Alert archive / Louisiana / Union Parish
Weather alerts in Union Parish, Louisiana, 2021
148 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Union Parish and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 148
- Warnings
- 39
- Watches
- 18
- Advisories
- 39
- Busiest month
- March28 alerts
- Busiest day
- March 17, 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.
1 of 6 tornado warnings covering Union Parish in 2021 had a tornado report inside them; 0 of 4 tornado reports fell inside a warning.
Union Parish, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 6 | 1 | 83% | 4 | 0% | |
| Severe thunderstorm warnings | 19 | 13 | 32% | 15 | 27% | 16 min |
| Flash flood warnings | 2 | 1 | 50% | 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 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 | Lake Wind Advisory | SHV | 21 hr |
| Feb 10, 10:21 PM CST | Special Weather Statement | SHV | 39 min |
| 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, 2:27 PM CST | Winter Storm Warning | SHV | 67 hr |
| Feb 17, 10:53 AM CST | Mesoscale Discussion | SPC | 6 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, 6:50 PM CST | Mesoscale Discussion | SPC | 115 min |
| Feb 28, 5:54 PM CST | Severe Thunderstorm Watch | SPC | 4 hr |
| Feb 28, 9:01 PM CST | Mesoscale Discussion | SPC | 89 min |
| Mar 4, 10:00 AM CST | River Flood Warning | SHV | 24 hr |
| Mar 15, 11:51 PM CDT | Special Weather Statement | SHV | 24 min |
| Mar 16, 5:44 PM CDT | Special Weather Statement | SHV | 46 min |
| Mar 16, 6:40 PM CDT | Special Weather Statement | SHV | 50 min |
| 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, 8:43 AM CDT | Tornado Watch | SPC | 4 hr |
| Mar 17, 12:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Mar 17, 12:57 PM CDT | Tornado Watch | SPC | 6 hr |
| Mar 17, 2:08 PM CDT | Severe Thunderstorm Warning | SHV | 52 min |
| Mar 17, 2:16 PM CDT | Severe Thunderstorm Warning | SHV | 44 min |
| Mar 17, 2:32 PM CDT | Tornado Warning | SHV | 43 min |
| Mar 17, 2:58 PM CDT | Tornado Warning | SHV | 47 min |
| Mar 17, 3:12 PM CDT | Tornado Warning | SHV | 48 min |
| Mar 17, 3:34 PM CDT | Tornado Warning | SHV | 10 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, 10:23 PM CDT | Severe Thunderstorm Warning | SHV | 67 min |
| Mar 27, 10:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 30, 5:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Mar 30, 8:36 PM CDT | Special Weather Statement | SHV | 39 min |
| Mar 30, 8:54 PM CDT | Severe Thunderstorm Warning | SHV | 36 min |
| Mar 30, 8:59 PM CDT | Tornado Warning | SHV | 31 min |
| Mar 31, 3:27 AM CDT | Lake Wind Advisory | SHV | 16 hr |
| Mar 31, 7:16 AM CDT | Special Weather Statement | SHV | 59 min |
| Apr 1, 2:35 PM CDT | Freeze Warning | SHV | 18 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, 3:12 PM CDT | Special Weather Statement | SHV | 48 min |
| Apr 7, 3:40 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Apr 7, 6:38 PM CDT | Tornado Warning | SHV | 52 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, 3:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Apr 9, 5:01 PM CDT | Severe Thunderstorm Warning | SHV | 44 min |
| Apr 9, 5:15 PM CDT | Severe Thunderstorm Warning | SHV | 45 min |
| Apr 9, 5:19 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Apr 9, 5:32 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 9, 5:44 PM CDT | Severe Thunderstorm Warning | SHV | 46 min |
| Apr 9, 5:58 PM CDT | Severe Thunderstorm Warning | SHV | 21 min |
| Apr 9, 6:40 PM CDT | Severe Thunderstorm Warning | SHV | 65 min |
| Apr 9, 6:55 PM CDT | Severe Thunderstorm Warning | SHV | 65 min |
| Apr 9, 7:30 PM CDT | Special Weather Statement | SHV | 45 min |
| Apr 9, 7:35 PM CDT | Flash Flood Warning | SHV | 3 hr |
| Apr 10, 12:41 AM CDT | Special Weather Statement | SHV | 49 min |
| Apr 10, 12:52 AM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Apr 14, 8:29 AM CDT | Special Weather Statement | SHV | 61 min |
| Apr 23, 2:21 PM CDT | Lake Wind Advisory | SHV | 17 hr |
| May 3, 3:08 AM CDT | Lake Wind Advisory | SHV | 15 hr |
