Alert archive / Mississippi / Jefferson Davis County
Weather alerts in Jefferson Davis County, Mississippi, 2021
126 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Jefferson Davis County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 126
- Warnings
- 30
- Watches
- 24
- Advisories
- 32
- Busiest month
- March21 alerts
- Busiest day
- March 17, 20217 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 Jefferson Davis County in 2021 had a tornado report inside them; 0 of 3 tornado reports fell inside a warning.
Jefferson Davis County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 2 | 33% | 3 | 0% | |
| Severe thunderstorm warnings | 14 | 8 | 43% | 7 | 86% | 18 min |
| Flash flood warnings | 8 | 7 | 13% | 2 | 100% | 84 min |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Jackson, MS: tornado warnings | 62 | 22 | 65% | 76 | 61% | 21 min |
| NWS Jackson, MS: severe thunderstorm warnings | 296 | 169 | 43% | 530 | 86% | 28 min |
| NWS Jackson, MS: flash flood warnings | 110 | 66 | 40% | 199 | 83% | 83 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 |
|---|---|---|---|
| Dec 31, 9:31 PM CST | Mesoscale Discussion | SPC | 119 min |
| Feb 10, 2:09 PM CST | Dense Fog Advisory | JAN | 16 hr |
| Feb 11, 1:34 AM CST | Special Weather Statement | JAN | 41 min |
| Feb 11, 8:47 AM CST | Flash Flood Warning | JAN | 4 hr |
| Feb 12, 4:09 PM CST | Winter Storm Watch | JAN | 23 hr |
| Feb 13, 3:13 PM CST | Winter Storm Warning | JAN | 48 hr |
| Feb 14, 9:09 PM CST | Hard Freeze Warning | JAN | 63 hr |
| Feb 14, 9:41 PM CST | Wind Chill Advisory | JAN | 35 hr |
| Feb 15, 3:09 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 15, 9:28 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 16, 2:50 PM CST | Winter Weather Advisory | JAN | 39 hr |
| Feb 17, 10:53 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Mar 12, 2:29 PM CST | Dense Fog Advisory | JAN | 19 hr |
| Mar 16, 11:49 AM CDT | Flash Flood Watch | JAN | 7 hr |
| Mar 16, 7:32 PM CDT | Severe Thunderstorm Warning | JAN | 58 min |
| Mar 17, 10:56 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 17, 11:36 AM CDT | Tornado Watch | SPC | 7 hr |
| Mar 17, 1:19 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Mar 17, 3:33 PM CDT | Severe Thunderstorm Warning | JAN | 42 min |
| Mar 17, 5:45 PM CDT | Severe Thunderstorm Warning | JAN | 34 min |
| Mar 17, 5:49 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Mar 22, 2:27 PM CDT | Flash Flood Watch | JAN | 25 hr |
| Mar 23, 3:05 PM CDT | Flash Flood Watch | JAN | 37 hr |
| Mar 24, 12:10 PM CDT | Wind Advisory | JAN | 26 hr |
| Mar 24, 9:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Mar 25, 11:26 AM CDT | Tornado Watch | SPC | 9 hr |
| Mar 25, 1:03 PM CDT | Tornado Warning | JAN | 57 min |
| Mar 25, 1:24 PM CDT | Flash Flood Warning | JAN | 94 min |
| Mar 25, 3:16 PM CDT | Severe Thunderstorm Warning | JAN | 44 min |
| Mar 25, 3:40 PM CDT | Severe Thunderstorm Warning | JAN | 65 min |
| Mar 30, 5:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Mar 31, 10:57 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Mar 31, 11:19 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 1, 10:41 AM CDT | Freeze Watch | JAN | 17 hr |
