Alert archive / Mississippi / Walthall County

Weather alerts in Walthall County, Mississippi, 2018

102 weather alerts in 2018, 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 2018. Tap one for its archive.

Alerts
102
Warnings
25
Watches
12
Advisories
25
Busiest month
April22 alerts
Busiest day
April 14, 20189 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 5 tornado warnings covering Walthall County in 2018 had a tornado report inside them.

Walthall County, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings5180%0
Severe thunderstorm warnings5260%367%20 min
Flash flood warnings220%2100%281 min

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS New Orleans, LA: tornado warnings43491%2438%20 min
NWS New Orleans, LA: severe thunderstorm warnings1263771%10258%21 min
NWS New Orleans, LA: flash flood warnings191332%2685%130 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.

IssuedProductOfficeLasted
Jan 1, 3:35 AM CSTHard Freeze WarningLIX51 hr
Jan 1, 3:45 AM CSTWind Chill AdvisoryLIX29 hr
Jan 2, 3:52 PM CSTHard Freeze WarningLIX43 hr
Jan 3, 3:39 PM CSTHard Freeze WarningLIX42 hr
Jan 7, 4:37 AM CSTFlash Flood WatchLIX31 hr
Jan 9, 8:57 PM CSTDense Fog AdvisoryLIX12 hr
Jan 12, 4:04 PM CSTHard Freeze WatchLIX12 hr
Jan 13, 3:46 AM CSTHard Freeze WarningLIX12 hr
Jan 13, 3:34 PM CSTHard Freeze WarningLIX18 hr
Jan 15, 3:49 PM CSTHard Freeze WarningLIX44 hr
Jan 15, 4:04 PM CSTWind Chill AdvisoryLIX45 hr
Jan 15, 4:04 PM CSTWinter Weather AdvisoryLIX32 hr
Jan 16, 3:17 PM CSTHard Freeze WarningLIX44 hr
Jan 17, 4:45 PM CSTWind Chill AdvisoryLIX16 hr
Jan 18, 3:36 AM CSTHard Freeze WarningLIX30 hr
Jan 27, 4:33 AM CSTFlash Flood WatchLIX11 hr
Jan 27, 1:21 PM CSTAreal Flood AdvisoryLIX3 hr
Jan 27, 1:42 PM CSTSpecial Weather StatementLIX48 min
Feb 7, 4:11 AM CSTMesoscale DiscussionSPC3 hr
Feb 7, 7:42 AM CSTSpecial Weather StatementLIX48 min
Feb 11, 10:27 AM CSTSpecial Weather StatementLIX33 min
Feb 14, 4:01 PM CSTDense Fog AdvisoryLIX18 hr
Feb 23, 12:23 PM CSTAreal Flood AdvisoryLIX112 min
Feb 24, 5:29 PM CSTMesoscale DiscussionSPC91 min
Mar 1, 11:31 AM CSTSpecial Weather StatementLIX59 min
Mar 29, 7:55 AM CDTSpecial Weather StatementLIX65 min
Apr 3, 9:06 PM CDTSpecial Weather StatementLIX54 min
Apr 3, 10:00 PM CDTSpecial Weather StatementLIX30 min
Apr 3, 10:30 PM CDTSpecial Weather StatementLIX30 min
Apr 3, 11:00 PM CDTSpecial Weather StatementLIX30 min
Apr 3, 11:33 PM CDTMesoscale DiscussionSPC57 min
Apr 6, 8:12 PM CDTMesoscale DiscussionSPC63 min
Apr 6, 8:53 PM CDTSevere Thunderstorm WatchSPC10 hr
Apr 6, 10:57 PM CDTMesoscale DiscussionSPC93 min
Apr 6, 11:44 PM CDTSevere Thunderstorm WarningLIX61 min
Apr 7, 12:52 AM CDTSpecial Weather StatementLIX38 min
Apr 7, 1:27 AM CDTTornado WarningLIX18 min
Apr 13, 9:30 AM CDTFlash Flood WatchLIX40 hr
Apr 14, 6:37 AM CDTMesoscale DiscussionSPC83 min
Apr 14, 6:57 AM CDTTornado WatchSPC7 hr
Apr 14, 8:22 AM CDTTornado WarningLIX38 min
Apr 14, 8:45 AM CDTSevere Thunderstorm WarningLIX45 min
