Weather alerts in Henry County, Iowa, 2010

229 weather alerts in 2010, 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 2010. Tap one for its archive.

Alerts: 229
Warnings: 53
Watches: 54
Advisories: 46
Busiest month: June67 alerts
Busiest day: April 30, 20108 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 2010 had a tornado report inside them.

Henry County, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	0	100%	0
Severe thunderstorm warnings	21	10	52%	4	100%	34 min
Flash flood warnings	9	8	11%	2	50%	252 min

Each office's whole area, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Quad Cities, IA: tornado warnings	22	5	77%	15	67%	20 min
NWS Quad Cities, IA: severe thunderstorm warnings	182	124	32%	422	80%	24 min
NWS Quad Cities, IA: flash flood warnings	61	52	15%	163	90%	135 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, 2:15 PM CST	Wind Chill Advisory	DVN	25 hr
Jan 2, 2:38 PM CST	Wind Chill Advisory	DVN	21 hr
Jan 3, 2:44 PM CST	Wind Chill Advisory	DVN	20 hr
Jan 4, 2:20 PM CST	Wind Chill Advisory	DVN	20 hr
Jan 5, 11:11 AM CST	Winter Storm Watch	DVN	16 hr
Jan 6, 3:20 AM CST	Winter Storm Warning	DVN	42 hr
Jan 7, 9:09 PM CST	Winter Weather Advisory	DVN	7 hr
Jan 8, 3:44 AM CST	Wind Chill Advisory	DVN	32 hr
Jan 9, 2:51 PM CST	Wind Chill Advisory	DVN	18 hr
Jan 16, 10:42 PM CST	Dense Fog Advisory	DVN	13 hr
Jan 17, 3:51 PM CST	Dense Fog Advisory	DVN	44 hr
Jan 19, 3:27 PM CST	Freezing Rain Advisory	DVN	45 hr
Jan 20, 3:58 AM CST	Mesoscale Discussion	SPC	4 hr
Jan 20, 9:47 AM CST	Ice Storm Warning	DVN	6 hr
Jan 23, 9:07 PM CST	Dense Fog Advisory	DVN	11 hr
Jan 24, 7:05 AM CST	River Flood Warning	DVN	8 days
Jan 25, 1:58 PM CST	Winter Weather Advisory	DVN	19 hr
Feb 7, 3:10 AM CST	Winter Storm Watch	DVN	25 hr
Feb 8, 3:53 AM CST	Winter Weather Advisory	DVN	41 hr
Feb 8, 3:15 PM CST	Winter Storm Warning	DVN	19 hr
Feb 12, 9:22 PM CST	Dense Fog Advisory	DVN	12 hr
Feb 20, 4:25 AM CST	Winter Storm Watch	DVN	11 hr
Feb 20, 3:51 PM CST	Winter Storm Warning	DVN	36 hr
Mar 8, 2:31 AM CST	Dense Fog Advisory	DVN	8 hr
Mar 8, 4:31 AM CST	River Flood Warning	DVN	12 days
Mar 8, 8:56 PM CST	Dense Fog Advisory	DVN	14 hr
Mar 18, 5:07 AM CDT	Dense Fog Advisory	DVN	6 hr
Mar 19, 3:57 PM CDT	Winter Weather Advisory	DVN	38 hr
Apr 2, 8:28 AM CDT	Mesoscale Discussion	SPC	92 min
Apr 2, 11:35 AM CDT	Mesoscale Discussion	SPC	85 min
Apr 4, 3:34 PM CDT	Tornado Watch	SPC	8 hr
Apr 4, 6:23 PM CDT	Mesoscale Discussion	SPC	67 min
Apr 4, 7:25 PM CDT	Special Weather Statement	DVN	50 min
Apr 5, 1:29 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 5, 4:04 PM CDT	Mesoscale Discussion	SPC	56 min
Apr 6, 8:46 PM CDT	Mesoscale Discussion	SPC	59 min
