Alert archive / Louisiana / Bossier Parish

Weather alerts in Bossier Parish, Louisiana, 2021

196 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Bossier Parish and its neighbors

Each county as a circle sized by its count in 2021. Tap one for its archive.

Alerts: 196
Warnings: 56
Watches: 20
Advisories: 61
Busiest month: May33 alerts
Busiest day: March 17, 20218 alerts

Over time

By month

Warning verification

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

3 of 7 tornado warnings covering Bossier Parish in 2021 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 2 minutes after it went out.

Bossier Parish, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	7	3	57%	1	100%	2 min
Severe thunderstorm warnings	26	15	42%	13	92%	16 min
Flash flood warnings	1	0	100%	0

Each office's whole area, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Shreveport, LA: tornado warnings	36	16	56%	35	74%	17 min
NWS Shreveport, LA: severe thunderstorm warnings	221	135	39%	359	71%	22 min
NWS Shreveport, LA: flash flood warnings	34	19	44%	83	82%	129 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 3, 8:08 AM CST	River Flood Warning	SHV	44 days
Jan 6, 8:17 PM CST	River Flood Warning	SHV	11 days
Jan 9, 3:50 AM CST	Winter Storm Watch	SHV	23 hr
Jan 10, 2:55 AM CST	Winter Storm Warning	SHV	29 hr
Jan 14, 9:11 PM CST	Wind Advisory	SHV	21 hr
Jan 22, 3:14 AM CST	Dense Fog Advisory	SHV	7 hr
Jan 29, 2:13 PM CST	Lake Wind Advisory	SHV	28 hr
Jan 31, 3:32 AM CST	Lake Wind Advisory	SHV	14 hr
Feb 4, 3:33 AM CST	Lake Wind Advisory	SHV	14 hr
Feb 11, 3:26 PM CST	Winter Weather Advisory	SHV	21 hr
Feb 12, 4:03 PM CST	Winter Storm Watch	SHV	10 hr
Feb 13, 2:25 AM CST	Winter Storm Warning	SHV	60 hr
Feb 13, 2:57 PM CST	Wind Chill Advisory	SHV	69 hr
Feb 13, 6:01 PM CST	Hard Freeze Warning	SHV	66 hr
Feb 15, 1:08 AM CST	Mesoscale Discussion	SPC	6 hr
Feb 15, 2:12 AM CST	Lake Wind Advisory	SHV	12 hr
Feb 15, 2:27 PM CST	Winter Storm Warning	SHV	67 hr
Feb 18, 9:41 AM CST	Hard Freeze Warning	SHV	24 hr
Feb 19, 9:11 AM CST	Hard Freeze Warning	SHV	25 hr
Feb 19, 9:56 PM CST	Freezing Fog Advisory	SHV	12 hr
Feb 25, 6:07 PM CST	Special Weather Statement	SHV	38 min
Feb 25, 6:50 PM CST	Mesoscale Discussion	SPC	115 min
Feb 27, 9:43 AM CST	River Flood Warning	SHV	21 days
Feb 27, 9:47 AM CST	River Flood Warning	SHV	64 days
Feb 28, 5:54 PM CST	Severe Thunderstorm Watch	SPC	4 hr
Feb 28, 6:07 PM CST	Tornado Warning	SHV	38 min
Feb 28, 6:44 PM CST	Severe Thunderstorm Warning	SHV	31 min
Feb 28, 8:08 PM CST	Tornado Warning	SHV	52 min
Feb 28, 9:01 PM CST	Mesoscale Discussion	SPC	89 min
Mar 1, 12:27 PM CST	River Flood Warning	SHV	11 days
Mar 10, 3:52 AM CST	Lake Wind Advisory	SHV	13 hr
Mar 11, 3:31 AM CST	Lake Wind Advisory	SHV	11 hr
Mar 15, 3:03 AM CDT	Dense Fog Advisory	SHV	7 hr
Mar 15, 3:03 AM CDT	Lake Wind Advisory	SHV	15 hr
Mar 17, 1:32 AM CDT	Mesoscale Discussion	SPC	118 min
Mar 17, 2:45 AM CDT	Lake Wind Advisory	SHV	40 hr
Mar 17, 4:04 AM CDT	Mesoscale Discussion	SPC	86 min
