Weather alerts in Linn County, Iowa, 2019

184 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Linn County and its neighbors

Each county as a circle sized by its count in 2019. Tap one for its archive.

Alerts: 184
Warnings: 49
Watches: 28
Advisories: 44
Busiest month: May33 alerts
Busiest day: May 24, 201912 alerts

Over time

By month

Warning verification

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

1 of 6 tornado warnings covering Linn County in 2019 had a tornado report inside them; 0 of 2 tornado reports fell inside a warning.

Linn County, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	6	1	83%	2	0%
Severe thunderstorm warnings	15	8	47%	14	43%	28 min
Flash flood warnings	3	2	33%	2	100%	37 min

Each office's whole area, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Quad Cities, IA: tornado warnings	33	14	58%	27	67%	18 min
NWS Quad Cities, IA: severe thunderstorm warnings	167	103	38%	314	83%	25 min
NWS Quad Cities, IA: flash flood warnings	67	37	45%	68	84%	95 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 7, 2:50 PM CST	Wind Advisory	DVN	30 hr
Jan 10, 2:21 PM CST	Winter Weather Advisory	DVN	55 hr
Jan 14, 2:30 AM CST	Dense Fog Advisory	DVN	6 hr
Jan 14, 1:06 PM CST	Winter Weather Advisory	DVN	41 hr
Jan 17, 10:05 AM CST	Winter Storm Watch	DVN	17 hr
Jan 17, 1:56 PM CST	Winter Storm Warning	DVN	44 hr
Jan 18, 5:54 PM CST	Mesoscale Discussion	SPC	6 hr
Jan 21, 11:55 AM CST	Winter Weather Advisory	DVN	48 hr
Jan 22, 3:32 AM CST	Winter Storm Warning	DVN	32 hr
Jan 23, 2:40 PM CST	Wind Chill Watch	DVN	12 hr
Jan 23, 2:40 PM CST	Winter Weather Advisory	DVN	30 hr
Jan 24, 2:52 AM CST	Wind Chill Advisory	DVN	32 hr
Jan 24, 2:41 PM CST	Wind Chill Warning	DVN	21 hr
Jan 26, 3:26 PM CST	Winter Weather Advisory	DVN	51 hr
Jan 27, 2:27 PM CST	Wind Chill Watch	DVN	24 hr
Jan 28, 3:01 AM CST	Wind Chill Advisory	DVN	39 hr
Jan 28, 2:19 PM CST	Wind Chill Warning	DVN	70 hr
Jan 31, 3:03 AM CST	Winter Weather Advisory	DVN	21 hr
Jan 31, 10:04 AM CST	Wind Chill Warning	DVN	3 hr
Feb 2, 2:49 PM CST	Dense Fog Advisory	DVN	33 hr
Feb 4, 2:15 PM CST	Winter Weather Advisory	DVN	37 hr
Feb 5, 1:37 PM CST	Mesoscale Discussion	SPC	5 hr
Feb 6, 3:08 AM CST	Winter Weather Advisory	DVN	48 hr
Feb 6, 2:16 PM CST	Special Weather Statement	DVN	29 min
Feb 6, 9:33 PM CST	Mesoscale Discussion	SPC	6 hr
Feb 7, 6:26 AM CST	Mesoscale Discussion	SPC	4 hr
Feb 8, 3:13 AM CST	Wind Chill Advisory	DVN	9 hr
Feb 10, 3:09 PM CST	Winter Storm Watch	DVN	12 hr
Feb 11, 3:08 AM CST	Winter Storm Warning	DVN	45 hr
Feb 15, 2:18 AM CST	Wind Chill Advisory	DVN	7 hr
Feb 15, 3:08 PM CST	Winter Weather Advisory	DVN	57 hr
Feb 17, 12:46 AM CST	Mesoscale Discussion	SPC	4 hr
Feb 19, 3:46 AM CST	Winter Storm Warning	DVN	36 hr
Feb 22, 4:16 AM CST	Winter Weather Advisory	DVN	30 hr
Feb 22, 2:53 PM CST	High Wind Watch	DVN	13 hr
Feb 23, 3:30 AM CST	Wind Advisory	DVN	39 hr
