Weather alerts in Bremer County, Iowa, 2018

130 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Bremer County and its neighbors

Each county as a circle sized by its count in 2018. Tap one for its archive.

Alerts: 130
Warnings: 20
Watches: 26
Advisories: 42
Busiest month: June24 alerts
Busiest day: June 9, 20186 alerts

Over time

By month

Warning verification

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

Bremer County, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning
Tornado warnings	0			0
Severe thunderstorm warnings	1	0	100%	1	0%
Flash flood warnings	1	1	0%	0

Each office's whole area, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Des Moines, IA: tornado warnings	72	23	68%	69	55%	15 min
NWS Des Moines, IA: severe thunderstorm warnings	308	143	54%	427	74%	22 min
NWS Des Moines, IA: flash flood warnings	39	20	49%	70	74%	86 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, 3:46 AM CST	Wind Chill Advisory	DMX	30 hr
Jan 5, 4:04 PM CST	Wind Chill Advisory	DMX	18 hr
Jan 10, 2:08 PM CST	Winter Weather Advisory	DMX	28 hr
Jan 11, 2:24 PM CST	Wind Chill Advisory	DMX	20 hr
Jan 12, 3:46 PM CST	Wind Chill Advisory	DMX	18 hr
Jan 14, 3:47 AM CST	Wind Chill Advisory	DMX	56 hr
Feb 4, 2:32 PM CST	Winter Weather Advisory	DMX	28 hr
Feb 7, 2:23 PM CST	Winter Weather Advisory	DMX	40 hr
Feb 8, 11:05 AM CST	Winter Storm Warning	DMX	19 hr
Feb 8, 9:07 PM CST	Mesoscale Discussion	SPC	6 hr
Feb 18, 3:27 AM CST	Wind Advisory	DMX	11 hr
Feb 18, 3:45 AM CST	Winter Storm Watch	DMX	24 hr
Feb 18, 3:45 AM CST	Winter Weather Advisory	DMX	56 hr
Feb 19, 6:07 PM CST	Dense Fog Advisory	DMX	9 hr
Feb 20, 2:43 AM CST	Mesoscale Discussion	SPC	3 hr
Feb 21, 3:42 PM CST	Winter Weather Advisory	DMX	35 hr
Feb 23, 3:24 PM CST	Winter Weather Advisory	DMX	30 hr
Mar 4, 3:35 PM CST	Winter Weather Advisory	DMX	50 hr
Mar 16, 4:10 AM CDT	Winter Weather Advisory	DMX	30 hr
Mar 22, 3:48 AM CDT	Winter Storm Watch	DMX	24 hr
Mar 23, 4:00 AM CDT	Winter Storm Warning	DMX	39 hr
Mar 28, 2:51 AM CDT	Dense Fog Advisory	DMX	9 hr
Mar 30, 3:19 PM CDT	Wind Advisory	DMX	25 hr
Apr 2, 2:00 PM CDT	Winter Weather Advisory	DMX	35 hr
Apr 7, 3:05 PM CDT	Winter Weather Advisory	DMX	40 hr
Apr 13, 3:54 PM CDT	Winter Weather Advisory	DMX	48 hr
Apr 14, 1:31 AM CDT	Wind Advisory	DMX	14 hr
Apr 17, 3:54 AM CDT	Winter Storm Warning	DMX	38 hr
Apr 17, 3:54 AM CDT	Winter Weather Advisory	DMX	42 hr
Apr 27, 2:42 PM CDT	Red Flag Warning	DMX	4 hr
Apr 29, 3:26 AM CDT	Red Flag Warning	DMX	18 hr
May 1, 3:16 PM CDT	Mesoscale Discussion	SPC	89 min
May 1, 5:47 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 1, 7:55 PM CDT	Mesoscale Discussion	SPC	95 min
May 1, 9:38 PM CDT	Mesoscale Discussion	SPC	67 min
May 2, 4:31 PM CDT	Special Weather Statement	DMX	44 min
