Weather alerts in Sac County, Iowa, 2008

188 weather alerts in 2008, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Sac County and its neighbors

Each county as a circle sized by its count in 2008. Tap one for its archive.

Alerts: 188
Warnings: 42
Watches: 43
Advisories: 54
Busiest month: June61 alerts
Busiest day: June 26, 200812 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 2 tornado warnings covering Sac County in 2008 had a tornado report inside them.

Sac County, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	0	100%	0
Severe thunderstorm warnings	15	8	47%	10	90%	23 min
Flash flood warnings	8	3	63%	7	43%	173 min

Each office's whole area, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Des Moines, IA: tornado warnings	130	46	65%	124	81%	18 min
NWS Des Moines, IA: severe thunderstorm warnings	509	206	60%	734	77%	24 min
NWS Des Moines, IA: flash flood warnings	140	78	44%	232	82%	134 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, 11:30 AM CST	Wind Advisory	DMX	5 hr
Jan 5, 3:35 PM CST	Dense Fog Advisory	DMX	22 hr
Jan 11, 7:35 AM CST	Dense Fog Advisory	DMX	4 hr
Jan 16, 10:50 AM CST	Snow Advisory	DMX	26 hr
Jan 18, 4:20 AM CST	Blowing Snow Advisory	DMX	9 hr
Jan 18, 4:20 AM CST	Wind Chill Advisory	DMX	26 hr
Jan 20, 3:52 PM CST	Snow Advisory	DMX	35 hr
Jan 22, 6:44 AM CST	Wind Chill Advisory	DMX	4 hr
Jan 23, 4:09 AM CST	Wind Chill Advisory	DMX	27 hr
Jan 28, 3:50 PM CST	Blowing Snow Advisory	DMX	13 hr
Jan 28, 3:58 PM CST	Wind Advisory	DMX	20 hr
Jan 29, 4:25 AM CST	Snow and Blowing Snow Advisory	DMX	14 hr
Jan 29, 4:25 AM CST	Wind Chill Advisory	DMX	28 hr
Jan 29, 7:39 AM CST	Mesoscale Discussion	SPC	5 hr
Feb 3, 3:52 AM CST	Freezing Fog Advisory	DMX	8 hr
Feb 3, 10:23 PM CST	Winter Weather Advisory	DMX	15 hr
Feb 4, 6:14 AM CST	Mesoscale Discussion	SPC	5 hr
Feb 7, 3:30 AM CST	Dense Fog Advisory	DMX	6 hr
Feb 9, 3:55 AM CST	Wind Chill Warning	DMX	32 hr
Feb 9, 3:55 AM CST	Wind Chill Advisory	DMX	38 hr
Feb 11, 3:37 AM CST	Snow Advisory	DMX	26 hr
Feb 14, 4:00 AM CST	Winter Weather Advisory	DMX	12 hr
Feb 14, 3:42 PM CST	Wind Chill Advisory	DMX	14 hr
Feb 16, 3:57 AM CST	Blizzard Watch	DMX	24 hr
Feb 17, 3:10 AM CST	Wind Advisory	DMX	17 hr
Feb 18, 3:49 PM CST	Wind Chill Advisory	DMX	14 hr
Feb 19, 3:43 PM CST	Wind Chill Warning	DMX	20 hr
Feb 24, 9:19 AM CST	Air Stagnation Advisory	DMX	14 hr
Feb 24, 11:46 PM CST	Winter Storm Warning	DMX	15 hr
Feb 25, 9:30 AM CST	Mesoscale Discussion	SPC	6 hr
Mar 17, 10:15 PM CDT	Dense Fog Advisory	DMX	13 hr
Apr 3, 11:13 PM CDT	Dense Fog Advisory	DMX	10 hr
Apr 10, 4:17 AM CDT	Wind Advisory	DMX	17 hr
Apr 15, 3:42 AM CDT	Wind Advisory	DMX	17 hr
Apr 16, 3:54 AM CDT	Wind Advisory	DMX	11 hr
Apr 24, 3:56 PM CDT	Flash Flood Watch	DMX	20 hr
Apr 26, 11:31 AM CDT	Wind Advisory	DMX	6 hr
May 1, 4:34 PM CDT	Tornado Watch	SPC	5 hr
