Alert archive / Mississippi / Jefferson County
Weather alerts in Jefferson County, Mississippi, 2019
121 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Jefferson County and its neighbors
Each county as a circle sized by its count in 2019. Tap one for its archive.
- Alerts
- 121
- Warnings
- 39
- Watches
- 23
- Advisories
- 25
- Busiest month
- April24 alerts
- Busiest day
- January 19, 20197 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 3 tornado warnings covering Jefferson County in 2019 had a tornado report inside them; 1 of 3 tornado reports fell inside a warning, on average 0 minutes after it went out.
Jefferson County, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 1 | 67% | 3 | 33% | 0 min |
| Severe thunderstorm warnings | 26 | 20 | 23% | 8 | 100% | 18 min |
| Flash flood warnings | 2 | 1 | 50% | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Jackson, MS: tornado warnings | 122 | 50 | 59% | 184 | 84% | 23 min |
| NWS Jackson, MS: severe thunderstorm warnings | 404 | 246 | 39% | 711 | 74% | 26 min |
| NWS Jackson, MS: flash flood warnings | 117 | 78 | 33% | 278 | 81% | 88 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 1, 12:15 PM CST | River Flood Warning | JAN | 22 days |
| Jan 1, 4:06 PM CST | Flash Flood Watch | JAN | 55 hr |
| Jan 5, 2:02 PM CST | Dense Fog Advisory | JAN | 17 hr |
| Jan 17, 9:10 PM CST | Dense Fog Advisory | JAN | 12 hr |
| Jan 19, 1:24 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 19, 4:27 AM CST | Severe Thunderstorm Warning | JAN | 48 min |
| Jan 19, 5:04 AM CST | Mesoscale Discussion | SPC | 116 min |
| Jan 19, 5:10 AM CST | Severe Thunderstorm Warning | JAN | 50 min |
| Jan 19, 5:23 AM CST | Tornado Watch | SPC | 8 hr |
| Jan 19, 6:05 AM CST | Severe Thunderstorm Warning | JAN | 40 min |
| Jan 19, 6:37 AM CST | Severe Thunderstorm Warning | JAN | 38 min |
| Jan 27, 3:51 PM CST | Winter Storm Watch | JAN | 12 hr |
| Jan 28, 3:51 AM CST | Winter Storm Warning | JAN | 24 hr |
| Jan 28, 3:51 AM CST | Winter Weather Advisory | JAN | 27 hr |
| Feb 3, 4:03 AM CST | Dense Fog Advisory | JAN | 6 hr |
| Feb 4, 3:42 PM CST | Dense Fog Advisory | JAN | 16 hr |
| Feb 8, 12:00 PM CST | River Flood Warning | JAN | 170 days |
| Feb 20, 6:29 AM CST | Mesoscale Discussion | SPC | 3 hr |
| Feb 22, 3:20 PM CST | Wind Advisory | JAN | 33 hr |
| Feb 23, 10:52 AM CST | Mesoscale Discussion | SPC | 113 min |
| Feb 23, 12:26 PM CST | Tornado Watch | SPC | 8 hr |
| Feb 23, 2:41 PM CST | Severe Thunderstorm Warning | JAN | 64 min |
| Mar 4, 3:50 AM CST | Freeze Warning | JAN | 30 hr |
| Mar 5, 3:10 AM CST | Freeze Warning | JAN | 31 hr |
| Mar 12, 3:25 PM CDT | Wind Advisory | JAN | 49 hr |
| Apr 7, 3:41 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 7, 6:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 7, 7:25 PM CDT | Severe Thunderstorm Warning | JAN | 50 min |
| Apr 7, 7:46 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Apr 7, 8:02 PM CDT | Severe Thunderstorm Warning | JAN | 58 min |
| Apr 12, 3:20 AM CDT | Mesoscale Discussion | SPC | 55 min |