May 4, 12:33 AM CDT	Special Weather Statement	DMX	27 min
May 4, 10:29 AM CDT	River Flood Warning	DMX	70 hr
May 4, 10:29 AM CDT	River Flood Warning	DMX	66 hr
May 9, 2:21 AM CDT	Special Weather Statement	DMX	54 min
May 15, 1:52 AM CDT	Dense Fog Advisory	DMX	7 hr
May 25, 12:59 PM CDT	Mesoscale Discussion	SPC	2 hr
May 25, 5:20 PM CDT	Mesoscale Discussion	SPC	115 min
May 25, 6:29 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 2, 9:01 AM CDT	High Wind Warning	DMX	89 min
Jun 2, 5:28 PM CDT	Special Weather Statement	DMX	32 min
Jun 9, 11:25 AM CDT	Flash Flood Watch	DMX	12 hr
Jun 9, 1:46 PM CDT	Mesoscale Discussion	SPC	119 min
Jun 9, 2:26 PM CDT	Tornado Watch	SPC	5 hr
Jun 9, 3:52 PM CDT	Mesoscale Discussion	SPC	83 min
Jun 9, 6:09 PM CDT	Severe Thunderstorm Warning	DMX	51 min
Jun 9, 6:30 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 9, 7:43 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 9, 9:29 PM CDT	River Flood Warning	DMX	58 hr
Jun 9, 9:31 PM CDT	River Flood Watch	DMX	13 hr
Jun 12, 6:31 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 13, 12:11 PM CDT	Areal Flood Warning	DMX	6 hr
Jun 14, 3:00 PM CDT	Heat Advisory	DMX	4 days
Jun 18, 3:05 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 18, 3:41 PM CDT	Flash Flood Watch	DMX	16 hr
Jun 18, 5:46 PM CDT	Mesoscale Discussion	SPC	119 min
Jun 20, 3:04 PM CDT	Tornado Watch	SPC	4 hr
Jun 20, 5:13 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 26, 5:09 AM CDT	Special Weather Statement	DMX	51 min
Jun 27, 3:29 PM CDT	Heat Advisory	DMX	54 hr
Jun 28, 3:42 PM CDT	Excessive Heat Warning	DMX	29 hr
Jun 30, 3:12 AM CDT	Heat Advisory	DMX	16 hr
Jun 30, 1:39 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 1, 1:36 AM CDT	Areal Flood Warning	DMX	9 hr
Jul 3, 2:39 PM CDT	Heat Advisory	DMX	29 hr
Jul 4, 10:27 AM CDT	Mesoscale Discussion	SPC	2 hr
Jul 11, 3:44 PM CDT	Heat Advisory	DMX	28 hr
Jul 13, 3:48 AM CDT	Flash Flood Watch	DMX	18 hr
Jul 13, 12:41 PM CDT	Mesoscale Discussion	SPC	94 min
Jul 15, 6:08 AM CDT	Dense Fog Advisory	DMX	3 hr
Jul 25, 4:05 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 25, 6:29 PM CDT	Mesoscale Discussion	SPC	91 min
Aug 1, 6:52 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 5, 6:08 AM CDT	Special Weather Statement	DMX	37 min
Aug 5, 10:49 PM CDT	Special Weather Statement	DMX	56 min
Aug 5, 11:24 PM CDT	Special Weather Statement	DMX	66 min
Aug 6, 2:55 AM CDT	Special Weather Statement	DMX	50 min
Aug 8, 4:23 AM CDT	Dense Fog Advisory	DMX	5 hr
Aug 24, 7:02 PM CDT	Mesoscale Discussion	SPC	118 min
Aug 25, 3:19 AM CDT	Dense Fog Advisory	DMX	6 hr
Aug 27, 12:11 AM CDT	Special Weather Statement	DMX	79 min
Aug 27, 2:24 PM CDT	Mesoscale Discussion	SPC	96 min
Aug 28, 7:50 AM CDT	Mesoscale Discussion	SPC	115 min
Aug 28, 8:56 AM CDT	Special Weather Statement	DMX	64 min
