Alert archive / Mississippi / Jefferson County
Weather alerts in Jefferson County, Mississippi, 2011
148 weather alerts in 2011, 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 2011. Tap one for its archive.
- Alerts
- 148
- Warnings
- 36
- Watches
- 28
- Advisories
- 23
- Busiest month
- April35 alerts
- Busiest day
- April 15, 201111 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 Jefferson County in 2011 had a tornado report inside them.
Jefferson County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 21 | 14 | 33% | 9 | 89% | 32 min |
| Flash flood warnings | 3 | 3 | 0% | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Jackson, MS: tornado warnings | 225 | 65 | 71% | 184 | 85% | 26 min |
| NWS Jackson, MS: severe thunderstorm warnings | 717 | 416 | 42% | 1,089 | 75% | 24 min |
| NWS Jackson, MS: flash flood warnings | 164 | 99 | 40% | 205 | 93% | 110 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, 10:46 PM CST | Tornado Watch | SPC | 5 hr |
| Jan 5, 10:53 PM CST | Dense Fog Advisory | JAN | 11 hr |
| Jan 7, 3:30 PM CST | Winter Storm Watch | JAN | 45 hr |
| Jan 8, 3:01 PM CST | Winter Storm Warning | JAN | 37 hr |
| Jan 9, 12:45 PM CST | Winter Weather Advisory | JAN | 23 hr |
| Jan 31, 2:38 PM CST | Wind Advisory | JAN | 29 hr |
| Feb 1, 6:46 AM CST | Mesoscale Discussion | SPC | 119 min |
| Feb 1, 8:40 AM CST | Tornado Watch | SPC | 6 hr |
| Feb 1, 11:31 AM CST | Severe Thunderstorm Warning | JAN | 44 min |
| Feb 1, 12:00 PM CST | Mesoscale Discussion | SPC | 60 min |
| Feb 2, 3:54 PM CST | Winter Storm Watch | JAN | 25 hr |
| Feb 2, 5:40 PM CST | Hard Freeze Warning | JAN | 18 hr |
| Feb 3, 4:39 AM CST | Winter Storm Warning | JAN | 31 hr |
| Feb 3, 12:58 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 3, 10:36 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 4, 5:28 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 9, 5:28 AM CST | Winter Weather Advisory | JAN | 22 hr |
| Feb 27, 4:06 AM CST | Wind Advisory | JAN | 26 hr |
| Mar 1, 4:50 PM CST | River Flood Advisory | JAN | 6 days |
| Mar 7, 12:44 PM CST | River Flood Advisory | JAN | 10 days |
| Mar 7, 6:02 PM CST | Flash Flood Watch | JAN | 41 hr |
| Mar 8, 9:52 AM CST | Mesoscale Discussion | SPC | 53 min |
| Mar 8, 12:54 PM CST | Mesoscale Discussion | SPC | 36 min |
| Mar 8, 1:08 PM CST | Tornado Watch | SPC | 9 hr |
| Mar 8, 5:46 PM CST | Mesoscale Discussion | SPC | 59 min |
| Mar 8, 7:37 PM CST | Tornado Watch | SPC | 7 hr |
| Mar 8, 9:40 PM CST | Mesoscale Discussion | SPC | 65 min |
| Mar 8, 11:32 PM CST | Severe Thunderstorm Warning | JAN | 73 min |
| Mar 9, 12:18 AM CST | Flash Flood Warning | JAN | 3 hr |
| Mar 9, 12:40 AM CST | Severe Thunderstorm Warning | JAN | 65 min |
| Mar 9, 1:28 AM CST | Mesoscale Discussion | SPC | 92 min |
| Mar 9, 3:09 AM CST | Flash Flood Warning | JAN | 2 hr |
| Mar 9, 6:28 AM CST | Mesoscale Discussion | SPC | 92 min |
| Mar 14, 12:49 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Mar 15, 1:47 PM CDT | River Flood Warning | JAN | 18 days |
| Mar 29, 4:19 AM CDT | Flash Flood Watch | JAN | 26 hr |
| Mar 29, 3:17 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 29, 6:26 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Mar 29, 6:47 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Mar 29, 11:39 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 30, 1:01 AM CDT | Severe Thunderstorm Warning | JAN | 15 min |
| Mar 30, 4:34 AM CDT | Severe Thunderstorm Warning | JAN | 29 min |
| Apr 4, 12:05 AM CDT | Wind Advisory | JAN | 22 hr |