Mar 17, 4:37 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Mar 17, 6:40 AM CDT	Mesoscale Discussion	SPC	95 min
Mar 17, 8:34 AM CDT	Severe Thunderstorm Warning	SHV	56 min
Mar 17, 8:43 AM CDT	Tornado Watch	SPC	4 hr
Mar 17, 9:31 AM CDT	Special Weather Statement	SHV	59 min
Mar 22, 2:12 AM CDT	Lake Wind Advisory	SHV	24 hr
Mar 25, 2:41 AM CDT	Lake Wind Advisory	SHV	15 hr
Mar 27, 2:16 PM CDT	Mesoscale Discussion	SPC	89 min
Mar 27, 3:25 PM CDT	Tornado Watch	SPC	10 hr
Mar 27, 6:42 PM CDT	Mesoscale Discussion	SPC	2 hr
Mar 27, 8:04 PM CDT	Tornado Warning	SHV	41 min
Mar 27, 8:46 PM CDT	Tornado Warning	SHV	19 min
Mar 27, 10:30 PM CDT	Mesoscale Discussion	SPC	2 hr
Mar 27, 10:39 PM CDT	Severe Thunderstorm Warning	SHV	51 min
Mar 27, 11:30 PM CDT	Severe Thunderstorm Warning	SHV	45 min
Mar 30, 6:47 PM CDT	Mesoscale Discussion	SPC	2 hr
Mar 31, 3:27 AM CDT	Lake Wind Advisory	SHV	16 hr
Apr 6, 2:48 AM CDT	Lake Wind Advisory	SHV	28 hr
Apr 7, 11:10 AM CDT	Mesoscale Discussion	SPC	2 hr
Apr 7, 12:38 PM CDT	Tornado Watch	SPC	7 hr
Apr 7, 2:22 PM CDT	Mesoscale Discussion	SPC	53 min
Apr 7, 3:40 PM CDT	Mesoscale Discussion	SPC	65 min
Apr 7, 4:20 PM CDT	Tornado Warning	SHV	40 min
Apr 7, 4:31 PM CDT	Tornado Warning	SHV	19 min
Apr 9, 9:49 AM CDT	Mesoscale Discussion	SPC	116 min
Apr 9, 12:07 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 9, 1:25 PM CDT	Mesoscale Discussion	SPC	95 min
Apr 9, 2:28 PM CDT	Severe Thunderstorm Warning	SHV	32 min
Apr 9, 5:32 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 9, 5:38 PM CDT	Severe Thunderstorm Warning	SHV	67 min
Apr 10, 12:23 AM CDT	Special Weather Statement	SHV	67 min
Apr 10, 12:52 AM CDT	Severe Thunderstorm Watch	SPC	3 hr
Apr 14, 4:13 AM CDT	Special Weather Statement	SHV	62 min
Apr 14, 5:25 AM CDT	Special Weather Statement	SHV	65 min
Apr 14, 5:41 AM CDT	Special Weather Statement	SHV	49 min
Apr 20, 4:40 AM CDT	Lake Wind Advisory	SHV	17 hr
Apr 23, 2:21 PM CDT	Lake Wind Advisory	SHV	17 hr
Apr 24, 2:52 AM CDT	Special Weather Statement	SHV	38 min
Apr 28, 2:03 AM CDT	Lake Wind Advisory	SHV	17 hr
May 3, 3:08 AM CDT	Lake Wind Advisory	SHV	15 hr
May 3, 9:10 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 4, 6:44 AM CDT	Mesoscale Discussion	SPC	2 hr
May 4, 10:44 AM CDT	Special Weather Statement	SHV	46 min
May 4, 10:52 AM CDT	Tornado Watch	SPC	7 hr
May 4, 11:10 AM CDT	Severe Thunderstorm Warning	SHV	50 min
May 4, 11:14 AM CDT	Severe Thunderstorm Warning	SHV	31 min
May 9, 12:14 PM CDT	Mesoscale Discussion	SPC	91 min
May 9, 1:14 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
May 9, 3:42 PM CDT	Mesoscale Discussion	SPC	93 min
May 9, 5:41 PM CDT	Mesoscale Discussion	SPC	2 hr
May 10, 2:25 PM CDT	Severe Thunderstorm Warning	SHV	65 min
May 10, 3:30 PM CDT	Severe Thunderstorm Warning	SHV	45 min
May 10, 3:45 PM CDT	Severe Thunderstorm Warning	SHV	45 min
May 10, 3:58 PM CDT	Severe Thunderstorm Warning	SHV	25 min
May 10, 4:16 PM CDT	Severe Thunderstorm Warning	SHV	44 min
May 10, 11:24 PM CDT	Areal Flood Advisory	SHV	3 hr
