Alert archive / Louisiana / Ascension Parish
Weather alerts in Ascension Parish, Louisiana, 2021
139 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Ascension Parish and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 139
- Warnings
- 55
- Watches
- 4
- Advisories
- 27
- Busiest month
- May34 alerts
- Busiest day
- April 13, 202111 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 3 tornado warnings covering Ascension Parish in 2021 had a tornado report inside them.
Ascension Parish, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 22 | 2 | 91% | 7 | 0% | |
| Flash flood warnings | 16 | 6 | 63% | 8 | 88% | 127 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 6, 9:38 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Feb 11, 9:35 AM CST | Areal Flood Advisory | LIX | 3 hr |
| Feb 11, 10:27 AM CST | Areal Flood Advisory | LIX | 3 hr |
| Feb 15, 3:09 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Mar 17, 1:45 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Mar 17, 2:38 PM CDT | Tornado Watch | SPC | 8 hr |
| Mar 17, 4:05 PM CDT | Severe Thunderstorm Warning | LIX | 40 min |
| Mar 17, 4:44 PM CDT | Severe Thunderstorm Warning | LIX | 34 min |
| Mar 17, 5:06 PM CDT | Special Weather Statement | LIX | 39 min |
| Mar 17, 5:11 PM CDT | Special Weather Statement | LIX | 49 min |
| Mar 17, 5:59 PM CDT | Areal Flood Advisory | LIX | 3 hr |
| Mar 17, 6:27 PM CDT | Severe Thunderstorm Warning | LIX | 63 min |
| Mar 23, 9:41 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 24, 9:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Mar 25, 11:00 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 27, 11:53 AM CDT | River Flood Warning | LIX | 9 days |
| Mar 30, 7:57 PM CDT | River Flood Advisory | LIX | 19 days |
| Mar 30, 7:57 PM CDT | River Flood Advisory | LIX | 19 days |
| Apr 2, 10:49 AM CDT | River Flood Warning | LIX | 6 days |
| Apr 7, 11:44 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 8, 10:10 AM CDT | River Flood Warning | LIX | 12 days |
| Apr 9, 11:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 10, 12:16 AM CDT | Tornado Watch | SPC | 7 hr |
| Apr 10, 3:26 AM CDT | Special Weather Statement | LIX | 64 min |
| Apr 10, 4:47 AM CDT | Special Weather Statement | LIX | 58 min |
| Apr 13, 8:28 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 13, 9:38 AM CDT | Severe Thunderstorm Warning | LIX | 13 min |
| Apr 13, 9:56 AM CDT | Severe Thunderstorm Warning | LIX | 19 min |
| Apr 13, 10:26 AM CDT | Special Weather Statement | LIX | 34 min |
| Apr 13, 10:32 AM CDT | Severe Thunderstorm Warning | LIX | 28 min |
| Apr 13, 10:33 AM CDT | Severe Thunderstorm Warning | LIX | 27 min |
| Apr 13, 10:59 AM CDT | Special Weather Statement | LIX | 46 min |
| Apr 13, 11:43 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 13, 11:53 AM CDT | Special Weather Statement | LIX | 37 min |
| Apr 13, 12:06 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 13, 1:21 PM CDT | Areal Flood Advisory | LIX | 114 min |
| Apr 14, 9:34 AM CDT | Areal Flood Advisory | LIX | 116 min |
| Apr 14, 9:41 AM CDT | Special Weather Statement | LIX | 34 min |