May 1, 6:33 PM CDT	Mesoscale Discussion	SPC	57 min
May 6, 10:56 AM CDT	Mesoscale Discussion	SPC	94 min
May 6, 12:03 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 6, 5:59 PM CDT	Severe Thunderstorm Warning	DMX	46 min
May 6, 6:39 PM CDT	Severe Thunderstorm Warning	DMX	51 min
May 6, 6:56 PM CDT	Areal Flood Advisory	DMX	3 hr
May 6, 7:24 PM CDT	Flash Flood Warning	DMX	3 hr
May 6, 9:13 PM CDT	Mesoscale Discussion	SPC	62 min
May 10, 4:08 AM CDT	Flood Watch	DMX	12 hr
May 10, 4:22 AM CDT	Wind Advisory	DMX	32 hr
May 10, 3:47 PM CDT	Flash Flood Watch	DMX	12 hr
May 19, 6:21 PM CDT	Mesoscale Discussion	SPC	54 min
May 24, 9:01 PM CDT	Mesoscale Discussion	SPC	59 min
May 25, 3:30 PM CDT	Tornado Watch PDS	SPC	5 hr
May 29, 3:19 AM CDT	Flash Flood Watch	DMX	28 hr
May 29, 5:32 AM CDT	Mesoscale Discussion	SPC	118 min
May 29, 7:37 PM CDT	Mesoscale Discussion	SPC	53 min
May 29, 8:13 PM CDT	Tornado Watch	SPC	8 hr
May 29, 8:16 PM CDT	Severe Thunderstorm Warning	DMX	44 min
May 29, 11:34 PM CDT	Mesoscale Discussion	SPC	56 min
May 29, 11:48 PM CDT	Flash Flood Warning	DMX	6 hr
May 30, 2:17 AM CDT	Mesoscale Discussion	SPC	88 min
Jun 2, 3:40 PM CDT	Flash Flood Watch	DMX	19 hr
Jun 3, 1:57 AM CDT	Severe Thunderstorm Watch	SPC	3 hr
Jun 3, 4:12 AM CDT	Mesoscale Discussion	SPC	2 hr
Jun 3, 4:33 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 4, 4:16 AM CDT	Flash Flood Watch	DMX	27 hr
Jun 4, 9:12 PM CDT	Severe Thunderstorm Warning	DMX	48 min
Jun 4, 9:33 PM CDT	Mesoscale Discussion	SPC	87 min
Jun 4, 11:13 PM CDT	Severe Thunderstorm Warning	DMX	47 min
Jun 4, 11:56 PM CDT	Tornado Watch	SPC	5 hr
Jun 5, 4:17 AM CDT	Flash Flood Watch	DMX	24 hr
Jun 5, 10:55 AM CDT	Tornado Watch PDS	SPC	8 hr
Jun 5, 5:10 PM CDT	Mesoscale Discussion	SPC	95 min
Jun 5, 5:50 PM CDT	Tornado Watch PDS	SPC	7 hr
Jun 5, 9:17 PM CDT	High Wind Warning	DMX	4 hr
Jun 6, 3:50 AM CDT	Wind Advisory	DMX	12 hr
Jun 7, 4:32 AM CDT	Flash Flood Watch	DMX	46 hr
Jun 7, 12:10 PM CDT	Mesoscale Discussion	SPC	95 min
Jun 7, 12:17 PM CDT	Tornado Watch	SPC	8 hr
Jun 7, 5:52 PM CDT	Severe Thunderstorm Warning	DMX	38 min
Jun 7, 6:34 PM CDT	Mesoscale Discussion	SPC	56 min
Jun 7, 6:46 PM CDT	Flash Flood Warning	DMX	6 hr
Jun 7, 7:32 PM CDT	Severe Thunderstorm Warning	DMX	58 min
Jun 7, 7:40 PM CDT	Tornado Watch	SPC	7 hr
Jun 7, 10:15 PM CDT	Mesoscale Discussion	SPC	90 min
Jun 8, 12:48 AM CDT	Areal Flood Warning	DMX	13 hr
Jun 8, 2:29 AM CDT	Mesoscale Discussion	SPC	31 min
Jun 8, 11:22 AM CDT	Areal Flood Warning	DMX	9 hr
Jun 8, 7:53 PM CDT	Areal Flood Warning	DMX	12 hr
Jun 9, 7:39 AM CDT	Areal Flood Warning	DMX	12 hr
Jun 9, 7:21 PM CDT	Severe Thunderstorm Warning	DMX	39 min
Jun 9, 8:01 PM CDT	Areal Flood Warning	DMX	12 hr
Jun 10, 8:33 AM CDT	Areal Flood Warning	DMX	12 hr
Jun 10, 3:22 PM CDT	Flash Flood Watch	DMX	46 hr
Jun 10, 8:51 PM CDT	Areal Flood Warning	DMX	12 hr