May 11, 2:04 AM CDT	Flash Flood Watch	SHV	24 hr
May 12, 5:19 AM CDT	River Flood Warning	SHV	21 days
May 12, 10:24 AM CDT	River Flood Warning	SHV	58 hr
May 13, 12:54 PM CDT	River Flood Warning	SHV	44 days
May 17, 9:06 AM CDT	River Flood Warning	SHV	29 hr
May 17, 1:56 PM CDT	Flash Flood Watch	SHV	5 days
May 18, 2:30 PM CDT	Mesoscale Discussion	SPC	2 hr
May 25, 3:45 PM CDT	Severe Thunderstorm Warning	SHV	45 min
May 25, 4:28 PM CDT	Special Weather Statement	SHV	32 min
May 25, 4:40 PM CDT	Mesoscale Discussion	SPC	65 min
May 25, 4:48 PM CDT	Special Weather Statement	SHV	42 min
May 25, 5:12 PM CDT	Areal Flood Advisory	SHV	2 hr
May 28, 1:46 AM CDT	Special Weather Statement	SHV	44 min
May 28, 2:34 AM CDT	Severe Thunderstorm Warning	SHV	41 min
May 28, 3:15 AM CDT	Severe Thunderstorm Warning	SHV	60 min
May 28, 10:03 AM CDT	River Flood Warning	SHV	21 days
Jun 5, 2:05 PM CDT	Areal Flood Advisory	SHV	115 min
Jun 5, 3:57 PM CDT	Areal Flood Advisory	SHV	2 hr
Jun 5, 5:51 PM CDT	Areal Flood Advisory	SHV	114 min
Jun 5, 8:34 PM CDT	River Flood Warning	SHV	5 days
Jun 6, 9:09 AM CDT	River Flood Warning	SHV	3 days
Jun 7, 3:04 AM CDT	Flash Flood Watch	SHV	52 hr
Jun 7, 12:32 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 7, 2:20 PM CDT	Special Weather Statement	SHV	40 min
Jun 7, 2:51 PM CDT	Areal Flood Advisory	SHV	3 hr
Jun 7, 3:04 PM CDT	Special Weather Statement	SHV	56 min
Jun 7, 3:08 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 7, 3:13 PM CDT	Severe Thunderstorm Warning	SHV	47 min
Jun 8, 10:11 AM CDT	Mesoscale Discussion	SPC	64 min
Jun 8, 11:17 AM CDT	Mesoscale Discussion	SPC	118 min
Jun 8, 12:17 PM CDT	Severe Thunderstorm Warning	SHV	43 min
Jun 13, 10:01 PM CDT	Severe Thunderstorm Warning	SHV	59 min
Jun 14, 3:06 AM CDT	Heat Advisory	SHV	16 hr
Jul 6, 7:12 PM CDT	Special Weather Statement	SHV	48 min
Jul 15, 6:16 PM CDT	Special Weather Statement	SHV	44 min
Jul 19, 8:39 AM CDT	Areal Flood Advisory	SHV	3 hr
Jul 24, 2:38 PM CDT	Heat Advisory	SHV	28 hr
Jul 25, 2:11 PM CDT	Heat Advisory	SHV	29 hr
Jul 26, 2:40 PM CDT	Heat Advisory	SHV	28 hr
Jul 27, 2:18 PM CDT	Heat Advisory	SHV	29 hr
Jul 28, 2:27 PM CDT	Heat Advisory	SHV	29 hr
Jul 29, 1:58 PM CDT	Heat Advisory	SHV	3 days
Jul 30, 3:07 AM CDT	Excessive Heat Warning	SHV	64 hr
Aug 9, 2:55 AM CDT	Heat Advisory	SHV	16 hr
Aug 9, 7:04 PM CDT	Heat Advisory	SHV	3 days
Aug 17, 9:54 PM CDT	Special Weather Statement	SHV	51 min
Aug 18, 5:30 PM CDT	Areal Flood Advisory	SHV	2 hr
Aug 19, 1:26 PM CDT	Special Weather Statement	SHV	34 min
Aug 19, 1:29 PM CDT	Special Weather Statement	SHV	46 min
Aug 21, 2:07 AM CDT	Heat Advisory	SHV	5 days
Aug 26, 3:53 AM CDT	Heat Advisory	SHV	14 hr
Aug 31, 3:03 PM CDT	Heat Advisory	SHV	28 hr
Sep 1, 7:22 PM CDT	Special Weather Statement	SHV	38 min
Sep 1, 7:57 PM CDT	Severe Thunderstorm Warning	SHV	41 min
Sep 1, 8:38 PM CDT	Special Weather Statement	SHV	52 min
Sep 2, 3:13 AM CDT	Heat Advisory	SHV	16 hr
Sep 14, 2:52 AM CDT	Lake Wind Advisory	SHV	12 hr
Sep 17, 10:03 AM CDT	Flash Flood Warning	SHV	110 min
