Weather alerts in Henry County, Iowa, 2023

108 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Henry County and its neighbors

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

Alerts: 108
Warnings: 31
Watches: 17
Advisories: 27
Busiest month: April21 alerts
Busiest day: May 7, 202314 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 1 tornado warnings covering Henry County in 2023 had a tornado report inside them.

Henry County, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	0	100%	0
Severe thunderstorm warnings	19	12	37%	11	82%	16 min
Flash flood warnings	1	0	100%	0

Each office's whole area, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Quad Cities, IA: tornado warnings	62	26	58%	67	67%	15 min
NWS Quad Cities, IA: severe thunderstorm warnings	233	149	36%	582	87%	25 min
NWS Quad Cities, IA: flash flood warnings	15	3	80%	10	80%	170 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
Jan 1, 5:13 PM CST	Dense Fog Advisory	DVN	25 hr
Jan 3, 5:14 AM CST	Dense Fog Advisory	DVN	17 hr
Jan 19, 7:44 AM CST	Dense Fog Advisory	DVN	3 hr
Jan 24, 1:54 AM CST	Winter Weather Advisory	DVN	36 hr
Feb 8, 2:45 PM CST	Winter Weather Advisory	DVN	26 hr
Feb 9, 2:58 AM CST	Mesoscale Discussion	SPC	5 hr
Feb 9, 9:48 AM CST	Mesoscale Discussion	SPC	4 hr
Feb 13, 1:51 PM CST	Wind Advisory	DVN	29 hr
Feb 14, 2:08 PM CST	Winter Storm Watch	DVN	13 hr
Feb 15, 3:18 AM CST	Winter Storm Warning	DVN	42 hr
Feb 15, 3:18 AM CST	Winter Weather Advisory	DVN	42 hr
Mar 4, 10:26 PM CST	Dense Fog Advisory	DVN	9 hr
Mar 31, 3:11 AM CDT	Wind Advisory	DVN	34 hr
Mar 31, 10:37 AM CDT	Mesoscale Discussion	SPC	53 min
Mar 31, 11:24 AM CDT	Mesoscale Discussion	SPC	96 min
Mar 31, 11:46 AM CDT	Tornado Watch PDS	SPC	8 hr
Mar 31, 2:07 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	38 min
Mar 31, 3:17 PM CDT	Mesoscale Discussion	SPC	88 min
Mar 31, 4:45 PM CDT	Tornado Warning	DVN	45 min
Mar 31, 5:18 PM CDT	Mesoscale Discussion	SPC	117 min
Mar 31, 5:22 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	38 min
Mar 31, 5:24 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	51 min
Mar 31, 5:30 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 4, 1:49 PM CDT	Mesoscale Discussion	SPC	116 min
Apr 4, 2:48 PM CDT	Tornado Watch	SPC	7 hr
Apr 4, 6:18 PM CDT	Mesoscale Discussion	SPC	87 min
Apr 4, 9:58 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 5, 3:10 AM CDT	Special Weather Statement	DVN	35 min
Apr 5, 3:23 AM CDT	Severe Thunderstorm Warning	DVN	37 min
Apr 12, 2:48 AM CDT	Red Flag Warning	DVN	17 hr
Apr 12, 2:27 PM CDT	Red Flag Warning	DVN	30 hr
Apr 15, 3:17 PM CDT	Wind Advisory	DVN	48 hr
Apr 15, 6:30 PM CDT	Special Weather Statement	DVN	45 min
Apr 17, 3:00 PM CDT	Freeze Warning	DVN	17 hr
Apr 20, 8:24 AM CDT	Special Weather Statement	DVN	36 min
Apr 20, 1:45 PM CDT	Special Weather Statement	DVN	30 min
Apr 20, 1:57 PM CDT	Severe Thunderstorm Warning	DVN	48 min
Apr 20, 2:06 PM CDT	Tornado Watch	SPC	6 hr
Apr 21, 3:01 AM CDT	Freeze Watch	DVN	48 hr
Apr 21, 1:51 PM CDT	Freeze Warning	DVN	19 hr
Apr 22, 3:03 PM CDT	Freeze Warning	DVN	17 hr
Apr 23, 2:50 AM CDT	Freeze Warning	DVN	29 hr
Apr 25, 1:32 PM CDT	Frost Advisory	DVN	18 hr
Apr 30, 2:33 AM CDT	Wind Advisory	DVN	17 hr
May 1, 8:52 AM CDT	Wind Advisory	DVN	10 hr
May 6, 8:12 PM CDT	Mesoscale Discussion	SPC	93 min
May 6, 8:50 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 6, 8:54 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	40 min
May 6, 10:38 PM CDT	Severe Thunderstorm Warning	DVN	52 min
May 6, 11:34 PM CDT	Mesoscale Discussion	SPC	86 min
May 7, 12:19 AM CDT	Severe Thunderstorm Warning	DVN	41 min
May 7, 1:08 AM CDT	Flash Flood Warning	DVN	3 hr
