Weather alerts in Calhoun County, Iowa, 2010

190 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Calhoun County and its neighbors

Each county as a circle sized by its count in 2010. Tap one for its archive.

Alerts: 190
Warnings: 51
Watches: 37
Advisories: 49
Busiest month: June52 alerts
Busiest day: August 10, 201011 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 7 tornado warnings covering Calhoun County in 2010 had a tornado report inside them.

Calhoun County, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	7	1	86%	0
Severe thunderstorm warnings	24	5	79%	8	50%	33 min
Flash flood warnings	8	5	38%	6	83%	166 min

Each office's whole area, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Des Moines, IA: tornado warnings	56	12	79%	33	76%	14 min
NWS Des Moines, IA: severe thunderstorm warnings	361	187	48%	501	81%	24 min
NWS Des Moines, IA: flash flood warnings	100	64	36%	180	87%	120 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, 2:24 PM CST	Wind Chill Warning	DMX	19 hr
Jan 3, 2:55 PM CST	Wind Chill Advisory	DMX	20 hr
Jan 4, 3:41 PM CST	Wind Chill Advisory	DMX	19 hr
Jan 4, 6:52 PM CST	Wind Chill Warning	DMX	8 hr
Jan 5, 3:59 AM CST	Winter Storm Watch	DMX	12 hr
Jan 5, 3:40 PM CST	Winter Storm Warning	DMX	53 hr
Jan 7, 3:24 PM CST	Wind Chill Warning	DMX	21 hr
Jan 7, 3:24 PM CST	Wind Chill Advisory	DMX	42 hr
Jan 16, 3:14 PM CST	Dense Fog Advisory	DMX	24 hr
Jan 17, 3:16 PM CST	Dense Fog Advisory	DMX	48 hr
Jan 19, 4:15 AM CST	Winter Storm Watch	DMX	12 hr
Jan 19, 3:58 PM CST	Ice Storm Warning	DMX	23 hr
Jan 19, 11:54 PM CST	Mesoscale Discussion	SPC	5 hr
Jan 20, 3:58 AM CST	Mesoscale Discussion	SPC	4 hr
Jan 23, 3:37 PM CST	Dense Fog Advisory	DMX	11 hr
Jan 24, 3:28 PM CST	Wind Advisory	DMX	33 hr
Jan 24, 7:02 PM CST	Winter Weather Advisory	DMX	39 hr
Jan 25, 9:55 AM CST	Blizzard Warning	DMX	18 hr
Jan 25, 5:30 PM CST	Mesoscale Discussion	SPC	3 hr
Feb 7, 3:47 PM CST	Winter Weather Advisory	DMX	48 hr
Feb 12, 8:51 PM CST	Dense Fog Advisory	DMX	14 hr
Feb 14, 4:07 AM CST	Winter Weather Advisory	DMX	32 hr
Feb 23, 9:08 PM CST	Wind Chill Advisory	DMX	14 hr
Mar 7, 8:39 AM CST	Dense Fog Advisory	DMX	7 hr
Mar 7, 4:03 PM CST	Dense Fog Advisory	DMX	17 hr
Mar 8, 6:33 PM CST	Dense Fog Advisory	DMX	17 hr
Mar 9, 1:25 PM CST	Dense Fog Advisory	DMX	39 hr
Mar 11, 9:49 AM CST	Flash Flood Watch	DMX	4 days
Mar 15, 9:20 AM CDT	Dense Fog Advisory	DMX	4 hr
Apr 5, 3:44 PM CDT	Flash Flood Watch	DMX	18 hr
Apr 6, 1:20 AM CDT	Mesoscale Discussion	SPC	85 min
Apr 24, 1:29 PM CDT	Mesoscale Discussion	SPC	91 min
Apr 29, 3:57 AM CDT	Wind Advisory	DMX	13 hr
Apr 29, 5:18 PM CDT	Mesoscale Discussion	SPC	57 min
Apr 29, 8:23 PM CDT	Mesoscale Discussion	SPC	67 min
Apr 29, 9:15 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 29, 11:21 PM CDT	Mesoscale Discussion	SPC	54 min
May 1, 3:37 AM CDT	Wind Advisory	DMX	12 hr
