Weather alerts in Shelby County, Iowa, 2024

190 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Shelby County and its neighbors

Each county as a circle sized by its count in 2024. Tap one for its archive.

Alerts: 190
Warnings: 69
Watches: 32
Advisories: 49
Busiest month: May42 alerts
Busiest day: May 21, 202424 alerts

Over time

By month

Warning verification

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

4 of 10 tornado warnings covering Shelby County in 2024 had a tornado report inside them; 9 of 13 tornado reports fell inside a warning, on average 30 minutes after it went out.

Shelby County, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	10	4	60%	13	69%	30 min
Severe thunderstorm warnings	33	16	52%	15	100%	32 min
Flash flood warnings	2	1	50%	0

Each office's whole area, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Omaha, NE: tornado warnings	130	58	55%	152	84%	23 min
NWS Omaha, NE: severe thunderstorm warnings	415	171	59%	586	84%	25 min
NWS Omaha, NE: flash flood warnings	39	18	54%	46	78%	61 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 3, 3:17 AM CST	Dense Fog Advisory	OAX	9 hr
Jan 5, 3:01 PM CST	Winter Storm Watch	OAX	35 hr
Jan 7, 2:28 AM CST	Winter Storm Warning	OAX	58 hr
Jan 10, 2:10 AM CST	Winter Storm Watch	OAX	13 hr
Jan 10, 2:43 AM CST	Wind Chill Watch	OAX	25 hr
Jan 10, 2:40 PM CST	Winter Storm Warning	OAX	3 days
Jan 11, 3:22 AM CST	Wind Chill Warning	OAX	5 days
Jan 11, 3:22 AM CST	Wind Chill Advisory	OAX	23 hr
Jan 12, 2:29 PM CST	Mesoscale Discussion	SPC	4 hr
Jan 13, 3:16 PM CST	Winter Weather Advisory	OAX	9 hr
Jan 17, 3:22 AM CST	Wind Chill Watch	OAX	35 hr
Jan 17, 3:22 AM CST	Wind Chill Advisory	OAX	57 hr
Jan 17, 2:26 PM CST	Winter Weather Advisory	OAX	37 hr
Jan 18, 2:10 PM CST	Wind Chill Advisory	OAX	46 hr
Jan 18, 4:54 PM CST	Snow Squall Warning Significant damage threat	OAX	66 min
Jan 18, 5:56 PM CST	Special Weather Statement	OAX	64 min
Jan 20, 2:25 AM CST	Wind Chill Advisory	OAX	31 hr
Jan 22, 3:02 PM CST	Dense Fog Advisory	OAX	21 hr
Jan 23, 2:55 PM CST	Dense Fog Advisory	OAX	21 hr
Jan 24, 1:46 PM CST	Dense Fog Advisory	OAX	22 hr
Jan 25, 2:18 PM CST	Dense Fog Advisory	OAX	22 hr
Jan 26, 6:39 PM CST	Dense Fog Advisory	OAX	17 hr
Jan 27, 1:36 PM CST	Dense Fog Advisory	OAX	20 hr
Jan 28, 2:18 PM CST	Dense Fog Advisory	OAX	18 hr
Jan 30, 11:36 PM CST	Dense Fog Advisory	OAX	8 hr
Feb 1, 2:47 AM CST	Dense Fog Advisory	OAX	33 hr
Feb 2, 12:04 PM CST	Dense Fog Advisory	OAX	3 days
Feb 25, 1:47 PM CST	Red Flag Warning	OAX	28 hr
Feb 26, 1:20 PM CST	Wind Advisory	OAX	35 hr
Feb 28, 1:54 PM CST	Red Flag Warning	OAX	30 hr
Mar 3, 1:59 AM CST	Red Flag Warning	OAX	16 hr
Mar 24, 2:57 PM CDT	Winter Weather Advisory	OAX	43 hr
Mar 25, 2:44 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 2, 2:17 PM CDT	Wind Advisory	OAX	29 hr
Apr 5, 3:52 AM CDT	Fire Weather Watch	OAX	11 hr
Apr 5, 2:27 PM CDT	Red Flag Warning	OAX	31 hr
Apr 5, 2:34 PM CDT	High Wind Warning	OAX	31 hr
Apr 5, 2:34 PM CDT	Wind Advisory	OAX	26 hr
