Alert archive / Louisiana / Jefferson Parish

Weather alerts in Jefferson Parish, Louisiana, 2021

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

Jefferson Parish and its neighbors

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

Alerts: 162
Warnings: 49
Watches: 4
Advisories: 46
Busiest month: April35 alerts
Busiest day: April 13, 202110 alerts

Over time

By month

Warning verification

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

0 of 6 tornado warnings covering Jefferson Parish in 2021 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.

Jefferson Parish, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	6	0	100%	1	0%
Severe thunderstorm warnings	11	4	64%	7	0%
Flash flood warnings	25	12	52%	10	100%	75 min

Each office's whole area, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS New Orleans, LA: tornado warnings	79	16	80%	39	69%	8 min
NWS New Orleans, LA: severe thunderstorm warnings	154	36	77%	116	57%	14 min
NWS New Orleans, LA: flash flood warnings	130	52	60%	134	85%	91 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, 1:31 AM CST	Special Weather Statement	LIX	59 min
Feb 11, 11:35 AM CST	Areal Flood Advisory	LIX	3 hr
Feb 11, 12:04 PM CST	Areal Flood Advisory	LIX	3 hr
Feb 17, 5:38 PM CST	Mesoscale Discussion	SPC	3 hr
Feb 17, 7:50 PM CST	Special Weather Statement	LIX	85 min
Mar 15, 7:04 PM CDT	Areal Flood Warning	LIX	11 min
Mar 15, 7:15 PM CDT	Flash Flood Warning	LIX	53 min
Mar 17, 1:45 PM CDT	Mesoscale Discussion	SPC	90 min
Mar 17, 2:38 PM CDT	Tornado Watch	SPC	8 hr
Mar 17, 7:26 PM CDT	Mesoscale Discussion	SPC	94 min
Mar 23, 12:47 PM CDT	Areal Flood Advisory	LIX	3 hr
Mar 23, 1:08 PM CDT	Flash Flood Warning	LIX	2 hr
Mar 23, 1:48 PM CDT	Areal Flood Advisory	LIX	3 hr
Mar 23, 4:09 PM CDT	Areal Flood Advisory	LIX	3 hr
Mar 23, 7:35 PM CDT	Areal Flood Advisory	LIX	5 hr
Mar 24, 2:10 AM CDT	Special Weather Statement	LIX	65 min
Mar 24, 2:16 AM CDT	Severe Thunderstorm Warning	LIX	14 min
Mar 24, 3:59 AM CDT	Special Weather Statement	LIX	61 min
Apr 8, 3:42 AM CDT	Flash Flood Warning	LIX	5 hr
Apr 8, 4:00 AM CDT	Tornado Warning	LIX	12 min
Apr 8, 4:15 AM CDT	Special Weather Statement	LIX	60 min
Apr 8, 4:22 AM CDT	Tornado Warning	LIX	23 min
Apr 8, 5:14 AM CDT	Special Weather Statement	LIX	61 min
Apr 9, 2:49 AM CDT	Mesoscale Discussion	SPC	2 hr
Apr 10, 4:58 AM CDT	Severe Thunderstorm Warning	LIX	47 min
Apr 10, 5:46 AM CDT	Special Weather Statement	LIX	59 min
Apr 10, 6:07 AM CDT	Areal Flood Advisory	LIX	2 hr
Apr 10, 6:33 AM CDT	Flash Flood Warning	LIX	105 min
