Alert archive / Mississippi / Jefferson County
Weather alerts in Jefferson County, Mississippi, 2012
130 weather alerts in 2012, 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 2012. Tap one for its archive.
- Alerts
- 130
- Warnings
- 33
- Watches
- 29
- Advisories
- 15
- Busiest month
- December20 alerts
- Busiest day
- December 25, 20128 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 2 tornado warnings covering Jefferson County in 2012 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.
Jefferson County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 1 | 0% | |
| Severe thunderstorm warnings | 22 | 14 | 36% | 6 | 100% | 14 min |
| Flash flood warnings | 8 | 3 | 63% | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Jackson, MS: tornado warnings | 102 | 24 | 76% | 59 | 75% | 14 min |
| NWS Jackson, MS: severe thunderstorm warnings | 665 | 382 | 43% | 872 | 85% | 25 min |
| NWS Jackson, MS: flash flood warnings | 158 | 71 | 55% | 160 | 84% | 93 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, 5:04 AM CST | Dense Fog Advisory | JAN | 5 hr |
| Jan 10, 4:08 PM CST | Mesoscale Discussion | SPC | 82 min |
| Jan 12, 3:47 AM CST | Wind Advisory | JAN | 14 hr |
| Jan 17, 9:26 AM CST | Mesoscale Discussion | SPC | 34 min |
| Jan 17, 3:45 PM CST | Mesoscale Discussion | SPC | 60 min |
| Jan 22, 9:47 PM CST | Mesoscale Discussion | SPC | 58 min |
| Jan 22, 10:59 PM CST | Tornado Watch | SPC | 7 hr |
| Jan 23, 1:25 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 25, 2:08 PM CST | Tornado Watch | SPC | 7 hr |
| Jan 25, 4:49 PM CST | Mesoscale Discussion | SPC | 86 min |
| Feb 3, 2:12 PM CST | Severe Thunderstorm Warning | JAN | 63 min |
| Feb 3, 2:58 PM CST | Special Weather Statement | JAN | 47 min |
| Feb 4, 2:34 AM CST | Flash Flood Watch | JAN | 12 hr |
| Feb 15, 6:04 PM CST | Special Weather Statement | JAN | 56 min |
| Feb 15, 8:06 PM CST | Flash Flood Warning | JAN | 114 min |
| Feb 17, 2:17 PM CST | Flash Flood Watch | JAN | 30 hr |
| Feb 18, 1:50 PM CST | Special Weather Statement | JAN | 25 min |
| Feb 23, 4:55 AM CST | Wind Advisory | JAN | 14 hr |
| Mar 2, 1:47 PM CST | Severe Thunderstorm Watch | SPC | 9 hr |
| Mar 2, 7:18 PM CST | Mesoscale Discussion | SPC | 57 min |
| Mar 11, 6:42 PM CDT | Tornado Watch | SPC | 8 hr |
| Mar 11, 8:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Mar 19, 3:00 PM CDT | Wind Advisory | JAN | 28 hr |
| Mar 20, 4:36 AM CDT | Flash Flood Watch | JAN | 47 hr |
| Mar 21, 5:04 AM CDT | Tornado Watch | SPC | 7 hr |
| Mar 21, 9:25 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Mar 21, 10:07 AM CDT | Tornado Watch | SPC | 8 hr |
| Mar 21, 10:10 AM CDT | Special Weather Statement | JAN | 60 min |
| Mar 21, 10:18 AM CDT | Severe Thunderstorm Warning | JAN | 42 min |
| Mar 21, 10:24 AM CDT | Tornado Warning | JAN | 27 min |
| Mar 21, 10:29 AM CDT | Tornado Warning | JAN | 40 min |
| Mar 23, 7:04 AM CDT | Dense Fog Advisory | JAN | 3 hr |
| Apr 2, 12:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Apr 2, 12:50 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 2, 2:15 PM CDT | Severe Thunderstorm Warning | JAN | 60 min |
| Apr 2, 3:05 PM CDT | Severe Thunderstorm Warning | JAN | 55 min |
