Alert archive / Mississippi / Walthall County
Weather alerts in Walthall County, Mississippi, 2011
163 weather alerts in 2011, 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 2011. Tap one for its archive.
- Alerts
- 163
- Warnings
- 42
- Watches
- 33
- Advisories
- 31
- Busiest month
- March28 alerts
- Busiest day
- September 4, 201110 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 10 tornado warnings covering Walthall County in 2011 had a tornado report inside them.
Walthall County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 10 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 17 | 10 | 41% | 11 | 55% | 33 min |
| Flash flood warnings | 1 | 1 | 0% | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS New Orleans, LA: tornado warnings | 170 | 18 | 89% | 51 | 61% | 17 min |
| NWS New Orleans, LA: severe thunderstorm warnings | 214 | 77 | 64% | 301 | 62% | 25 min |
| NWS New Orleans, LA: flash flood warnings | 35 | 12 | 66% | 32 | 59% | 34 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, 3:10 AM CST | Tornado Watch | SPC | 7 hr |
| Jan 1, 5:19 AM CST | Tornado Warning | LIX | 63 days |
| Jan 2, 4:25 AM CST | Hard Freeze Watch | LIX | 15 hr |
| Jan 2, 7:50 PM CST | Hard Freeze Warning | LIX | 9 hr |
| Jan 8, 5:07 AM CST | Winter Storm Watch | LIX | 23 hr |
| Jan 9, 3:42 AM CST | Winter Weather Advisory | LIX | 16 hr |
| Jan 11, 3:48 AM CST | Hard Freeze Warning | LIX | 29 hr |
| Jan 12, 3:41 AM CST | Hard Freeze Warning | LIX | 29 hr |
| Jan 13, 3:52 AM CST | Hard Freeze Warning | LIX | 29 hr |
| Jan 21, 3:21 PM CST | Hard Freeze Warning | LIX | 17 hr |
| Jan 31, 1:17 AM CST | Dense Fog Advisory | LIX | 8 hr |
| Feb 1, 5:05 AM CST | Wind Advisory | LIX | 25 hr |
| Feb 1, 8:40 AM CST | Tornado Watch | SPC | 6 hr |
| Feb 1, 12:00 PM CST | Mesoscale Discussion | SPC | 60 min |
| Feb 1, 12:45 PM CST | Severe Thunderstorm Warning | LIX | 60 min |
| Feb 1, 1:17 PM CST | Severe Thunderstorm Warning | LIX | 58 min |
| Feb 1, 1:23 PM CST | Mesoscale Discussion | SPC | 67 min |
| Feb 1, 2:11 PM CST | Severe Thunderstorm Warning | LIX | 49 min |
| Feb 2, 4:49 PM CST | Winter Storm Watch | LIX | 11 hr |
| Feb 2, 4:49 PM CST | Winter Weather Advisory | LIX | 17 hr |
| Feb 3, 3:53 AM CST | Winter Storm Warning | LIX | 31 hr |
| Feb 3, 12:58 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 9, 3:19 PM CST | Hard Freeze Watch | LIX | 14 hr |
| Feb 10, 4:53 AM CST | Hard Freeze Warning | LIX | 28 hr |
| Feb 11, 3:30 AM CST | Hard Freeze Warning | LIX | 30 hr |
| Feb 17, 11:47 PM CST | Dense Fog Advisory | LIX | 9 hr |
| Feb 18, 2:42 PM CST | Dense Fog Advisory | LIX | 18 hr |
| Feb 19, 11:25 AM CST | Dense Fog Advisory | LIX | 22 hr |
| Mar 5, 8:54 AM CST | Tornado Watch | SPC | 7 hr |
| Mar 5, 11:12 AM CST | Mesoscale Discussion | SPC | 93 min |
| Mar 7, 3:52 PM CST | Flash Flood Watch | LIX | 50 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, 4:27 PM CST | Flash Flood Warning | LIX | 3 hr |
| Mar 8, 4:37 PM CST | Tornado Warning | LIX | 19 min |
| 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 9, 1:28 AM CST | Mesoscale Discussion | SPC | 92 min |
| Mar 9, 2:39 AM CST | Tornado Watch | SPC | 5 hr |
| Mar 9, 3:48 AM CST | Tornado Warning | LIX | 27 min |
| Mar 9, 5:23 AM CST | Tornado Warning | LIX | 37 min |
| Mar 9, 6:28 AM CST | Mesoscale Discussion | SPC | 92 min |
| Mar 9, 12:05 PM CST | River Flood Warning | LIX | 58 hr |
| Mar 14, 12:49 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Mar 14, 1:22 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Mar 18, 3:36 AM CDT | Dense Fog Advisory | LIX | 5 hr |
| Mar 20, 10:12 PM CDT | Dense Fog Advisory | LIX | 6 hr |
