Alert archive / Mississippi / Marion County

Weather alerts in Marion County, Mississippi, 2020

116 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Marion County and its neighbors

Each county as a circle sized by its count in 2020. Tap one for its archive.

Alerts
116
Warnings
29
Watches
14
Advisories
20
Busiest month
April22 alerts
Busiest day
April 12, 20206 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

5 of 5 tornado warnings covering Marion County in 2020 had a tornado report inside them; 13 of 14 tornado reports fell inside a warning, on average 22 minutes after it went out.

Marion County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings550%1493%22 min
Severe thunderstorm warnings12118%1362%16 min
Flash flood warnings4325%450%5 min

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Jackson, MS: tornado warnings603738%14985%26 min
NWS Jackson, MS: severe thunderstorm warnings42326837%89883%26 min
NWS Jackson, MS: flash flood warnings1087332%27685%87 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, 10:01 AM CSTRiver Flood WarningJAN30 days
Jan 9, 2:27 PM CSTWind AdvisoryJAN48 hr
Jan 10, 9:29 AM CSTSpecial Weather StatementJAN46 min
Jan 11, 7:39 AM CSTMesoscale DiscussionSPC96 min
Jan 11, 7:57 AM CSTTornado WatchSPC9 hr
Jan 11, 9:21 AM CSTSevere Thunderstorm WarningJAN54 min
Jan 13, 2:36 PM CSTDense Fog AdvisoryJAN18 hr
Jan 18, 12:43 PM CSTMesoscale DiscussionSPC2 hr
Jan 28, 12:33 AM CSTDense Fog AdvisoryJAN10 hr
Jan 30, 4:11 AM CSTDense Fog AdvisoryJAN5 hr
Feb 5, 11:49 AM CSTTornado WatchSPC6 hr
Feb 5, 3:59 PM CSTSevere Thunderstorm WarningJAN61 min
Feb 5, 5:06 PM CSTMesoscale DiscussionSPC84 min
Feb 5, 5:50 PM CSTTornado WatchSPC6 hr
Feb 5, 9:43 PM CSTMesoscale DiscussionSPC2 hr
Feb 5, 11:15 PM CSTMesoscale DiscussionSPC2 hr
Feb 5, 11:21 PM CSTSevere Thunderstorm WarningJAN39 min
Feb 5, 11:48 PM CSTTornado WatchSPC8 hr
Feb 6, 12:33 AM CSTSpecial Weather StatementJAN42 min
Feb 9, 8:44 AM CSTRiver Flood WarningJAN38 days
Feb 10, 2:52 PM CSTSpecial Weather StatementJAN23 min
Feb 10, 4:33 PM CSTMesoscale DiscussionSPC87 min
Feb 25, 5:04 AM CSTDense Fog AdvisoryJAN4 hr
Mar 3, 2:38 PM CSTFlash Flood WatchJAN39 hr
Mar 4, 1:19 AM CSTMesoscale DiscussionSPC2 hr
Mar 4, 1:53 AM CSTTornado WatchSPC8 hr
Mar 4, 10:50 AM CSTMesoscale DiscussionSPC115 min
Mar 4, 5:05 PM CSTMesoscale DiscussionSPC2 hr
Mar 11, 2:31 AM CDTDense Fog AdvisoryJAN6 hr
Mar 31, 7:53 AM CDTMesoscale DiscussionSPC2 hr
Apr 11, 3:44 PM CDTWind AdvisoryJAN30 hr
Apr 12, 1:02 PM CDTMesoscale DiscussionSPC118 min
Apr 12, 1:24 PM CDTTornado WatchSPC9 hr
Apr 12, 3:38 PM CDTMesoscale DiscussionSPC97 min
Apr 12, 3:39 PM CDTTornado Warning EmergencyJAN66 min
Apr 12, 3:52 PM CDTMesoscale DiscussionSPC23 min
Apr 12, 4:28 PM CDTTornado Warning EmergencyJAN47 min
Apr 18, 11:30 AM CDTRiver Flood WarningJAN15 days
Apr 18, 9:22 PM CDTSpecial Weather StatementJAN23 min
Apr 19, 11:06 AM CDTMesoscale DiscussionSPC54 min
Apr 19, 11:45 AM CDTTornado WatchSPC9 hr
Apr 19, 6:37 PM CDTMesoscale DiscussionSPC53 min
Apr 19, 6:55 PM CDTTornado WarningJAN65 min
Apr 19, 7:39 PM CDTSpecial Weather StatementLIX36 min
Apr 19, 7:40 PM CDTSevere Thunderstorm WarningJAN35 min
Apr 19, 8:04 PM CDTFlash Flood WarningJAN3 hr
Apr 22, 6:47 PM CDTMesoscale DiscussionSPC88 min
Apr 22, 9:47 PM CDTTornado WatchSPC9 hr
Apr 23, 2:28 AM CDTMesoscale DiscussionSPC92 min