Apr 9, 3:08 PM CDT	Fire Weather Watch	OAX	30 hr
Apr 10, 3:40 PM CDT	Red Flag Warning	OAX	28 hr
Apr 15, 2:40 AM CDT	Red Flag Warning	OAX	16 hr
Apr 16, 8:50 AM CDT	Mesoscale Discussion	SPC	55 min
Apr 16, 11:43 AM CDT	Mesoscale Discussion	SPC	92 min
Apr 16, 12:23 PM CDT	Tornado Watch	SPC	7 hr
Apr 16, 2:03 PM CDT	Mesoscale Discussion	SPC	87 min
Apr 18, 2:40 PM CDT	Freeze Warning	OAX	17 hr
Apr 19, 2:18 PM CDT	Freeze Warning	OAX	18 hr
Apr 20, 2:03 PM CDT	Freeze Warning	OAX	18 hr
Apr 22, 2:18 AM CDT	Wind Advisory	OAX	16 hr
Apr 26, 12:52 PM CDT	Tornado Watch	SPC	6 hr
Apr 26, 5:25 PM CDT	Tornado Warning Tornado observed	OAX	28 min
Apr 26, 5:36 PM CDT	Mesoscale Discussion	SPC	84 min
Apr 26, 5:38 PM CDT	Tornado Warning EmergencyTornado observed	OAX	55 min
Apr 26, 6:06 PM CDT	Severe Thunderstorm Warning	OAX	24 min
Apr 26, 6:17 PM CDT	Tornado Warning	OAX	13 min
Apr 26, 6:28 PM CDT	Severe Thunderstorm Warning	OAX	47 min
Apr 26, 7:02 PM CDT	Tornado Warning	OAX	43 min
Apr 26, 7:05 PM CDT	Severe Thunderstorm Warning	OAX	25 min
Apr 26, 7:08 PM CDT	Tornado Warning	OAX	33 min
Apr 26, 7:36 PM CDT	Areal Flood Advisory	OAX	3 hr
Apr 27, 3:29 AM CDT	Flood Watch	OAX	18 hr
Apr 30, 1:05 PM CDT	Mesoscale Discussion	SPC	85 min
Apr 30, 1:33 PM CDT	Tornado Watch	SPC	8 hr
Apr 30, 3:56 PM CDT	Severe Thunderstorm Warning	OAX	49 min
Apr 30, 3:57 PM CDT	Mesoscale Discussion	SPC	93 min
Apr 30, 4:24 PM CDT	Severe Thunderstorm Warning	OAX	21 min
Apr 30, 4:39 PM CDT	Severe Thunderstorm Warning	OAX	36 min
Apr 30, 6:54 PM CDT	Mesoscale Discussion	SPC	96 min
May 3, 3:53 AM CDT	Dense Fog Advisory	OAX	4 hr
May 3, 8:03 AM CDT	Dense Fog Advisory	OAX	57 min
May 6, 3:49 PM CDT	Tornado Watch	SPC	8 hr
May 6, 9:08 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	50 min
May 6, 9:12 PM CDT	Tornado Warning	OAX	18 min
May 6, 9:16 PM CDT	Mesoscale Discussion	SPC	119 min
May 6, 9:25 PM CDT	Tornado Warning	OAX	35 min
May 8, 2:17 PM CDT	Mesoscale Discussion	SPC	88 min
May 20, 1:45 PM CDT	Flood Watch	OAX	25 hr
May 20, 6:31 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 20, 8:37 PM CDT	Severe Thunderstorm Warning	OAX	68 min
May 20, 9:42 PM CDT	Severe Thunderstorm Warning	OAX	48 min
May 20, 9:51 PM CDT	Flash Flood Warning	OAX	5 hr
May 20, 10:01 PM CDT	Mesoscale Discussion	SPC	119 min
May 20, 11:33 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
May 20, 11:35 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	40 min
May 21, 12:14 AM CDT	Severe Thunderstorm Warning	OAX	46 min
May 21, 12:42 AM CDT	Severe Thunderstorm Warning	OAX	63 min
May 21, 12:53 AM CDT	Tornado Warning	OAX	39 min
May 21, 1:10 AM CDT	Tornado Warning	OAX	25 min
May 21, 1:44 AM CDT	Severe Thunderstorm Warning	OAX	61 min
May 21, 2:04 AM CDT	Mesoscale Discussion	SPC	116 min
May 21, 5:46 AM CDT	Areal Flood Advisory	OAX	113 min
May 21, 5:51 AM CDT	Mesoscale Discussion	SPC	114 min
May 21, 5:53 AM CDT	Severe Thunderstorm Warning	OAX	52 min
May 21, 6:11 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	49 min