May 4, 11:50 AM CDT	Wind Advisory	DMX	6 hr
May 4, 2:49 PM CDT	Mesoscale Discussion	SPC	56 min
May 5, 3:21 AM CDT	Wind Advisory	DMX	14 hr
May 7, 10:48 AM CDT	Wind Advisory	DMX	17 hr
May 7, 3:48 PM CDT	Freeze Watch	DMX	12 hr
May 8, 3:54 AM CDT	Frost Advisory	DMX	29 hr
May 10, 3:00 PM CDT	Wind Advisory	DMX	5 hr
May 22, 3:38 AM CDT	Wind Advisory	DMX	15 hr
May 22, 6:28 AM CDT	Mesoscale Discussion	SPC	92 min
May 24, 11:22 AM CDT	Wind Advisory	DMX	8 hr
Jun 1, 10:21 AM CDT	Mesoscale Discussion	SPC	54 min
Jun 1, 1:36 PM CDT	Mesoscale Discussion	SPC	54 min
Jun 1, 1:53 PM CDT	Tornado Watch	SPC	9 hr
Jun 1, 5:39 PM CDT	Mesoscale Discussion	SPC	96 min
Jun 5, 2:31 PM CDT	Mesoscale Discussion	SPC	119 min
Jun 10, 6:44 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 10, 10:02 AM CDT	Mesoscale Discussion	SPC	88 min
Jun 10, 1:13 PM CDT	Wind Advisory	DMX	3 hr
Jun 11, 4:01 AM CDT	Severe Thunderstorm Warning	DMX	44 min
Jun 11, 4:11 AM CDT	Mesoscale Discussion	SPC	64 min
Jun 11, 3:50 PM CDT	Flash Flood Watch	DMX	20 hr
Jun 12, 5:46 AM CDT	Severe Thunderstorm Warning	DMX	44 min
Jun 15, 3:48 AM CDT	Dense Fog Advisory	DMX	3 hr
Jun 17, 1:54 PM CDT	Tornado Watch	SPC	8 hr
Jun 17, 3:31 PM CDT	Mesoscale Discussion	SPC	59 min
Jun 17, 7:39 PM CDT	Mesoscale Discussion	SPC	96 min
Jun 17, 7:49 PM CDT	Severe Thunderstorm Warning	DMX	41 min
Jun 17, 8:53 PM CDT	Severe Thunderstorm Warning	DMX	52 min
Jun 18, 7:47 AM CDT	Mesoscale Discussion	SPC	88 min
Jun 18, 8:01 AM CDT	Severe Thunderstorm Warning	DMX	44 min
Jun 18, 11:54 AM CDT	Severe Thunderstorm Warning	DMX	36 min
Jun 18, 1:37 PM CDT	Mesoscale Discussion	SPC	113 min
Jun 18, 2:49 PM CDT	Tornado Watch	SPC	7 hr
Jun 18, 3:22 PM CDT	Flash Flood Watch	DMX	9 hr
Jun 19, 4:01 AM CDT	Flash Flood Watch	DMX	54 hr
Jun 19, 10:38 PM CDT	Severe Thunderstorm Warning	DMX	37 min
Jun 22, 3:40 PM CDT	Flash Flood Watch	DMX	20 hr
Jun 22, 7:08 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 22, 8:53 PM CDT	Tornado Warning	DMX	37 min
Jun 22, 9:00 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 22, 9:13 PM CDT	Tornado Warning	DMX	32 min
Jun 22, 9:31 PM CDT	Tornado Warning	DMX	29 min
Jun 22, 9:55 PM CDT	Tornado Warning	DMX	35 min
Jun 22, 9:59 PM CDT	Mesoscale Discussion	SPC	91 min
Jun 22, 10:25 PM CDT	Tornado Warning	DMX	50 min
Jun 22, 10:49 PM CDT	Tornado Watch	SPC	7 hr
Jun 22, 11:47 PM CDT	Mesoscale Discussion	SPC	88 min
Jun 25, 5:32 PM CDT	Mesoscale Discussion	SPC	118 min
Jun 25, 9:06 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 25, 10:37 PM CDT	Severe Thunderstorm Warning	DMX	53 min
Jun 25, 11:37 PM CDT	Mesoscale Discussion	SPC	83 min
Jun 26, 12:45 AM CDT	Severe Thunderstorm Warning	DMX	60 min
Jun 26, 1:52 AM CDT	Mesoscale Discussion	SPC	83 min
Jun 26, 3:55 AM CDT	Flash Flood Watch	DMX	28 hr
Jun 26, 7:56 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 26, 10:58 PM CDT	Mesoscale Discussion	SPC	92 min