| Mar 29, 2:48 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Mar 29, 3:17 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 29, 6:12 PM CDT | Severe Thunderstorm Warning | LIX | 63 min |
| Mar 29, 6:47 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Mar 29, 8:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Mar 29, 9:42 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 29, 10:22 PM CDT | Flood Watch | LIX | 9 hr |
| Apr 3, 3:23 PM CDT | Wind Advisory | LIX | 40 hr |
| Apr 4, 10:53 AM CDT | Tornado Watch | SPC | 7 hr |
| Apr 4, 5:28 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 4, 5:47 PM CDT | Severe Thunderstorm Warning | LIX | 58 min |
| Apr 4, 6:03 PM CDT | Severe Thunderstorm Warning | LIX | 42 min |
| Apr 4, 6:51 PM CDT | Severe Thunderstorm Warning | LIX | 54 min |
| Apr 11, 4:05 PM CDT | Tornado Watch | SPC | 6 hr |
| Apr 15, 7:32 AM CDT | Tornado Watch | SPC | 7 hr |
| Apr 15, 10:28 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 15, 1:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 15, 2:41 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 15, 3:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Apr 15, 4:09 PM CDT | Tornado Warning | LIX | 36 min |
| Apr 15, 6:09 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Apr 15, 7:51 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Apr 21, 10:00 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Apr 26, 2:55 PM CDT | Wind Advisory | LIX | 40 hr |
| Apr 27, 6:27 PM CDT | Mesoscale Discussion | SPC | 33 min |
| May 2, 1:51 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 13, 7:58 PM CDT | Mesoscale Discussion | SPC | 62 min |
| May 26, 2:05 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Jun 2, 5:58 PM CDT | Heat Advisory | LIX | 22 hr |
| Jun 3, 5:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 4, 4:49 AM CDT | Heat Advisory | LIX | 13 hr |
| Jun 4, 6:03 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 5, 4:06 AM CDT | Heat Advisory | LIX | 15 hr |
| Jun 5, 6:13 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 7:52 PM CDT | Severe Thunderstorm Warning | LIX | 23 min |
| Jun 5, 8:13 PM CDT | Severe Thunderstorm Warning | LIX | 32 min |
| Jun 6, 4:26 PM CDT | Severe Thunderstorm Warning | LIX | 34 min |
| Jun 6, 5:09 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 7, 2:01 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 7, 4:18 PM CDT | Severe Thunderstorm Warning | LIX | 27 min |
| Jun 7, 4:49 PM CDT | Severe Thunderstorm Warning | LIX | 26 min |
| Jun 7, 5:41 PM CDT | Areal Flood Advisory | LIX | 2 hr |
| Jun 7, 6:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 13, 1:32 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 13, 8:45 PM CDT | Severe Thunderstorm Warning | LIX | 45 min |
| Jun 17, 1:15 PM CDT | Heat Advisory | LIX | 28 hr |
| Jun 21, 4:55 PM CDT | Severe Thunderstorm Warning | LIX | 43 min |
| Jun 30, 2:28 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 2, 12:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 19, 6:53 AM CDT | Dense Fog Advisory | LIX | 70 min |
| Jul 23, 1:05 PM CDT | Areal Flood Advisory | LIX | 115 min |
| Jul 26, 4:05 AM CDT | Flash Flood Watch | LIX | 15 hr |
| Jul 31, 10:40 AM CDT | Heat Advisory | LIX | 65 hr |
| Aug 3, 4:05 AM CDT | Excessive Heat Warning | LIX | 63 hr |
| Aug 5, 3:41 AM CDT | Excessive Heat Watch | LIX | 11 hr |
| Aug 5, 2:21 PM CDT | Heat Advisory | LIX | 29 hr |
| Aug 8, 4:52 PM CDT | Excessive Heat Watch | LIX | 35 hr |
| Aug 9, 4:54 PM CDT | Heat Advisory | LIX | 3 days |
| Aug 12, 2:05 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Aug 13, 1:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 14, 1:14 PM CDT | Heat Advisory | LIX | 4 hr |