Apr 6, 9:28 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 22, 6:15 AM CDT	Dense Fog Advisory	DVN	3 hr
Apr 24, 6:21 PM CDT	Special Weather Statement	DVN	114 min
Apr 24, 8:21 PM CDT	Special Weather Statement	DVN	114 min
Apr 24, 8:43 PM CDT	River Flood Warning	DVN	49 hr
Apr 29, 3:16 AM CDT	Wind Advisory	DVN	12 hr
Apr 30, 9:18 AM CDT	Mesoscale Discussion	SPC	57 min
Apr 30, 10:20 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Apr 30, 12:16 PM CDT	Severe Thunderstorm Warning	DVN	59 min
Apr 30, 1:05 PM CDT	Tornado Watch	SPC	9 hr
Apr 30, 1:06 PM CDT	Severe Thunderstorm Warning	DVN	54 min
Apr 30, 1:22 PM CDT	Mesoscale Discussion	SPC	53 min
Apr 30, 2:41 PM CDT	Mesoscale Discussion	SPC	64 min
Apr 30, 3:00 PM CDT	Severe Thunderstorm Warning	DVN	40 min
May 2, 3:10 PM CDT	Special Weather Statement	DVN	3 hr
May 7, 2:31 AM CDT	Mesoscale Discussion	SPC	59 min
May 8, 3:40 AM CDT	Frost Advisory	DVN	28 hr
May 10, 3:09 PM CDT	Flash Flood Watch	DVN	13 hr
May 11, 9:52 AM CDT	River Flood Warning	DVN	7 days
May 12, 3:47 AM CDT	Flash Flood Watch	DVN	32 hr
May 12, 8:00 PM CDT	Mesoscale Discussion	SPC	90 min
May 12, 9:31 PM CDT	Special Weather Statement	DVN	59 min
May 12, 10:43 PM CDT	Flash Flood Warning	DVN	8 hr
May 12, 11:24 PM CDT	Mesoscale Discussion	SPC	96 min
May 12, 11:58 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 13, 6:22 AM CDT	Areal Flood Warning	DVN	15 hr
May 21, 11:25 PM CDT	Dense Fog Advisory	DVN	10 hr
May 25, 3:08 PM CDT	Flash Flood Watch	DVN	24 hr
Jun 1, 3:33 PM CDT	Flash Flood Watch	DVN	23 hr
Jun 1, 6:25 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 1, 7:21 PM CDT	Severe Thunderstorm Warning	DVN	54 min
Jun 1, 8:13 PM CDT	Severe Thunderstorm Warning	DVN	62 min
Jun 1, 9:17 PM CDT	Mesoscale Discussion	SPC	118 min
Jun 1, 10:07 PM CDT	Severe Thunderstorm Warning	DVN	53 min
Jun 1, 11:06 PM CDT	Severe Thunderstorm Warning	DVN	69 min
Jun 1, 11:36 PM CDT	Mesoscale Discussion	SPC	54 min
Jun 2, 7:19 AM CDT	River Flood Warning	DVN	13 hr
Jun 4, 1:43 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 4, 2:25 PM CDT	Flash Flood Watch	DVN	32 hr
Jun 4, 3:54 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 4, 4:55 PM CDT	Special Weather Statement	DVN	110 min
Jun 5, 12:06 AM CDT	Severe Thunderstorm Warning	DVN	36 min
Jun 5, 4:00 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 5, 6:52 AM CDT	Mesoscale Discussion	SPC	83 min
Jun 5, 9:15 AM CDT	River Flood Warning	DVN	12 hr
Jun 5, 2:31 PM CDT	Mesoscale Discussion	SPC	119 min
Jun 5, 3:50 PM CDT	Tornado Watch	SPC	7 hr
Jun 7, 3:52 AM CDT	Flash Flood Watch	DVN	40 hr
Jun 8, 10:32 AM CDT	River Flood Warning	DVN	11 hr
Jun 10, 3:26 PM CDT	Special Weather Statement	DVN	79 min
Jun 12, 9:39 AM CDT	Flash Flood Watch	DVN	11 hr
Jun 12, 11:05 AM CDT	Flash Flood Warning	DVN	8 hr