Jun 26, 11:18 PM CDT	Severe Thunderstorm Warning	DMX	39 min
Jun 27, 12:32 AM CDT	Areal Flood Advisory	DMX	4 hr
Jun 27, 12:52 AM CDT	Flash Flood Warning	DMX	6 hr
Jun 27, 1:27 AM CDT	Severe Thunderstorm Warning	DMX	37 min
Jun 27, 1:49 AM CDT	Severe Thunderstorm Warning	DMX	41 min
Jun 27, 2:56 AM CDT	Flash Flood Warning	DMX	6 hr
Jul 7, 11:11 AM CDT	Flash Flood Watch	DMX	15 hr
Jul 7, 2:54 PM CDT	Mesoscale Discussion	SPC	96 min
Jul 13, 3:33 AM CDT	Dense Fog Advisory	DMX	4 hr
Jul 13, 3:21 PM CDT	Heat Advisory	DMX	29 hr
Jul 14, 2:26 PM CDT	Mesoscale Discussion	SPC	94 min
Jul 14, 4:38 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 14, 7:39 PM CDT	Severe Thunderstorm Warning	DMX	51 min
Jul 16, 3:15 PM CDT	Heat Advisory	DMX	28 hr
Jul 16, 3:41 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 16, 4:41 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 16, 7:28 PM CDT	Mesoscale Discussion	SPC	92 min
Jul 17, 8:55 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 17, 11:59 PM CDT	Mesoscale Discussion	SPC	91 min
Jul 18, 12:23 AM CDT	Tornado Warning	DMX	37 min
Jul 18, 12:58 AM CDT	Severe Thunderstorm Warning	DMX	62 min
Jul 18, 1:39 AM CDT	Severe Thunderstorm Warning	DMX	51 min
Jul 18, 2:20 AM CDT	Severe Thunderstorm Warning	DMX	43 min
Jul 18, 2:31 AM CDT	Mesoscale Discussion	SPC	59 min
Jul 19, 3:00 AM CDT	Mesoscale Discussion	SPC	60 min
Jul 21, 3:51 PM CDT	Flash Flood Watch	DMX	47 hr
Jul 22, 2:48 AM CDT	Mesoscale Discussion	SPC	57 min
Jul 22, 3:44 AM CDT	Flash Flood Warning	DMX	6 hr
Jul 22, 2:06 PM CDT	Mesoscale Discussion	SPC	114 min
Jul 22, 3:50 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 22, 8:25 PM CDT	Mesoscale Discussion	SPC	95 min
Jul 23, 3:26 AM CDT	Mesoscale Discussion	SPC	94 min
Jul 23, 4:06 AM CDT	Flash Flood Watch	DMX	27 hr
Jul 23, 4:09 AM CDT	Flash Flood Warning	DMX	6 hr
Jul 23, 10:49 PM CDT	Mesoscale Discussion	SPC	86 min
Jul 30, 11:52 PM CDT	Dense Fog Advisory	DMX	9 hr
Aug 2, 3:52 AM CDT	Flash Flood Watch	DMX	24 hr
Aug 7, 3:40 PM CDT	Excessive Heat Watch	DMX	12 hr
Aug 8, 3:29 AM CDT	Heat Advisory	DMX	15 hr
Aug 8, 2:19 PM CDT	Mesoscale Discussion	SPC	86 min
Aug 8, 2:43 PM CDT	Flash Flood Watch	DMX	17 hr
Aug 8, 5:47 PM CDT	Mesoscale Discussion	SPC	58 min
Aug 8, 7:05 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 8, 8:13 PM CDT	Severe Thunderstorm Warning	DMX	62 min
Aug 8, 8:57 PM CDT	Mesoscale Discussion	SPC	63 min
Aug 8, 11:19 PM CDT	Mesoscale Discussion	SPC	86 min
Aug 9, 1:42 AM CDT	Flash Flood Warning	DMX	4 hr
Aug 9, 2:20 AM CDT	Mesoscale Discussion	SPC	100 min
Aug 10, 3:55 AM CDT	Flash Flood Warning	DMX	6 hr
Aug 10, 4:09 AM CDT	Heat Advisory	DMX	63 hr
Aug 10, 10:00 AM CDT	Areal Flood Warning	DMX	12 hr
Aug 10, 1:32 PM CDT	Mesoscale Discussion	SPC	58 min
Aug 10, 1:46 PM CDT	Tornado Watch	SPC	6 hr
Aug 10, 3:49 PM CDT	Severe Thunderstorm Warning	DMX	41 min
