Alert archive / Mississippi / Walthall County
Weather alerts in Walthall County, Mississippi, 2015
123 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Walthall County and its neighbors
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 123
- Warnings
- 23
- Watches
- 18
- Advisories
- 23
- Busiest month
- April19 alerts
- Busiest day
- January 3, 201510 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 4 tornado warnings covering Walthall County in 2015 had a tornado report inside them.
Walthall County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 10 | 4 | 60% | 1 | 100% | 27 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS New Orleans, LA: tornado warnings | 70 | 9 | 87% | 30 | 43% | 7 min |
| NWS New Orleans, LA: severe thunderstorm warnings | 165 | 49 | 70% | 141 | 65% | 18 min |
| NWS New Orleans, LA: flash flood warnings | 35 | 15 | 57% | 34 | 94% | 69 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 2, 10:06 PM CST | Dense Fog Advisory | LIX | 8 hr |
| Jan 3, 10:24 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 3, 11:04 AM CST | Tornado Watch | SPC | 7 hr |
| Jan 3, 12:31 PM CST | Severe Thunderstorm Warning | LIX | 59 min |
| Jan 3, 1:18 PM CST | Severe Thunderstorm Warning | LIX | 27 min |
| Jan 3, 1:29 PM CST | Tornado Warning | LIX | 31 min |
| Jan 3, 1:43 PM CST | Mesoscale Discussion | SPC | 92 min |
| Jan 3, 2:38 PM CST | Wind Advisory | LIX | 3 hr |
| Jan 3, 3:17 PM CST | Areal Flood Advisory | LIX | 118 min |
| Jan 3, 5:31 PM CST | Mesoscale Discussion | SPC | 44 min |
| Jan 6, 3:51 AM CST | Hard Freeze Watch | LIX | 25 hr |
| Jan 7, 4:40 AM CST | Wind Chill Advisory | LIX | 28 hr |
| Jan 7, 4:52 AM CST | Hard Freeze Warning | LIX | 29 hr |
| Jan 7, 4:52 AM CST | Wind Advisory | LIX | 25 hr |
| Jan 9, 12:48 AM CST | Winter Weather Advisory | LIX | 10 hr |
| Jan 12, 12:46 AM CST | Dense Fog Advisory | LIX | 8 hr |
| Feb 1, 7:55 PM CST | Special Weather Statement | LIX | 35 min |
| Feb 16, 1:46 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Feb 16, 3:53 PM CST | Special Weather Statement | LIX | 82 min |
| Feb 18, 4:15 AM CST | Hard Freeze Warning | LIX | 24 hr |
| Mar 2, 3:20 PM CST | Dense Fog Advisory | LIX | 18 hr |
| Mar 5, 3:57 PM CST | Freeze Warning | LIX | 17 hr |
| Mar 6, 3:23 PM CST | Freeze Warning | LIX | 17 hr |
| Mar 10, 4:10 AM CDT | Flash Flood Watch | LIX | 3 days |
| Mar 13, 7:41 AM CDT | Special Weather Statement | LIX | 19 min |
| Mar 26, 2:48 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 6, 1:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Apr 7, 5:48 AM CDT | Special Weather Statement | LIX | 72 min |
| Apr 9, 7:31 PM CDT | Tornado Warning | LIX | 29 min |
| Apr 10, 12:05 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Apr 15, 7:18 AM CDT | Dense Fog Advisory | LIX | 102 min |
| Apr 15, 3:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Apr 15, 5:59 PM CDT | Severe Thunderstorm Warning | LIX | 46 min |
| Apr 15, 6:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 15, 6:44 PM CDT | Severe Thunderstorm Warning | LIX | 17 min |
| Apr 18, 6:17 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 19, 2:06 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Apr 19, 8:02 PM CDT | Tornado Watch | SPC | 5 hr |
| Apr 19, 10:16 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Apr 25, 9:35 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Apr 25, 10:41 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 27, 4:22 AM CDT | Flash Flood Watch | LIX | 24 hr |
| Apr 27, 6:01 AM CDT | Tornado Watch | SPC | 7 hr |
| Apr 27, 7:44 AM CDT | Mesoscale Discussion | SPC | 91 min |
| Apr 27, 9:47 AM CDT | Mesoscale Discussion | SPC | 88 min |
| May 11, 12:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 11, 1:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 15, 12:00 PM CDT | Special Weather Statement | LIX | 30 min |
| May 15, 1:19 PM CDT | Special Weather Statement | LIX | 41 min |
| May 19, 5:45 AM CDT | Dense Fog Advisory | LIX | 3 hr |
| May 21, 3:10 PM CDT | Severe Thunderstorm Warning | LIX | 50 min |
| May 24, 1:49 PM CDT | Tornado Watch | SPC | 8 hr |
| May 24, 5:03 PM CDT | Mesoscale Discussion | SPC | 117 min |
| May 24, 7:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 25, 2:38 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 25, 10:37 PM CDT | Tornado Watch | SPC | 6 hr |
| May 25, 11:15 PM CDT | Flash Flood Watch | LIX | 9 hr |
| May 25, 11:57 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 26, 2:45 AM CDT | Severe Thunderstorm Warning | LIX | 45 min |
| May 27, 11:08 AM CDT | Special Weather Statement | LIX | 52 min |
