Severe Thunderstorm Warnings in Clay County, Missouri

725 severe thunderstorm warnings since 1986. An alert counts here when it covered this county. The archive of severe thunderstorm warnings reaches back to 1986.

Clay County and its neighbors

Each county as a circle sized by its count since 1986. Tap one for its archive.

Severe Thunderstorm Warnings: 725
Busiest year: 202456 severe thunderstorm warnings
Average year: 18over 41 years on file

Over time

By year

Before October 2007 these were issued for whole counties, and a storm crossing three counties was often three warnings; since then one polygon follows the storm. The count changed with the practice, not only with the weather.

Warning verification

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

From 2008 to 2025, 88% of hail, wind and damage reports in Clay County fell inside a severe thunderstorm warning issued on average 21 minutes before, and 26% of the severe thunderstorm warnings had no report inside them.

Severe thunderstorm warnings by year

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
2008	31	17	45%	27	78%	16 min
2009	13	10	23%	11	45%	14 min
2010	51	35	31%	44	86%	16 min
2011	34	25	26%	27	93%	21 min
2012	11	9	18%	10	90%	15 min
2013	10	9	10%	8	88%	25 min
2014	27	18	33%	32	94%	23 min
2015	15	12	20%	19	68%	27 min
2016	43	34	21%	34	94%	21 min
2017	28	24	14%	56	84%	18 min
2018	18	10	44%	6	83%	13 min
2019	38	23	39%	22	91%	25 min
2020	14	11	21%	10	90%	33 min
2021	27	18	33%	20	95%	24 min
2022	16	9	44%	5	60%	17 min
2023	23	22	4%	24	96%	16 min
2024	56	46	18%	114	92%	20 min
2025	32	30	6%	71	93%	26 min

Years from 2008, the first full year of storm-based warnings. The year still running is on its own page.

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 latest severe thunderstorm warnings

The most recent on file, newest first.

Issued	Product	Office	Lasted
Sep 6, 8:43 PM CDT	Severe Thunderstorm Warning	EAX	47 min
Sep 6, 8:17 PM CDT	Severe Thunderstorm Warning	EAX	29 min
Sep 6, 8:08 PM CDT	Severe Thunderstorm Warning	EAX	52 min
Aug 19, 1:40 AM CDT	Severe Thunderstorm Warning Considerable damage threat	EAX	50 min
Aug 19, 1:00 AM CDT	Severe Thunderstorm Warning	EAX	45 min
Aug 18, 11:09 PM CDT	Severe Thunderstorm Warning	EAX	36 min
Aug 5, 11:40 PM CDT	Severe Thunderstorm Warning	EAX	50 min
Jul 31, 2:32 AM CDT	Severe Thunderstorm Warning Considerable damage threat	EAX	43 min
Jul 10, 3:23 PM CDT	Severe Thunderstorm Warning	EAX	52 min
Jul 10, 2:39 PM CDT	Severe Thunderstorm Warning	EAX	51 min
Jul 10, 4:42 AM CDT	Severe Thunderstorm Warning	EAX	48 min
Jul 9, 4:05 AM CDT	Severe Thunderstorm Warning	EAX	40 min

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive

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.