| Apr 6, 5:15 AM CDT | Dense Fog Advisory | JAN | 4 hr |
| Apr 7, 8:52 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 9, 10:25 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 9, 11:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 9, 11:52 PM CDT | Severe Thunderstorm Warning | JAN | 38 min |
| Apr 10, 12:16 AM CDT | Tornado Watch | SPC | 7 hr |
| Apr 10, 12:31 AM CDT | Tornado Warning | JAN | 44 min |
| Apr 10, 12:53 AM CDT | Flash Flood Warning | JAN | 3 hr |
| Apr 15, 4:32 AM CDT | Severe Thunderstorm Warning | JAN | 22 min |
| Apr 15, 1:36 PM CDT | Flash Flood Watch | JAN | 39 hr |
| Apr 23, 3:22 PM CDT | Flash Flood Watch | JAN | 14 hr |
| Apr 23, 8:30 PM CDT | Tornado Watch | SPC | 8 hr |
| Apr 24, 1:43 AM CDT | Special Weather Statement | JAN | 62 min |
| Apr 24, 1:56 AM CDT | Severe Thunderstorm Warning | JAN | 64 min |
| Apr 24, 12:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 27, 2:47 AM CDT | Dense Fog Advisory | JAN | 6 hr |
| May 2, 3:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| May 4, 3:50 AM CDT | Flash Flood Watch | JAN | 18 hr |
| May 4, 8:33 AM CDT | Mesoscale Discussion | SPC | 117 min |
| May 4, 9:18 AM CDT | Tornado Watch | SPC | 7 hr |
| May 4, 2:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| May 4, 2:40 PM CDT | Severe Thunderstorm Warning | JAN | 80 min |
| May 4, 3:31 PM CDT | Tornado Watch | SPC | 6 hr |
| May 4, 3:38 PM CDT | Severe Thunderstorm Warning | JAN | 82 min |
| May 11, 3:25 AM CDT | Flash Flood Watch | JAN | 25 hr |
| May 12, 12:35 AM CDT | Special Weather Statement | JAN | 40 min |
| May 18, 3:10 PM CDT | Tornado Warning | JAN | 38 min |
| May 18, 4:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 3, 12:11 PM CDT | Special Weather Statement | JAN | 64 min |
| Jun 6, 3:01 AM CDT | Flash Flood Watch | JAN | 15 hr |
| Jun 6, 8:08 AM CDT | Flash Flood Warning | JAN | 4 hr |
| Jun 6, 9:56 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 6, 11:03 AM CDT | Flash Flood Warning | JAN | 3 hr |
| Jun 6, 12:56 PM CDT | Flash Flood Warning | JAN | 4 hr |
| Jun 9, 8:42 PM CDT | Severe Thunderstorm Warning | JAN | 63 min |
| Jun 13, 10:45 AM CDT | Mesoscale Discussion | SPC | 60 min |
| Jun 13, 12:22 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 13, 12:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 13, 4:58 PM CDT | Severe Thunderstorm Warning | JAN | 66 min |
| Jun 14, 3:04 AM CDT | Heat Advisory | JAN | 12 hr |
| Jun 14, 6:12 PM CDT | Severe Thunderstorm Warning | JAN | 48 min |
| Jun 18, 2:53 PM CDT | Wind Advisory | JAN | 18 hr |
| Jun 21, 7:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 27, 2:17 PM CDT | Special Weather Statement | JAN | 43 min |
| Jun 27, 2:45 PM CDT | Special Weather Statement | JAN | 60 min |
| Jun 28, 6:06 PM CDT | Special Weather Statement | JAN | 54 min |
| Jul 5, 4:15 PM CDT | Special Weather Statement | JAN | 60 min |
| Jul 18, 7:06 AM CDT | Dense Fog Advisory | JAN | 114 min |
| Jul 23, 2:40 PM CDT | Heat Advisory | JAN | 28 hr |
| Jul 24, 2:55 PM CDT | Heat Advisory | JAN | 28 hr |