Aug 10, 4:30 PM CDT	Severe Thunderstorm Warning	DMX	45 min
Aug 10, 5:48 PM CDT	Tornado Warning	DMX	42 min
Aug 10, 6:17 PM CDT	Severe Thunderstorm Warning	DMX	43 min
Aug 10, 6:25 PM CDT	Severe Thunderstorm Warning	DMX	50 min
Aug 10, 6:29 PM CDT	Flash Flood Warning	DMX	6 hr
Aug 10, 7:00 PM CDT	Flash Flood Warning	DMX	6 hr
Aug 10, 8:29 PM CDT	Severe Thunderstorm Warning	DMX	29 min
Aug 11, 12:49 AM CDT	Areal Flood Warning	DMX	13 hr
Aug 12, 3:45 PM CDT	Flash Flood Watch	DMX	33 hr
Aug 13, 9:16 AM CDT	Mesoscale Discussion	SPC	119 min
Aug 13, 10:36 AM CDT	Mesoscale Discussion	SPC	84 min
Aug 21, 9:44 PM CDT	Dense Fog Advisory	DMX	11 hr
Aug 31, 3:26 PM CDT	Mesoscale Discussion	SPC	34 min
Aug 31, 4:57 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 31, 10:30 PM CDT	Severe Thunderstorm Warning	DMX	60 min
Sep 6, 4:31 AM CDT	Wind Advisory	DMX	35 hr
Sep 15, 7:32 PM CDT	Mesoscale Discussion	SPC	28 min
Sep 15, 8:19 PM CDT	Severe Thunderstorm Warning	DMX	26 min
Sep 18, 2:16 AM CDT	Mesoscale Discussion	SPC	59 min
Sep 18, 8:26 PM CDT	Mesoscale Discussion	SPC	94 min
Sep 20, 1:44 AM CDT	Dense Fog Advisory	DMX	7 hr
Oct 2, 3:56 AM CDT	Frost Advisory	DMX	29 hr
Oct 23, 5:13 PM CDT	Mesoscale Discussion	SPC	62 min
Oct 24, 3:35 PM CDT	High Wind Watch	DMX	24 hr
Oct 25, 3:49 PM CDT	High Wind Watch	DMX	36 hr
Oct 25, 3:49 PM CDT	High Wind Warning	DMX	29 hr
Oct 25, 3:49 PM CDT	Wind Advisory	DMX	51 hr
Oct 27, 3:40 AM CDT	High Wind Warning	DMX	15 hr
Nov 12, 11:15 AM CST	Winter Storm Watch	DMX	4 hr
Nov 12, 3:34 PM CST	Winter Storm Warning	DMX	20 hr
Nov 21, 3:22 PM CST	Freezing Rain Advisory	DMX	23 hr
Nov 23, 4:02 PM CST	Winter Weather Advisory	DMX	30 hr
Nov 30, 3:49 AM CST	Wind Advisory	DMX	11 hr
Dec 10, 3:45 PM CST	Blizzard Warning	DMX	41 hr
Dec 10, 3:45 PM CST	Winter Weather Advisory	DMX	24 hr
Dec 12, 9:12 AM CST	Wind Chill Advisory	DMX	27 hr
Dec 23, 3:32 AM CST	Winter Weather Advisory	DMX	38 hr
Dec 29, 11:12 AM CST	Dense Fog Advisory	DMX	32 hr
Dec 29, 3:49 PM CST	Winter Storm Watch	DMX	23 hr
Dec 30, 3:07 PM CST	Winter Weather Advisory	DMX	22 hr
Dec 31, 9:29 AM CST	Mesoscale Discussion	SPC	5 hr
Dec 31, 12:50 PM CST	Winter Weather Advisory	DMX	3 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	24
Tornado Warning	7
Severe Thunderstorm Watch	11
Tornado Watch	5
Mesoscale Discussion	53
Flooding
Areal Flood Warning	2
Flash Flood Warning	8
Flash Flood Watch	13
Areal Flood Advisory	1
Winter
Blizzard Warning	2
Ice Storm Warning	1
Winter Storm Warning	2
Winter Storm Watch	4
Freezing Rain Advisory	1
Winter Weather Advisory	8
Heat
Excessive Heat Watch	1
Heat Advisory	4
Cold
Wind Chill Warning	3
Freeze Watch	1
Frost Advisory	2
Wind Chill Advisory	5
Wind and dust
High Wind Warning	2
High Wind Watch	2
Wind Advisory	13
Fog and smoke
Dense Fog Advisory	15

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.