May 21, 6:15 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	45 min
May 21, 7:11 AM CDT	Flash Flood Warning	OAX	4 hr
May 21, 7:33 AM CDT	Areal Flood Warning	OAX	10 hr
May 21, 10:27 AM CDT	Mesoscale Discussion	SPC	2 hr
May 21, 11:10 AM CDT	Tornado Watch	SPC	5 hr
May 21, 1:16 PM CDT	Severe Thunderstorm Warning	OAX	59 min
May 21, 2:10 PM CDT	Severe Thunderstorm Warning	OAX	50 min
May 21, 2:11 PM CDT	Severe Thunderstorm Warning	OAX	49 min
May 23, 3:30 PM CDT	Flood Watch	OAX	12 hr
May 23, 8:43 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 23, 10:38 PM CDT	Mesoscale Discussion	SPC	2 hr
May 24, 1:15 AM CDT	Mesoscale Discussion	SPC	2 hr
May 24, 2:28 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	47 min
May 24, 2:31 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	44 min
May 24, 2:39 AM CDT	Tornado Warning	OAX	31 min
May 24, 3:07 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	38 min
Jun 4, 5:26 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 12, 2:34 PM CDT	Mesoscale Discussion	SPC	116 min
Jun 12, 7:26 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 12, 8:31 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OAX	44 min
Jun 12, 9:07 PM CDT	Severe Thunderstorm Warning	OAX	10 min
Jun 15, 7:28 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 15, 7:50 PM CDT	Severe Thunderstorm Warning	OAX	55 min
Jun 15, 9:34 PM CDT	Mesoscale Discussion	SPC	86 min
Jun 18, 12:54 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 18, 1:47 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 18, 5:51 PM CDT	Mesoscale Discussion	SPC	84 min
Jun 18, 6:53 PM CDT	Special Weather Statement	OAX	52 min
Jun 21, 10:38 PM CDT	Mesoscale Discussion	SPC	67 min
Jun 23, 2:38 AM CDT	Heat Advisory	OAX	41 hr
Jun 25, 4:54 PM CDT	Mesoscale Discussion	SPC	96 min
Jun 25, 5:17 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 25, 7:07 PM CDT	Severe Thunderstorm Warning	OAX	53 min
Jun 25, 7:09 PM CDT	Mesoscale Discussion	SPC	66 min
Jun 25, 7:37 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	53 min
Jun 25, 8:11 PM CDT	Severe Thunderstorm Warning	OAX	50 min
Jun 25, 8:16 PM CDT	Severe Thunderstorm Warning	OAX	44 min
Jun 25, 9:45 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OAX	45 min
Jun 28, 3:23 PM CDT	Mesoscale Discussion	SPC	3 hr
Jul 1, 12:04 PM CDT	Flood Watch	OAX	17 hr
Jul 1, 6:43 PM CDT	Mesoscale Discussion	SPC	92 min
Jul 6, 5:44 PM CDT	Special Weather Statement	OAX	16 min
Jul 7, 7:59 PM CDT	Areal Flood Advisory	OAX	3 hr
Jul 12, 2:37 AM CDT	Excessive Heat Watch	OAX	24 hr
Jul 12, 1:57 PM CDT	Heat Advisory	OAX	30 hr
Jul 13, 2:56 AM CDT	Heat Advisory	OAX	41 hr
Jul 13, 2:56 AM CDT	Heat Advisory	OAX	65 hr
Jul 21, 3:37 AM CDT	Dense Fog Advisory	OAX	7 hr
Jul 28, 2:21 PM CDT	Excessive Heat Watch	OAX	24 hr
Jul 28, 3:49 PM CDT	Mesoscale Discussion	SPC	116 min
Jul 29, 2:35 PM CDT	Excessive Heat Warning	OAX	52 hr
Jul 29, 2:35 PM CDT	Heat Advisory	OAX	29 hr