| Jul 25, 2:32 PM CDT | Heat Advisory | JAN | 28 hr |
| Jul 26, 2:54 PM CDT | Heat Advisory | JAN | 28 hr |
| Jul 27, 2:54 PM CDT | Excessive Heat Warning | JAN | 4 days |
| Jul 27, 2:54 PM CDT | Heat Advisory | JAN | 5 days |
| Aug 1, 12:09 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 14, 9:26 PM CDT | Special Weather Statement | JAN | 34 min |
| Aug 20, 3:05 PM CDT | Heat Advisory | JAN | 3 days |
| Aug 23, 3:27 PM CDT | Heat Advisory | JAN | 28 hr |
| Aug 24, 3:01 PM CDT | Heat Advisory | JAN | 28 hr |
| Aug 27, 4:10 PM CDT | Tropical Storm Watch | JAN | 24 hr |
| Aug 28, 3:36 AM CDT | Flash Flood Watch | JAN | 66 hr |
| Aug 28, 10:00 AM CDT | Tropical Storm Warning | JAN | 54 hr |
| Aug 29, 6:07 AM CDT | Tornado Watch | SPC | 13 hr |
| Aug 29, 10:04 AM CDT | Mesoscale Discussion | SPC | 4 hr |
| Aug 29, 6:49 PM CDT | Tornado Watch | SPC | 11 hr |
| Aug 30, 2:44 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 30, 6:00 AM CDT | Flash Flood Warning | JAN | 4 hr |
| Sep 1, 4:08 AM CDT | Heat Advisory | JAN | 15 hr |
| Sep 1, 7:08 PM CDT | Severe Thunderstorm Warning | JAN | 67 min |
| Sep 1, 7:21 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Sep 28, 6:34 AM CDT | Dense Fog Advisory | JAN | 3 hr |
| Oct 4, 2:54 AM CDT | Dense Fog Advisory | JAN | 6 hr |
| Oct 4, 9:10 PM CDT | Flash Flood Warning | JAN | 2 hr |
| Oct 6, 5:50 AM CDT | Dense Fog Advisory | JAN | 3 hr |
| Oct 13, 9:41 PM CDT | Dense Fog Advisory | JAN | 12 hr |
| Oct 14, 2:56 PM CDT | Dense Fog Advisory | JAN | 18 hr |
| Oct 27, 12:50 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Oct 27, 1:53 PM CDT | Tornado Watch | SPC | 8 hr |
| Oct 27, 5:16 PM CDT | Special Weather Statement | JAN | 74 min |
| Nov 6, 2:29 AM CDT | Dense Fog Advisory | JAN | 8 hr |
| Nov 11, 9:29 PM CST | Dense Fog Advisory | JAN | 12 hr |
| Nov 13, 3:17 AM CST | Freeze Warning | JAN | 29 hr |
| Nov 18, 4:24 AM CST | Dense Fog Advisory | JAN | 5 hr |
| Dec 2, 2:51 AM CST | Dense Fog Advisory | JAN | 6 hr |
| Dec 2, 8:58 PM CST | Dense Fog Advisory | JAN | 13 hr |
| Dec 4, 3:02 PM CST | Dense Fog Advisory | JAN | 18 hr |
| Dec 6, 10:06 AM CST | Mesoscale Discussion | SPC | 114 min |
| Dec 15, 3:22 AM CST | Dense Fog Advisory | JAN | 6 hr |
| Dec 16, 3:20 PM CST | Dense Fog Advisory | JAN | 16 hr |
| Dec 18, 5:59 PM CST | Special Weather Statement | JAN | 31 min |
| Dec 28, 1:18 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Dec 29, 2:03 PM CST | Mesoscale Discussion | SPC | 87 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 | |
| Severe Thunderstorm Warning | 14 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 9 |
| Mesoscale Discussion | 29 |
| Special Weather Statement | 11 |
| Flooding | |
| Flash Flood Warning | 8 |
| Flash Flood Watch | 9 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 1 |
| Heat | |
| Excessive Heat Warning | 1 |
| Heat Advisory | 10 |
| Cold | |
| Freeze Warning | 1 |
| Hard Freeze Warning | 1 |
| Freeze Watch | 1 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 18 |
| Tropical | |
| Tropical Storm Warning | 1 |
| Tropical Storm Watch | 1 |
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.