Alert archive / Mississippi / Alcorn County
Weather alerts in Alcorn County, Mississippi, 2018
138 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Alcorn County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 138
- Warnings
- 33
- Watches
- 18
- Advisories
- 41
- Busiest month
- June24 alerts
- Busiest day
- June 21, 20186 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 5 tornado warnings covering Alcorn County in 2018 had a tornado report inside them.
Alcorn County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 5 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 15 | 10 | 33% | 7 | 100% | 23 min |
| Flash flood warnings | 4 | 0 | 100% | 0 |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Memphis, TN: tornado warnings | 52 | 7 | 87% | 15 | 60% | 18 min |
| NWS Memphis, TN: severe thunderstorm warnings | 344 | 142 | 59% | 379 | 67% | 24 min |
| NWS Memphis, TN: flash flood warnings | 64 | 12 | 81% | 24 | 75% | 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 |
|---|---|---|---|
| Jan 9, 4:53 PM CST | Dense Fog Advisory | MEG | 16 hr |
| Jan 10, 9:21 AM CST | Dense Fog Advisory | MEG | 9 hr |
| Jan 10, 2:39 PM CST | Winter Storm Watch | MEG | 24 hr |
| Jan 11, 3:44 AM CST | Winter Weather Advisory | MEG | 38 hr |
| Jan 11, 2:17 PM CST | Winter Storm Warning | MEG | 28 hr |
| Jan 12, 2:00 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 15, 4:38 AM CST | Winter Weather Advisory | MEG | 34 hr |
| Jan 16, 11:36 AM CST | Wind Chill Advisory | MEG | 24 hr |
| Jan 17, 3:30 PM CST | Wind Chill Advisory | MEG | 18 hr |
| Feb 10, 1:37 PM CST | Areal Flood Advisory | MEG | 3 hr |
| Feb 10, 4:28 PM CST | Areal Flood Advisory | MEG | 2 hr |
| Feb 19, 3:25 PM CST | Flood Watch | MEG | 5 days |
| Feb 22, 8:29 AM CST | Areal Flood Warning | MEG | 3 hr |
| Feb 22, 10:57 AM CST | Areal Flood Warning | MEG | 6 hr |
| Feb 22, 11:28 AM CST | Areal Flood Warning | MEG | 6 hr |
| Feb 22, 10:16 PM CST | Dense Fog Advisory | MEG | 3 hr |
| Feb 24, 3:16 PM CST | Tornado Watch | SPC | 8 hr |
| Feb 24, 5:29 PM CST | Mesoscale Discussion | SPC | 91 min |
| Feb 24, 9:36 PM CST | Tornado Warning | MEG | 39 min |
| Feb 24, 10:00 PM CST | Tornado Warning | MEG | 45 min |
| Feb 24, 10:24 PM CST | Flash Flood Warning | MEG | 3 hr |
| Feb 24, 10:31 PM CST | Tornado Warning | MEG | 15 min |
| Feb 26, 5:33 AM CST | Dense Fog Advisory | MEG | 2 hr |
| Feb 26, 3:04 PM CST | Flood Watch | MEG | 69 hr |
| Mar 1, 2:01 AM CST | Flash Flood Warning | MEG | 9 hr |
| Mar 11, 9:16 AM CDT | Wind Advisory | MEG | 16 hr |
| Mar 12, 2:56 PM CDT | Freeze Watch | MEG | 24 hr |
| Mar 13, 2:33 PM CDT | Freeze Warning | MEG | 19 hr |
| Mar 19, 11:09 AM CDT | Severe Thunderstorm Warning | MEG | 51 min |
| Mar 19, 11:18 AM CDT | Mesoscale Discussion | SPC | 87 min |
| Mar 19, 11:45 AM CDT | Special Weather Statement | MEG | 30 min |
| Mar 19, 2:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Mar 19, 3:28 PM CDT | Tornado Watch | SPC | 9 hr |
| Mar 20, 11:37 AM CDT | Frost Advisory | MEG | 20 hr |
| Mar 21, 3:37 AM CDT | Freeze Warning | MEG | 29 hr |
| Mar 27, 3:23 PM CDT | Flood Watch | MEG | 46 hr |
| Mar 28, 8:36 PM CDT | Severe Thunderstorm Warning | MEG | 39 min |
| Apr 2, 3:35 PM CDT | Wind Advisory | MEG | 30 hr |
| Apr 3, 6:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Apr 3, 7:14 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 4, 3:44 AM CDT | Freeze Warning | MEG | 29 hr |
