Alert archive / Arkansas / Columbia County

Weather alerts in Columbia County, Arkansas, 2011

175 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Columbia County and its neighbors

Each county as a circle sized by its count in 2011. Tap one for its archive.

Alerts: 175
Warnings: 53
Watches: 29
Advisories: 35
Busiest month: April57 alerts
Busiest day: April 26, 201113 alerts

Over time

By month

Warning verification

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

2 of 3 tornado warnings covering Columbia County in 2011 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 46 minutes after it went out.

Columbia County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	3	2	33%	1	100%	46 min
Severe thunderstorm warnings	36	20	44%	9	56%	7 min
Flash flood warnings	1	0	100%	0

Each office's whole area, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Shreveport, LA: tornado warnings	97	50	48%	104	84%	18 min
NWS Shreveport, LA: severe thunderstorm warnings	423	256	39%	543	78%	24 min
NWS Shreveport, LA: flash flood warnings	13	9	31%	29	97%	97 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 7, 3:30 PM CST	Winter Storm Watch	SHV	28 hr
Jan 8, 3:25 PM CST	Winter Storm Warning	SHV	33 hr
Jan 9, 7:09 AM CST	Mesoscale Discussion	SPC	5 hr
Jan 9, 10:55 AM CST	Mesoscale Discussion	SPC	6 hr
Jan 11, 4:05 AM CST	Hard Freeze Warning	SHV	29 hr
Jan 12, 3:31 PM CST	Hard Freeze Warning	SHV	17 hr
Jan 16, 2:44 PM CST	Areal Flood Advisory	SHV	3 hr
Jan 17, 11:19 PM CST	Dense Fog Advisory	SHV	11 hr
Jan 30, 12:47 PM CST	Mesoscale Discussion	SPC	118 min
Jan 31, 6:47 PM CST	Lake Wind Advisory	SHV	34 hr
Feb 1, 3:30 AM CST	Freeze Warning	SHV	18 hr
Feb 1, 3:31 AM CST	Wind Chill Advisory	SHV	30 hr
Feb 1, 6:46 AM CST	Mesoscale Discussion	SPC	119 min
Feb 1, 9:35 PM CST	Hard Freeze Warning	SHV	11 hr
Feb 2, 3:29 PM CST	Hard Freeze Warning	SHV	16 hr
Feb 2, 3:43 PM CST	Wind Chill Advisory	SHV	17 hr
Feb 3, 6:46 AM CST	Winter Weather Advisory	SHV	20 hr
Feb 4, 2:34 AM CST	Winter Weather Advisory	SHV	12 hr
Feb 4, 5:28 AM CST	Mesoscale Discussion	SPC	6 hr
Feb 7, 3:40 PM CST	Winter Storm Watch	SHV	25 hr
Feb 8, 4:18 PM CST	Winter Storm Warning	SHV	21 hr
Feb 8, 4:18 PM CST	Winter Weather Advisory	SHV	26 hr
Feb 9, 10:03 AM CST	Mesoscale Discussion	SPC	6 hr
Feb 9, 3:56 PM CST	Hard Freeze Warning	SHV	17 hr
Feb 10, 3:43 PM CST	Hard Freeze Warning	SHV	17 hr
Feb 24, 11:25 AM CST	Tornado Watch	SPC	9 hr
Feb 24, 2:39 PM CST	Mesoscale Discussion	SPC	66 min
Feb 24, 5:26 PM CST	Mesoscale Discussion	SPC	94 min
Feb 24, 5:31 PM CST	Severe Thunderstorm Warning	SHV	59 min
Feb 26, 3:18 PM CST	Lake Wind Advisory	SHV	27 hr
Mar 8, 7:30 AM CST	Mesoscale Discussion	SPC	90 min
Mar 8, 12:54 PM CST	Mesoscale Discussion	SPC	36 min