Feb 23, 6:23 AM CST	Flash Flood Watch	DVN	15 hr
Feb 23, 1:31 PM CST	Winter Weather Advisory	DVN	31 hr
Feb 23, 6:21 PM CST	Dense Fog Advisory	DVN	5 hr
Feb 26, 8:23 PM CST	Winter Weather Advisory	DVN	13 hr
Mar 3, 3:42 AM CST	Wind Chill Advisory	DVN	31 hr
Mar 9, 3:06 PM CST	Wind Advisory	DVN	17 hr
Mar 11, 3:16 PM CDT	Flood Watch	DVN	56 hr
Mar 12, 9:43 AM CDT	River Flood Warning	DVN	21 days
Mar 12, 10:45 AM CDT	River Flood Warning	DVN	21 days
Mar 12, 10:45 AM CDT	River Flood Warning	DVN	9 days
Mar 12, 10:45 AM CDT	River Flood Warning	DVN	21 days
Mar 13, 5:10 AM CDT	Dense Fog Advisory	DVN	7 hr
Mar 14, 9:57 AM CDT	River Flood Warning	DVN	69 hr
Mar 17, 2:25 PM CDT	River Flood Warning	DVN	51 hr
Apr 5, 3:54 AM CDT	Dense Fog Advisory	DVN	6 hr
Apr 10, 3:13 AM CDT	Wind Advisory	DVN	40 hr
Apr 11, 3:56 AM CDT	Special Weather Statement	DVN	34 min
Apr 12, 3:52 AM CDT	Wind Advisory	DVN	16 hr
Apr 17, 5:16 PM CDT	Mesoscale Discussion	SPC	89 min
Apr 17, 6:26 PM CDT	Special Weather Statement	DVN	64 min
Apr 22, 2:42 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 22, 3:26 PM CDT	Severe Thunderstorm Warning	DVN	64 min
Apr 22, 3:30 PM CDT	Severe Thunderstorm Warning	DVN	60 min
Apr 22, 4:19 PM CDT	Severe Thunderstorm Warning	DVN	56 min
Apr 25, 4:06 AM CDT	Dense Fog Advisory	DVN	6 hr
Apr 27, 3:30 AM CDT	Winter Weather Advisory	DVN	17 hr
Apr 27, 3:39 PM CDT	Freeze Warning	DVN	17 hr
May 5, 5:27 PM CDT	Special Weather Statement	DVN	63 min
May 8, 4:00 PM CDT	Special Weather Statement	DVN	60 min
May 16, 7:14 PM CDT	Mesoscale Discussion	SPC	2 hr
May 16, 7:57 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 16, 8:57 PM CDT	Severe Thunderstorm Warning	DVN	48 min
May 16, 11:12 PM CDT	Mesoscale Discussion	SPC	2 hr
May 18, 2:40 AM CDT	Flash Flood Watch	DVN	24 hr
May 18, 8:07 PM CDT	Special Weather Statement	DVN	83 min
May 18, 8:27 PM CDT	Flash Flood Warning	DVN	6 hr
May 24, 12:58 AM CDT	Special Weather Statement	DVN	32 min
May 24, 3:46 AM CDT	Flash Flood Watch	DVN	23 hr
May 24, 7:41 AM CDT	Special Weather Statement	DVN	64 min
May 24, 7:46 AM CDT	Special Weather Statement	DVN	29 min
May 24, 8:07 AM CDT	Severe Thunderstorm Warning	DVN	38 min
May 24, 8:41 AM CDT	Special Weather Statement	DVN	49 min
May 24, 8:57 AM CDT	Special Weather Statement	DVN	33 min
May 24, 10:05 AM CDT	River Flood Warning	DVN	5 days
May 24, 10:05 AM CDT	River Flood Warning	DVN	6 days
May 24, 2:42 PM CDT	River Flood Warning	DVN	5 days
May 24, 3:25 PM CDT	Mesoscale Discussion	SPC	65 min
May 24, 6:23 PM CDT	Tornado Watch	SPC	4 hr
May 26, 7:06 PM CDT	River Flood Watch	DVN	7 days
May 27, 8:22 AM CDT	Special Weather Statement	DVN	23 min
May 27, 10:17 AM CDT	River Flood Warning	DVN	21 days
May 27, 10:17 AM CDT	River Flood Warning	DVN	7 days
May 28, 3:45 AM CDT	Flash Flood Watch	DVN	25 hr
May 28, 5:05 PM CDT	Special Weather Statement	DVN	55 min
May 29, 6:17 PM CDT	Mesoscale Discussion	SPC	118 min