Apr 23, 3:45 AM CDTSevere Thunderstorm WarningJAN48 min
Apr 23, 3:57 AM CDTTornado WarningJAN31 min
Apr 23, 1:37 PM CDTMesoscale DiscussionSPC113 min
May 6, 10:26 AM CDTRed Flag WarningJAN9 hr
May 8, 9:30 AM CDTMesoscale DiscussionSPC2 hr
May 17, 12:54 PM CDTMesoscale DiscussionSPC2 hr
May 23, 2:11 PM CDTSpecial Weather StatementJAN34 min
May 24, 3:56 PM CDTSpecial Weather StatementJAN34 min
May 27, 12:16 PM CDTMesoscale DiscussionSPC89 min
May 27, 2:36 PM CDTMesoscale DiscussionSPC84 min
May 27, 3:57 PM CDTSevere Thunderstorm WarningJAN28 min
May 27, 4:25 PM CDTSevere Thunderstorm WarningJAN35 min
Jun 3, 3:26 PM CDTSpecial Weather StatementLIX34 min
Jun 5, 8:01 PM CDTSevere Thunderstorm WarningJAN74 min
Jun 6, 4:24 PM CDTFlash Flood WatchJAN57 hr
Jun 7, 11:26 AM CDTWind AdvisoryJAN22 hr
Jun 7, 2:15 PM CDTSpecial Weather StatementJAN60 min
Jun 7, 8:32 PM CDTRiver Flood WarningJAN5 days
Jun 14, 4:32 PM CDTSpecial Weather StatementJAN28 min
Jun 14, 5:04 PM CDTSpecial Weather StatementJAN26 min
Jun 23, 5:01 PM CDTSpecial Weather StatementJAN29 min
Jun 24, 6:08 AM CDTMesoscale DiscussionSPC2 hr
Jun 24, 7:31 AM CDTTornado WarningJAN28 min
Jun 25, 3:43 PM CDTMesoscale DiscussionSPC62 min
Jun 25, 5:01 PM CDTSevere Thunderstorm WarningJAN74 min
Jul 4, 4:13 PM CDTSpecial Weather StatementJAN32 min
Jul 4, 5:28 PM CDTFlash Flood WarningJAN2 hr
Jul 8, 2:59 PM CDTSpecial Weather StatementJAN46 min
Jul 8, 3:15 PM CDTSevere Thunderstorm WarningJAN60 min
Jul 8, 3:31 PM CDTFlash Flood WarningJAN102 min
Jul 10, 2:38 AM CDTHeat AdvisoryJAN16 hr
Jul 10, 3:19 PM CDTHeat AdvisoryJAN28 hr
Jul 11, 2:32 PM CDTHeat AdvisoryJAN28 hr
Jul 12, 2:51 PM CDTHeat AdvisoryJAN28 hr
Jul 13, 2:58 PM CDTHeat AdvisoryJAN28 hr
Jul 15, 12:24 PM CDTMesoscale DiscussionSPC96 min
Jul 26, 3:00 PM CDTSpecial Weather StatementJAN30 min
Aug 14, 2:08 PM CDTSpecial Weather StatementJAN67 min
Aug 15, 12:56 PM CDTSpecial Weather StatementJAN19 min
Aug 16, 7:25 PM CDTSevere Thunderstorm WarningJAN50 min
Aug 16, 7:48 PM CDTSevere Thunderstorm WarningJAN42 min
Aug 20, 12:24 AM CDTFlash Flood WarningJAN76 min
Aug 27, 6:36 AM CDTMesoscale DiscussionSPC114 min
Aug 27, 7:47 AM CDTTornado WatchSPC8 hr
Aug 27, 11:10 AM CDTMesoscale DiscussionSPC2 hr
Sep 13, 2:32 AM CDTFlash Flood WatchJAN66 hr
Sep 13, 4:15 PM CDTTropical Storm WatchJAN42 hr
Sep 13, 10:45 PM CDTTropical Storm WarningJAN36 hr
Sep 27, 4:02 AM CDTDense Fog AdvisoryJAN6 hr
Oct 9, 4:20 AM CDTWind AdvisoryJAN33 hr
Oct 9, 3:50 PM CDTMesoscale DiscussionSPC85 min
Oct 19, 7:09 PM CDTDense Fog AdvisoryJAN14 hr
Oct 27, 4:25 AM CDTTropical Storm WarningJAN43 hr
Oct 27, 2:23 PM CDTFlash Flood WatchJAN33 hr
Nov 25, 10:55 AM CSTSpecial Weather StatementJAN35 min
Nov 25, 11:13 AM CSTSpecial Weather StatementJAN32 min
Nov 27, 1:00 PM CSTMesoscale DiscussionSPC3 hr
Nov 30, 2:07 PM CSTFreeze WarningJAN19 hr
Dec 10, 2:27 PM CSTDense Fog AdvisoryJAN19 hr
Dec 12, 8:58 PM CSTDense Fog AdvisoryJAN12 hr
Dec 13, 6:26 PM CSTMesoscale DiscussionSPC94 min
Dec 13, 9:06 PM CSTMesoscale DiscussionSPC114 min
Dec 13, 9:39 PM CSTSpecial Weather StatementJAN51 min
Dec 20, 7:57 PM CSTDense Fog AdvisoryJAN13 hr
Dec 23, 10:51 PM CSTMesoscale DiscussionSPC114 min
Dec 29, 7:38 AM CSTDense Fog AdvisoryJAN95 min
Dec 31, 3:30 PM CSTMesoscale DiscussionSPC2 hr

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 archive20192021

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.