Alert archive / Missouri / Madison County

Weather alerts in Madison County, Missouri, 2020

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

Madison County and its neighbors

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

Alerts
77
Warnings
9
Watches
21
Advisories
23
Busiest month
March16 alerts
Busiest day
January 11, 20203 alerts

Over time

By month

Warning verification

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

Madison County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings4325%1100%2 min
Flash flood warnings00

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS St. Louis, MO: tornado warnings10280%1217%5 min
NWS St. Louis, MO: severe thunderstorm warnings1576956%28079%24 min
NWS St. Louis, MO: flash flood warnings643447%8886%74 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 3, 4:15 AM CSTDense Fog AdvisoryLSX5 hr
Jan 8, 2:31 PM CSTFlash Flood WatchLSX61 hr
Jan 10, 10:40 PM CSTMesoscale DiscussionSPC2 hr
Jan 11, 2:28 AM CSTAreal Flood AdvisoryLSX11 hr
Jan 11, 1:43 PM CSTAreal Flood WarningLSX22 hr
Jan 14, 8:20 PM CSTDense Fog AdvisoryLSX7 hr
Jan 16, 2:57 PM CSTFlood WatchLSX39 hr
Jan 16, 2:57 PM CSTWinter Weather AdvisoryLSX33 hr
Jan 21, 3:15 PM CSTWinter Weather AdvisoryLSX3 days
Jan 28, 3:26 AM CSTWinter Weather AdvisoryLSX34 hr
Feb 4, 2:46 PM CSTWinter Weather AdvisoryLSX45 hr
Feb 24, 12:20 PM CSTMesoscale DiscussionSPC115 min
Mar 2, 3:54 PM CSTMesoscale DiscussionSPC2 hr
Mar 2, 6:39 PM CSTMesoscale DiscussionSPC96 min
Mar 2, 6:51 PM CSTSevere Thunderstorm WarningLSX39 min
Mar 2, 7:22 PM CSTSevere Thunderstorm WarningLSX38 min
Mar 12, 6:05 AM CDTDense Fog AdvisoryLSX4 hr
Mar 12, 2:31 PM CDTMesoscale DiscussionSPC89 min
Mar 12, 3:44 PM CDTTornado WatchSPC7 hr
Mar 19, 3:43 AM CDTFlash Flood WatchLSX21 hr
Mar 19, 11:05 AM CDTMesoscale DiscussionSPC115 min
Mar 19, 3:40 PM CDTMesoscale DiscussionSPC65 min
Mar 27, 5:15 PM CDTMesoscale DiscussionSPC90 min
Mar 27, 5:46 PM CDTSevere Thunderstorm WatchSPC3 hr
Mar 27, 6:56 PM CDTSevere Thunderstorm WarningLSX34 min
Mar 27, 8:02 PM CDTMesoscale DiscussionSPC88 min
Mar 28, 1:17 PM CDTMesoscale DiscussionSPC88 min
Mar 28, 3:53 PM CDTTornado WatchSPC5 hr
Apr 8, 3:45 PM CDTMesoscale DiscussionSPC2 hr
Apr 8, 4:24 PM CDTTornado WatchSPC7 hr
Apr 12, 3:15 AM CDTWind AdvisoryLSX31 hr
Apr 14, 3:21 PM CDTFreeze WarningLSX18 hr
Apr 15, 3:41 PM CDTFrost AdvisoryLSX16 hr
Apr 17, 11:46 AM CDTFrost AdvisoryLSX20 hr
Apr 24, 3:06 AM CDTDense Fog AdvisoryLSX6 hr
Apr 28, 3:51 PM CDTSevere Thunderstorm WatchSPC7 hr
Apr 28, 6:32 PM CDTMesoscale DiscussionSPC118 min
Apr 28, 6:41 PM CDTMesoscale DiscussionSPC64 min
Apr 28, 9:06 PM CDTMesoscale DiscussionSPC84 min
Apr 28, 9:42 PM CDTSevere Thunderstorm WarningLSX48 min
May 3, 11:44 AM CDTSevere Thunderstorm WatchSPC7 hr
May 3, 12:50 PM CDTMesoscale DiscussionSPC85 min
May 4, 2:58 PM CDTSevere Thunderstorm WatchSPC6 hr
May 8, 3:32 AM CDTFrost AdvisoryLSX28 hr
May 10, 2:43 PM CDTFrost AdvisoryLSX17 hr
May 16, 8:58 PM CDTFlash Flood WatchLSX21 hr
Jun 7, 2:26 PM CDTFlash Flood WatchLSX48 hr
Jun 29, 3:09 AM CDTFlash Flood WatchLSX58 hr
Jul 15, 2:10 PM CDTTornado WatchSPC7 hr
Jul 17, 1:59 AM CDTHeat AdvisoryLSX65 hr
Jul 17, 2:46 PM CDTAreal Flood AdvisoryLSX3 hr
Jul 20, 12:42 PM CDTMesoscale DiscussionSPC2 hr
Jul 22, 11:54 AM CDTMesoscale DiscussionSPC2 hr
Jul 29, 2:35 PM CDTFlash Flood WatchLSX33 hr
Jul 31, 3:25 AM CDTFlash Flood WatchLSX21 hr
Aug 8, 2:18 PM CDTFlash Flood WatchLSX20 hr
Aug 9, 1:54 PM CDTHeat AdvisoryLSX29 hr
Aug 9, 5:34 PM CDTMesoscale DiscussionSPC116 min
Aug 10, 2:38 PM CDTMesoscale DiscussionSPC2 hr
Aug 10, 7:29 PM CDTMesoscale DiscussionSPC91 min
Aug 11, 2:53 PM CDTAreal Flood AdvisoryLSX3 hr
Aug 12, 7:03 PM CDTAreal Flood AdvisoryLSX3 hr
Aug 13, 9:49 AM CDTFlash Flood WatchLSX9 hr
Aug 15, 2:00 PM CDTMesoscale DiscussionSPC2 hr
Aug 29, 11:56 AM CDTMesoscale DiscussionSPC94 min
Aug 31, 10:50 AM CDTSevere Thunderstorm WatchSPC3 hr
Aug 31, 12:43 PM CDTMesoscale DiscussionSPC92 min
Sep 3, 3:15 AM CDTDense Fog AdvisoryLSX6 hr
Oct 4, 3:08 AM CDTFrost AdvisoryLSX29 hr
Oct 15, 3:35 AM CDTFrost AdvisoryLSX29 hr
Oct 15, 2:08 PM CDTFreeze WarningLSX19 hr
Oct 16, 4:45 AM CDTFire Weather WatchLSX10 hr
Oct 16, 2:34 PM CDTRed Flag WarningLSX27 hr
Oct 28, 3:01 PM CDTFlood WatchLSX19 hr
Nov 14, 10:32 PM CSTMesoscale DiscussionSPC118 min
Nov 19, 3:25 AM CSTRed Flag WarningLSX14 hr
Dec 13, 2:55 AM CSTWinter Weather AdvisoryLSX17 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.