| Apr 2, 3:10 PM CDT | Flash Flood Warning | JAN | 2 hr |
| Apr 2, 3:23 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 3, 2:22 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Apr 3, 5:24 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Apr 3, 5:59 PM CDT | Special Weather Statement | JAN | 46 min |
| Apr 3, 6:46 PM CDT | Severe Thunderstorm Warning | JAN | 34 min |
| Apr 5, 1:35 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Apr 5, 1:53 AM CDT | Tornado Watch | SPC | 9 hr |
| Apr 5, 3:30 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 5, 7:36 AM CDT | Mesoscale Discussion | SPC | 54 min |
| Apr 21, 12:33 AM CDT | Special Weather Statement | JAN | 32 min |
| Apr 21, 12:40 AM CDT | Severe Thunderstorm Warning | JAN | 65 min |
| May 2, 3:22 PM CDT | Special Weather Statement | JAN | 28 min |
| May 7, 1:07 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 7, 2:40 PM CDT | Special Weather Statement | JAN | 60 min |
| May 7, 3:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| May 21, 2:12 PM CDT | Special Weather Statement | JAN | 28 min |
| May 21, 2:33 PM CDT | Flash Flood Warning | JAN | 117 min |
| May 21, 3:17 PM CDT | Severe Thunderstorm Warning | JAN | 43 min |
| May 21, 4:35 PM CDT | Mesoscale Discussion | SPC | 55 min |
| May 30, 12:07 PM CDT | Mesoscale Discussion | SPC | 83 min |
| May 31, 10:41 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 31, 1:53 PM CDT | Mesoscale Discussion | SPC | 67 min |
| May 31, 2:13 PM CDT | Severe Thunderstorm Warning | JAN | 62 min |
| Jun 11, 8:37 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 11, 9:58 PM CDT | Severe Thunderstorm Warning | JAN | 62 min |
| Jun 11, 10:51 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jun 12, 7:11 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 12, 7:15 AM CDT | Severe Thunderstorm Warning | JAN | 30 min |
| Jun 29, 3:44 AM CDT | Heat Advisory | JAN | 66 hr |
| Jul 3, 3:24 PM CDT | Special Weather Statement | JAN | 31 min |
| Jul 4, 3:46 PM CDT | Severe Thunderstorm Warning | JAN | 29 min |
| Jul 4, 4:24 PM CDT | Severe Thunderstorm Warning | JAN | 38 min |
| Jul 7, 4:15 PM CDT | Severe Thunderstorm Warning | JAN | 30 min |
| Jul 7, 4:48 PM CDT | Special Weather Statement | JAN | 27 min |
| Jul 11, 11:51 AM CDT | Special Weather Statement | JAN | 59 min |
| Jul 12, 2:48 PM CDT | Special Weather Statement | JAN | 57 min |
| Jul 19, 6:58 PM CDT | Flash Flood Warning | JAN | 2 hr |
| Jul 20, 12:47 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 8:25 AM CDT | Flash Flood Warning | JAN | 3 hr |
| Jul 29, 3:53 AM CDT | Heat Advisory | JAN | 4 days |
| Aug 10, 4:20 PM CDT | Severe Thunderstorm Warning | JAN | 55 min |
| Aug 10, 5:42 PM CDT | Severe Thunderstorm Warning | JAN | 63 min |
| Aug 10, 6:22 PM CDT | Flash Flood Warning | JAN | 79 min |
| Aug 10, 6:25 PM CDT | Severe Thunderstorm Warning | JAN | 37 min |
| Aug 18, 1:37 PM CDT | Special Weather Statement | JAN | 58 min |
| Aug 27, 4:58 AM CDT | Tropical Storm Watch | JAN | 61 hr |
| Aug 27, 4:32 PM CDT | Flash Flood Watch | JAN | 3 days |
| Aug 27, 4:59 PM CDT | Tropical Storm Warning | JAN | 3 days |
| Aug 29, 3:17 PM CDT | Mesoscale Discussion | SPC | 28 min |