| Apr 4, 10:53 AM CDT | Tornado Watch | SPC | 7 hr |
| Apr 4, 2:52 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Apr 4, 3:58 PM CDT | Severe Thunderstorm Warning | JAN | 62 min |
| Apr 4, 4:39 PM CDT | Severe Thunderstorm Warning | JAN | 66 min |
| Apr 11, 2:41 PM CDT | Special Weather Statement | JAN | 59 min |
| Apr 11, 3:56 PM CDT | Mesoscale Discussion | SPC | 34 min |
| Apr 12, 2:05 PM CDT | River Flood Advisory | JAN | 8 days |
| Apr 15, 2:19 AM CDT | Tornado Watch | SPC | 8 hr |
| Apr 15, 4:21 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Apr 15, 7:32 AM CDT | Tornado Watch | SPC | 7 hr |
| Apr 15, 10:21 AM CDT | Severe Thunderstorm Warning | JAN | 15 min |
| Apr 15, 10:28 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 15, 1:26 PM CDT | Severe Thunderstorm Warning | JAN | 64 min |
| Apr 15, 1:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 15, 2:17 PM CDT | Severe Thunderstorm Warning | JAN | 58 min |
| Apr 15, 2:41 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 15, 3:15 PM CDT | Tornado Warning | JAN | 60 min |
| Apr 15, 3:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Apr 20, 11:37 AM CDT | River Flood Warning | JAN | 58 days |
| Apr 21, 10:00 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Apr 26, 3:22 AM CDT | Special Weather Statement | JAN | 38 min |
| Apr 26, 4:04 AM CDT | Special Weather Statement | JAN | 31 min |
| Apr 26, 4:18 AM CDT | Severe Thunderstorm Warning | JAN | 42 min |
| Apr 26, 1:48 PM CDT | Wind Advisory | JAN | 29 hr |
| Apr 26, 11:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Apr 27, 1:58 AM CDT | Tornado Warning | JAN | 47 min |
| Apr 27, 2:26 AM CDT | Tornado Watch | SPC | 6 hr |
| Apr 27, 2:42 AM CDT | Severe Thunderstorm Warning | JAN | 48 min |
| Apr 27, 3:14 AM CDT | Severe Thunderstorm Warning | JAN | 61 min |
| Apr 27, 3:30 AM CDT | Severe Thunderstorm Warning | JAN | 45 min |
| Apr 27, 10:45 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Apr 27, 11:02 AM CDT | Tornado Watch | SPC | 8 hr |
| Apr 27, 1:34 PM CDT | Severe Thunderstorm Warning | JAN | 56 min |
| Apr 27, 2:03 PM CDT | Tornado Warning | JAN | 42 min |
| May 2, 1:51 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 25, 9:43 PM CDT | Tornado Watch | SPC | 5 hr |
| Jun 2, 2:48 PM CDT | Heat Advisory | JAN | 3 days |
| Jun 2, 5:18 PM CDT | Special Weather Statement | JAN | 32 min |
| Jun 3, 5:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 3, 6:52 PM CDT | Special Weather Statement | JAN | 18 min |
| Jun 3, 7:04 PM CDT | Severe Thunderstorm Warning | JAN | 41 min |
| Jun 4, 6:03 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 5, 6:13 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 7, 2:41 PM CDT | Severe Thunderstorm Warning | JAN | 49 min |
| Jun 7, 3:36 PM CDT | Severe Thunderstorm Warning | JAN | 54 min |
| Jun 7, 3:47 PM CDT | Severe Thunderstorm Warning | JAN | 58 min |
| Jun 7, 6:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 8, 6:05 PM CDT | Severe Thunderstorm Warning | JAN | 28 min |
| Jun 8, 6:31 PM CDT | Special Weather Statement | JAN | 29 min |
| Jun 8, 7:00 PM CDT | Special Weather Statement | JAN | 30 min |
| Jun 13, 1:32 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 13, 2:45 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 13, 5:59 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Jun 17, 2:39 PM CDT | Heat Advisory | JAN | 3 days |
| Jun 19, 10:11 AM CDT | Excessive Heat Warning | JAN | 18 hr |
| Jun 20, 2:49 PM CDT | Special Weather Statement | JAN | 46 min |
