Alert archive / Illinois / Hancock County / Severe Thunderstorm Warnings

Severe Thunderstorm Warnings in Hancock County, Illinois, 2023

30 severe thunderstorm warnings in 2023. An alert counts here when it covered this county. The archive of severe thunderstorm warnings reaches back to 1986.

Hancock County and its neighbors

Each county as a circle sized by its count in 2023. Tap one for its archive.

Severe Thunderstorm Warnings: 30
Busiest month: May11 severe thunderstorm warnings
Busiest day: May 7, 20238 severe thunderstorm warnings

Over time

By month

Warning verification

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

15 of 30 severe thunderstorm warnings covering Hancock County in 2023 had a qualifying storm report inside them; 25 of 29 hail, wind and damage reports fell inside a warning, on average 34 minutes after it went out.

Hancock County, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Severe thunderstorm warnings	30	15	50%	29	86%	34 min

Each office's whole area, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Quad Cities, IA: severe thunderstorm warnings	233	149	36%	582	87%	25 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.

Issued	Product	Office	Lasted
Mar 31, 1:13 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	47 min
Mar 31, 5:24 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	51 min
Mar 31, 5:56 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	34 min
Apr 4, 5:46 PM CDT	Severe Thunderstorm Warning	DVN	44 min
Apr 4, 6:25 PM CDT	Severe Thunderstorm Warning	DVN	35 min
Apr 5, 3:42 AM CDT	Severe Thunderstorm Warning	DVN	48 min
Apr 15, 5:08 PM CDT	Severe Thunderstorm Warning	DVN	37 min
Apr 15, 5:41 PM CDT	Severe Thunderstorm Warning	DVN	49 min
Apr 15, 6:03 PM CDT	Severe Thunderstorm Warning	DVN	27 min
Apr 15, 6:28 PM CDT	Severe Thunderstorm Warning	DVN	32 min
Apr 20, 2:15 PM CDT	Severe Thunderstorm Warning	DVN	60 min
May 6, 9:38 PM CDT	Severe Thunderstorm Warning	DVN	34 min
May 6, 9:53 PM CDT	Severe Thunderstorm Warning	DVN	52 min
May 6, 10:11 PM CDT	Severe Thunderstorm Warning	DVN	49 min
May 7, 1:48 AM CDT	Severe Thunderstorm Warning	DVN	27 min
May 7, 2:16 AM CDT	Severe Thunderstorm Warning	DVN	44 min
May 7, 4:32 PM CDT	Severe Thunderstorm Warning	DVN	43 min
May 7, 5:10 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	33 min
May 7, 5:42 PM CDT	Severe Thunderstorm Warning	DVN	48 min
May 7, 7:19 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	41 min
May 7, 7:49 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	56 min
May 7, 8:42 PM CDT	Severe Thunderstorm Warning	DVN	33 min
Jun 4, 3:23 PM CDT	Severe Thunderstorm Warning	DVN	52 min
Jun 4, 4:09 PM CDT	Severe Thunderstorm Warning	DVN	27 min
Jun 29, 10:08 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	52 min
Jun 29, 10:46 AM CDT	Severe Thunderstorm Warning Destructive damage threat	DVN	59 min
Jun 30, 10:16 AM CDT	Severe Thunderstorm Warning	DVN	44 min
Jul 5, 1:36 PM CDT	Severe Thunderstorm Warning	DVN	39 min
Aug 12, 12:29 AM CDT	Severe Thunderstorm Warning	DVN	31 min
Aug 12, 1:07 AM CDT	Severe Thunderstorm Warning	DVN	38 min

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2022 2024

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.