| May 30, 5:16 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 9, 7:30 AM CDT | Special Weather Statement | LIX | 30 min |
| Jun 9, 8:02 AM CDT | Special Weather Statement | LIX | 58 min |
| Jun 13, 1:36 PM CDT | Special Weather Statement | LIX | 39 min |
| Jun 24, 1:55 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jun 26, 3:32 PM CDT | Special Weather Statement | LIX | 58 min |
| Jun 30, 11:38 AM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 30, 4:32 PM CDT | Special Weather Statement | LIX | 43 min |
| Jul 4, 12:17 PM CDT | Special Weather Statement | LIX | 43 min |
| Jul 5, 1:29 PM CDT | Special Weather Statement | LIX | 46 min |
| Jul 5, 1:56 PM CDT | Severe Thunderstorm Warning | LIX | 34 min |
| Jul 17, 3:39 PM CDT | Heat Advisory | LIX | 60 hr |
| Jul 20, 3:43 AM CDT | Heat Advisory | LIX | 12 hr |
| Jul 21, 9:36 AM CDT | Heat Advisory | LIX | 6 hr |
| Jul 30, 11:49 AM CDT | Heat Advisory | LIX | 6 hr |
| Jul 30, 3:00 PM CDT | Severe Thunderstorm Warning | LIX | 45 min |
| Aug 7, 3:51 PM CDT | Heat Advisory | LIX | 24 hr |
| Aug 8, 3:48 PM CDT | Excessive Heat Warning | LIX | 36 hr |
| Aug 8, 7:23 PM CDT | Severe Thunderstorm Warning | LIX | 37 min |
| Aug 10, 4:13 AM CDT | Excessive Heat Warning | LIX | 15 hr |
| Aug 10, 3:57 PM CDT | Heat Advisory | LIX | 27 hr |
| Aug 10, 6:33 PM CDT | Special Weather Statement | LIX | 57 min |
| Aug 11, 6:49 AM CDT | Special Weather Statement | LIX | 56 min |
| Aug 11, 7:43 AM CDT | Special Weather Statement | LIX | 47 min |
| Aug 20, 4:48 PM CDT | Special Weather Statement | LIX | 57 min |
| Oct 15, 2:48 PM CDT | Fire Weather Watch | LIX | 3 days |
| Oct 24, 3:35 PM CDT | Flash Flood Watch | LIX | 42 hr |
| Oct 25, 9:40 AM CDT | River Flood Warning | LIX | 3 days |
| Oct 30, 1:26 PM CDT | Flash Flood Watch | LIX | 50 hr |
| Oct 31, 11:01 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Oct 31, 11:45 AM CDT | Tornado Watch | SPC | 8 hr |
| Oct 31, 1:35 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Oct 31, 2:36 PM CDT | Tornado Warning | LIX | 39 min |
| Oct 31, 3:36 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Oct 31, 5:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Nov 16, 3:55 PM CST | Flash Flood Watch | LIX | 40 hr |
| Nov 17, 10:42 AM CST | Wind Advisory | LIX | 9 hr |
| Nov 17, 12:19 PM CST | Mesoscale Discussion | SPC | 116 min |
| Nov 17, 7:45 PM CST | Tornado Watch | SPC | 7 hr |
| Nov 17, 11:11 PM CST | Mesoscale Discussion | SPC | 94 min |
| Nov 18, 1:14 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Nov 19, 12:30 AM CST | Dense Fog Advisory | LIX | 6 hr |
| Nov 21, 3:37 AM CST | Freeze Watch | LIX | 24 hr |
| Nov 22, 3:54 AM CST | Freeze Warning | LIX | 28 hr |
| Dec 10, 1:17 AM CST | Dense Fog Advisory | LIX | 8 hr |
| Dec 13, 9:28 AM CST | Wind Advisory | LIX | 9 hr |
| Dec 13, 6:05 PM CST | Special Weather Statement | LIX | 115 min |
| Dec 13, 6:16 PM CST | Mesoscale Discussion | SPC | 119 min |
| Dec 13, 7:55 PM CST | Special Weather Statement | LIX | 2 hr |
| Dec 18, 2:39 PM CST | Freeze Warning | LIX | 17 hr |
| Dec 21, 5:47 PM CST | Mesoscale Discussion | SPC | 118 min |
| Dec 22, 4:06 AM CST | Dense Fog Advisory | LIX | 5 hr |
| Dec 23, 2:34 AM CST | Mesoscale Discussion | SPC | 86 min |
| Dec 23, 1:33 PM CST | Mesoscale Discussion | SPC | 57 min |
| Dec 23, 5:12 PM CST | Mesoscale Discussion | SPC | 63 min |
| Dec 24, 5:48 PM CST | Dense Fog Advisory | LIX | 15 hr |
| Dec 27, 3:15 PM CST | Mesoscale Discussion | SPC | 90 min |
| Dec 28, 12:00 AM CST | Wind Advisory | LIX | 8 hr |
| Dec 28, 2:03 AM CST | Mesoscale Discussion | SPC | 117 min |
| Dec 28, 2:23 AM CST | Tornado Watch | SPC | 8 hr |
| Dec 28, 4:29 AM CST | Severe Thunderstorm Warning | LIX | 31 min |
| Dec 28, 4:35 AM CST | Tornado Warning | LIX | 25 min |
| Dec 28, 5:14 AM CST | Mesoscale Discussion | SPC | 2 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 | 10 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 8 |
| Mesoscale Discussion | 39 |
| Special Weather Statement | 20 |
| Flooding | |
| River Flood Warning | 1 |
| Flash Flood Watch | 6 |
| Areal Flood Advisory | 1 |
| Winter | |
| Winter Weather Advisory | 1 |
| Heat | |
| Excessive Heat Warning | 2 |
| Heat Advisory | 6 |
| Cold | |
| Freeze Warning | 4 |
| Hard Freeze Warning | 2 |
| Freeze Watch | 1 |
| Hard Freeze Watch | 1 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fire | |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 9 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20142016
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.