Aug 28, 12:14 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 28, 1:14 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Sep 1, 4:38 AM CDT	Flash Flood Watch	DMX	24 hr
Sep 1, 6:34 PM CDT	Mesoscale Discussion	SPC	56 min
Sep 2, 9:45 AM CDT	Flash Flood Watch	DMX	36 hr
Sep 2, 1:34 PM CDT	Flash Flood Warning	DMX	6 hr
Sep 2, 2:24 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 2, 7:32 PM CDT	Areal Flood Warning	DMX	24 hr
Sep 3, 5:47 PM CDT	Mesoscale Discussion	SPC	58 min
Sep 3, 7:32 PM CDT	Special Weather Statement	DMX	88 min
Sep 4, 3:33 AM CDT	Flash Flood Watch	DMX	27 hr
Sep 4, 9:34 AM CDT	River Flood Watch	DMX	25 hr
Sep 4, 3:35 PM CDT	Tornado Watch	SPC	7 hr
Sep 4, 6:28 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 5, 10:15 AM CDT	River Flood Warning	DMX	4 days
Sep 19, 10:24 AM CDT	River Flood Warning	DMX	5 days
Sep 19, 10:41 AM CDT	Flash Flood Watch	DMX	25 hr
Sep 20, 5:48 PM CDT	Mesoscale Discussion	SPC	57 min
Sep 28, 3:00 AM CDT	Frost Advisory	DMX	29 hr
Oct 3, 12:07 PM CDT	Wind Advisory	DMX	13 hr
Oct 3, 5:13 PM CDT	Mesoscale Discussion	SPC	2 hr
Oct 4, 3:34 PM CDT	Flash Flood Watch	DMX	45 hr
Oct 7, 3:52 PM CDT	Flood Watch	DMX	60 hr
Oct 7, 10:05 PM CDT	River Flood Watch	DMX	36 hr
Oct 9, 10:20 AM CDT	River Flood Warning	DMX	35 hr
Oct 9, 1:46 PM CDT	Tornado Watch	SPC	7 hr
Oct 9, 6:37 PM CDT	Mesoscale Discussion	SPC	83 min
Oct 11, 3:24 AM CDT	Freeze Warning	DMX	29 hr
Oct 12, 4:05 PM CDT	Frost Advisory	DMX	11 hr
Oct 13, 3:23 PM CDT	Freeze Watch	DMX	23 hr
Oct 14, 3:45 AM CDT	Freeze Warning	DMX	30 hr
Oct 19, 7:30 PM CDT	Wind Advisory	DMX	20 hr
Oct 27, 2:24 PM CDT	Wind Advisory	DMX	23 hr
Nov 16, 3:49 AM CST	Winter Weather Advisory	DMX	28 hr
Nov 29, 3:43 AM CST	Winter Storm Watch	DMX	36 hr
Nov 30, 3:18 PM CST	Winter Weather Advisory	DMX	45 hr
Dec 11, 2:36 PM CST	Winter Weather Advisory	DMX	13 hr
Dec 13, 7:07 PM CST	Dense Fog Advisory	DMX	17 hr
Dec 28, 12:55 AM CST	Winter Weather Advisory	DMX	11 hr
Dec 31, 3:26 AM CST	Winter Weather Advisory	DMX	20 hr
Dec 31, 11:50 AM CST	Mesoscale Discussion	SPC	6 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	1
Severe Thunderstorm Watch	6
Tornado Watch	4
Mesoscale Discussion	30
Special Weather Statement	12
Flooding
Areal Flood Warning	3
Flash Flood Warning	1
River Flood Warning	6
Flash Flood Watch	8
Flood Watch	1
River Flood Watch	3
Winter
Winter Storm Warning	3
Winter Storm Watch	3
Winter Weather Advisory	17
Heat
Excessive Heat Warning	1
Heat Advisory	5
Cold
Freeze Warning	2
Freeze Watch	1
Frost Advisory	2
Wind Chill Advisory	5
Wind and dust
High Wind Warning	1
Wind Advisory	6
Fire
Red Flag Warning	2
Fog and smoke
Dense Fog Advisory	7

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2017 2019

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.