Apr 10, 6:42 AM CDT	Special Weather Statement	LIX	78 min
Apr 10, 12:28 PM CDT	Special Weather Statement	LIX	32 min
Apr 13, 11:43 AM CDT	Mesoscale Discussion	SPC	2 hr
Apr 13, 12:05 PM CDT	Special Weather Statement	LIX	55 min
Apr 13, 12:06 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 13, 1:14 PM CDT	Special Weather Statement	LIX	31 min
Apr 13, 1:54 PM CDT	Flash Flood Warning	LIX	111 min
Apr 13, 2:17 PM CDT	Special Weather Statement	LIX	28 min
Apr 13, 2:22 PM CDT	Severe Thunderstorm Warning	LIX	38 min
Apr 13, 2:44 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 13, 2:48 PM CDT	Special Weather Statement	LIX	57 min
Apr 13, 3:45 PM CDT	Severe Thunderstorm Warning	LIX	15 min
Apr 14, 10:11 AM CDT	Special Weather Statement	LIX	34 min
Apr 14, 10:47 AM CDT	Special Weather Statement	LIX	28 min
Apr 14, 1:02 PM CDT	Special Weather Statement	LIX	28 min
Apr 14, 1:32 PM CDT	Special Weather Statement	LIX	28 min
Apr 14, 5:03 PM CDT	Areal Flood Advisory	LIX	3 hr
Apr 14, 6:24 PM CDT	Special Weather Statement	LIX	96 min
Apr 15, 8:16 AM CDT	Special Weather Statement	LIX	89 min
Apr 16, 7:51 AM CDT	Special Weather Statement	LIX	24 min
Apr 17, 10:17 AM CDT	Mesoscale Discussion	SPC	118 min
Apr 17, 11:57 AM CDT	Areal Flood Advisory	LIX	3 hr
Apr 17, 1:25 PM CDT	Flash Flood Warning	LIX	3 hr
Apr 30, 4:32 PM CDT	Special Weather Statement	LIX	58 min
Apr 30, 5:30 PM CDT	Special Weather Statement	LIX	60 min
May 2, 9:33 AM CDT	Special Weather Statement	LIX	42 min
May 2, 10:20 AM CDT	Special Weather Statement	LIX	55 min
May 2, 7:51 PM CDT	Special Weather Statement	LIX	54 min
May 5, 12:47 AM CDT	Areal Flood Advisory	LIX	103 min
May 5, 8:00 AM CDT	Areal Flood Advisory	LIX	2 hr
May 5, 8:25 AM CDT	Flash Flood Warning	LIX	2 hr
May 10, 2:43 AM CDT	Areal Flood Advisory	LIX	2 hr
May 10, 2:57 AM CDT	Flash Flood Warning	LIX	9 hr
May 10, 4:20 AM CDT	Flash Flood Warning	LIX	115 min
May 11, 7:11 AM CDT	Areal Flood Advisory	LIX	32 min
May 11, 7:43 AM CDT	Flash Flood Warning	LIX	77 min
May 11, 7:49 AM CDT	Areal Flood Advisory	LIX	116 min
May 11, 12:28 PM CDT	Areal Flood Advisory	LIX	2 hr
May 12, 12:31 AM CDT	Areal Flood Advisory	LIX	2 hr
May 12, 1:58 AM CDT	Areal Flood Advisory	LIX	81 min
May 12, 1:58 AM CDT	Severe Thunderstorm Warning	LIX	32 min
May 12, 2:08 AM CDT	Tornado Warning	LIX	12 min
May 18, 3:10 AM CDT	Mesoscale Discussion	SPC	95 min
May 18, 3:17 AM CDT	Severe Thunderstorm Warning	LIX	13 min
May 18, 3:20 AM CDT	Tornado Warning	LIX	16 min
May 18, 3:57 AM CDT	Special Weather Statement	LIX	63 min