| Jun 21, 11:58 AM CDT | Mesoscale Discussion | SPC | 62 min |
| Jun 21, 2:01 PM CDT | Special Weather Statement | JAN | 59 min |
| Jun 28, 9:52 AM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 28, 10:26 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 28, 3:19 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 30, 2:28 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 9, 4:39 AM CDT | Heat Advisory | JAN | 6 days |
| Jul 12, 3:04 PM CDT | Severe Thunderstorm Warning | JAN | 41 min |
| Jul 25, 5:33 AM CDT | Flash Flood Watch | JAN | 12 hr |
| Jul 27, 7:13 PM CDT | Special Weather Statement | JAN | 32 min |
| Jul 31, 4:00 AM CDT | Heat Advisory | JAN | 72 hr |
| Aug 1, 3:53 AM CDT | Excessive Heat Warning | JAN | 5 days |
| Aug 3, 2:49 PM CDT | Heat Advisory | JAN | 8 days |
| Aug 12, 2:05 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Aug 12, 6:15 PM CDT | Special Weather Statement | JAN | 30 min |
| Aug 13, 1:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 18, 1:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Aug 18, 4:24 PM CDT | Heat Advisory | JAN | 3 days |
| Aug 22, 3:13 AM CDT | Heat Advisory | JAN | 4 days |
| Aug 22, 4:52 PM CDT | Special Weather Statement | JAN | 38 min |
| Aug 23, 4:40 PM CDT | Mesoscale Discussion | SPC | 35 min |
| Sep 2, 3:11 PM CDT | Flash Flood Watch | JAN | 3 days |
| Sep 3, 3:57 PM CDT | Wind Advisory | JAN | 52 hr |
| Sep 4, 5:05 AM CDT | Tornado Watch | SPC | 11 hr |
| Sep 4, 9:50 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Sep 4, 3:47 PM CDT | Tornado Watch | SPC | 6 hr |
| Sep 4, 10:21 PM CDT | Flash Flood Warning | JAN | 3 hr |
| Sep 29, 3:59 AM CDT | Dense Fog Advisory | JAN | 5 hr |
| Oct 12, 1:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Oct 20, 4:54 PM CDT | Freeze Warning | JAN | 15 hr |
| Oct 28, 2:46 PM CDT | Freeze Watch | JAN | 27 hr |
| Nov 10, 4:08 AM CST | Freeze Warning | JAN | 28 hr |
| Nov 15, 5:56 PM CST | Tornado Watch | SPC | 7 hr |
| Nov 15, 8:59 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Nov 20, 10:08 PM CST | Dense Fog Advisory | JAN | 11 hr |
| Nov 22, 10:26 AM CST | Mesoscale Discussion | SPC | 94 min |
| Nov 22, 10:47 AM CST | Special Weather Statement | JAN | 28 min |
| Nov 26, 3:44 PM CST | Mesoscale Discussion | SPC | 91 min |
| Nov 26, 5:54 PM CST | Special Weather Statement | JAN | 31 min |
| Nov 26, 6:04 PM CST | Mesoscale Discussion | SPC | 56 min |
| Nov 26, 6:35 PM CST | Special Weather Statement | JAN | 30 min |
| Dec 2, 1:33 PM CST | River Flood Advisory | JAN | 20 days |
| Dec 12, 2:36 PM CST | Dense Fog Advisory | JAN | 12 hr |
| Dec 20, 11:25 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Dec 22, 4:11 AM CST | Mesoscale Discussion | SPC | 34 min |
| Dec 22, 4:36 AM CST | Tornado Watch | SPC | 7 hr |
| Dec 22, 5:09 AM CST | Flash Flood Watch | JAN | 7 hr |
| Dec 22, 11:56 AM CST | River Flood Advisory | JAN | 10 min |
| Dec 25, 2:43 PM CST | Flood Watch | JAN | 31 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 | 21 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 16 |
| Mesoscale Discussion | 46 |
| Special Weather Statement | 15 |
| Flooding | |
| Flash Flood Warning | 3 |
| River Flood Warning | 2 |
| Flash Flood Watch | 5 |
| Flood Watch | 1 |
| River Flood Advisory | 5 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 2 |
| Heat | |
| Excessive Heat Warning | 2 |
| Heat Advisory | 7 |
| Cold | |
| Freeze Warning | 2 |
| Hard Freeze Warning | 1 |
| Freeze Watch | 1 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.