| Apr 12, 3:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 12, 10:33 PM CDT | Special Weather Statement | JAN | 42 min |
| Apr 12, 10:51 PM CDT | Severe Thunderstorm Warning | JAN | 39 min |
| Apr 13, 3:19 AM CDT | Wind Advisory | JAN | 19 hr |
| Apr 13, 12:53 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 13, 2:20 PM CDT | Tornado Watch | SPC | 10 hr |
| Apr 13, 3:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Apr 13, 8:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Apr 17, 2:59 PM CDT | Flash Flood Watch | JAN | 28 hr |
| Apr 18, 9:50 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Apr 18, 10:35 AM CDT | Tornado Watch | SPC | 8 hr |
| Apr 18, 12:30 PM CDT | Severe Thunderstorm Warning | JAN | 60 min |
| Apr 18, 1:01 PM CDT | Severe Thunderstorm Warning | JAN | 74 min |
| Apr 18, 1:13 PM CDT | Tornado Warning | JAN | 46 min |
| Apr 25, 2:43 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 25, 5:02 AM CDT | Mesoscale Discussion | SPC | 58 min |
| Apr 25, 6:48 AM CDT | Severe Thunderstorm Warning | JAN | 57 min |
| Apr 25, 7:23 AM CDT | Severe Thunderstorm Warning | JAN | 51 min |
| May 8, 3:49 AM CDT | Flash Flood Watch | JAN | 4 days |
| May 8, 3:48 PM CDT | Mesoscale Discussion | SPC | 117 min |
| May 8, 6:45 PM CDT | Tornado Watch | SPC | 5 hr |
| May 8, 7:34 PM CDT | Severe Thunderstorm Warning | JAN | 71 min |
| May 9, 8:09 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 9, 8:56 AM CDT | Tornado Warning | JAN | 64 min |
| May 19, 1:02 AM CDT | Mesoscale Discussion | SPC | 58 min |
| May 19, 1:47 AM CDT | Tornado Watch | SPC | 9 hr |
| May 19, 3:46 AM CDT | Severe Thunderstorm Warning | JAN | 59 min |
| May 19, 4:05 AM CDT | Tornado Warning | JAN | 40 min |
| May 19, 4:41 AM CDT | Severe Thunderstorm Warning | JAN | 50 min |
| Jun 6, 3:35 AM CDT | Flash Flood Watch | JAN | 12 hr |
| Jun 17, 12:29 PM CDT | Special Weather Statement | JAN | 46 min |
| Jun 17, 12:36 PM CDT | Severe Thunderstorm Warning | JAN | 54 min |
| Jun 17, 1:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jun 19, 11:02 AM CDT | Special Weather Statement | JAN | 58 min |
| Jun 19, 10:24 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 20, 3:08 AM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 21, 3:33 AM CDT | Heat Advisory | JAN | 15 hr |
| Jun 22, 4:20 AM CDT | Heat Advisory | JAN | 15 hr |
| Jun 23, 1:50 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jun 24, 3:34 AM CDT | Special Weather Statement | JAN | 56 min |
| Jun 24, 3:51 AM CDT | Severe Thunderstorm Warning | JAN | 69 min |
| Jun 24, 4:18 AM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 27, 6:48 PM CDT | Severe Thunderstorm Warning | JAN | 42 min |
| Jun 28, 1:53 PM CDT | Severe Thunderstorm Warning | JAN | 38 min |
| Jun 28, 2:11 PM CDT | Special Weather Statement | JAN | 34 min |
| Jun 28, 2:18 PM CDT | Severe Thunderstorm Warning | JAN | 32 min |
| Jul 2, 4:15 PM CDT | Special Weather Statement | JAN | 30 min |