Mar 8, 6:27 PM CST	Mesoscale Discussion	SPC	63 min
Mar 8, 7:37 PM CST	Tornado Watch	SPC	7 hr
Mar 8, 9:40 PM CST	Mesoscale Discussion	SPC	65 min
Mar 21, 3:30 PM CDT	Lake Wind Advisory	SHV	27 hr
Mar 25, 3:43 PM CDT	Mesoscale Discussion	SPC	3 hr
Mar 25, 7:31 PM CDT	Mesoscale Discussion	SPC	89 min
Mar 25, 10:50 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Mar 26, 2:41 AM CDT	Mesoscale Discussion	SPC	2 hr
Mar 26, 2:27 PM CDT	Mesoscale Discussion	SPC	63 min
Mar 26, 4:33 PM CDT	Mesoscale Discussion	SPC	57 min
Mar 26, 7:34 PM CDT	Severe Thunderstorm Warning	SHV	25 min
Mar 27, 1:41 PM CDT	Mesoscale Discussion	SPC	64 min
Mar 29, 5:26 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 2, 4:14 PM CDT	Lake Wind Advisory	SHV	53 hr
Apr 4, 3:44 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 4, 7:44 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
Apr 4, 8:29 AM CDT	Severe Thunderstorm Warning	SHV	61 min
Apr 4, 8:42 AM CDT	Tornado Warning	SHV	48 min
Apr 4, 9:30 AM CDT	Tornado Warning	SHV	45 min
Apr 4, 9:44 AM CDT	Severe Thunderstorm Warning	SHV	46 min
Apr 10, 2:50 AM CDT	Lake Wind Advisory	SHV	16 hr
Apr 11, 4:19 AM CDT	Mesoscale Discussion	SPC	56 min
Apr 11, 9:46 AM CDT	Mesoscale Discussion	SPC	29 min
Apr 14, 3:38 PM CDT	Lake Wind Advisory	SHV	28 hr
Apr 14, 9:06 PM CDT	Tornado Watch	SPC	6 hr
Apr 15, 1:27 AM CDT	Mesoscale Discussion	SPC	93 min
Apr 15, 2:07 AM CDT	Severe Thunderstorm Warning	SHV	53 min
Apr 15, 2:19 AM CDT	Tornado Watch	SPC	8 hr
Apr 15, 2:46 AM CDT	Severe Thunderstorm Warning	SHV	59 min
Apr 16, 4:47 AM CDT	Lake Wind Advisory	SHV	11 hr
Apr 19, 4:15 AM CDT	Lake Wind Advisory	SHV	15 hr
Apr 19, 2:16 PM CDT	Tornado Watch	SPC	10 hr
Apr 19, 11:17 PM CDT	Mesoscale Discussion	SPC	58 min
Apr 19, 11:45 PM CDT	Severe Thunderstorm Watch	SPC	3 hr
Apr 20, 12:46 PM CDT	Mesoscale Discussion	SPC	89 min
Apr 20, 2:04 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 21, 8:20 AM CDT	Severe Thunderstorm Warning	SHV	55 min
Apr 21, 8:25 AM CDT	Severe Thunderstorm Warning	SHV	31 min
Apr 22, 3:55 AM CDT	Lake Wind Advisory	SHV	14 hr
Apr 25, 3:48 AM CDT	Lake Wind Advisory	SHV	21 hr
Apr 25, 4:41 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 25, 7:23 AM CDT	Mesoscale Discussion	SPC	97 min
Apr 25, 3:08 PM CDT	Mesoscale Discussion	SPC	37 min
Apr 25, 3:22 PM CDT	Tornado Watch PDS	SPC	8 hr
Apr 25, 3:49 PM CDT	Flash Flood Watch	SHV	39 hr
Apr 25, 7:34 PM CDT	Mesoscale Discussion	SPC	116 min
Apr 25, 7:49 PM CDT	Severe Thunderstorm Warning	SHV	56 min
Apr 25, 7:56 PM CDT	Tornado Warning	SHV	27 min
Apr 25, 8:45 PM CDT	Severe Thunderstorm Warning	SHV	60 min
Apr 25, 8:49 PM CDT	Severe Thunderstorm Warning	SHV	56 min
Apr 25, 9:28 PM CDT	Severe Thunderstorm Warning	SHV	62 min