| Aug 18, 1:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Aug 18, 4:19 PM CDT | Severe Thunderstorm Warning | LIX | 56 min |
| Aug 22, 3:45 PM CDT | Heat Advisory | LIX | 51 hr |
| Aug 23, 4:40 PM CDT | Mesoscale Discussion | SPC | 35 min |
| Aug 24, 6:57 PM CDT | Heat Advisory | LIX | 48 hr |
| Sep 1, 4:03 AM CDT | Flash Flood Watch | LIX | 4 days |
| Sep 1, 7:02 PM CDT | Tropical Storm Warning | LIX | 3 days |
| Sep 3, 1:43 AM CDT | Tornado Watch | SPC | 8 hr |
| Sep 3, 6:58 AM CDT | Tornado Warning | LIX | 47 min |
| Sep 3, 9:41 AM CDT | Tornado Watch | SPC | 12 hr |
| Sep 3, 1:41 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Sep 3, 5:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 3, 9:43 PM CDT | Tornado Watch | SPC | 9 hr |
| Sep 3, 11:35 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Sep 4, 3:23 AM CDT | Tornado Warning | LIX | 14 min |
| Sep 4, 4:30 AM CDT | Mesoscale Discussion | SPC | 60 min |
| Sep 4, 5:05 AM CDT | Tornado Watch | SPC | 11 hr |
| Sep 4, 9:50 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Sep 4, 2:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Sep 4, 3:43 PM CDT | Tornado Warning | LIX | 47 min |
| Sep 4, 3:47 PM CDT | Tornado Watch | SPC | 6 hr |
| Sep 4, 6:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 4, 9:42 PM CDT | Tornado Watch | SPC | 9 hr |
| Sep 4, 10:43 PM CDT | Wind Advisory | LIX | 25 hr |
| Sep 4, 11:35 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Sep 5, 9:33 AM CDT | River Flood Warning | LIX | 49 hr |
| Sep 20, 12:56 AM CDT | Dense Fog Advisory | LIX | 8 hr |
| Sep 28, 12:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 28, 1:56 PM CDT | Severe Thunderstorm Warning | LIX | 64 min |
| Sep 28, 1:59 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 28, 5:19 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Sep 28, 9:41 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Nov 10, 11:38 PM CST | Freeze Warning | LIX | 7 hr |
| Nov 15, 8:59 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Nov 16, 1:35 AM CST | Mesoscale Discussion | SPC | 115 min |
| Nov 16, 1:44 AM CST | Tornado Warning | LIX | 46 min |
| Nov 16, 2:20 AM CST | Tornado Watch | SPC | 8 hr |
| Nov 16, 3:25 AM CST | Tornado Warning | LIX | 35 min |
| Nov 16, 5:33 AM CST | Mesoscale Discussion | SPC | 87 min |
| Nov 17, 3:48 PM CST | Freeze Warning | LIX | 12 hr |
| Nov 20, 12:06 AM CST | Dense Fog Advisory | LIX | 9 hr |
| Nov 20, 3:45 PM CST | Dense Fog Advisory | LIX | 17 hr |
| Nov 22, 10:26 AM CST | Mesoscale Discussion | SPC | 94 min |
| Nov 26, 6:04 PM CST | Mesoscale Discussion | SPC | 56 min |
| Dec 20, 11:25 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Dec 20, 5:11 PM 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, 7:50 AM CST | Mesoscale Discussion | SPC | 55 min |
| Dec 22, 8:58 AM CST | Severe Thunderstorm Warning | LIX | 62 min |
| Dec 30, 3:01 AM CST | Dense Fog Advisory | LIX | 6 hr |
| Dec 30, 9:37 PM CST | Dense Fog Advisory | LIX | 13 hr |
| Dec 31, 2:19 PM CST | Dense Fog Advisory | LIX | 19 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 | 17 |
| Tornado Warning | 10 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 21 |
| Mesoscale Discussion | 57 |
| Flooding | |
| Flash Flood Warning | 1 |
| River Flood Warning | 2 |
| Flash Flood Watch | 3 |
| Flood Watch | 1 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 2 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 2 |
| Heat Advisory | 10 |
| Cold | |
| Freeze Warning | 2 |
| Hard Freeze Warning | 7 |
| Hard Freeze Watch | 2 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 13 |
| Tropical | |
| Tropical Storm Warning | 1 |
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.