Alert archive / Mississippi / Alcorn County
Weather alerts in Alcorn County, Mississippi, 2017
95 weather alerts in 2017, 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 2017. Tap one for its archive.
- Alerts
- 95
- Warnings
- 17
- Watches
- 16
- Advisories
- 32
- Busiest month
- March18 alerts
- Busiest day
- March 27, 20175 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 Alcorn County in 2017 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 24 minutes after it went out.
Alcorn County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 1 | 67% | 1 | 100% | 24 min |
| Severe thunderstorm warnings | 8 | 3 | 63% | 1 | 0% | |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Memphis, TN: tornado warnings | 71 | 14 | 80% | 25 | 68% | 17 min |
| NWS Memphis, TN: severe thunderstorm warnings | 272 | 132 | 51% | 389 | 70% | 23 min |
| NWS Memphis, TN: flash flood warnings | 99 | 29 | 71% | 71 | 75% | 107 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, 6:19 PM CST | Dense Fog Advisory | MEG | 16 hr |
| Jan 5, 5:45 PM CST | Winter Weather Advisory | MEG | 25 hr |
| Jan 6, 2:14 PM CST | Wind Chill Advisory | MEG | 19 hr |
| Jan 9, 6:16 PM CST | Wind Advisory | MEG | 24 hr |
| Jan 13, 10:08 PM CST | Dense Fog Advisory | MEG | 13 hr |
| Jan 15, 1:04 AM CST | Dense Fog Advisory | MEG | 10 hr |
| Feb 7, 7:28 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Feb 7, 11:25 PM CST | Dense Fog Advisory | MEG | 10 hr |
| Feb 19, 12:34 AM CST | Dense Fog Advisory | MEG | 8 hr |
| Feb 23, 3:32 AM CST | Dense Fog Advisory | MEG | 5 hr |
| Mar 1, 4:19 AM CST | Mesoscale Discussion | SPC | 56 min |
| Mar 1, 10:08 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 7, 3:37 AM CST | Severe Thunderstorm Watch | SPC | 8 hr |
| Mar 7, 8:03 AM CST | Mesoscale Discussion | SPC | 117 min |
| Mar 9, 10:42 PM CST | Mesoscale Discussion | SPC | 63 min |
| Mar 9, 11:18 PM CST | Severe Thunderstorm Watch | SPC | 4 hr |
| Mar 10, 3:30 AM CST | Frost Advisory | MEG | 25 hr |
| Mar 11, 3:45 AM CST | Freeze Warning | MEG | 30 hr |
| Mar 13, 2:40 PM CDT | Freeze Watch | MEG | 13 hr |
| Mar 14, 3:46 AM CDT | Freeze Watch | MEG | 23 hr |
| Mar 14, 3:46 AM CDT | Freeze Warning | MEG | 32 hr |
| Mar 15, 3:03 AM CDT | Freeze Warning | MEG | 31 hr |
| Mar 27, 12:08 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Mar 27, 1:09 PM CDT | Severe Thunderstorm Warning | MEG | 51 min |
| Mar 27, 1:36 PM CDT | Tornado Warning | MEG | 39 min |
| Mar 27, 2:10 PM CDT | Tornado Warning | MEG | 21 min |
| Mar 27, 3:39 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 30, 4:14 AM CDT | Special Weather Statement | MEG | 91 min |
| Apr 2, 8:39 PM CDT | Wind Advisory | MEG | 7 hr |
| Apr 5, 3:33 AM CDT | Wind Advisory | MEG | 31 hr |
| Apr 7, 4:03 AM CDT | Frost Advisory | MEG | 28 hr |
| Apr 21, 1:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Apr 21, 6:49 PM CDT | Special Weather Statement | MEG | 41 min |
| Apr 22, 12:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Apr 22, 2:15 PM CDT | Special Weather Statement | MEG | 45 min |
| Apr 22, 4:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Apr 26, 7:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Apr 26, 9:37 PM CDT | Special Weather Statement | MEG | 53 min |
| Apr 27, 4:08 AM CDT | Flash Flood Watch | MEG | 3 days |
| Apr 30, 2:17 AM CDT | Wind Advisory | MEG | 17 hr |
| Apr 30, 10:36 AM CDT | Tornado Watch | SPC | 8 hr |
| Apr 30, 11:36 AM CDT | Severe Thunderstorm Warning | MEG | 39 min |
| May 20, 2:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 24, 6:21 PM CDT | Special Weather Statement | MEG | 39 min |