Apr 25, 9:44 PM CDT	Severe Thunderstorm Warning	SHV	61 min
Apr 26, 9:49 AM CDT	River Flood Warning	SHV	7 days
Apr 26, 1:11 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 26, 1:44 PM CDT	Tornado Watch PDS	SPC	10 hr
Apr 26, 3:11 PM CDT	Severe Thunderstorm Warning	SHV	49 min
Apr 26, 3:59 PM CDT	Mesoscale Discussion	SPC	91 min
Apr 26, 6:43 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 26, 8:52 PM CDT	Severe Thunderstorm Warning	SHV	38 min
Apr 26, 8:53 PM CDT	Mesoscale Discussion	SPC	97 min
Apr 26, 9:33 PM CDT	Tornado Watch PDS	SPC	7 hr
Apr 26, 10:51 PM CDT	Severe Thunderstorm Warning	SHV	54 min
Apr 27, 4:41 AM CDT	Severe Thunderstorm Warning	SHV	64 min
Apr 27, 4:53 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Apr 27, 5:44 AM CDT	Severe Thunderstorm Warning	SHV	38 min
Apr 27, 5:50 AM CDT	Severe Thunderstorm Warning	SHV	55 min
Apr 27, 6:08 AM CDT	Flash Flood Warning	SHV	4 hr
Apr 27, 7:30 AM CDT	Lake Wind Advisory	SHV	12 hr
Apr 27, 9:48 AM CDT	Mesoscale Discussion	SPC	27 min
Apr 30, 5:17 AM CDT	Flash Flood Watch	SHV	65 hr
May 1, 8:45 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 1, 12:12 PM CDT	Mesoscale Discussion	SPC	93 min
May 1, 12:47 PM CDT	Tornado Watch	SPC	8 hr
May 1, 3:18 PM CDT	Mesoscale Discussion	SPC	87 min
May 1, 5:43 PM CDT	Mesoscale Discussion	SPC	92 min
May 1, 8:10 PM CDT	Mesoscale Discussion	SPC	35 min
May 20, 10:30 AM CDT	Mesoscale Discussion	SPC	60 min
May 20, 11:03 AM CDT	Tornado Watch	SPC	7 hr
May 20, 1:28 PM CDT	Mesoscale Discussion	SPC	62 min
May 20, 4:00 PM CDT	Mesoscale Discussion	SPC	60 min
May 20, 5:56 PM CDT	Tornado Watch	SPC	3 hr
May 20, 9:06 PM CDT	Mesoscale Discussion	SPC	114 min
May 21, 3:38 PM CDT	Mesoscale Discussion	SPC	97 min
May 21, 6:32 PM CDT	Severe Thunderstorm Warning	SHV	43 min
May 21, 7:30 PM CDT	Severe Thunderstorm Warning	SHV	45 min
May 21, 8:31 PM CDT	Mesoscale Discussion	SPC	89 min
May 25, 4:50 AM CDT	Lake Wind Advisory	SHV	14 hr
May 25, 1:53 PM CDT	Mesoscale Discussion	SPC	2 hr
May 25, 3:16 PM CDT	Tornado Watch	SPC	7 hr
May 28, 3:33 AM CDT	Lake Wind Advisory	SHV	15 hr
Jun 5, 4:32 PM CDT	Severe Thunderstorm Warning	SHV	58 min
Jun 5, 5:35 PM CDT	Mesoscale Discussion	SPC	115 min
Jun 17, 3:40 PM CDT	Heat Advisory	SHV	3 days
Jun 28, 11:42 AM CDT	Mesoscale Discussion	SPC	93 min
Jun 28, 11:51 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 28, 3:09 PM CDT	Mesoscale Discussion	SPC	96 min
Jun 28, 6:09 PM CDT	Mesoscale Discussion	SPC	96 min
Jun 30, 12:47 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 30, 4:40 PM CDT	Severe Thunderstorm Warning	SHV	65 min
Jul 4, 6:11 PM CDT	Severe Thunderstorm Warning	SHV	64 min
Jul 5, 5:31 PM CDT	Severe Thunderstorm Warning	SHV	59 min
Jul 5, 6:22 PM CDT	Severe Thunderstorm Warning	SHV	53 min