Jun 11, 4:40 AM CDT	Mesoscale Discussion	SPC	65 min
Jun 11, 5:16 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 11, 7:05 AM CDT	Wind Advisory	DMX	6 hr
Jun 11, 8:39 AM CDT	Areal Flood Warning	DMX	24 hr
Jun 11, 2:03 PM CDT	Mesoscale Discussion	SPC	117 min
Jun 11, 2:52 PM CDT	Tornado Watch	SPC	7 hr
Jun 11, 5:59 PM CDT	Mesoscale Discussion	SPC	91 min
Jun 11, 8:02 PM CDT	Tornado Warning	DMX	28 min
Jun 11, 8:48 PM CDT	Severe Thunderstorm Warning	DMX	57 min
Jun 11, 8:52 PM CDT	Flash Flood Warning	DMX	6 hr
Jun 15, 2:01 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 19, 1:27 PM CDT	Severe Thunderstorm Watch	SPC	10 hr
Jun 21, 3:05 PM CDT	Mesoscale Discussion	SPC	85 min
Jun 25, 5:51 PM CDT	Mesoscale Discussion	SPC	84 min
Jun 26, 4:01 AM CDT	Flash Flood Watch	DMX	42 hr
Jun 26, 6:38 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 26, 6:43 AM CDT	Severe Thunderstorm Warning	DMX	62 min
Jun 26, 7:39 AM CDT	Areal Flood Advisory	DMX	3 hr
Jun 26, 7:48 AM CDT	Severe Thunderstorm Warning	DMX	57 min
Jun 26, 7:51 AM CDT	Mesoscale Discussion	SPC	84 min
Jun 26, 8:03 AM CDT	Flash Flood Warning	DMX	6 hr
Jun 26, 8:21 AM CDT	Areal Flood Advisory	DMX	3 hr
Jun 26, 8:29 AM CDT	Flash Flood Warning	DMX	5 hr
Jun 26, 9:53 AM CDT	Mesoscale Discussion	SPC	97 min
Jun 26, 10:46 AM CDT	Wind Advisory	DMX	3 hr
Jun 26, 12:05 PM CDT	Mesoscale Discussion	SPC	55 min
Jun 28, 3:30 AM CDT	Wind Advisory	DMX	15 hr
Jul 6, 2:36 PM CDT	Mesoscale Discussion	SPC	114 min
Jul 6, 3:05 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 6, 4:57 PM CDT	Flash Flood Warning	DMX	5 hr
Jul 6, 6:54 PM CDT	Mesoscale Discussion	SPC	66 min
Jul 6, 11:13 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 7, 1:05 PM CDT	Mesoscale Discussion	SPC	115 min
Jul 7, 1:51 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 7, 3:14 PM CDT	Mesoscale Discussion	SPC	91 min
Jul 7, 3:35 PM CDT	Flash Flood Watch	DMX	5 hr
Jul 7, 5:55 PM CDT	Mesoscale Discussion	SPC	95 min
Jul 11, 3:13 PM CDT	Mesoscale Discussion	SPC	92 min
Jul 11, 5:08 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 11, 8:29 PM CDT	Mesoscale Discussion	SPC	91 min
Jul 12, 3:26 AM CDT	Mesoscale Discussion	SPC	64 min
Jul 17, 5:50 PM CDT	Mesoscale Discussion	SPC	85 min
Jul 19, 1:09 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 19, 5:22 PM CDT	Tornado Watch	SPC	5 hr
Jul 20, 3:10 PM CDT	Flash Flood Watch	DMX	14 hr
Jul 20, 8:58 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 20, 11:25 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 21, 1:10 AM CDT	Severe Thunderstorm Warning	DMX	65 min
Jul 21, 1:47 AM CDT	Flash Flood Warning	DMX	4 hr
Jul 21, 2:10 AM CDT	Tornado Warning	DMX	50 min
Jul 21, 3:10 AM CDT	Mesoscale Discussion	SPC	95 min
Jul 23, 10:45 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 24, 1:46 AM CDT	Mesoscale Discussion	SPC	89 min
Jul 26, 4:22 AM CDT	Flash Flood Watch	DMX	10 hr