Oct 10, 3:47 AM CDT	Lake Wind Advisory	SHV	21 hr
Oct 10, 11:07 PM CDT	Tornado Watch	SPC	5 hr
Oct 11, 12:58 AM CDT	Mesoscale Discussion	SPC	92 min
Oct 11, 2:43 AM CDT	Special Weather Statement	SHV	47 min
Oct 15, 2:56 AM CDT	Lake Wind Advisory	SHV	17 hr
Oct 27, 9:44 AM CDT	Mesoscale Discussion	SPC	2 hr
Oct 27, 10:08 AM CDT	Tornado Watch	SPC	5 hr
Oct 27, 11:06 AM CDT	Severe Thunderstorm Warning	SHV	39 min
Oct 27, 11:30 AM CDT	Severe Thunderstorm Warning	SHV	45 min
Oct 27, 11:40 AM CDT	Severe Thunderstorm Warning	SHV	65 min
Oct 27, 12:12 PM CDT	Special Weather Statement	SHV	63 min
Oct 27, 12:52 PM CDT	Mesoscale Discussion	SPC	83 min
Oct 27, 3:07 PM CDT	Lake Wind Advisory	SHV	52 hr
Nov 7, 5:01 AM CST	Dense Fog Advisory	SHV	4 hr
Nov 11, 12:36 AM CST	Special Weather Statement	SHV	39 min
Nov 11, 1:14 AM CST	Tornado Warning	SHV	22 min
Nov 11, 1:19 AM CST	Mesoscale Discussion	SPC	2 hr
Nov 11, 1:23 AM CST	Special Weather Statement	SHV	67 min
Nov 11, 1:32 AM CST	Severe Thunderstorm Warning	SHV	58 min
Nov 17, 2:48 AM CST	Lake Wind Advisory	SHV	13 hr
Nov 18, 3:31 AM CST	Freeze Warning	SHV	27 hr
Nov 24, 2:39 AM CST	Lake Wind Advisory	SHV	15 hr
Nov 26, 9:30 PM CST	Freeze Warning	SHV	12 hr
Dec 2, 4:53 AM CST	Dense Fog Advisory	SHV	5 hr
Dec 3, 3:41 AM CST	Dense Fog Advisory	SHV	6 hr
Dec 6, 12:36 AM CST	Lake Wind Advisory	SHV	14 hr
Dec 10, 3:49 AM CST	Lake Wind Advisory	SHV	31 hr
Dec 10, 10:00 PM CST	Mesoscale Discussion	SPC	90 min
Dec 10, 10:44 PM CST	Tornado Watch	SPC	6 hr
Dec 10, 11:56 PM CST	Severe Thunderstorm Warning	SHV	49 min
Dec 11, 12:09 AM CST	Severe Thunderstorm Warning	SHV	51 min
Dec 11, 2:00 AM CST	Mesoscale Discussion	SPC	90 min
Dec 11, 2:28 PM CST	Freeze Warning	SHV	19 hr
Dec 16, 2:08 PM CST	Mesoscale Discussion	SPC	3 hr
Dec 16, 2:49 PM CST	Special Weather Statement	SHV	41 min
Dec 18, 3:03 AM CST	Lake Wind Advisory	SHV	15 hr
Dec 21, 5:12 AM CST	Dense Fog Advisory	SHV	5 hr
Dec 23, 2:23 AM CST	Lake Wind Advisory	SHV	14 hr
Dec 23, 2:34 PM CST	Lake Wind Advisory	SHV	36 hr
Dec 26, 3:49 AM CST	Dense Fog Advisory	SHV	6 hr
Dec 28, 2:05 AM CST	Lake Wind Advisory	SHV	13 hr
Dec 29, 9:25 AM CST	Mesoscale Discussion	SPC	2 hr
Dec 29, 12:51 PM CST	Special Weather Statement	SHV	24 min
Dec 29, 4:44 PM CST	Mesoscale Discussion	SPC	2 hr
Dec 29, 8:51 PM CST	Dense Fog Advisory	SHV	14 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	26
Tornado Warning	7
Severe Thunderstorm Watch	8
Tornado Watch	7
Mesoscale Discussion	33
Special Weather Statement	26
Flooding
Flash Flood Warning	1
River Flood Warning	12
Flash Flood Watch	3
Areal Flood Advisory	8
Winter
Winter Storm Warning	3
Winter Storm Watch	2
Winter Weather Advisory	1
Heat
Excessive Heat Warning	1
Heat Advisory	13
Cold
Freeze Warning	3
Hard Freeze Warning	3
Wind Chill Advisory	1
Wind and dust
Lake Wind Advisory	28
Wind Advisory	1
Fog and smoke
Dense Fog Advisory	8
Freezing Fog Advisory	1

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2020 2022

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.