Alert archive / Mississippi / Alcorn County

Weather alerts in Alcorn County, Mississippi, 2020

109 weather alerts in 2020, 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 2020. Tap one for its archive.

Alerts
109
Warnings
22
Watches
18
Advisories
38
Busiest month
March16 alerts
Busiest day
September 13, 20207 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 1 tornado warnings covering Alcorn County in 2020 had a tornado report inside them.

Alcorn County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings110%0
Severe thunderstorm warnings16944%650%17 min
Flash flood warnings330%1100%80 min

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Memphis, TN: tornado warnings652069%4772%10 min
NWS Memphis, TN: severe thunderstorm warnings22113340%42080%25 min
NWS Memphis, TN: flash flood warnings361753%4173%73 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, 3:14 AM CSTFlood WatchMEG57 hr
Jan 9, 3:49 PM CSTFlash Flood WatchMEG47 hr
Jan 10, 3:26 AM CSTWind AdvisoryMEG31 hr
Jan 11, 4:17 AM CSTTornado WatchSPC6 hr
Jan 11, 5:06 AM CSTMesoscale DiscussionSPC54 min
Jan 11, 6:09 AM CSTSevere Thunderstorm WarningMEG51 min
Jan 11, 6:59 AM CSTSevere Thunderstorm WarningMEG46 min
Jan 11, 7:05 AM CSTTornado WarningMEG40 min
Jan 13, 6:18 PM CSTSpecial Weather StatementMEG42 min
Jan 14, 2:46 AM CSTAreal Flood AdvisoryMEG3 hr
Jan 15, 3:11 PM CSTMesoscale DiscussionSPC2 hr
Feb 5, 4:07 PM CSTSevere Thunderstorm WarningMEG38 min
Feb 5, 4:25 PM CSTTornado WatchSPC5 hr
Feb 5, 4:45 PM CSTSevere Thunderstorm WarningMEG30 min
Feb 5, 4:48 PM CSTAreal Flood AdvisoryMEG117 min
Feb 6, 7:27 PM CSTWinter Weather AdvisoryMEG13 hr
Feb 9, 3:05 AM CSTFlood WatchMEG4 days
Feb 12, 3:34 PM CSTSpecial Weather StatementMEG41 min
Feb 12, 8:20 PM CSTAreal Flood WarningMEG6 hr
Mar 3, 12:59 AM CSTSevere Thunderstorm WatchSPC4 hr
Mar 3, 2:34 AM CSTMesoscale DiscussionSPC116 min
Mar 3, 3:55 AM CSTSevere Thunderstorm WarningMEG50 min
Mar 20, 1:00 PM CDTAreal Flood AdvisoryMEG5 hr
Mar 22, 11:24 PM CDTMesoscale DiscussionSPC2 hr
Mar 24, 11:27 AM CDTMesoscale DiscussionSPC2 hr
Mar 24, 2:34 PM CDTMesoscale DiscussionSPC116 min
Mar 24, 3:06 PM CDTTornado WatchSPC7 hr
Mar 28, 4:59 PM CDTMesoscale DiscussionSPC61 min
Mar 28, 6:34 PM CDTTornado WatchSPC7 hr
Mar 28, 8:25 PM CDTMesoscale DiscussionSPC95 min
Mar 28, 8:53 PM CDTSevere Thunderstorm WarningMEG52 min
Mar 28, 9:47 PM CDTSpecial Weather StatementMEG28 min
Mar 28, 10:15 PM CDTSpecial Weather StatementMEG45 min
Mar 28, 10:40 PM CDTSevere Thunderstorm WarningMEG16 min
Mar 28, 11:22 PM CDTSevere Thunderstorm WarningMEG38 min
Apr 8, 11:17 PM CDTSevere Thunderstorm WarningMEG43 min
Apr 8, 11:34 PM CDTSevere Thunderstorm WarningMEG41 min
Apr 8, 11:52 PM CDTSevere Thunderstorm WarningMEG38 min
Apr 9, 12:31 AM CDTSevere Thunderstorm WarningMEG44 min
Apr 9, 1:10 AM CDTMesoscale DiscussionSPC95 min
Apr 10, 3:20 PM CDTFrost AdvisoryMEG16 hr
Apr 12, 3:56 AM CDTFlash Flood WatchMEG20 hr
Apr 12, 3:57 AM CDTWind AdvisoryMEG26 hr
Apr 12, 8:19 PM CDTSevere Thunderstorm WatchSPC4 hr
Apr 12, 9:44 PM CDTMesoscale DiscussionSPC91 min
