Alert archive / Mississippi / Union County

Weather alerts in Union County, Mississippi, 2020

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

Union County and its neighbors

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

Alerts
128
Warnings
33
Watches
17
Advisories
40
Busiest month
August23 alerts
Busiest day
January 11, 20208 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 3 tornado warnings covering Union County in 2020 had a tornado report inside them.

Union County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings30100%0
Severe thunderstorm warnings141029%667%20 min
Flash flood warnings7443%0

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 1, 7:00 PM CSTRiver Flood WarningMEG53 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, 5:19 AM CSTSevere Thunderstorm WarningMEG41 min
Jan 11, 5:37 AM CSTSevere Thunderstorm WarningMEG38 min
Jan 11, 5:57 AM CSTSevere Thunderstorm WarningMEG48 min
Jan 11, 6:37 AM CSTSevere Thunderstorm WarningMEG38 min
Jan 11, 9:17 AM CSTFlash Flood WarningMEG4 hr
Jan 11, 11:51 AM CSTRiver Flood WarningMEG23 hr
Jan 14, 2:46 AM CSTAreal Flood AdvisoryMEG3 hr
Jan 14, 3:46 AM CSTAreal Flood AdvisoryMEG3 hr
Jan 15, 3:11 PM CSTMesoscale DiscussionSPC2 hr
Jan 15, 7:33 PM CSTSpecial Weather StatementMEG42 min
Feb 5, 4:07 PM CSTSevere Thunderstorm WarningMEG38 min
Feb 5, 4:25 PM CSTTornado WatchSPC5 hr
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 10, 10:12 AM CSTRiver Flood WarningMEG4 days
Feb 12, 2:51 PM CSTSpecial Weather StatementMEG39 min
Mar 3, 2:52 AM CSTMesoscale DiscussionSPC2 hr
Mar 22, 11:24 PM CDTMesoscale DiscussionSPC2 hr
Mar 23, 12:20 AM CDTSpecial Weather StatementMEG40 min
Mar 23, 1:02 AM CDTSpecial Weather StatementMEG43 min
Mar 23, 1:35 AM CDTSevere Thunderstorm WarningMEG21 min
Mar 23, 2:06 AM CDTSpecial Weather StatementMEG24 min
Mar 23, 11:01 AM CDTRiver Flood WarningMEG11 hr
Mar 24, 6:43 AM CDTAreal Flood AdvisoryMEG3 hr
Mar 24, 12:36 PM CDTRiver Flood WarningMEG8 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, 10:40 PM CDTSevere Thunderstorm WarningMEG16 min
Mar 28, 11:22 PM CDTSevere Thunderstorm WarningMEG38 min
Apr 9, 1:10 AM CDTMesoscale DiscussionSPC95 min
Apr 11, 11:40 AM CDTRiver Flood WarningMEG51 hr
Apr 12, 3:56 AM CDTFlash Flood WatchMEG20 hr
Apr 12, 3:57 AM CDTWind AdvisoryMEG26 hr
Apr 12, 7:09 AM CDTSpecial Weather StatementMEG36 min
Apr 12, 10:41 AM CDTTornado Watch PDSSPC10 hr
Apr 12, 2:41 PM CDTSpecial Weather StatementMEG34 min
Apr 12, 8:19 PM CDTSevere Thunderstorm WatchSPC4 hr
Apr 12, 9:44 PM CDTMesoscale DiscussionSPC91 min
Apr 12, 10:13 PM CDTSevere Thunderstorm WarningMEG47 min
Apr 12, 10:39 PM CDTSevere Thunderstorm WarningMEG53 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
Apr 29, 1:44 AM CDTSpecial Weather StatementMEG31 min
Apr 29, 2:08 AM CDTSpecial Weather StatementMEG67 min
May 7, 3:19 PM CDTWind AdvisoryMEG28 hr
May 17, 12:54 PM CDTMesoscale DiscussionSPC2 hr