| May 27, 4:19 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 27, 6:12 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 27, 9:59 PM CDT | Tornado Watch | SPC | 2 hr |
| May 27, 11:43 PM CDT | Severe Thunderstorm Warning | MEG | 62 min |
| May 28, 12:18 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 15, 11:36 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 15, 11:48 AM CDT | Special Weather Statement | MEG | 42 min |
| Jun 16, 6:25 AM CDT | Dense Fog Advisory | MEG | 2 hr |
| Jun 16, 12:42 PM CDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jun 16, 3:40 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 18, 1:48 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 18, 3:55 PM CDT | Special Weather Statement | MEG | 50 min |
| Jun 18, 4:20 PM CDT | Severe Thunderstorm Warning | MEG | 40 min |
| Jun 22, 2:47 AM CDT | Flash Flood Watch | MEG | 41 hr |
| Jul 4, 5:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 3:23 AM CDT | Special Weather Statement | MEG | 52 min |
| Jul 19, 3:43 AM CDT | Heat Advisory | MEG | 5 days |
| Jul 26, 11:55 AM CDT | Heat Advisory | MEG | 30 hr |
| Jul 26, 3:39 PM CDT | Special Weather Statement | MEG | 21 min |
| Jul 26, 4:01 PM CDT | Special Weather Statement | MEG | 29 min |
| Aug 10, 7:17 AM CDT | Dense Fog Advisory | MEG | 103 min |
| Aug 22, 2:06 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 29, 3:48 PM CDT | Flash Flood Watch | MEG | 68 hr |
| Aug 30, 3:45 PM CDT | Wind Advisory | MEG | 47 hr |
| Aug 31, 11:13 AM CDT | Tornado Watch | SPC | 11 hr |
| Aug 31, 1:57 PM CDT | Tornado Warning | MEG | 18 min |
| Aug 31, 4:32 PM CDT | Severe Thunderstorm Warning | MEG | 28 min |
| Aug 31, 4:59 PM CDT | Severe Thunderstorm Warning | MEG | 26 min |
| Aug 31, 5:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Sep 3, 2:07 AM CDT | Dense Fog Advisory | MEG | 7 hr |
| Sep 11, 4:29 AM CDT | Wind Advisory | MEG | 24 hr |
| Oct 9, 9:02 AM CDT | Dense Fog Advisory | MEG | 58 min |
| Oct 24, 3:18 AM CDT | Frost Advisory | MEG | 30 hr |
| Oct 27, 3:46 AM CDT | Freeze Watch | MEG | 23 hr |
| Oct 28, 2:41 AM CDT | Freeze Warning | MEG | 31 hr |
| Oct 29, 7:45 PM CDT | Freeze Warning | MEG | 12 hr |
| Nov 4, 1:17 AM CDT | Dense Fog Advisory | MEG | 8 hr |
| Nov 6, 11:26 PM CST | Dense Fog Advisory | MEG | 9 hr |
| Nov 15, 6:09 PM CST | Dense Fog Advisory | MEG | 15 hr |
| Nov 17, 3:25 PM CST | Wind Advisory | MEG | 28 hr |
| Nov 18, 3:18 PM CST | Mesoscale Discussion | SPC | 117 min |
| Nov 18, 3:28 PM CST | Severe Thunderstorm Warning | MEG | 47 min |
| Dec 17, 10:40 PM CST | Dense Fog Advisory | MEG | 10 hr |
| Dec 18, 8:25 PM CST | Dense Fog Advisory | MEG | 15 hr |
| Dec 19, 2:34 PM CST | Dense Fog Advisory | MEG | 12 hr |
| Dec 21, 2:41 AM CST | Dense Fog Advisory | MEG | 6 hr |
| Dec 21, 8:56 AM CST | Dense Fog Advisory | MEG | 2 hr |
| Dec 21, 3:31 PM CST | Flash Flood Watch | MEG | 39 hr |
| Dec 22, 3:00 PM CST | Flash Flood Warning | MEG | 6 hr |
| Dec 23, 3:38 AM CST | Severe Thunderstorm Warning | MEG | 37 min |
| Dec 23, 4:08 AM CST | Special Weather Statement | MEG | 52 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 | 8 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 19 |
| Special Weather Statement | 11 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 4 |
| Winter | |
| Winter Weather Advisory | 1 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 5 |
| Freeze Watch | 3 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 18 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.