May 7, 1:37 AM CDT	Mesoscale Discussion	SPC	113 min
May 7, 2:10 PM CDT	Mesoscale Discussion	SPC	2 hr
May 7, 4:10 PM CDT	Severe Thunderstorm Watch	SPC	10 hr
May 7, 4:32 PM CDT	Severe Thunderstorm Warning	DVN	43 min
May 7, 5:35 PM CDT	Mesoscale Discussion	SPC	85 min
May 7, 6:25 PM CDT	Severe Thunderstorm Warning	DVN	35 min
May 7, 6:52 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	38 min
May 7, 7:06 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	24 min
May 7, 7:27 PM CDT	Severe Thunderstorm Warning	DVN	33 min
May 13, 12:01 PM CDT	Mesoscale Discussion	SPC	119 min
May 13, 12:54 PM CDT	Tornado Watch	SPC	7 hr
Jun 2, 3:41 PM CDT	Special Weather Statement	DVN	34 min
Jun 4, 2:45 PM CDT	Severe Thunderstorm Warning	DVN	45 min
Jun 4, 3:27 PM CDT	Severe Thunderstorm Warning	DVN	36 min
Jun 18, 11:32 AM CDT	Special Weather Statement	DVN	58 min
Jun 24, 5:45 PM CDT	Mesoscale Discussion	SPC	90 min
Jun 24, 6:28 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 24, 6:43 PM CDT	Severe Thunderstorm Warning	DVN	47 min
Jun 24, 8:52 PM CDT	Mesoscale Discussion	SPC	83 min
Jun 29, 5:49 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 29, 10:10 AM CDT	Severe Thunderstorm Warning	DVN	50 min
Jun 29, 10:57 AM CDT	Severe Thunderstorm Warning	DVN	33 min
Jun 30, 3:45 AM CDT	Dense Fog Advisory	DVN	4 hr
Jun 30, 7:24 AM CDT	Mesoscale Discussion	SPC	96 min
Jun 30, 9:42 AM CDT	Special Weather Statement	DVN	63 min
Jul 12, 5:15 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 14, 2:38 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 14, 3:52 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 17, 10:07 AM CDT	Special Weather Statement	DVN	53 min
Jul 17, 11:40 AM CDT	Severe Thunderstorm Warning	DVN	33 min
Jul 25, 1:54 PM CDT	Heat Advisory	DVN	3 days
Jul 27, 3:59 AM CDT	Excessive Heat Warning	DVN	41 hr
Jul 28, 7:21 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 28, 7:30 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 2, 9:41 PM CDT	Dense Fog Advisory	DVN	11 hr
Aug 6, 3:16 PM CDT	Tornado Watch	SPC	9 hr
Aug 6, 6:01 PM CDT	Mesoscale Discussion	SPC	119 min
Aug 9, 11:23 PM CDT	Dense Fog Advisory	DVN	10 hr
Aug 11, 5:24 AM CDT	Special Weather Statement	DVN	66 min
Aug 18, 2:58 AM CDT	Excessive Heat Watch	DVN	72 hr
Aug 19, 3:01 AM CDT	Excessive Heat Warning	DVN	7 days
Aug 21, 2:46 AM CDT	Excessive Heat Watch	DVN	24 hr
Sep 12, 2:05 AM CDT	Dense Fog Advisory	DVN	6 hr
Sep 28, 3:59 AM CDT	Dense Fog Advisory	DVN	6 hr
Oct 9, 1:52 PM CDT	Frost Advisory	DVN	19 hr
Oct 13, 3:26 PM CDT	Mesoscale Discussion	SPC	94 min
Oct 13, 5:07 PM CDT	Special Weather Statement	DVN	53 min
Oct 13, 5:19 PM CDT	Mesoscale Discussion	SPC	86 min
Oct 29, 2:38 AM CDT	Freeze Warning	DVN	31 hr
Nov 25, 3:21 AM CST	Winter Weather Advisory	DVN	33 hr
Nov 30, 2:37 AM CST	Winter Weather Advisory	DVN	28 hr
Dec 3, 2:30 AM CST	Dense Fog Advisory	DVN	7 hr
Dec 17, 1:35 PM CST	Wind Advisory	DVN	19 hr
Dec 22, 6:23 PM CST	Dense Fog Advisory	DVN	18 hr
Dec 23, 4:15 PM CST	Dense Fog Advisory	DVN	20 hr
Dec 30, 5:56 PM CST	Winter Weather Advisory	DVN	18 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

Product	Alerts
Severe storms
Severe Thunderstorm Warning	19
Tornado Warning	1
Severe Thunderstorm Watch	8
Tornado Watch	5
Mesoscale Discussion	23
Special Weather Statement	10
Flooding
Flash Flood Warning	1
Winter
Winter Storm Warning	1
Winter Storm Watch	1
Winter Weather Advisory	6
Heat
Excessive Heat Warning	2
Excessive Heat Watch	2
Heat Advisory	1
Cold
Freeze Warning	5
Freeze Watch	1
Frost Advisory	2
Wind and dust
Wind Advisory	6
Fire
Red Flag Warning	2
Fog and smoke
Dense Fog Advisory	12

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.