM CDT	Heat Advisory	SHV	53 hr
Jul 9, 5:10 AM CDT	Heat Advisory	SHV	8 days
Jul 16, 3:33 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 16, 6:32 PM CDT	Mesoscale Discussion	SPC	88 min
Jul 16, 7:19 PM CDT	Severe Thunderstorm Warning	SHV	41 min
Jul 16, 7:56 PM CDT	Severe Thunderstorm Warning	SHV	64 min
Jul 21, 3:16 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 21, 4:34 PM CDT	Severe Thunderstorm Warning	SHV	56 min
Jul 27, 3:36 PM CDT	Flash Flood Watch	SHV	29 hr
Jul 28, 1:41 AM CDT	Mesoscale Discussion	SPC	94 min
Jul 28, 5:57 AM CDT	Mesoscale Discussion	SPC	78 min
Jul 28, 7:58 AM CDT	Tornado Watch	SPC	7 hr
Jul 28, 11:25 AM CDT	Mesoscale Discussion	SPC	65 min
Jul 29, 4:32 PM CDT	Flash Flood Watch	SHV	32 hr
Jul 31, 9:40 AM CDT	River Flood Warning	LZK	11 days
Aug 20, 9:57 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Sep 11, 3:25 PM CDT	Flash Flood Watch	SHV	43 hr
Sep 14, 5:09 AM CDT	Flash Flood Watch	SHV	47 hr
Sep 14, 5:35 PM CDT	Severe Thunderstorm Warning	SHV	55 min
Sep 14, 5:37 PM CDT	Flash Flood Warning	SHV	3 hr
Sep 16, 4:29 AM CDT	Flash Flood Watch	SHV	59 hr
Sep 17, 1:13 AM CDT	Areal Flood Advisory	SHV	3 hr
Sep 17, 9:23 AM CDT	River Flood Warning	LZK	13 days
Sep 17, 11:03 AM CDT	Areal Flood Advisory	SHV	117 min
Sep 17, 11:48 AM CDT	Flash Flood Warning	SHV	4 hr
Sep 17, 7:26 PM CDT	Flash Flood Warning	SHV	8 hr
Sep 18, 10:26 AM CDT	Areal Flood Advisory	SHV	109 min
Oct 1, 6:29 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Oct 1, 8:37 PM CDT	Mesoscale Discussion	SPC	83 min
Oct 1, 9:15 PM CDT	Severe Thunderstorm Warning	SHV	60 min
Oct 1, 10:09 PM CDT	Severe Thunderstorm Warning	SHV	36 min
Oct 1, 10:16 PM CDT	Severe Thunderstorm Warning	SHV	59 min
Oct 5, 9:22 AM CDT	River Flood Warning	LZK	75 days
Oct 9, 6:59 AM CDT	Mesoscale Discussion	SPC	3 hr
Oct 9, 8:24 AM CDT	Mesoscale Discussion	SPC	66 min
Oct 9, 8:36 AM CDT	Tornado Watch	SPC	4 hr
Oct 9, 8:42 AM CDT	Severe Thunderstorm Warning	SHV	63 min
Oct 9, 9:28 AM CDT	Severe Thunderstorm Warning	SHV	62 min
Oct 9, 10:54 AM CDT	River Flood Warning	SHV	6 days
Oct 12, 7:41 AM CDT	Areal Flood Advisory	SHV	79 min
Oct 12, 10:36 AM CDT	Areal Flood Advisory	SHV	114 min
Oct 12, 10:44 PM CDT	Flash Flood Watch	SHV	29 hr
Oct 13, 8:46 AM CDT	Areal Flood Advisory	SHV	3 hr
Oct 13, 12:19 PM CDT	Mesoscale Discussion	SPC	116 min
Oct 13, 3:23 PM CDT	Flash Flood Warning	SHV	112 min
Oct 13, 5:24 PM CDT	Flash Flood Warning	SHV	4 hr
Oct 13, 9:24 PM CDT	Areal Flood Advisory	SHV	2 hr
Oct 15, 2:15 AM CDT	Mesoscale Discussion	SPC	3 hr
Oct 15, 5:39 AM CDT	Mesoscale Discussion	SPC	3 hr
Oct 15, 5:55 AM CDT	Flash Flood Watch	SHV	10 hr
Oct 15, 6:41 AM CDT	Severe Thunderstorm Warning	SHV	64 min
Oct 15, 7:08 AM CDT	Severe Thunderstorm Watch	SPC	9 hr