Jul 29, 7:56 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 29, 11:41 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 30, 12:47 AM CDT	Severe Thunderstorm Warning	OAX	43 min
Jul 30, 11:17 PM CDT	Mesoscale Discussion	SPC	118 min
Jul 30, 11:54 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 31, 6:04 PM CDT	Mesoscale Discussion	SPC	56 min
Jul 31, 6:14 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OAX	61 min
Jul 31, 6:19 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 31, 6:25 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OAX	69 min
Aug 14, 5:34 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 14, 9:20 PM CDT	Mesoscale Discussion	SPC	115 min
Aug 15, 1:14 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 15, 6:14 PM CDT	Mesoscale Discussion	SPC	91 min
Aug 23, 1:46 PM CDT	Heat Advisory	OAX	54 hr
Aug 25, 2:38 AM CDT	Heat Advisory	OAX	41 hr
Aug 26, 2:55 AM CDT	Excessive Heat Warning	OAX	17 hr
Aug 29, 5:58 PM CDT	Special Weather Statement	OAX	47 min
Oct 1, 3:14 PM CDT	Fire Weather Watch	OAX	18 hr
Oct 2, 9:37 AM CDT	Red Flag Warning	OAX	9 hr
Oct 3, 2:17 PM CDT	Fire Weather Watch	OAX	36 hr
Oct 4, 2:13 PM CDT	Red Flag Warning	OAX	30 hr
Oct 13, 2:22 AM CDT	Frost Advisory	OAX	31 hr
Oct 13, 2:27 PM CDT	Freeze Warning	OAX	19 hr
Oct 14, 2:55 AM CDT	Freeze Watch	OAX	11 hr
Oct 14, 1:59 PM CDT	Freeze Warning	OAX	43 hr
Oct 15, 2:39 PM CDT	Fire Weather Watch	OAX	21 hr
Oct 16, 11:34 AM CDT	Red Flag Warning	OAX	31 hr
Oct 24, 5:22 PM CDT	Mesoscale Discussion	SPC	2 hr
Oct 28, 2:33 AM CDT	Wind Advisory	OAX	49 hr
Oct 28, 2:36 AM CDT	Fire Weather Watch	OAX	11 hr
Oct 28, 1:53 PM CDT	Red Flag Warning	OAX	30 hr
Nov 5, 11:50 PM CST	Dense Fog Advisory	OAX	10 hr
Nov 19, 1:45 AM CST	Wind Advisory	OAX	40 hr
Nov 20, 2:54 AM CST	Red Flag Warning	OAX	14 hr
Dec 3, 2:13 PM CST	Wind Advisory	OAX	31 hr
Dec 12, 2:35 PM CST	Winter Weather Advisory	OAX	48 hr
Dec 14, 7:21 PM CST	Dense Fog Advisory	OAX	16 hr
Dec 15, 9:47 PM CST	Dense Fog Advisory	OAX	8 hr
Dec 18, 2:37 PM CST	Wind Advisory	OAX	27 hr
Dec 24, 2:11 PM CST	Dense Fog Advisory	OAX	23 hr
Dec 26, 1:07 PM CST	Dense Fog Advisory	OAX	22 hr
Dec 27, 8:30 PM CST	Dense Fog Advisory	OAX	16 hr
Dec 28, 4:54 PM CST	Dense Fog Advisory	OAX	19 hr
Dec 29, 5:59 PM CST	Dense Fog Advisory	OAX	13 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	33
Tornado Warning	10
Severe Thunderstorm Watch	10
Tornado Watch	5
Mesoscale Discussion	36
Special Weather Statement	4
Flooding
Areal Flood Warning	1
Flash Flood Warning	2
Flood Watch	4
Areal Flood Advisory	3
Winter
Snow Squall Warning	1
Winter Storm Warning	2
Winter Storm Watch	2
Winter Weather Advisory	4
Heat
Excessive Heat Warning	2
Excessive Heat Watch	2
Heat Advisory	7
Cold
Freeze Warning	5
Wind Chill Warning	1
Freeze Watch	1
Wind Chill Watch	2
Frost Advisory	1
Wind Chill Advisory	4
Wind and dust
High Wind Warning	1
Wind Advisory	8
Fire
Red Flag Warning	11
Fire Weather Watch	6
Fog and smoke
Dense Fog Advisory	22

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2023 2025

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.