Jun 12, 1:28 PM CDT	River Flood Warning	DVN	16 days
Jun 13, 4:05 AM CDT	Flash Flood Watch	DVN	32 hr
Jun 13, 8:31 AM CDT	Special Weather Statement	DVN	119 min
Jun 13, 10:13 AM CDT	Special Weather Statement	DVN	3 hr
Jun 17, 10:57 PM CDT	Mesoscale Discussion	SPC	93 min
Jun 18, 2:33 AM CDT	Mesoscale Discussion	SPC	27 min
Jun 18, 9:06 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 18, 10:41 AM CDT	Mesoscale Discussion	SPC	2 hr
Jun 18, 12:29 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 18, 12:59 PM CDT	Severe Thunderstorm Warning	DVN	61 min
Jun 18, 5:45 PM CDT	Mesoscale Discussion	SPC	60 min
Jun 18, 7:32 PM CDT	Severe Thunderstorm Warning	DVN	43 min
Jun 18, 7:38 PM CDT	Mesoscale Discussion	SPC	97 min
Jun 18, 8:05 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 18, 8:41 PM CDT	Severe Thunderstorm Warning	DVN	49 min
Jun 19, 3:26 AM CDT	Flash Flood Watch	DVN	60 hr
Jun 19, 11:13 PM CDT	Mesoscale Discussion	SPC	92 min
Jun 20, 1:58 AM CDT	Special Weather Statement	DVN	92 min
Jun 21, 4:10 PM CDT	Mesoscale Discussion	SPC	35 min
Jun 21, 4:12 PM CDT	Severe Thunderstorm Warning	DVN	63 min
Jun 21, 4:26 PM CDT	Tornado Warning	DVN	49 min
Jun 21, 4:36 PM CDT	Tornado Watch	SPC	5 hr
Jun 21, 5:23 PM CDT	Flash Flood Warning	DVN	4 hr
Jun 21, 7:00 PM CDT	Mesoscale Discussion	SPC	60 min
Jun 21, 7:05 PM CDT	Severe Thunderstorm Warning	DVN	55 min
Jun 21, 7:16 PM CDT	Flash Flood Watch	DVN	49 hr
Jun 21, 8:48 PM CDT	Flash Flood Warning	DVN	5 hr
Jun 22, 4:03 AM CDT	Mesoscale Discussion	SPC	57 min
Jun 22, 5:30 AM CDT	Special Weather Statement	DVN	90 min
Jun 22, 10:04 AM CDT	Areal Flood Warning	DVN	21 hr
Jun 23, 4:34 AM CDT	Heat Advisory	DVN	13 hr
Jun 23, 7:29 AM CDT	Flash Flood Warning	DVN	5 hr
Jun 23, 1:01 PM CDT	Mesoscale Discussion	SPC	59 min
Jun 23, 2:10 PM CDT	Tornado Watch	SPC	7 hr
Jun 23, 3:48 PM CDT	Severe Thunderstorm Warning	DVN	57 min
Jun 23, 4:53 PM CDT	Severe Thunderstorm Warning	DVN	67 min
Jun 25, 3:41 PM CDT	Heat Advisory	DVN	20 hr
Jun 26, 1:25 AM CDT	Special Weather Statement	DVN	50 min
Jun 26, 1:52 AM CDT	Mesoscale Discussion	SPC	83 min
Jun 26, 1:56 AM CDT	Special Weather Statement	DVN	64 min
Jun 27, 2:52 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 27, 5:58 AM CDT	Mesoscale Discussion	SPC	92 min
Jun 27, 6:23 AM CDT	Special Weather Statement	DVN	67 min
Jul 3, 3:55 PM CDT	Flash Flood Watch	DVN	12 hr
Jul 5, 4:31 AM CDT	River Flood Warning	DVN	4 days
Jul 5, 3:30 PM CDT	Flash Flood Watch	DVN	14 hr
Jul 6, 5:01 PM CDT	Special Weather Statement	DVN	44 min
Jul 7, 3:17 AM CDT	Special Weather Statement	DVN	88 min
Jul 7, 12:52 PM CDT	Flash Flood Watch	DVN	14 hr
Jul 13, 3:22 PM CDT	Heat Advisory	DVN	30 hr
Jul 16, 3:45 PM CDT	Heat Advisory	DVN	27 hr