| Apr 15, 5:59 AM CDT | Special Weather Statement | LIX | 31 min |
| Apr 15, 6:28 AM CDT | Severe Thunderstorm Warning | LIX | 18 min |
| Apr 15, 10:04 AM CDT | River Flood Warning | LIX | 21 days |
| Apr 15, 10:04 AM CDT | River Flood Warning | LIX | 5 days |
| Apr 16, 5:23 AM CDT | Special Weather Statement | LIX | 37 min |
| Apr 16, 5:45 AM CDT | Special Weather Statement | LIX | 30 min |
| Apr 16, 6:12 AM CDT | Special Weather Statement | LIX | 48 min |
| Apr 24, 1:50 AM CDT | Severe Thunderstorm Warning | LIX | 25 min |
| Apr 24, 2:17 AM CDT | Special Weather Statement | LIX | 43 min |
| Apr 24, 3:04 AM CDT | Mesoscale Discussion | SPC | 116 min |
| Apr 24, 3:21 AM CDT | Special Weather Statement | LIX | 39 min |
| Apr 24, 3:30 AM CDT | Severe Thunderstorm Warning | LIX | 30 min |
| May 10, 1:00 AM CDT | Special Weather Statement | LIX | 60 min |
| May 10, 1:29 AM CDT | Areal Flood Advisory | LIX | 70 min |
| May 10, 1:54 AM CDT | Severe Thunderstorm Warning | LIX | 51 min |
| May 10, 8:28 AM CDT | Severe Thunderstorm Warning | LIX | 62 min |
| May 10, 9:16 AM CDT | Severe Thunderstorm Warning | LIX | 44 min |
| May 10, 9:38 AM CDT | Tornado Warning | LIX | 20 min |
| May 11, 10:20 AM CDT | Areal Flood Advisory | LIX | 115 min |
| May 11, 8:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| May 11, 10:15 PM CDT | Special Weather Statement | LIX | 30 min |
| May 11, 10:35 PM CDT | Special Weather Statement | LIX | 40 min |
| May 11, 10:37 PM CDT | Severe Thunderstorm Warning | LIX | 30 min |
| May 11, 10:38 PM CDT | Flash Flood Warning | LIX | 3 hr |
| May 11, 11:05 PM CDT | Severe Thunderstorm Warning | LIX | 40 min |
| May 11, 11:41 PM CDT | Severe Thunderstorm Warning | LIX | 64 min |
| May 17, 6:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| May 17, 6:50 PM CDT | Flash Flood Warning | LIX | 5 hr |
| May 17, 6:50 PM CDT | Tornado Warning | LIX | 25 min |
| May 17, 8:48 PM CDT | Flash Flood Warning | LIX | 3 hr |
| May 17, 10:11 PM CDT | Flash Flood Warning | LIX | 15 hr |
| May 17, 11:25 PM CDT | Areal Flood Advisory | LIX | 2 hr |
| May 17, 11:52 PM CDT | Flash Flood Warning | LIX | 3 hr |
| May 17, 11:56 PM CDT | Flash Flood Warning | LIX | 3 hr |
| May 18, 2:17 AM CDT | River Flood Warning | LIX | 21 days |
| May 18, 2:57 AM CDT | Flash Flood Warning | LIX | 6 hr |
| May 18, 9:21 AM CDT | Flash Flood Warning | LIX | 3 hr |
| May 18, 11:24 AM CDT | River Flood Warning | LIX | 8 days |
| May 18, 3:38 PM CDT | Flash Flood Warning | LIX | 4 hr |
| May 19, 9:19 PM CDT | Areal Flood Advisory | LIX | 116 min |
| May 20, 3:42 AM CDT | Special Weather Statement | LIX | 63 min |
| May 20, 8:37 AM CDT | Areal Flood Advisory | LIX | 52 min |
| May 20, 9:29 AM CDT | Flash Flood Warning | LIX | 9 hr |
| May 20, 10:04 AM CDT | Flash Flood Warning | LIX | 13 hr |
| May 20, 2:22 PM CDT | River Flood Warning | LIX | 4 days |
| May 20, 6:42 PM CDT | Flash Flood Warning | LIX | 4 hr |
| Jun 6, 9:07 AM CDT | Tornado Warning | LIX | 14 min |
| Jun 6, 9:56 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 6, 10:46 AM CDT | Areal Flood Advisory | LIX | 4 hr |
| Jun 6, 11:51 AM CDT | Areal Flood Advisory | LIX | 3 hr |