May 17, 5:59 PM CDTAreal Flood AdvisoryMEG3 hr
May 17, 7:25 PM CDTAreal Flood AdvisoryMEG3 hr
May 22, 3:12 AM CDTSpecial Weather StatementMEG48 min
May 22, 5:53 AM CDTSpecial Weather StatementMEG52 min
May 28, 12:18 PM CDTMesoscale DiscussionSPC87 min
May 28, 3:06 PM CDTSpecial Weather StatementMEG24 min
Jun 4, 8:26 PM CDTSpecial Weather StatementMEG34 min
Jun 4, 9:02 PM CDTSevere Thunderstorm WarningMEG43 min
Jun 5, 11:03 AM CDTSevere Thunderstorm WatchSPC6 hr
Jun 5, 1:18 PM CDTMesoscale DiscussionSPC87 min
Jun 5, 2:52 PM CDTSevere Thunderstorm WarningMEG38 min
Jun 5, 3:24 PM CDTSevere Thunderstorm WarningMEG81 min
Jun 7, 3:00 PM CDTWind AdvisoryMEG52 hr
Jun 8, 1:09 PM CDTMesoscale DiscussionSPC3 hr
Jun 8, 5:28 PM CDTMesoscale DiscussionSPC2 hr
Jun 8, 5:46 PM CDTAreal Flood AdvisoryMEG59 min
Jun 8, 6:52 PM CDTAreal Flood AdvisoryMEG113 min
Jun 9, 7:00 AM CDTAreal Flood AdvisoryMEG3 hr
Jun 9, 1:13 PM CDTRiver Flood WarningMEG21 hr
Jun 22, 2:03 PM CDTMesoscale DiscussionSPC117 min
Jun 23, 12:01 PM CDTMesoscale DiscussionSPC2 hr
Jun 23, 3:12 PM CDTAreal Flood AdvisoryMEG3 hr
Jun 24, 8:52 AM CDTAreal Flood AdvisoryMEG3 hr
Jun 24, 11:27 AM CDTAreal Flood AdvisoryMEG2 hr
Jun 25, 3:49 AM CDTDense Fog AdvisoryMEG4 hr
Jul 1, 7:07 AM CDTAreal Flood AdvisoryMEG3 hr
Jul 1, 7:36 AM CDTFlash Flood WarningMEG3 hr
Jul 1, 9:16 AM CDTFlash Flood Warning EmergencyCatastrophic damage threatMEG3 hr
Jul 1, 11:26 AM CDTFlash Flood WatchMEG17 hr
Jul 1, 12:18 PM CDTAreal Flood WarningMEG6 hr
Jul 1, 4:46 PM CDTMesoscale DiscussionSPC119 min
Jul 1, 6:27 PM CDTAreal Flood AdvisoryMEG3 hr
Jul 12, 11:03 AM CDTSpecial Weather StatementMEG42 min
Jul 14, 2:47 PM CDTHeat AdvisoryMEG28 hr
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, 6:37 AM CDTTornado WarningMEG25 min
Aug 28, 6:47 AM CDTMesoscale DiscussionSPC88 min
Aug 28, 9:51 AM CDTTornado WarningMEG24 min
Aug 28, 10:09 AM CDTMesoscale DiscussionSPC96 min
Aug 28, 10:14 AM CDTTornado WarningMEG8 min
Aug 28, 10:31 AM CDTTornado WatchSPC5 hr
Aug 28, 7:04 PM CDTSpecial Weather StatementMEG41 min
Aug 28, 7:13 PM CDTSevere Thunderstorm WarningMEG47 min
Aug 28, 8:47 PM CDTAreal Flood AdvisoryMEG116 min
Aug 28, 9:38 PM CDTSpecial Weather StatementMEG37 min
Aug 28, 9:55 PM CDTAreal Flood AdvisoryMEG48 min
Aug 28, 10:43 PM CDTFlash Flood WarningMEG3 hr
Aug 28, 10:43 PM CDTFlash Flood WarningMEG3 hr
Aug 30, 1:39 PM CDTMesoscale DiscussionSPC3 hr
Aug 30, 3:35 PM CDTAreal Flood AdvisoryMEG3 hr
Aug 31, 12:16 PM CDTMesoscale DiscussionSPC89 min
Aug 31, 6:37 PM CDTAreal Flood AdvisoryMEG3 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, 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 10, 3:17 AM CDTWind AdvisoryMEG13 hr
Oct 10, 1:13 PM CDTFlash Flood WarningMEG2 hr
Oct 12, 12:28 AM CDTDense Fog AdvisoryMEG9 hr
Oct 31, 2:45 PM CDTFreeze WatchMEG13 hr
Nov 1, 3:05 AM CSTFreeze WarningMEG30 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.