Jul 18, 3:05 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 18, 5:58 AM CDT	Mesoscale Discussion	SPC	32 min
Jul 18, 6:09 AM CDT	Severe Thunderstorm Warning	DVN	96 min
Jul 18, 6:18 AM CDT	Special Weather Statement	DVN	87 min
Jul 19, 10:01 AM CDT	Flash Flood Watch	DVN	41 hr
Jul 19, 7:21 PM CDT	Mesoscale Discussion	SPC	84 min
Jul 19, 7:44 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 19, 8:25 PM CDT	Flash Flood Warning	DVN	6 hr
Jul 19, 8:58 PM CDT	River Flood Warning	DVN	32 hr
Jul 19, 11:02 PM CDT	Mesoscale Discussion	SPC	88 min
Jul 20, 12:55 AM CDT	Flash Flood Warning	DVN	8 hr
Jul 22, 3:34 AM CDT	Heat Advisory	DVN	40 hr
Jul 22, 3:32 PM CDT	Flash Flood Watch	DVN	45 hr
Jul 23, 2:30 PM CDT	Mesoscale Discussion	SPC	90 min
Jul 23, 5:19 PM CDT	Mesoscale Discussion	SPC	86 min
Jul 23, 10:02 PM CDT	River Flood Warning	DVN	8 hr
Jul 24, 4:30 AM CDT	Special Weather Statement	DVN	90 min
Jul 24, 1:53 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 24, 3:37 PM CDT	Mesoscale Discussion	SPC	83 min
Jul 27, 1:38 PM CDT	Heat Advisory	DVN	7 hr
Jul 28, 2:23 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 31, 3:25 AM CDT	Dense Fog Advisory	DVN	6 hr
Aug 2, 3:24 PM CDT	Flash Flood Watch	DVN	18 hr
Aug 3, 12:17 PM CDT	Heat Advisory	DVN	9 hr
Aug 3, 8:44 PM CDT	Flash Flood Watch	DVN	14 hr
Aug 4, 1:05 AM CDT	Mesoscale Discussion	SPC	85 min
Aug 4, 1:57 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 4, 2:11 AM CDT	Special Weather Statement	DVN	64 min
Aug 4, 2:57 AM CDT	Special Weather Statement	DVN	63 min
Aug 5, 3:32 AM CDT	Dense Fog Advisory	DVN	3 hr
Aug 8, 4:10 AM CDT	Heat Advisory	DVN	15 hr
Aug 8, 10:08 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 9, 2:20 AM CDT	Mesoscale Discussion	SPC	100 min
Aug 9, 3:51 AM CDT	Flash Flood Watch	DVN	17 hr
Aug 9, 4:46 AM CDT	Mesoscale Discussion	SPC	3 hr
Aug 9, 4:52 AM CDT	Special Weather Statement	DVN	83 min
Aug 9, 12:03 PM CDT	Heat Advisory	DVN	8 hr
Aug 10, 4:30 AM CDT	Heat Advisory	DVN	35 hr
Aug 10, 9:44 AM CDT	River Flood Warning	DVN	15 days
Aug 10, 6:10 PM CDT	Special Weather Statement	DVN	65 min
Aug 10, 6:42 PM CDT	Flash Flood Warning	DVN	3 hr
Aug 11, 3:14 PM CDT	Excessive Heat Warning	DVN	50 hr
Aug 13, 3:42 AM CDT	Flash Flood Watch	DVN	24 hr
Aug 13, 10:36 AM CDT	Mesoscale Discussion	SPC	84 min
Aug 13, 1:54 PM CDT	Mesoscale Discussion	SPC	66 min
Aug 13, 2:14 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 13, 8:49 PM CDT	Flash Flood Warning	DVN	6 hr
Aug 13, 9:43 PM CDT	Severe Thunderstorm Warning	DVN	22 min
Aug 20, 11:35 AM CDT	Flash Flood Watch	DVN	9 hr
Aug 20, 1:58 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 20, 4:59 PM CDT	Severe Thunderstorm Warning	DVN	61 min