May 18, 4:50 AM CDT	Flash Flood Warning	LIX	3 hr
May 18, 5:13 AM CDT	Special Weather Statement	LIX	62 min
May 18, 5:26 AM CDT	Severe Thunderstorm Warning	LIX	49 min
May 20, 3:42 AM CDT	Special Weather Statement	LIX	63 min
May 20, 7:00 AM CDT	Special Weather Statement	LIX	60 min
May 20, 7:39 AM CDT	Tornado Warning	LIX	8 min
May 20, 5:16 PM CDT	Areal Flood Advisory	LIX	3 hr
Jun 6, 9:56 AM CDT	Mesoscale Discussion	SPC	3 hr
Jun 13, 1:04 PM CDT	Special Weather Statement	LIX	41 min
Jun 13, 4:55 PM CDT	Special Weather Statement	LIX	35 min
Jun 18, 7:15 PM CDT	Areal Flood Advisory	LIX	101 min
Jun 20, 8:43 AM CDT	Special Weather Statement	LIX	62 min
Jun 21, 2:39 PM CDT	Areal Flood Advisory	LIX	3 hr
Jun 21, 3:39 PM CDT	Flash Flood Warning	LIX	3 hr
Jun 21, 4:16 PM CDT	Severe Thunderstorm Warning	LIX	44 min
Jun 23, 11:01 AM CDT	Flash Flood Warning	LIX	3 hr
Jun 28, 11:47 AM CDT	Special Weather Statement	LIX	28 min
Jul 3, 1:23 PM CDT	Areal Flood Advisory	LIX	3 hr
Jul 3, 1:31 PM CDT	Flash Flood Warning	LIX	111 min
Jul 3, 2:25 PM CDT	Flash Flood Warning	LIX	3 hr
Jul 3, 3:02 PM CDT	Flash Flood Warning	LIX	3 hr
Jul 4, 2:22 PM CDT	Areal Flood Advisory	LIX	53 min
Jul 5, 4:38 AM CDT	Flash Flood Warning	LIX	88 min
Jul 5, 3:15 PM CDT	Areal Flood Advisory	LIX	89 min
Jul 11, 4:32 PM CDT	Areal Flood Advisory	LIX	40 min
Jul 11, 5:12 PM CDT	Flash Flood Warning	LIX	49 min
Jul 12, 11:07 AM CDT	Severe Thunderstorm Warning	LIX	8 min
Jul 12, 12:23 PM CDT	Special Weather Statement	LIX	67 min
Jul 15, 11:42 AM CDT	Special Weather Statement	LIX	63 min
Jul 15, 12:31 PM CDT	Areal Flood Advisory	LIX	65 min
Jul 15, 12:48 PM CDT	Flash Flood Warning	LIX	49 min
Jul 16, 1:20 PM CDT	Areal Flood Advisory	LIX	103 min
Jul 16, 4:06 PM CDT	Special Weather Statement	LIX	24 min
Jul 17, 11:51 AM CDT	Areal Flood Advisory	LIX	54 min
Jul 17, 1:01 PM CDT	Areal Flood Advisory	LIX	119 min
Jul 25, 10:53 AM CDT	Special Weather Statement	LIX	52 min
Jul 25, 12:08 PM CDT	Special Weather Statement	LIX	52 min
Jul 29, 12:51 PM CDT	Special Weather Statement	LIX	39 min
Aug 2, 12:32 PM CDT	Special Weather Statement	LIX	43 min
Aug 3, 3:00 PM CDT	Areal Flood Advisory	LIX	3 hr
Aug 3, 3:39 PM CDT	Areal Flood Advisory	LIX	119 min
Aug 10, 2:05 PM CDT	Flash Flood Warning	LIX	81 min
Aug 11, 12:21 PM CDT	Special Weather Statement	LIX	69 min
Aug 13, 1:33 PM CDT	Areal Flood Advisory	LIX	3 hr
Aug 17, 5:10 PM CDT	Areal Flood Advisory	LIX	2 hr
Aug 23, 7:28 PM CDT	Special Weather Statement	LIX	47 min
Aug 25, 6:38 PM CDT	Special Weather Statement	LIX	37 min
Aug 26, 1:04 PM CDT	Areal Flood Advisory	LIX	3 hr