| May 4, 6:44 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 4, 10:52 AM CDT | Tornado Watch | SPC | 7 hr |
| May 4, 12:25 PM CDT | Severe Thunderstorm Warning | SHV | 65 min |
| May 4, 12:28 PM CDT | Severe Thunderstorm Warning | SHV | 47 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, 5:41 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 9, 8:14 PM CDT | Special Weather Statement | SHV | 61 min |
| May 11, 2:04 AM CDT | Flash Flood Watch | SHV | 24 hr |
| May 25, 6:12 PM CDT | Special Weather Statement | SHV | 48 min |
| May 28, 3:15 AM CDT | Severe Thunderstorm Warning | SHV | 60 min |
| Jun 7, 12:32 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 7, 3:08 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 7, 4:01 PM CDT | Severe Thunderstorm Warning | SHV | 44 min |
| Jun 7, 4:21 PM CDT | Severe Thunderstorm Warning | SHV | 54 min |
| Jun 7, 4:45 PM CDT | Severe Thunderstorm Warning | SHV | 60 min |
| Jun 7, 5:23 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jun 8, 11:17 AM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 8, 12:42 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 8, 2:05 PM CDT | Severe Thunderstorm Warning | SHV | 55 min |
| Jun 9, 12:55 PM CDT | Flash Flood Watch | SHV | 21 hr |
| Jun 10, 4:35 PM CDT | Special Weather Statement | SHV | 40 min |
| Jun 13, 3:55 PM CDT | Severe Thunderstorm Warning | SHV | 50 min |
| Jun 14, 3:06 AM CDT | Heat Advisory | SHV | 16 hr |
| Jun 26, 8:22 PM CDT | Special Weather Statement | SHV | 38 min |
| Jun 28, 4:59 PM CDT | Special Weather Statement | SHV | 61 min |
| Jul 2, 8:10 AM CDT | Flash Flood Warning | SHV | 3 hr |
| Jul 7, 7:01 PM CDT | Special Weather Statement | SHV | 44 min |
| Jul 11, 2:54 AM CDT | Special Weather Statement | SHV | 51 min |
| Jul 16, 8:44 PM CDT | Special Weather Statement | SHV | 46 min |
| Jul 18, 2:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 19, 7:02 AM CDT | Areal Flood Advisory | SHV | 3 hr |
| Jul 23, 2:33 PM CDT | Heat Advisory | SHV | 28 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 1, 7:15 PM CDT | Special Weather Statement | SHV | 30 min |
| Aug 1, 8:09 PM CDT | Areal Flood Advisory | SHV | 111 min |
| Aug 1, 8:16 PM CDT | Special Weather Statement | SHV | 29 min |
| Aug 2, 6:38 PM CDT | Areal Flood Advisory | SHV | 3 hr |
| Aug 9, 2:55 AM CDT | Heat Advisory | SHV | 16 hr |
| Aug 9, 7:04 PM CDT | Heat Advisory | SHV | 3 days |
| Aug 14, 2:40 PM CDT | Areal Flood Advisory | SHV | 3 hr |
| Aug 19, 3:29 PM CDT | Special Weather Statement | SHV | 46 min |
| Aug 21, 2:07 AM CDT | Heat Advisory | SHV | 5 days |
| Aug 22, 2:40 PM CDT | Excessive Heat Warning | SHV | 52 hr |
| Aug 26, 3:53 AM CDT | Heat Advisory | SHV | 14 hr |
| Aug 30, 3:39 AM CDT | Lake Wind Advisory | SHV | 15 hr |
| Aug 31, 3:03 PM CDT | Heat Advisory | SHV | 28 hr |
| Sep 21, 11:51 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 21, 2:47 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 1, 9:05 PM CDT | Areal Flood Advisory | SHV | 3 hr |
| Oct 27, 9:44 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 27, 12:52 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Oct 27, 3:07 PM CDT | Lake Wind Advisory | SHV | 52 hr |
| Nov 4, 2:48 PM CDT | Freeze Warning | SHV | 18 hr |
| Nov 7, 5:01 AM CST | Dense Fog Advisory | SHV | 4 hr |
| Nov 11, 1:19 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Nov 11, 1:32 AM CST | Severe Thunderstorm Warning | SHV | 58 min |
| Nov 11, 2:56 AM CST | Special Weather Statement | SHV | 34 min |
| Nov 18, 3:31 AM CST | Freeze Warning | SHV | 27 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 11, 2:00 AM CST | Mesoscale Discussion | SPC | 90 min |
| Dec 11, 2:06 AM CST | Special Weather Statement | SHV | 24 min |
| Dec 18, 3:03 AM CST | Lake Wind Advisory | SHV | 15 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, 12:05 PM CST | Tornado Watch | SPC | 7 hr |
| Dec 29, 8:50 PM CST | Special Weather Statement | SHV | 40 min |
| 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.
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.