Aug 20, 5:20 PM CDT	Mesoscale Discussion	SPC	85 min
Aug 20, 5:30 PM CDT	Severe Thunderstorm Warning	DVN	42 min
Aug 21, 9:53 PM CDT	Dense Fog Advisory	DVN	12 hr
Sep 2, 5:38 PM CDT	Severe Thunderstorm Warning	DVN	40 min
Sep 6, 12:20 AM CDT	Special Weather Statement	DVN	55 min
Sep 6, 9:45 PM CDT	Special Weather Statement	DVN	60 min
Sep 10, 3:38 PM CDT	Special Weather Statement	DVN	2 hr
Sep 18, 7:49 AM CDT	Special Weather Statement	DVN	56 min
Sep 18, 8:26 PM CDT	Mesoscale Discussion	SPC	94 min
Sep 19, 12:10 AM CDT	Severe Thunderstorm Warning	DVN	65 min
Sep 21, 1:02 PM CDT	Mesoscale Discussion	SPC	88 min
Sep 21, 1:31 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 21, 2:59 PM CDT	Special Weather Statement	DVN	61 min
Sep 21, 3:25 PM CDT	Flash Flood Watch	DVN	13 hr
Sep 21, 3:40 PM CDT	Mesoscale Discussion	SPC	95 min
Oct 2, 3:35 AM CDT	Frost Advisory	DVN	29 hr
Oct 3, 3:10 PM CDT	Frost Advisory	DVN	18 hr
Oct 21, 9:06 PM CDT	Frost Advisory	DVN	11 hr
Oct 23, 3:22 PM CDT	Tornado Watch	SPC	3 hr
Oct 24, 3:33 PM CDT	High Wind Watch	DVN	61 hr
Oct 25, 3:32 PM CDT	High Wind Warning	DVN	27 hr
Oct 25, 3:32 PM CDT	Wind Advisory	DVN	27 hr
Oct 25, 9:36 PM CDT	Mesoscale Discussion	SPC	24 min
Oct 25, 10:03 PM CDT	Tornado Watch	SPC	9 hr
Oct 26, 2:21 AM CDT	Mesoscale Discussion	SPC	114 min
Oct 27, 4:01 AM CDT	Wind Advisory	DVN	15 hr
Oct 28, 3:21 AM CDT	Freeze Warning	DVN	30 hr
Nov 22, 3:41 AM CST	Special Weather Statement	DVN	64 min
Nov 22, 10:50 AM CST	Mesoscale Discussion	SPC	85 min
Nov 22, 11:23 AM CST	Tornado Watch	SPC	7 hr
Nov 22, 2:10 PM CST	Mesoscale Discussion	SPC	95 min
Dec 3, 3:36 AM CST	Winter Weather Advisory	DVN	38 hr
Dec 10, 3:07 PM CST	Blizzard Watch	DVN	21 hr
Dec 11, 3:46 AM CST	Blizzard Warning	DVN	32 hr
Dec 12, 2:45 PM CST	Wind Chill Advisory	DVN	19 hr
Dec 19, 3:22 PM CST	Winter Weather Advisory	DVN	43 hr
Dec 23, 4:38 AM CST	Winter Weather Advisory	DVN	43 hr
Dec 26, 10:33 PM CST	Dense Fog Advisory	DVN	12 hr
Dec 29, 11:28 AM CST	Dense Fog Advisory	DVN	51 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	21
Tornado Warning	1
Severe Thunderstorm Watch	20
Tornado Watch	8
Mesoscale Discussion	48
Special Weather Statement	28
Flooding
Areal Flood Warning	2
Flash Flood Warning	9
River Flood Warning	12
Flash Flood Watch	21
Winter
Blizzard Warning	1
Ice Storm Warning	1
Winter Storm Warning	3
Blizzard Watch	1
Winter Storm Watch	3
Freezing Rain Advisory	1
Winter Weather Advisory	7
Heat
Excessive Heat Warning	1
Heat Advisory	10
Cold
Freeze Warning	1
Frost Advisory	4
Wind Chill Advisory	7
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	3
Fog and smoke
Dense Fog Advisory	14

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2009 2011

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.