May 29, 7:11 PM CDT	Tornado Warning	DVN	49 min
May 29, 7:53 PM CDT	Tornado Warning	DVN	52 min
May 29, 8:18 PM CDT	Flash Flood Warning	DVN	6 hr
May 29, 8:31 PM CDT	Tornado Warning	DVN	32 min
May 29, 9:00 PM CDT	Severe Thunderstorm Warning	DVN	75 min
Jun 9, 4:34 PM CDT	Tornado Warning Tornado observed	DVN	41 min
Jun 12, 6:07 PM CDT	Special Weather Statement	DVN	53 min
Jun 15, 1:20 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 15, 3:50 PM CDT	Mesoscale Discussion	SPC	115 min
Jun 15, 5:47 PM CDT	Mesoscale Discussion	SPC	88 min
Jun 15, 6:46 PM CDT	Severe Thunderstorm Warning	DVN	59 min
Jun 24, 2:00 PM CDT	Special Weather Statement	DVN	30 min
Jun 24, 2:33 PM CDT	Special Weather Statement	DVN	27 min
Jun 24, 2:39 PM CDT	Severe Thunderstorm Warning	DVN	19 min
Jun 26, 5:08 AM CDT	Special Weather Statement	DVN	67 min
Jun 27, 12:23 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 27, 1:55 PM CDT	Mesoscale Discussion	SPC	95 min
Jun 27, 3:27 PM CDT	Mesoscale Discussion	SPC	93 min
Jun 27, 3:29 PM CDT	Special Weather Statement	DVN	31 min
Jun 27, 5:51 PM CDT	Mesoscale Discussion	SPC	84 min
Jun 28, 7:17 AM CDT	Special Weather Statement	DVN	28 min
Jun 28, 7:39 AM CDT	Special Weather Statement	DVN	66 min
Jun 29, 1:18 PM CDT	Heat Advisory	DVN	8 hr
Jun 30, 3:18 AM CDT	Heat Advisory	DVN	18 hr
Jun 30, 3:20 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 30, 5:20 PM CDT	Mesoscale Discussion	SPC	115 min
Jun 30, 5:31 PM CDT	Severe Thunderstorm Warning	DVN	44 min
Jun 30, 6:00 PM CDT	Severe Thunderstorm Warning	DVN	45 min
Jul 2, 6:07 PM CDT	Special Weather Statement	DVN	38 min
Jul 3, 3:17 PM CDT	Special Weather Statement	DVN	43 min
Jul 3, 4:47 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 9, 5:30 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 15, 3:13 PM CDT	Excessive Heat Watch	DVN	37 hr
Jul 16, 3:29 PM CDT	Excessive Heat Warning	DVN	4 days
Jul 16, 6:52 PM CDT	Special Weather Statement	DVN	83 min
Jul 17, 4:00 AM CDT	Flash Flood Watch	DVN	30 hr
Jul 17, 9:09 AM CDT	Mesoscale Discussion	SPC	96 min
Jul 17, 10:38 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 17, 11:34 AM CDT	Special Weather Statement	DVN	86 min
Jul 17, 12:59 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 5, 10:37 PM CDT	Special Weather Statement	DVN	53 min
Aug 11, 7:15 PM CDT	Special Weather Statement	DVN	30 min
Aug 11, 7:27 PM CDT	Tornado Warning	DVN	18 min
Aug 12, 4:29 AM CDT	Dense Fog Advisory	DVN	5 hr
Aug 12, 3:46 PM CDT	Mesoscale Discussion	SPC	89 min
Aug 18, 4:14 AM CDT	Special Weather Statement	DVN	46 min
Aug 18, 4:44 AM CDT	Special Weather Statement	DVN	46 min
Aug 20, 5:43 AM CDT	Mesoscale Discussion	SPC	92 min
Aug 20, 6:18 AM CDT	Severe Thunderstorm Watch	SPC	11 hr
Aug 20, 6:26 AM CDT	Flash Flood Warning	DVN	5 hr
Aug 20, 6:37 AM CDT	Severe Thunderstorm Warning	DVN	31 min
Sep 2, 6:37 PM CDT	Mesoscale Discussion	SPC	83 min
Sep 9, 2:49 PM CDT	Mesoscale Discussion	SPC	116 min
