Alert archive / Iowa / Ida County

Weather alerts in Ida County, Iowa, 2011

102 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Ida County and its neighbors

Each county as a circle sized by its count in 2011. Tap one for its archive.

Alerts
102
Warnings
22
Watches
15
Advisories
36
Busiest month
May19 alerts
Busiest day
April 10, 201110 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 2 tornado warnings covering Ida County in 2011 had a tornado report inside them; 1 of 2 tornado reports fell inside a warning, on average 24 minutes after it went out.

Ida County, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings2150%250%24 min
Severe thunderstorm warnings181611%15100%22 min
Flash flood warnings00

Each office's whole area, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Sioux Falls, SD: tornado warnings381074%1573%12 min
NWS Sioux Falls, SD: severe thunderstorm warnings27418732%33789%19 min
NWS Sioux Falls, SD: flash flood warnings362628%5491%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.

IssuedProductOfficeLasted
Jan 8, 2:24 PM CSTWinter Weather AdvisoryFSD64 hr
Jan 11, 3:14 PM CSTWind Chill AdvisoryFSD19 hr
Jan 16, 9:45 PM CSTWinter Weather AdvisoryFSD6 hr
Jan 29, 3:39 PM CSTWinter Weather AdvisoryFSD3 days
Jan 31, 3:17 PM CSTWind Chill WatchFSD46 min
Jan 31, 4:03 PM CSTWind Chill AdvisoryFSD44 hr
Feb 2, 2:58 PM CSTWind Chill AdvisoryFSD15 hr
Feb 3, 5:48 AM CSTWind Chill AdvisoryFSD3 hr
Feb 7, 3:48 AM CSTWind Chill AdvisoryFSD32 hr
Feb 8, 2:37 PM CSTWind Chill AdvisoryFSD21 hr
Feb 16, 5:55 PM CSTDense Fog AdvisoryFSD16 hr
Mar 8, 3:50 AM CSTWinter Weather AdvisoryFSD17 hr
Mar 11, 4:00 AM CSTWind AdvisoryFSD32 hr
Mar 14, 9:18 AM CDTDense Fog AdvisoryFSD3 hr
Mar 21, 10:05 PM CDTMesoscale DiscussionSPC115 min
Mar 22, 2:03 PM CDTTornado WatchSPC7 hr
Apr 3, 4:17 AM CDTWind AdvisoryFSD36 hr
Apr 9, 5:00 PM CDTMesoscale DiscussionSPC60 min
Apr 9, 5:48 PM CDTTornado WatchSPC7 hr
Apr 9, 7:09 PM CDTSevere Thunderstorm WarningFSD36 min
Apr 9, 7:31 PM CDTTornado WarningFSD29 min
Apr 9, 7:44 PM CDTSevere Thunderstorm WarningFSD31 min
Apr 9, 7:46 PM CDTSevere Thunderstorm WarningFSD29 min
Apr 9, 7:56 PM CDTTornado WarningFSD34 min
Apr 9, 8:08 PM CDTSevere Thunderstorm WarningFSD37 min
Apr 9, 8:11 PM CDTSevere Thunderstorm WarningFSD34 min
Apr 9, 8:41 PM CDTSevere Thunderstorm WarningFSD19 min
Apr 9, 9:06 PM CDTMesoscale DiscussionSPC54 min
Apr 10, 12:47 AM CDTSevere Thunderstorm WarningFSD28 min
Apr 29, 3:12 AM CDTWind AdvisoryFSD16 hr
May 1, 3:55 AM CDTWind AdvisoryFSD13 hr
May 11, 2:31 PM CDTMesoscale DiscussionSPC59 min
May 11, 5:03 PM CDTMesoscale DiscussionSPC57 min
May 12, 5:21 PM CDTSevere Thunderstorm WarningFSD24 min
May 12, 5:35 PM CDTMesoscale DiscussionSPC85 min
May 12, 5:45 PM CDTSevere Thunderstorm WarningFSD45 min
May 12, 6:05 PM CDTSevere Thunderstorm WatchSPC7 hr
May 12, 6:28 PM CDTSevere Thunderstorm WarningFSD47 min
May 12, 7:12 PM CDTSevere Thunderstorm WarningFSD28 min
May 15, 3:18 PM CDTFrost AdvisoryFSD17 hr
May 21, 12:51 PM CDTMesoscale DiscussionSPC114 min
