Alert archive / Iowa / Humboldt County

Weather alerts in Humboldt County, Iowa, 2011

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

Humboldt County and its neighbors

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

Alerts
112
Warnings
34
Watches
16
Advisories
39
Busiest month
July20 alerts
Busiest day
April 10, 20117 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 Humboldt County in 2011 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 28 minutes after it went out.

Humboldt County, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings2150%2100%28 min
Severe thunderstorm warnings12742%1100%21 min
Flash flood warnings00

Each office's whole area, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Des Moines, IA: tornado warnings581967%5375%27 min
NWS Des Moines, IA: severe thunderstorm warnings31317444%46874%22 min
NWS Des Moines, IA: flash flood warnings341362%3087%136 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 7, 3:22 PM CSTWinter Weather AdvisoryDMX6 hr
Jan 7, 4:19 PM CSTBlizzard WarningDMX5 hr
Jan 9, 3:20 PM CSTWinter Weather AdvisoryDMX51 hr
Jan 16, 3:38 PM CSTWinter Weather AdvisoryDMX26 hr
Jan 20, 3:46 AM CSTWind Chill AdvisoryDMX30 hr
Jan 29, 4:07 PM CSTWinter Storm WatchDMX12 hr
Jan 30, 4:01 AM CSTWinter Weather AdvisoryDMX68 hr
Feb 1, 4:02 AM CSTWind Chill AdvisoryDMX32 hr
Feb 2, 3:09 PM CSTWind Chill AdvisoryDMX18 hr
Feb 7, 3:35 AM CSTWind Chill AdvisoryDMX32 hr
Feb 8, 3:44 PM CSTWind Chill AdvisoryDMX20 hr
Feb 16, 6:00 PM CSTDense Fog AdvisoryDMX16 hr
Feb 18, 7:54 PM CSTRiver Flood WarningDMX8 days
Feb 19, 4:20 PM CSTWinter Weather AdvisoryDMX17 hr
Feb 20, 4:35 AM CSTMesoscale DiscussionSPC6 hr
Mar 8, 4:15 AM CSTWinter Storm WatchDMX11 hr
Mar 8, 3:39 PM CSTWinter Weather AdvisoryDMX18 hr
Mar 11, 3:20 PM CSTWind AdvisoryDMX21 hr
Mar 16, 7:51 PM CDTRiver Flood WarningDMX7 days
Mar 19, 3:19 AM CDTDense Fog AdvisoryDMX7 hr
Mar 21, 10:05 PM CDTMesoscale DiscussionSPC115 min
Mar 22, 10:52 AM CDTRiver Flood WarningDMX25 days
Mar 22, 4:34 PM CDTSevere Thunderstorm WarningDMX13 min
Apr 3, 3:47 PM CDTWind AdvisoryDMX26 hr
Apr 9, 5:00 PM CDTMesoscale DiscussionSPC60 min
Apr 9, 5:48 PM CDTTornado WatchSPC7 hr
Apr 9, 9:06 PM CDTMesoscale DiscussionSPC54 min
Apr 9, 10:28 PM CDTTornado WarningDMX47 min
Apr 9, 10:43 PM CDTMesoscale DiscussionSPC62 min
Apr 9, 10:54 PM CDTTornado WarningDMX51 min
Apr 9, 11:01 PM CDTTornado WatchSPC5 hr
Apr 10, 1:26 AM CDTMesoscale DiscussionSPC64 min
Apr 10, 1:38 AM CDTSevere Thunderstorm WarningDMX52 min
Apr 19, 10:14 AM CDTRiver Flood WarningDMX6 days
Apr 20, 8:39 PM CDTRiver Flood WarningDMX4 days
Apr 25, 8:57 PM CDTRiver Flood WarningDMX5 days
Apr 26, 10:25 AM CDTRiver Flood WarningDMX44 hr
May 1, 3:36 PM CDTFrost AdvisoryDMX16 hr
May 2, 3:48 PM CDTFrost AdvisoryDMX15 hr
May 3, 4:05 PM CDTFreeze WarningDMX15 hr
May 15, 3:24 PM CDTFrost AdvisoryDMX16 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 22, 9:19 AM CDTRiver Flood WarningDMX11 days
May 22, 9:19 AM CDTRiver Flood WarningDMX12 days
May 25, 4:22 AM CDTWind AdvisoryDMX17 hr
May 30, 3:41 AM CDTWind AdvisoryDMX15 hr
