Alert archive / Missouri / Knox County

Weather alerts in Knox 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.

Knox County and its neighbors

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

Alerts
77
Warnings
14
Watches
12
Advisories
34
Busiest month
May11 alerts
Busiest day
November 10, 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.

Knox County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings8188%0
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 9, 3:56 PM CSTWinter Storm WatchLSX12 hr
Jan 10, 3:58 AM CSTWinter Storm WarningLSX40 hr
Jan 15, 2:54 PM CSTWinter Storm WatchLSX24 hr
Jan 16, 2:57 PM CSTWinter Weather AdvisoryLSX33 hr
Jan 17, 9:45 AM CSTMesoscale DiscussionSPC6 hr
Jan 17, 4:07 PM CSTMesoscale DiscussionSPC5 hr
Jan 18, 3:26 PM CSTWind Chill AdvisoryLSX20 hr
Jan 21, 3:15 PM CSTWinter Weather AdvisoryLSX3 days
Jan 26, 3:32 AM CSTDense Fog AdvisoryLSX5 hr
Jan 26, 3:09 PM CSTDense Fog AdvisoryLSX21 hr
Feb 4, 2:46 PM CSTWinter Weather AdvisoryLSX45 hr
Feb 11, 3:27 PM CSTWinter Weather AdvisoryLSX36 hr
Feb 12, 3:42 PM CSTWind Chill AdvisoryLSX22 hr
Feb 13, 2:50 PM CSTWind Chill AdvisoryLSX17 hr
Feb 17, 6:10 PM CSTDense Fog AdvisoryLSX7 hr
Feb 24, 3:29 PM CSTWinter Weather AdvisoryLSX44 hr
Feb 25, 3:12 AM CSTWinter Weather AdvisoryLSX27 hr
Mar 4, 2:40 PM CSTFire Weather WatchLSX13 hr
Mar 5, 3:17 AM CSTRed Flag WarningLSX15 hr
Mar 12, 6:05 AM CDTDense Fog AdvisoryLSX4 hr
Mar 19, 2:41 PM CDTMesoscale DiscussionSPC3 hr
Mar 23, 3:09 AM CDTDense Fog AdvisoryLSX7 hr
Mar 25, 3:31 AM CDTDense Fog AdvisoryLSX8 hr
Mar 28, 1:33 PM CDTMesoscale DiscussionSPC117 min
Mar 28, 2:45 PM CDTTornado Watch PDSSPC6 hr
Mar 28, 3:23 PM CDTWind AdvisoryLSX26 hr
Apr 8, 1:46 PM CDTMesoscale DiscussionSPC119 min
Apr 8, 3:08 PM CDTSevere Thunderstorm WatchSPC6 hr
Apr 8, 3:36 PM CDTSevere Thunderstorm WarningLSX39 min
Apr 9, 3:53 AM CDTWind AdvisoryLSX15 hr
Apr 12, 3:15 AM CDTWind AdvisoryLSX31 hr
Apr 13, 3:44 PM CDTFreeze WarningLSX17 hr
Apr 16, 3:03 AM CDTWinter Weather AdvisoryLSX28 hr
Apr 16, 5:43 PM CDTMesoscale DiscussionSPC4 hr
Apr 17, 11:46 AM CDTFreeze WarningLSX20 hr
Apr 28, 3:33 PM CDTMesoscale DiscussionSPC87 min
May 8, 3:32 AM CDTFrost AdvisoryLSX28 hr
May 10, 2:43 PM CDTFrost AdvisoryLSX17 hr
May 14, 3:45 AM CDTFlash Flood WatchLSX25 hr
May 14, 3:55 PM CDTMesoscale DiscussionSPC95 min
May 14, 8:22 PM CDTMesoscale DiscussionSPC113 min
May 14, 10:58 PM CDTMesoscale DiscussionSPC2 hr
May 14, 11:17 PM CDTSevere Thunderstorm WatchSPC5 hr
May 24, 3:54 PM CDTSevere Thunderstorm WarningLSX51 min
May 24, 4:08 PM CDTSevere Thunderstorm WarningLSX52 min
May 24, 5:25 PM CDTAreal Flood AdvisoryLSX3 hr
May 25, 2:15 PM CDTMesoscale DiscussionSPC90 min
Jun 3, 9:52 AM CDTMesoscale DiscussionSPC113 min
Jun 3, 1:45 PM CDTMesoscale DiscussionSPC2 hr
Jun 3, 6:37 PM CDTMesoscale DiscussionSPC113 min
Jun 5, 7:12 AM CDTSevere Thunderstorm WarningLSX32 min
Jun 7, 2:26 PM CDTFlash Flood WatchLSX48 hr
Jun 29, 3:09 AM CDTFlash Flood WatchLSX58 hr
Jul 17, 1:59 AM CDTHeat AdvisoryLSX65 hr
Jul 24, 11:43 AM CDTHeat AdvisoryLSX56 hr
Aug 10, 2:24 PM CDTSevere Thunderstorm WarningLSX52 min
Aug 10, 2:38 PM CDTMesoscale DiscussionSPC2 hr
Aug 28, 2:56 PM CDTMesoscale DiscussionSPC64 min
Sep 11, 2:19 PM CDTFlash Flood WatchLSX20 hr
Oct 4, 3:08 AM CDTFrost AdvisoryLSX29 hr
Oct 15, 3:35 AM CDTFrost AdvisoryLSX29 hr
Oct 16, 2:29 PM CDTWind AdvisoryLSX28 hr
Oct 16, 2:34 PM CDTRed Flag WarningLSX27 hr
Oct 21, 9:34 PM CDTDense Fog AdvisoryLSX10 hr
Oct 23, 4:01 AM CDTFreeze WatchLSX10 hr
Oct 23, 2:25 PM CDTFreeze WarningLSX16 hr
Nov 10, 3:56 AM CSTWind AdvisoryLSX12 hr
Nov 10, 8:52 AM CSTMesoscale DiscussionSPC113 min
Nov 10, 11:03 AM CSTSevere Thunderstorm WarningLSX28 min
Nov 10, 11:22 AM CSTSevere Thunderstorm WatchSPC7 hr
Nov 10, 12:05 PM CSTSevere Thunderstorm WarningLSX25 min
Nov 10, 12:27 PM CSTSevere Thunderstorm WarningLSX25 min
Nov 14, 3:12 AM CSTWind AdvisoryLSX36 hr
Nov 23, 4:14 PM CSTWinter Weather AdvisoryLSX5 hr
Dec 7, 8:40 PM CSTDense Fog AdvisoryLSX13 hr
Dec 23, 3:15 AM CSTWind AdvisoryLSX21 hr
Dec 28, 7:31 PM CSTWinter Weather AdvisoryLSX25 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.