| Jun 15, 1:26 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 15, 3:50 PM CDT | Severe Thunderstorm Warning | LIX | 40 min |
| Jun 15, 4:18 PM CDT | Severe Thunderstorm Warning | LIX | 42 min |
| Jun 15, 4:50 PM CDT | Severe Thunderstorm Warning | LIX | 40 min |
| Jun 22, 4:54 PM CDT | Areal Flood Advisory | LIX | 111 min |
| Jul 2, 6:56 PM CDT | Special Weather Statement | LIX | 34 min |
| Jul 2, 7:15 PM CDT | Flash Flood Warning | LIX | 3 hr |
| Jul 3, 1:48 PM CDT | Areal Flood Advisory | LIX | 44 min |
| Jul 3, 5:10 PM CDT | Areal Flood Advisory | LIX | 3 hr |
| Jul 4, 5:43 PM CDT | Special Weather Statement | LIX | 32 min |
| Jul 6, 1:54 PM CDT | Special Weather Statement | LIX | 36 min |
| Jul 6, 2:34 PM CDT | Special Weather Statement | LIX | 26 min |
| Jul 11, 3:52 PM CDT | Special Weather Statement | LIX | 38 min |
| Jul 13, 2:11 PM CDT | Special Weather Statement | LIX | 34 min |
| Jul 13, 3:00 PM CDT | Special Weather Statement | LIX | 30 min |
| Jul 16, 4:35 PM CDT | Areal Flood Advisory | LIX | 105 min |
| Jul 17, 3:12 PM CDT | Special Weather Statement | LIX | 33 min |
| Jul 17, 3:52 PM CDT | Special Weather Statement | LIX | 38 min |
| Aug 2, 12:36 PM CDT | Special Weather Statement | LIX | 54 min |
| Aug 3, 6:44 AM CDT | Special Weather Statement | LIX | 61 min |
| Aug 3, 10:40 AM CDT | Areal Flood Advisory | LIX | 90 min |
| Aug 3, 10:53 AM CDT | Areal Flood Advisory | LIX | 77 min |
| Aug 3, 3:52 PM CDT | Areal Flood Advisory | LIX | 103 min |
| Aug 12, 2:23 PM CDT | Special Weather Statement | LIX | 37 min |
| Aug 12, 2:58 PM CDT | Areal Flood Advisory | LIX | 2 hr |
| Aug 12, 3:02 PM CDT | Special Weather Statement | LIX | 58 min |
| Aug 23, 5:59 PM CDT | Special Weather Statement | LIX | 46 min |
| Aug 23, 7:13 PM CDT | Flash Flood Warning | LIX | 57 min |
| Aug 28, 10:05 AM CDT | River Flood Warning | LIX | 3 days |
| Aug 28, 1:40 PM CDT | River Flood Warning | LIX | 7 days |
| Aug 29, 5:07 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 30, 12:24 PM CDT | Areal Flood Warning | LIX | 33 hr |
| Aug 31, 9:50 PM CDT | Areal Flood Warning | LIX | 24 hr |
| Sep 1, 9:45 PM CDT | Areal Flood Warning | LIX | 11 hr |
| Sep 7, 4:52 PM CDT | Areal Flood Advisory | LIX | 35 min |
| Sep 14, 9:30 AM CDT | Areal Flood Advisory | LIX | 2 hr |
| Sep 15, 6:13 PM CDT | Areal Flood Advisory | LIX | 3 hr |
| Sep 15, 8:23 PM CDT | Areal Flood Advisory | LIX | 3 hr |
| Sep 16, 7:00 PM CDT | River Flood Warning | LIX | 29 hr |
| Sep 17, 4:54 PM CDT | Flash Flood Warning | LIX | 38 min |
| Sep 30, 3:01 PM CDT | Areal Flood Advisory | LIX | 119 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, 4:06 PM CDT | Severe Thunderstorm Warning | LIX | 39 min |
| Oct 27, 4:46 PM CDT | Severe Thunderstorm Warning | LIX | 44 min |
| Oct 27, 5:22 PM CDT | Severe Thunderstorm Warning | LIX | 38 min |
| Dec 6, 2:51 PM CST | Flash Flood Warning | LIX | 116 min |
| Dec 9, 5:03 PM CST | Mesoscale Discussion | SPC | 87 min |
| Dec 18, 5:19 PM CST | Special Weather Statement | LIX | 56 min |
| Dec 28, 1:18 PM CST | Mesoscale Discussion | SPC | 2 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.