Jul 9, 4:26 AM CDT	Heat Advisory	SHV	6 days
Jul 15, 2:26 PM CDT	Heat Advisory	SHV	54 hr
Jul 24, 5:13 AM CDT	Heat Advisory	SHV	4 days
Jul 30, 3:32 PM CDT	Heat Advisory	SHV	43 hr
Jul 31, 3:47 PM CDT	Excessive Heat Warning	SHV	6 days
Aug 1, 5:21 AM CDT	Heat Advisory	SHV	10 hr
Aug 6, 2:43 PM CDT	Heat Advisory	SHV	5 days
Aug 7, 1:46 PM CDT	Mesoscale Discussion	SPC	119 min
Aug 17, 9:08 AM CDT	Heat Advisory	SHV	8 days
Aug 20, 3:56 PM CDT	Mesoscale Discussion	SPC	64 min
Aug 20, 5:25 PM CDT	Severe Thunderstorm Warning	SHV	65 min
Aug 23, 2:32 PM CDT	Severe Thunderstorm Warning	SHV	43 min
Aug 23, 4:40 PM CDT	Mesoscale Discussion	SPC	35 min
Aug 24, 11:46 AM CDT	Severe Thunderstorm Warning	SHV	37 min
Aug 24, 11:55 AM CDT	Severe Thunderstorm Warning	SHV	52 min
Aug 24, 12:06 PM CDT	Mesoscale Discussion	SPC	114 min
Sep 4, 5:30 AM CDT	Lake Wind Advisory	SHV	38 hr
Sep 4, 11:31 PM CDT	Red Flag Warning	SHV	20 hr
Sep 18, 5:41 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 18, 9:48 PM CDT	Severe Thunderstorm Warning	SHV	57 min
Sep 18, 10:31 PM CDT	Mesoscale Discussion	SPC	59 min
Sep 18, 10:46 PM CDT	Severe Thunderstorm Warning	SHV	59 min
Sep 22, 3:44 PM CDT	Severe Thunderstorm Warning	SHV	20 min
Sep 22, 4:12 PM CDT	Severe Thunderstorm Warning	SHV	48 min
Sep 22, 4:17 PM CDT	Severe Thunderstorm Warning	SHV	43 min
Sep 22, 4:45 PM CDT	Severe Thunderstorm Warning	SHV	60 min
Sep 27, 1:36 AM CDT	Mesoscale Discussion	SPC	114 min
Oct 17, 7:45 PM CDT	Lake Wind Advisory	SHV	23 hr
Oct 18, 2:08 PM CDT	Red Flag Warning	SHV	29 hr
Oct 18, 9:41 PM CDT	Lake Wind Advisory	SHV	21 hr
Oct 24, 3:37 AM CDT	Dense Fog Advisory	SHV	6 hr
Nov 2, 8:36 PM CDT	Lake Wind Advisory	SHV	19 hr
Nov 8, 10:31 AM CST	Mesoscale Discussion	SPC	29 min
Nov 8, 10:49 AM CST	Tornado Watch	SPC	7 hr
Nov 8, 1:03 PM CST	Mesoscale Discussion	SPC	57 min
Nov 8, 3:48 PM CST	Mesoscale Discussion	SPC	87 min
Nov 8, 5:09 PM CST	Mesoscale Discussion	SPC	66 min
Nov 8, 5:30 PM CST	Tornado Watch	SPC	7 hr
Nov 13, 4:54 AM CST	Lake Wind Advisory	SHV	13 hr
Nov 25, 2:34 AM CST	Dense Fog Advisory	SHV	6 hr
Dec 4, 4:56 AM CST	Flash Flood Watch	SHV	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	36
Tornado Warning	3
Severe Thunderstorm Watch	10
Tornado Watch	14
Mesoscale Discussion	58
Flooding
Flash Flood Warning	1
River Flood Warning	1
Flash Flood Watch	3
Areal Flood Advisory	1
Winter
Winter Storm Warning	2
Winter Storm Watch	2
Winter Weather Advisory	3
Heat
Excessive Heat Warning	1
Heat Advisory	8
Cold
Freeze Warning	1
Hard Freeze Warning	6
Wind Chill Advisory	2
Wind and dust
Lake Wind Advisory	18
Fire
Red Flag Warning	2
Fog and smoke
Dense Fog Advisory	3

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2010 2012

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.