Aug 29, 5:07 AM CDT	Mesoscale Discussion	SPC	2 hr
Aug 29, 6:07 AM CDT	Tornado Watch	SPC	13 hr
Aug 29, 7:49 AM CDT	Extreme Wind Warning	LIX	3 hr
Aug 29, 10:30 AM CDT	Extreme Wind Warning	LIX	3 hr
Aug 29, 1:26 PM CDT	Extreme Wind Warning	LIX	3 hr
Aug 29, 4:08 PM CDT	Flash Flood Warning Emergency	LIX	8 hr
Aug 29, 4:23 PM CDT	Extreme Wind Warning	LIX	2 hr
Aug 29, 10:48 PM CDT	Flash Flood Warning EmergencyCatastrophic damage threat	LIX	15 hr
Aug 30, 9:58 AM CDT	Areal Flood Warning	LIX	60 hr
Aug 31, 2:49 PM CDT	Flash Flood Warning Considerable damage threat	LIX	88 min
Sep 1, 9:47 PM CDT	Areal Flood Warning	LIX	11 hr
Sep 6, 1:30 PM CDT	Areal Flood Advisory	LIX	81 min
Sep 6, 1:54 PM CDT	Flash Flood Warning	LIX	111 min
Sep 7, 3:37 PM CDT	Areal Flood Advisory	LIX	95 min
Sep 14, 10:41 AM CDT	Areal Flood Advisory	LIX	2 hr
Sep 14, 11:41 AM CDT	Flash Flood Warning	LIX	3 hr
Sep 15, 2:33 AM CDT	Areal Flood Advisory	LIX	117 min
Sep 16, 9:28 AM CDT	Special Weather Statement	LIX	32 min
Sep 17, 7:44 AM CDT	Special Weather Statement	LIX	46 min
Sep 17, 10:58 AM CDT	Special Weather Statement	LIX	32 min
Sep 17, 11:53 AM CDT	Special Weather Statement	LIX	52 min
Sep 18, 12:01 PM CDT	Areal Flood Advisory	LIX	3 hr
Sep 18, 12:24 PM CDT	Areal Flood Advisory	LIX	2 hr
Sep 18, 12:31 PM CDT	Areal Flood Advisory	LIX	2 hr
Sep 19, 2:37 PM CDT	Areal Flood Advisory	LIX	113 min
Sep 28, 5:59 PM CDT	Areal Flood Advisory	LIX	3 hr
Sep 28, 7:39 PM CDT	Special Weather Statement	LIX	66 min
Sep 29, 9:59 AM CDT	Areal Flood Advisory	LIX	3 hr
Sep 29, 10:32 AM CDT	Areal Flood Advisory	LIX	106 min
Oct 3, 12:16 PM CDT	Special Weather Statement	LIX	44 min
Oct 3, 1:48 PM CDT	Areal Flood Advisory	LIX	81 min
Oct 4, 3:14 PM CDT	Special Weather Statement	LIX	46 min
Oct 27, 12:50 PM CDT	Mesoscale Discussion	SPC	85 min
Oct 27, 1:53 PM CDT	Tornado Watch	SPC	8 hr
Oct 27, 3:25 PM CDT	Mesoscale Discussion	SPC	95 min
Oct 27, 5:56 PM CDT	Severe Thunderstorm Warning	LIX	49 min
Oct 27, 6:28 PM CDT	Tornado Warning	LIX	32 min
Oct 27, 6:47 PM CDT	Areal Flood Advisory	LIX	109 min
Oct 27, 6:49 PM CDT	Severe Thunderstorm Warning	LIX	41 min
Dec 18, 7:41 PM CST	Special Weather Statement	LIX	79 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
Extreme Wind Warning	4
Severe Thunderstorm Warning	11
Tornado Warning	6
Severe Thunderstorm Watch	1
Tornado Watch	3
Mesoscale Discussion	12
Special Weather Statement	51
Flooding
Areal Flood Warning	3
Flash Flood Warning	25
Areal Flood Advisory	46

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.