| Jul 7, 12:48 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jul 8, 3:43 PM CDT | Heat Advisory | JAN | 27 hr |
| Jul 9, 3:07 PM CDT | Heat Advisory | JAN | 28 hr |
| Jul 10, 3:40 PM CDT | Heat Advisory | JAN | 27 hr |
| Jul 11, 2:22 PM CDT | Flash Flood Watch | JAN | 4 days |
| Jul 13, 4:38 AM CDT | Wind Advisory | JAN | 29 hr |
| Jul 14, 9:45 AM CDT | Tornado Watch | SPC | 9 hr |
| Jul 14, 12:12 PM CDT | Severe Thunderstorm Warning | JAN | 48 min |
| Jul 14, 2:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 4:29 AM CDT | Flash Flood Warning | JAN | 3 hr |
| Jul 15, 7:31 AM CDT | Flash Flood Warning | JAN | 119 min |
| Aug 1, 12:15 PM CDT | Special Weather Statement | JAN | 45 min |
| Aug 6, 3:01 PM CDT | Heat Advisory | JAN | 28 hr |
| Aug 7, 3:33 PM CDT | Heat Advisory | JAN | 51 hr |
| Aug 10, 3:50 AM CDT | Heat Advisory | JAN | 71 hr |
| Aug 11, 3:57 AM CDT | Excessive Heat Warning | JAN | 64 hr |
| Aug 13, 3:13 PM CDT | Heat Advisory | JAN | 28 hr |
| Sep 6, 3:28 PM CDT | Heat Advisory | JAN | 28 hr |
| Sep 8, 3:21 AM CDT | Heat Advisory | JAN | 15 hr |
| Oct 21, 4:57 AM CDT | Mesoscale Discussion | SPC | 63 min |
| Oct 21, 8:59 AM CDT | Mesoscale Discussion | SPC | 91 min |
| Oct 24, 2:53 PM CDT | Flash Flood Watch | JAN | 46 hr |
| Nov 7, 6:38 AM CST | Dense Fog Advisory | JAN | 2 hr |
| Nov 8, 3:32 AM CST | Freeze Warning | JAN | 28 hr |
| Nov 11, 3:36 AM CST | Freeze Watch | JAN | 7 hr |
| Nov 11, 3:36 AM CST | Wind Advisory | JAN | 38 hr |
| Nov 11, 10:51 AM CST | Freeze Warning | JAN | 47 hr |
| Nov 26, 9:43 PM CST | Mesoscale Discussion | SPC | 92 min |
| Nov 26, 10:18 PM CST | Severe Thunderstorm Warning | JAN | 42 min |
| Nov 30, 3:54 PM CST | Tornado Watch | SPC | 7 hr |
| Nov 30, 9:16 PM CST | Mesoscale Discussion | SPC | 119 min |
| Dec 13, 4:15 AM CST | Dense Fog Advisory | JAN | 5 hr |
| Dec 13, 9:40 PM CST | Dense Fog Advisory | JAN | 11 hr |
| Dec 14, 8:04 PM CST | Dense Fog Advisory | JAN | 13 hr |
| Dec 16, 9:43 AM CST | Mesoscale Discussion | SPC | 3 hr |
| Dec 16, 10:40 AM CST | Tornado Watch | SPC | 9 hr |
| Dec 16, 1:16 PM CST | Mesoscale Discussion | SPC | 89 min |
| Dec 16, 2:20 PM CST | Severe Thunderstorm Warning | JAN | 17 min |
| Dec 16, 4:57 PM CST | Severe Thunderstorm Warning | JAN | 44 min |
| Dec 29, 12:58 PM CST | Mesoscale Discussion | SPC | 3 hr |
| Dec 29, 2:16 PM CST | Severe Thunderstorm Warning | JAN | 44 min |
| Dec 29, 2:56 PM CST | Tornado Watch | SPC | 6 hr |
| Dec 29, 3:03 PM CST | Severe Thunderstorm Warning | JAN | 42 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 | 26 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 10 |
| Mesoscale Discussion | 27 |
| Special Weather Statement | 7 |
| Flooding | |
| Flash Flood Warning | 2 |
| River Flood Warning | 2 |
| Flash Flood Watch | 6 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 1 |
| Heat | |
| Excessive Heat Warning | 1 |
| Heat Advisory | 11 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 1 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20182020
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.