| Aug 29, 3:53 PM CDT | Tornado Watch | SPC | 8 hr |
| Aug 29, 8:21 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 29, 11:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 29, 11:42 PM CDT | Tornado Watch | SPC | 8 hr |
| Aug 30, 3:56 PM CDT | Tornado Watch | SPC | 6 hr |
| Aug 30, 8:35 PM CDT | Flash Flood Watch | JAN | 4 hr |
| Aug 30, 9:05 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Aug 31, 3:11 PM CDT | Special Weather Statement | JAN | 39 min |
| Sep 3, 3:32 AM CDT | Heat Advisory | JAN | 5 days |
| Sep 29, 4:02 AM CDT | Flash Flood Watch | JAN | 45 hr |
| Sep 29, 1:00 PM CDT | Special Weather Statement | JAN | 55 min |
| Sep 30, 5:50 PM CDT | Tornado Watch | SPC | 8 hr |
| Oct 6, 3:00 AM CDT | Special Weather Statement | JAN | 70 min |
| Oct 17, 6:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Oct 17, 7:01 PM CDT | Tornado Watch | SPC | 8 hr |
| Oct 17, 9:28 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Oct 17, 11:49 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Oct 18, 1:02 AM CDT | Severe Thunderstorm Warning | JAN | 58 min |
| Oct 18, 1:49 AM CDT | Severe Thunderstorm Warning | JAN | 56 min |
| Oct 24, 4:11 AM CDT | Dense Fog Advisory | JAN | 6 hr |
| Oct 25, 3:24 AM CDT | Dense Fog Advisory | JAN | 7 hr |
| Nov 3, 5:18 AM CDT | Dense Fog Advisory | JAN | 5 hr |
| Nov 12, 12:38 AM CST | Special Weather Statement | JAN | 37 min |
| Nov 26, 10:14 PM CST | Mesoscale Discussion | SPC | 3 hr |
| Dec 2, 1:52 PM CST | Dense Fog Advisory | JAN | 20 hr |
| Dec 8, 4:03 AM CST | Dense Fog Advisory | JAN | 6 hr |
| Dec 9, 9:59 PM CST | Mesoscale Discussion | SPC | 61 min |
| Dec 10, 4:07 AM CST | Mesoscale Discussion | SPC | 113 min |
| Dec 10, 5:23 AM CST | Severe Thunderstorm Warning | JAN | 37 min |
| Dec 16, 5:00 AM CST | Mesoscale Discussion | SPC | 90 min |
| Dec 16, 9:54 AM CST | Mesoscale Discussion | SPC | 96 min |
| Dec 19, 9:53 AM CST | Wind Advisory | JAN | 32 hr |
| Dec 20, 1:07 AM CST | Severe Thunderstorm Watch | SPC | 5 hr |
| Dec 20, 4:08 AM CST | Mesoscale Discussion | SPC | 67 min |
| Dec 20, 4:34 AM CST | Severe Thunderstorm Warning | JAN | 71 min |
| Dec 25, 5:03 AM CST | Wind Advisory | JAN | 25 hr |
| Dec 25, 10:17 AM CST | Flash Flood Watch | JAN | 9 hr |
| Dec 25, 11:50 AM CST | Flash Flood Warning | JAN | 4 hr |
| Dec 25, 12:19 PM CST | Mesoscale Discussion | SPC | 71 min |
| Dec 25, 12:58 PM CST | Tornado Watch | SPC | 9 hr |
| Dec 25, 1:49 PM CST | Severe Thunderstorm Warning | JAN | 41 min |
| Dec 25, 2:02 PM CST | Severe Thunderstorm Warning | JAN | 43 min |
| Dec 25, 2:55 PM CST | Flash Flood Warning | JAN | 2 hr |
| Dec 28, 9:02 AM CST | Flash Flood Watch | JAN | 11 hr |
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 | 22 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 8 |
| Tornado Watch | 12 |
| Mesoscale Discussion | 35 |
| Special Weather Statement | 18 |
| Flooding | |
| Flash Flood Warning | 8 |
| Flash Flood Watch | 8 |
| Heat | |
| Heat Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fog and smoke | |
| Dense Fog Advisory | 7 |
| 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 archive20112013
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.