Jun 4, 4:50 AM CDTSevere Thunderstorm WarningDMX40 min
Jun 5, 5:17 PM CDTMesoscale DiscussionSPC88 min
Jun 7, 4:05 AM CDTWind AdvisoryDMX15 hr
Jun 9, 7:10 PM CDTSevere Thunderstorm WarningDMX50 min
Jun 16, 3:56 AM CDTRiver Flood WarningDMX16 days
Jun 16, 10:19 PM CDTRiver Flood WarningDMX20 days
Jun 20, 5:55 PM CDTMesoscale DiscussionSPC65 min
Jun 20, 6:53 PM CDTTornado WatchSPC6 hr
Jun 20, 10:22 PM CDTMesoscale DiscussionSPC83 min
Jun 20, 10:57 PM CDTSevere Thunderstorm WarningDMX48 min
Jun 26, 9:46 PM CDTHigh Wind WarningDMX5 hr
Jun 29, 3:44 AM CDTExcessive Heat WatchDMX12 hr
Jun 29, 3:38 PM CDTHeat AdvisoryDMX51 hr
Jul 1, 7:35 PM CDTMesoscale DiscussionSPC55 min
Jul 1, 8:00 PM CDTSevere Thunderstorm WarningDMX45 min
Jul 1, 8:07 PM CDTSevere Thunderstorm WatchSPC5 hr
Jul 5, 3:32 PM CDTMesoscale DiscussionSPC88 min
Jul 5, 3:36 PM CDTSevere Thunderstorm WarningDMX39 min
Jul 5, 4:45 PM CDTSevere Thunderstorm WarningDMX45 min
Jul 7, 7:57 PM CDTRiver Flood WarningDMX25 hr
Jul 11, 1:08 AM CDTSevere Thunderstorm WatchSPC13 min
Jul 11, 1:21 AM CDTSevere Thunderstorm WatchSPC4 hr
Jul 11, 2:36 AM CDTMesoscale DiscussionSPC114 min
Jul 11, 2:52 AM CDTSevere Thunderstorm WarningDMX38 min
Jul 13, 10:47 AM CDTRiver Flood WarningDMX11 days
Jul 14, 3:37 PM CDTExcessive Heat WatchDMX24 hr
Jul 15, 9:46 AM CDTRiver Flood WarningDMX57 hr
Jul 15, 2:21 PM CDTMesoscale DiscussionSPC114 min
Jul 15, 3:32 PM CDTExcessive Heat WarningDMX6 days
Jul 22, 3:00 PM CDTMesoscale DiscussionSPC90 min
Jul 22, 4:12 PM CDTHeat AdvisoryDMX24 hr
Jul 28, 2:47 PM CDTMesoscale DiscussionSPC118 min
Jul 30, 3:47 PM CDTHeat AdvisoryDMX72 hr
Aug 23, 12:45 AM CDTMesoscale DiscussionSPC2 hr
Aug 23, 2:25 AM CDTSevere Thunderstorm WarningDMX65 min
Aug 23, 2:49 AM CDTSevere Thunderstorm WarningDMX41 min
Aug 23, 3:00 AM CDTSevere Thunderstorm WatchSPC6 hr
Aug 23, 4:55 AM CDTMesoscale DiscussionSPC2 hr
Aug 28, 8:00 AM CDTSevere Thunderstorm WatchSPC5 hr
Aug 31, 3:45 AM CDTDense Fog AdvisoryDMX5 hr
Aug 31, 9:07 AM CDTDense Fog AdvisoryDMX108 min
Sep 2, 3:27 AM CDTMesoscale DiscussionSPC93 min
Sep 2, 3:48 AM CDTSevere Thunderstorm WatchSPC6 hr
Sep 2, 4:27 AM CDTSevere Thunderstorm WarningDMX48 min
Sep 2, 2:41 PM CDTMesoscale DiscussionSPC94 min
Sep 14, 3:52 AM CDTFrost AdvisoryDMX28 hr
Sep 18, 10:54 PM CDTDense Fog AdvisoryDMX10 hr
Sep 28, 3:50 PM CDTWind AdvisoryDMX27 hr
Sep 30, 3:29 PM CDTFrost AdvisoryDMX17 hr
Oct 7, 4:08 AM CDTWind AdvisoryDMX15 hr
Oct 11, 3:06 AM CDTDense Fog AdvisoryDMX7 hr
Oct 11, 10:11 AM CDTDense Fog AdvisoryDMX65 min
Oct 18, 9:30 PM CDTFreeze WarningDMX11 hr
Nov 7, 3:09 PM CSTWinter Storm WatchDMX13 hr
Nov 8, 3:42 AM CSTWinter Weather AdvisoryDMX29 hr
Nov 15, 3:25 AM CSTWind AdvisoryDMX14 hr
Nov 19, 10:16 AM CSTWinter Weather AdvisoryDMX5 hr
Nov 25, 3:31 PM CSTWind AdvisoryDMX29 hr
Dec 2, 3:49 AM CSTWinter Storm WatchDMX24 hr
Dec 3, 3:40 AM CSTWinter Weather AdvisoryDMX20 hr
Dec 3, 10:37 AM CSTMesoscale DiscussionSPC5 hr
Dec 3, 6:15 PM CSTWinter Storm WarningDMX6 hr
Dec 14, 3:16 PM CSTDense Fog AdvisoryDMX5 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.