Apr 12, 10:39 PM CDTSevere Thunderstorm WarningMEG53 min
Apr 12, 10:58 PM CDTSevere Thunderstorm WarningMEG50 min
Apr 12, 11:19 PM CDTMesoscale DiscussionSPC86 min
Apr 13, 6:06 PM CDTFrost AdvisoryMEG39 hr
Apr 15, 3:17 PM CDTFrost AdvisoryMEG18 hr
Apr 24, 5:45 AM CDTDense Fog AdvisoryMEG3 hr
May 4, 2:58 PM CDTSevere Thunderstorm WatchSPC6 hr
May 7, 3:19 PM CDTWind AdvisoryMEG28 hr
May 8, 3:03 AM CDTFrost AdvisoryMEG29 hr
May 17, 7:25 PM CDTAreal Flood AdvisoryMEG3 hr
May 22, 4:29 PM CDTMesoscale DiscussionSPC91 min
May 23, 7:24 PM CDTSpecial Weather StatementMEG51 min
May 24, 3:19 PM CDTSpecial Weather StatementMEG26 min
May 28, 12:18 PM CDTMesoscale DiscussionSPC87 min
Jun 5, 11:03 AM CDTSevere Thunderstorm WatchSPC6 hr
Jun 7, 3:00 PM CDTWind AdvisoryMEG52 hr
Jun 8, 5:28 PM CDTMesoscale DiscussionSPC2 hr
Jun 22, 2:03 PM CDTMesoscale DiscussionSPC117 min
Jun 22, 4:33 PM CDTSpecial Weather StatementMEG57 min
Jun 23, 12:01 PM CDTMesoscale DiscussionSPC2 hr
Jun 25, 3:49 AM CDTDense Fog AdvisoryMEG4 hr
Jul 1, 3:53 AM CDTAreal Flood AdvisoryMEG3 hr
Jul 1, 11:26 AM CDTFlash Flood WatchMEG17 hr
Jul 1, 4:46 PM CDTMesoscale DiscussionSPC119 min
Jul 1, 5:49 PM CDTSpecial Weather StatementMEG26 min
Jul 7, 5:20 PM CDTAreal Flood AdvisoryMEG115 min
Jul 12, 9:38 AM CDTSevere Thunderstorm WarningMEG52 min
Jul 12, 10:18 AM CDTSpecial Weather StatementMEG27 min
Jul 15, 2:23 PM CDTHeat AdvisoryMEG28 hr
Aug 2, 1:21 AM CDTDense Fog AdvisoryMEG8 hr
Aug 9, 3:29 PM CDTHeat AdvisoryMEG28 hr
Aug 15, 3:15 AM CDTDense Fog AdvisoryMEG6 hr
Aug 22, 2:12 AM CDTDense Fog AdvisoryMEG7 hr
Aug 23, 3:00 AM CDTDense Fog AdvisoryMEG7 hr
Aug 27, 1:04 AM CDTFlash Flood WatchMEG51 hr
Aug 28, 10:09 AM CDTMesoscale DiscussionSPC96 min
Aug 28, 10:31 AM CDTTornado WatchSPC5 hr
Aug 28, 3:04 PM CDTAreal Flood AdvisoryMEG3 hr
Aug 28, 5:29 PM CDTSevere Thunderstorm WarningMEG46 min
Aug 28, 6:06 PM CDTSpecial Weather StatementMEG39 min
Aug 28, 7:24 PM CDTSpecial Weather StatementMEG66 min
Aug 28, 7:39 PM CDTAreal Flood AdvisoryMEG4 hr
Aug 30, 1:39 PM CDTMesoscale DiscussionSPC3 hr
Aug 31, 12:16 PM CDTMesoscale DiscussionSPC89 min
Aug 31, 2:05 PM CDTAreal Flood AdvisoryMEG3 hr
Sep 1, 4:59 AM CDTDense Fog AdvisoryMEG4 hr
Sep 12, 2:47 PM CDTAreal Flood AdvisoryMEG118 min
Sep 12, 4:02 PM CDTFlash Flood WarningMEG3 hr
Sep 13, 3:48 AM CDTFlash Flood WatchMEG11 hr
Sep 13, 9:22 AM CDTAreal Flood AdvisoryMEG2 hr
Sep 13, 9:34 AM CDTFlash Flood WarningMEG3 hr
Sep 13, 9:38 AM CDTAreal Flood AdvisoryMEG112 min
Sep 13, 11:13 AM CDTFlash Flood WarningMEG3 hr
Sep 13, 12:08 PM CDTAreal Flood AdvisoryMEG105 min
Sep 13, 12:47 PM CDTAreal Flood AdvisoryMEG66 min
Oct 9, 3:07 AM CDTFlash Flood WatchMEG36 hr
Oct 12, 12:28 AM CDTDense Fog AdvisoryMEG9 hr
Oct 16, 9:42 AM CDTFrost AdvisoryMEG22 hr
Oct 30, 1:34 PM CDTFrost AdvisoryMEG19 hr
Oct 31, 2:45 PM CDTFreeze WatchMEG13 hr
Nov 1, 3:05 AM CSTFreeze WarningMEG30 hr
Nov 14, 7:19 PM CSTWind AdvisoryMEG15 hr
Nov 24, 2:03 PM CSTWind AdvisoryMEG24 hr
Dec 20, 11:15 PM CSTDense Fog AdvisoryMEG10 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.