| Apr 7, 3:44 AM CDT | Freeze Warning | MEG | 29 hr |
| Apr 10, 3:01 PM CDT | Frost Advisory | MEG | 17 hr |
| Apr 12, 2:34 PM CDT | Flash Flood Watch | MEG | 48 hr |
| Apr 13, 10:12 PM CDT | Tornado Watch | SPC | 10 hr |
| Apr 14, 4:35 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Apr 14, 5:26 AM CDT | Severe Thunderstorm Warning | MEG | 64 min |
| Apr 14, 5:39 AM CDT | Severe Thunderstorm Warning | MEG | 66 min |
| Apr 14, 5:44 AM CDT | Tornado Warning | MEG | 18 min |
| Apr 19, 3:05 AM CDT | Frost Advisory | MEG | 30 hr |
| Apr 22, 7:32 PM CDT | Flash Flood Warning | MEG | 3 hr |
| Apr 25, 3:52 AM CDT | Dense Fog Advisory | MEG | 5 hr |
| Apr 27, 12:33 AM CDT | Dense Fog Advisory | MEG | 8 hr |
| May 5, 10:05 PM CDT | Dense Fog Advisory | MEG | 11 hr |
| May 15, 2:53 PM CDT | Special Weather Statement | MEG | 52 min |
| May 16, 2:59 PM CDT | Special Weather Statement | MEG | 31 min |
| May 16, 3:24 PM CDT | Severe Thunderstorm Warning | MEG | 51 min |
| May 19, 2:48 PM CDT | Severe Thunderstorm Warning | MEG | 42 min |
| May 20, 12:32 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 20, 3:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| May 20, 6:26 PM CDT | Mesoscale Discussion | SPC | 64 min |
| May 23, 5:25 AM CDT | Dense Fog Advisory | MEG | 3 hr |
| May 25, 8:45 PM CDT | Areal Flood Advisory | MEG | 60 min |
| May 27, 3:42 PM CDT | Special Weather Statement | MEG | 33 min |
| May 29, 3:39 AM CDT | Flash Flood Watch | MEG | 27 hr |
| Jun 1, 2:41 AM CDT | Mesoscale Discussion | SPC | 34 min |
| Jun 2, 1:27 AM CDT | Dense Fog Advisory | MEG | 8 hr |
| Jun 3, 3:54 AM CDT | Mesoscale Discussion | SPC | 66 min |
| Jun 12, 11:48 PM CDT | Flash Flood Warning | MEG | 3 hr |
| Jun 21, 12:31 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 21, 1:39 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 21, 3:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 21, 5:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 21, 6:39 PM CDT | Special Weather Statement | MEG | 51 min |
| Jun 21, 6:44 PM CDT | Severe Thunderstorm Warning | MEG | 46 min |
| Jun 21, 7:27 PM CDT | Special Weather Statement | MEG | 63 min |
| Jun 21, 8:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 23, 7:17 AM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 23, 8:53 AM CDT | Special Weather Statement | MEG | 52 min |
| Jun 23, 9:33 AM CDT | Severe Thunderstorm Warning | MEG | 42 min |
| Jun 23, 4:50 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jun 24, 2:33 AM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 27, 3:16 PM CDT | Heat Advisory | MEG | 4 days |
| Jun 28, 4:55 PM CDT | Severe Thunderstorm Warning | MEG | 50 min |
| Jun 28, 5:31 PM CDT | Severe Thunderstorm Warning | MEG | 29 min |
| Jun 28, 8:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 28, 11:00 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 28, 11:13 PM CDT | Special Weather Statement | MEG | 47 min |
| Jun 28, 11:53 PM CDT | Special Weather Statement | MEG | 52 min |
| Jul 4, 3:32 AM CDT | Heat Advisory | MEG | 40 hr |
| Jul 4, 3:02 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jul 4, 8:46 PM CDT | Special Weather Statement | MEG | 44 min |
| Jul 4, 9:00 PM CDT | Severe Thunderstorm Warning | MEG | 45 min |