Sep 9, 3:32 PM CDT	Tornado Watch	SPC	6 hr
Sep 9, 7:49 PM CDT	Mesoscale Discussion	SPC	86 min
Sep 12, 1:12 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 12, 3:40 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Sep 12, 4:35 PM CDT	Special Weather Statement	DVN	25 min
Sep 12, 4:50 PM CDT	Severe Thunderstorm Warning	DVN	40 min
Sep 12, 6:19 PM CDT	Severe Thunderstorm Warning	DVN	41 min
Sep 15, 9:07 PM CDT	Dense Fog Advisory	DVN	13 hr
Sep 18, 2:40 PM CDT	Severe Thunderstorm Warning	DVN	50 min
Sep 18, 3:27 PM CDT	Special Weather Statement	DVN	48 min
Sep 20, 4:07 AM CDT	Flash Flood Watch	DVN	63 hr
Sep 23, 5:17 AM CDT	Dense Fog Advisory	DVN	3 hr
Sep 27, 3:49 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 28, 8:52 PM CDT	Special Weather Statement	DVN	38 min
Sep 30, 2:39 PM CDT	Flash Flood Watch	DVN	39 hr
Oct 1, 5:03 PM CDT	Mesoscale Discussion	SPC	117 min
Oct 1, 5:55 PM CDT	Severe Thunderstorm Warning	DVN	50 min
Oct 1, 6:05 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Oct 1, 6:46 PM CDT	Tornado Warning	DVN	29 min
Oct 1, 8:54 PM CDT	Mesoscale Discussion	SPC	96 min
Oct 1, 8:57 PM CDT	Special Weather Statement	DVN	48 min
Oct 5, 11:57 AM CDT	Special Weather Statement	DVN	48 min
Oct 5, 8:47 PM CDT	River Flood Warning	DVN	5 days
Oct 10, 4:08 AM CDT	Freeze Watch	DVN	23 hr
Oct 11, 3:36 AM CDT	Freeze Warning	DVN	29 hr
Oct 12, 9:16 AM CDT	Wind Advisory	DVN	9 hr
Oct 13, 1:52 PM CDT	Frost Advisory	DVN	19 hr
Oct 19, 8:19 PM CDT	Dense Fog Advisory	DVN	15 hr
Oct 21, 4:36 AM CDT	Special Weather Statement	DVN	24 min
Oct 21, 10:48 AM CDT	Wind Advisory	DVN	28 hr
Oct 30, 12:30 PM CDT	Winter Weather Advisory	DVN	28 hr
Nov 10, 12:49 PM CST	Winter Weather Advisory	DVN	24 hr
Nov 20, 12:18 AM CST	Dense Fog Advisory	DVN	10 hr
Nov 25, 2:47 PM CST	High Wind Watch	DVN	21 hr
Nov 26, 11:21 AM CST	High Wind Warning	DVN	31 hr
Dec 9, 2:02 AM CST	Dense Fog Advisory	DVN	7 hr
Dec 9, 11:31 AM CST	Winter Weather Advisory	DVN	4 hr
Dec 9, 12:07 PM CST	Snow Squall Warning	DVN	53 min
Dec 9, 12:57 PM CST	Snow Squall Warning	DVN	48 min
Dec 28, 9:46 AM CST	Dense Fog Advisory	DVN	10 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	15
Tornado Warning	6
Severe Thunderstorm Watch	9
Tornado Watch	2
Mesoscale Discussion	29
Special Weather Statement	34
Flooding
Flash Flood Warning	3
River Flood Warning	12
Flash Flood Watch	7
Flood Watch	1
River Flood Watch	1
Winter
Snow Squall Warning	2
Winter Storm Warning	4
Winter Storm Watch	2
Winter Weather Advisory	16
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Heat Advisory	2
Cold
Freeze Warning	2
Wind Chill Warning	3
Freeze Watch	1
Wind Chill Watch	2
Frost Advisory	1
Wind Chill Advisory	5
Wind and dust
High Wind Warning	1
High Wind Watch	2
Wind Advisory	7
Fog and smoke
Dense Fog Advisory	13

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2018 2020

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.