May 21, 2:25 PM CDTSevere Thunderstorm WatchSPC10 hr
May 21, 6:07 PM CDTMesoscale DiscussionSPC53 min
May 21, 8:55 PM CDTMesoscale DiscussionSPC65 min
May 24, 3:22 PM CDTFlash Flood WatchFSD22 hr
May 24, 3:30 PM CDTWind AdvisoryFSD27 hr
May 29, 3:54 PM CDTWind AdvisoryFSD27 hr
May 29, 9:24 PM CDTMesoscale DiscussionSPC96 min
May 30, 10:38 PM CDTMesoscale DiscussionSPC2 hr
Jun 7, 3:26 AM CDTWind AdvisoryFSD16 hr
Jun 9, 9:50 AM CDTMesoscale DiscussionSPC55 min
Jun 17, 6:44 PM CDTMesoscale DiscussionSPC91 min
Jun 17, 7:09 PM CDTSevere Thunderstorm WatchSPC3 hr
Jun 20, 6:53 PM CDTTornado WatchSPC6 hr
Jun 20, 9:02 PM CDTMesoscale DiscussionSPC58 min
Jun 20, 9:12 PM CDTSevere Thunderstorm WarningFSD33 min
Jun 20, 9:34 PM CDTSevere Thunderstorm WarningFSD41 min
Jun 26, 6:16 AM CDTMesoscale DiscussionSPC59 min
Jun 26, 7:37 PM CDTSevere Thunderstorm WarningFSD38 min
Jun 26, 8:14 PM CDTSevere Thunderstorm WarningFSD31 min
Jun 26, 8:44 PM CDTSevere Thunderstorm WarningFSD31 min
Jun 26, 8:58 PM CDTHigh Wind WarningFSD4 hr
Jun 29, 3:18 PM CDTHeat AdvisoryFSD28 hr
Jul 5, 3:32 PM CDTMesoscale DiscussionSPC88 min
Jul 10, 11:56 PM CDTSevere Thunderstorm WatchSPC4 hr
Jul 12, 2:09 AM CDTMesoscale DiscussionSPC66 min
Jul 14, 3:31 PM CDTExcessive Heat WatchFSD12 hr
Jul 15, 3:42 AM CDTExcessive Heat WarningFSD6 days
Jul 22, 3:00 PM CDTMesoscale DiscussionSPC90 min
Jul 22, 3:01 PM CDTHeat AdvisoryFSD29 hr
Jul 28, 2:47 PM CDTMesoscale DiscussionSPC118 min
Jul 30, 3:33 PM CDTHeat AdvisoryFSD52 hr
Aug 6, 2:58 PM CDTMesoscale DiscussionSPC3 hr
Aug 6, 5:32 PM CDTSevere Thunderstorm WatchSPC9 hr
Aug 6, 8:10 PM CDTMesoscale DiscussionSPC2 hr
Aug 7, 7:49 PM CDTSevere Thunderstorm WatchSPC7 hr
Aug 7, 10:28 PM CDTMesoscale DiscussionSPC2 hr
Aug 7, 11:52 PM CDTSevere Thunderstorm WarningFSD38 min
Aug 11, 7:19 PM CDTSevere Thunderstorm WatchSPC5 hr
Aug 11, 9:42 PM CDTMesoscale DiscussionSPC63 min
Aug 18, 12:31 PM CDTMesoscale DiscussionSPC89 min
Aug 18, 1:27 PM CDTSevere Thunderstorm WatchSPC8 hr
Aug 18, 2:00 PM CDTSevere Thunderstorm WarningFSD45 min
Aug 22, 1:42 AM CDTMesoscale DiscussionSPC3 hr
Aug 23, 12:45 AM CDTMesoscale DiscussionSPC2 hr
Aug 23, 3:43 AM CDTHeat AdvisoryFSD11 hr
Aug 28, 8:00 AM CDTSevere Thunderstorm WatchSPC5 hr
Aug 28, 10:41 AM CDTMesoscale DiscussionSPC94 min
Aug 31, 6:02 AM CDTDense Fog AdvisoryFSD4 hr
Sep 2, 2:41 PM CDTMesoscale DiscussionSPC94 min
Sep 14, 4:02 AM CDTFrost AdvisoryFSD28 hr
Sep 18, 11:04 PM CDTDense Fog AdvisoryFSD10 hr
Oct 4, 3:13 PM CDTWind AdvisoryFSD3 days
Nov 4, 3:37 AM CDTWind AdvisoryFSD47 hr
Nov 15, 3:26 AM CSTWind AdvisoryFSD14 hr
Nov 19, 3:43 AM CSTWinter Weather AdvisoryFSD14 hr
Nov 22, 10:28 PM CSTDense Fog AdvisoryFSD12 hr
Nov 25, 4:30 AM CSTWind AdvisoryFSD41 hr
Dec 2, 3:28 AM CSTWinter Weather AdvisoryFSD45 hr
Dec 3, 10:37 AM CSTMesoscale DiscussionSPC5 hr
Dec 30, 3:15 PM CSTWind AdvisoryFSD57 hr
Dec 31, 3:48 AM CSTWinter Weather AdvisoryFSD20 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordForecastThe radar archive20102012

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.