Jul 27, 1:02 PM CDT	Mesoscale Discussion	SPC	118 min
Jul 27, 2:29 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 27, 6:22 PM CDT	Mesoscale Discussion	SPC	83 min
Jul 28, 5:31 AM CDT	Mesoscale Discussion	SPC	89 min
Jul 28, 6:03 AM CDT	Severe Thunderstorm Warning	DMX	42 min
Aug 3, 3:53 AM CDT	Heat Advisory	DMX	39 hr
Aug 13, 8:00 PM CDT	Severe Thunderstorm Warning	DMX	45 min
Aug 13, 8:46 PM CDT	Severe Thunderstorm Warning	DMX	44 min
Aug 27, 4:40 AM CDT	Mesoscale Discussion	SPC	95 min
Aug 27, 10:16 PM CDT	Mesoscale Discussion	SPC	119 min
Sep 6, 2:45 AM CDT	Dense Fog Advisory	DMX	8 hr
Sep 7, 3:14 AM CDT	Dense Fog Advisory	DMX	6 hr
Sep 23, 12:31 PM CDT	Mesoscale Discussion	SPC	119 min
Sep 24, 6:56 AM CDT	Dense Fog Advisory	DMX	3 hr
Oct 1, 3:27 PM CDT	Frost Advisory	DMX	17 hr
Oct 13, 3:58 PM CDT	Frost Advisory	DMX	17 hr
Oct 15, 3:44 PM CDT	Freeze Warning	DMX	17 hr
Oct 18, 3:08 AM CDT	Dense Fog Advisory	DMX	7 hr
Oct 22, 3:49 PM CDT	Flood Watch	DMX	11 hr
Oct 25, 2:59 PM CDT	High Wind Watch	DMX	12 hr
Oct 26, 3:27 AM CDT	High Wind Warning	DMX	16 hr
Nov 5, 2:51 PM CST	Mesoscale Discussion	SPC	114 min
Nov 10, 3:55 PM CST	Winter Weather Advisory	DMX	23 hr
Nov 12, 1:54 AM CST	Dense Fog Advisory	DMX	8 hr
Dec 7, 4:04 AM CST	Winter Storm Watch	DMX	36 hr
Dec 8, 4:18 PM CST	Winter Weather Advisory	DMX	26 hr
Dec 14, 3:38 AM CST	Wind Chill Advisory	DMX	44 hr
Dec 14, 3:54 AM CST	Wind Advisory	DMX	17 hr
Dec 14, 9:30 PM CST	Winter Weather Advisory	DMX	11 hr
Dec 15, 3:39 PM CST	Winter Weather Advisory	DMX	29 hr
Dec 16, 3:51 PM CST	Winter Storm Watch	DMX	36 hr
Dec 17, 3:51 PM CST	Winter Storm Warning	DMX	41 hr
Dec 18, 6:37 PM CST	Mesoscale Discussion	SPC	5 hr
Dec 18, 11:38 PM CST	Mesoscale Discussion	SPC	4 hr
Dec 19, 4:17 PM CST	Winter Storm Watch	DMX	12 hr
Dec 20, 3:48 AM CST	Blizzard Warning	DMX	38 hr
Dec 20, 3:48 AM CST	Winter Weather Advisory	DMX	14 hr
Dec 21, 3:46 AM CST	Wind Chill Warning	DMX	24 hr
Dec 26, 11:15 AM CST	Dense Fog Advisory	DMX	16 hr
Dec 30, 3:35 AM CST	Wind Advisory	DMX	17 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	2
Severe Thunderstorm Watch	14
Tornado Watch	10
Mesoscale Discussion	49
Flooding
Areal Flood Warning	8
Flash Flood Warning	8
Flash Flood Watch	12
Flood Watch	2
Areal Flood Advisory	3
Winter
Blizzard Warning	1
Winter Storm Warning	2
Blizzard Watch	1
Winter Storm Watch	3
Blowing Snow Advisory	2
Snow Advisory	3
Snow and Blowing Snow Advisory	1
Winter Weather Advisory	7
Heat
Heat Advisory	1
Cold
Freeze Warning	1
Wind Chill Warning	3
Frost Advisory	2
Wind Chill Advisory	8
Wind and dust
High Wind Warning	2
High Wind Watch	1
Wind Advisory	14
Fog and smoke
Air Stagnation Advisory	1
Dense Fog Advisory	11
Freezing Fog Advisory	1

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2007 2009

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.