Apr 14, 8:55 AM CDTTornado WarningLIX35 min
Apr 14, 9:01 AM CDTTornado WarningLIX29 min
Apr 14, 9:30 AM CDTSevere Thunderstorm WarningLIX45 min
Apr 14, 9:51 AM CDTAreal Flood AdvisoryLIX3 hr
Apr 14, 10:14 AM CDTAreal Flood AdvisoryLIX3 hr
Apr 22, 10:37 AM CDTMesoscale DiscussionSPC2 hr
May 22, 2:56 PM CDTSpecial Weather StatementLIX49 min
May 25, 10:41 AM CDTFlash Flood WatchLIX53 hr
May 25, 4:32 PM CDTSpecial Weather StatementLIX28 min
May 26, 4:17 PM CDTSpecial Weather StatementLIX28 min
May 26, 4:48 PM CDTSpecial Weather StatementLIX27 min
Jun 3, 3:49 PM CDTMesoscale DiscussionSPC56 min
Jun 28, 9:53 PM CDTSpecial Weather StatementLIX37 min
Jun 28, 10:59 PM CDTSpecial Weather StatementLIX61 min
Jul 2, 3:49 PM CDTSpecial Weather StatementLIX41 min
Jul 3, 12:19 PM CDTMesoscale DiscussionSPC116 min
Jul 6, 9:57 PM CDTSpecial Weather StatementLIX93 min
Jul 6, 10:35 PM CDTAreal Flood AdvisoryLIX115 min
Jul 6, 10:54 PM CDTAreal Flood AdvisoryLIX66 min
Jul 7, 6:14 PM CDTSevere Thunderstorm WarningLIX31 min
Jul 19, 3:31 PM CDTHeat AdvisoryLIX3 days
Aug 18, 4:14 PM CDTAreal Flood AdvisoryLIX2 hr
Aug 19, 2:35 PM CDTSpecial Weather StatementJAN25 min
Aug 28, 12:27 PM CDTSpecial Weather StatementLIX18 min
Aug 29, 2:30 PM CDTSpecial Weather StatementLIX45 min
Aug 29, 2:58 PM CDTAreal Flood AdvisoryLIX62 min
Aug 29, 3:23 PM CDTSpecial Weather StatementLIX37 min
Sep 3, 4:28 AM CDTTropical Storm WarningLIX48 hr
Sep 3, 4:45 AM CDTFlash Flood WatchLIX59 hr
Oct 29, 3:30 PM CDTDense Fog AdvisoryLIX20 hr
Oct 31, 10:01 PM CDTMesoscale DiscussionSPC89 min
Oct 31, 11:07 PM CDTTornado WatchSPC9 hr
Nov 1, 1:19 AM CDTMesoscale DiscussionSPC116 min
Nov 1, 2:56 AM CDTSevere Thunderstorm WarningLIX34 min
Nov 1, 3:38 AM CDTTornado WarningLIX37 min
Nov 1, 3:48 AM CDTSpecial Weather StatementLIX27 min
Nov 1, 4:30 AM CDTMesoscale DiscussionSPC2 hr
Nov 4, 10:26 PM CSTDense Fog AdvisoryLIX10 hr
Nov 13, 3:36 PM CSTFreeze WatchLIX15 hr
Nov 14, 6:07 AM CSTFreeze WarningLIX27 hr
Nov 23, 9:58 PM CSTDense Fog AdvisoryLIX10 hr
Nov 24, 10:30 PM CSTDense Fog AdvisoryLIX10 hr
Nov 26, 4:42 AM CSTFreeze WarningLIX27 hr
Dec 7, 10:11 AM CSTRiver Flood WarningLIX3 days
Dec 14, 3:23 AM CSTDense Fog AdvisoryLIX6 hr
Dec 18, 3:47 AM CSTDense Fog AdvisoryLIX5 hr
Dec 19, 9:57 PM CSTDense Fog AdvisoryLIX9 hr
Dec 26, 3:20 PM CSTFlash Flood WatchLIX45 hr
Dec 26, 7:05 PM CSTSpecial Weather StatementLIX55 min
Dec 26, 8:06 PM CSTSpecial Weather StatementLIX69 min
Dec 27, 9:29 AM CSTTornado WatchSPC9 hr
Dec 27, 10:20 AM CSTWind AdvisoryLIX6 hr
Dec 27, 1:50 PM CSTMesoscale DiscussionSPC85 min
Dec 27, 2:56 PM CSTAreal Flood AdvisoryLIX3 hr
Dec 27, 3:48 PM CSTFlash Flood WarningLIX10 hr
Dec 27, 8:52 PM CSTRiver Flood WarningLIX13 hr
Dec 27, 9:30 PM CSTFlash Flood Warning EmergencyLIX3 hr
Dec 30, 9:48 AM CSTDense Fog AdvisoryLIX17 hr
Dec 31, 7:02 AM CSTMesoscale DiscussionSPC118 min
Dec 31, 2:13 PM CSTSpecial Weather StatementLIX62 min

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

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.