| Jul 4, 9:16 PM CDT | Severe Thunderstorm Warning | MEG | 25 min |
| Jul 4, 9:44 PM CDT | Severe Thunderstorm Warning | MEG | 46 min |
| Jul 5, 6:10 PM CDT | Special Weather Statement | MEG | 50 min |
| Jul 6, 1:11 PM CDT | Severe Thunderstorm Warning | MEG | 49 min |
| Jul 6, 2:22 PM CDT | Special Weather Statement | MEG | 23 min |
| Jul 14, 3:06 AM CDT | Heat Advisory | MEG | 18 hr |
| Jul 15, 3:57 AM CDT | Heat Advisory | MEG | 16 hr |
| Jul 17, 8:14 PM CDT | Areal Flood Advisory | MEG | 2 hr |
| Jul 19, 3:42 PM CDT | Heat Advisory | MEG | 28 hr |
| Jul 20, 5:54 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 20, 6:22 PM CDT | Tornado Watch | SPC | 8 hr |
| Jul 20, 10:20 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jul 21, 1:38 AM CDT | Mesoscale Discussion | SPC | 67 min |
| Aug 19, 4:18 AM CDT | Dense Fog Advisory | MEG | 5 hr |
| Aug 20, 4:45 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 20, 5:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Sep 13, 4:55 PM CDT | Special Weather Statement | MEG | 50 min |
| Sep 29, 2:08 AM CDT | Dense Fog Advisory | MEG | 8 hr |
| Oct 21, 3:22 AM CDT | Frost Advisory | MEG | 30 hr |
| Nov 1, 1:41 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Nov 1, 4:43 AM CDT | Special Weather Statement | MEG | 47 min |
| Nov 2, 8:31 PM CDT | Special Weather Statement | MEG | 44 min |
| Nov 2, 11:41 PM CDT | Dense Fog Advisory | MEG | 9 hr |
| Nov 5, 3:38 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Nov 5, 7:04 PM CST | Tornado Watch | SPC | 8 hr |
| Nov 5, 9:28 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Nov 5, 9:40 PM CST | Tornado Warning | MEG | 24 min |
| Nov 5, 10:44 PM CST | Severe Thunderstorm Warning | MEG | 32 min |
| Nov 5, 10:51 PM CST | Areal Flood Advisory | MEG | 73 min |
| Nov 6, 1:22 AM CST | Dense Fog Advisory | MEG | 7 hr |
| Nov 8, 3:00 AM CST | Freeze Watch | MEG | 12 hr |
| Nov 8, 3:02 PM CST | Freeze Warning | MEG | 42 hr |
| Nov 13, 1:50 PM CST | Winter Weather Advisory | MEG | 43 hr |
| Nov 21, 4:08 AM CST | Freezing Fog Advisory | MEG | 5 hr |
| Nov 24, 10:24 PM CST | Dense Fog Advisory | MEG | 5 hr |
| Dec 11, 1:43 AM CST | Freezing Fog Advisory | MEG | 10 hr |
| Dec 16, 2:21 PM CST | Dense Fog Advisory | MEG | 22 hr |
| Dec 24, 6:57 AM CST | Freezing Fog Advisory | MEG | 2 hr |
| Dec 26, 10:40 AM CST | Wind Advisory | MEG | 28 hr |
| Dec 27, 12:50 PM CST | Special Weather Statement | MEG | 40 min |
| Dec 31, 1:12 AM CST | Areal Flood Advisory | MEG | 2 hr |
| Dec 31, 11:22 AM CST | Mesoscale Discussion | SPC | 83 min |
| Dec 31, 11:47 AM CST | Tornado Watch | SPC | 5 hr |
| Dec 31, 12:08 PM CST | Special Weather Statement | MEG | 37 min |
| Dec 31, 12:42 PM CST | Special Weather Statement | MEG | 48 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 | 15 |
| Tornado Warning | 5 |
| Severe Thunderstorm Watch | 4 |
| Tornado Watch | 6 |
| Mesoscale Discussion | 28 |
| Special Weather Statement | 18 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 4 |
| Flash Flood Watch | 2 |
| Flood Watch | 3 |
| Areal Flood Advisory | 6 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 3 |
| Heat | |
| Heat Advisory | 5 |
| Cold | |
| Freeze Warning | 5 |
| Freeze Watch | 2 |
| Frost Advisory | 4 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 15 |
| Freezing Fog Advisory | 3 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.