Oct 15, 7:20 AM CDT	Flash Flood Warning	SHV	3 hr
Oct 15, 7:59 AM CDT	Severe Thunderstorm Warning	SHV	46 min
Oct 15, 8:18 AM CDT	Severe Thunderstorm Warning	SHV	57 min
Oct 21, 3:51 PM CDT	Flash Flood Watch	SHV	24 hr
Oct 25, 3:22 PM CDT	Flash Flood Watch	SHV	36 hr
Oct 28, 4:38 AM CDT	Dense Fog Advisory	SHV	4 hr
Oct 28, 3:37 PM CDT	Flash Flood Watch	SHV	48 hr
Oct 29, 1:14 PM CDT	Tornado Watch	SPC	8 hr
Oct 29, 1:55 PM CDT	Tornado Warning	SHV	35 min
Oct 29, 2:56 PM CDT	Tornado Warning	SHV	34 min
Oct 29, 3:03 PM CDT	Mesoscale Discussion	SPC	117 min
Oct 29, 5:24 PM CDT	Mesoscale Discussion	SPC	66 min
Oct 29, 6:48 PM CDT	Tornado Warning	SHV	42 min
Oct 29, 7:49 PM CDT	Flash Flood Warning	SHV	8 hr
Oct 29, 8:09 PM CDT	Tornado Warning	SHV	36 min
Oct 29, 9:07 PM CDT	Mesoscale Discussion	SPC	53 min
Oct 29, 9:29 PM CDT	Severe Thunderstorm Warning	SHV	46 min
Oct 29, 10:21 PM CDT	Flash Flood Warning	SHV	4 hr
Oct 29, 10:30 PM CDT	Mesoscale Discussion	SPC	60 min
Oct 30, 2:13 AM CDT	Flash Flood Warning	SHV	4 hr
Oct 30, 3:45 AM CDT	Flash Flood Warning	SHV	4 hr
Oct 30, 6:15 AM CDT	Areal Flood Warning	SHV	60 min
Oct 30, 6:29 AM CDT	Flash Flood Warning	SHV	3 hr
Oct 30, 7:43 AM CDT	Areal Flood Warning	SHV	2 hr
Nov 26, 5:46 AM CST	Freeze Warning	SHV	27 hr
Nov 29, 5:30 PM CST	Mesoscale Discussion	SPC	90 min
Dec 3, 3:24 AM CST	Freeze Warning	SHV	24 hr
Dec 8, 9:43 AM CST	Mesoscale Discussion	SPC	2 hr
Dec 8, 1:25 PM CST	Tornado Watch	SPC	8 hr
Dec 9, 4:43 AM CST	Lake Wind Advisory	SHV	11 hr
Dec 12, 3:13 PM CST	Dense Fog Advisory	SHV	18 hr
Dec 13, 2:54 PM CST	Dense Fog Advisory	SHV	16 hr
Dec 23, 3:44 AM CST	Flash Flood Watch	SHV	29 hr
Dec 23, 11:07 AM CST	River Flood Warning	LZK	15 days
Dec 23, 2:20 PM CST	Lake Wind Advisory	SHV	38 hr
Dec 23, 7:50 PM CST	Mesoscale Discussion	SPC	85 min
Dec 23, 10:40 PM CST	Severe Thunderstorm Warning	SHV	27 min
Dec 24, 3:30 AM CST	Mesoscale Discussion	SPC	2 hr
Dec 24, 3:37 AM CST	Flash Flood Warning	SHV	4 hr
Dec 24, 4:50 AM CST	Tornado Watch	SPC	7 hr
Dec 24, 5:32 AM CST	Flash Flood Warning	SHV	4 hr
Dec 24, 6:49 AM CST	Severe Thunderstorm Warning	SHV	56 min
Dec 24, 7:33 AM CST	Severe Thunderstorm Warning	SHV	42 min
Dec 24, 10:13 AM CST	Mesoscale Discussion	SPC	62 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	36
Tornado Warning	5
Severe Thunderstorm Watch	17
Tornado Watch	11
Mesoscale Discussion	50
Flooding
Areal Flood Warning	2
Flash Flood Warning	17
River Flood Warning	10
Flash Flood Watch	17
Areal Flood Advisory	7
River Flood Advisory	1
Winter
Ice Storm Warning	1
Winter Weather Advisory	2
Heat
Heat Advisory	4
Cold
Freeze Warning	3
Wind and dust
Lake Wind Advisory	24
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 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.