Alert archive / Iowa / Butler County

Weather alerts in Butler County, Iowa, 2016

121 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Butler County and its neighbors

Each county as a circle sized by its count in 2016. Tap one for its archive.

Alerts
121
Warnings
36
Watches
21
Advisories
33
Busiest month
September26 alerts
Busiest day
September 21, 20167 alerts

Over time

By month

Warning verification

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

3 of 6 tornado warnings covering Butler County in 2016 had a tornado report inside them; 3 of 3 tornado reports fell inside a warning, on average 7 minutes after it went out.

Butler County, 2016

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings6350%3100%7 min
Severe thunderstorm warnings8363%944%19 min
Flash flood warnings550%978%263 min

Each office's whole area, 2016

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Des Moines, IA: tornado warnings191142%2365%16 min
NWS Des Moines, IA: severe thunderstorm warnings1627951%24665%21 min
NWS Des Moines, IA: flash flood warnings392828%6484%135 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, 4:45 AM CSTDense Fog AdvisoryDMX14 hr
Jan 8, 9:45 PM CSTWinter Weather AdvisoryDMX6 hr
Jan 9, 3:55 AM CSTWind Chill AdvisoryDMX32 hr
Jan 11, 3:49 AM CSTWind Chill AdvisoryDMX32 hr
Jan 11, 8:55 PM CSTWinter Weather AdvisoryDMX7 hr
Jan 16, 3:29 AM CSTWind Chill WarningDMX54 hr
Jan 24, 3:17 PM CSTWinter Weather AdvisoryDMX33 hr
Jan 31, 3:48 AM CSTBlizzard WatchDMX25 hr
Feb 1, 4:21 AM CSTWinter Storm WarningDMX50 hr
Feb 1, 9:50 AM CSTDense Fog AdvisoryDMX5 hr
Feb 1, 7:17 PM CSTDense Fog AdvisoryDMX8 hr
Feb 2, 7:50 AM CSTMesoscale DiscussionSPC4 hr
Feb 5, 3:50 PM CSTBlizzard WatchDMX36 hr
Feb 7, 3:31 AM CSTBlizzard WarningDMX38 hr
Feb 12, 3:30 AM CSTWind Chill AdvisoryDMX29 hr
Feb 13, 3:58 AM CSTWinter Weather AdvisoryDMX34 hr
Feb 18, 3:48 PM CSTWind AdvisoryDMX26 hr
Feb 19, 8:54 AM CSTHigh Wind WarningDMX6 hr
Feb 29, 3:34 AM CSTWinter Weather AdvisoryDMX28 hr
Feb 29, 8:49 PM CSTMesoscale DiscussionSPC6 hr
Mar 13, 10:15 PM CDTDense Fog AdvisoryDMX14 hr
Mar 15, 3:37 AM CDTHigh Wind WatchDMX11 hr
Mar 15, 3:05 PM CDTHigh Wind WarningDMX22 hr
Mar 15, 3:05 PM CDTWind AdvisoryDMX28 hr
Mar 23, 3:24 AM CDTWinter Weather AdvisoryDMX30 hr
Apr 1, 3:37 PM CDTWind AdvisoryDMX24 hr
Apr 23, 3:37 AM CDTDense Fog AdvisoryDMX3 hr
Apr 24, 11:28 PM CDTSpecial Weather StatementDMX62 min
May 14, 3:41 AM CDTFrost AdvisoryDMX27 hr
May 28, 1:37 PM CDTSevere Thunderstorm WatchSPC7 hr
May 28, 5:33 PM CDTMesoscale DiscussionSPC57 min
Jun 1, 3:42 AM CDTDense Fog AdvisoryDMX3 hr
Jun 3, 3:06 PM CDTMesoscale DiscussionSPC114 min
Jun 11, 2:47 AM CDTSevere Thunderstorm WarningDMX43 min
Jun 14, 10:51 AM CDTFlash Flood WatchDMX10 hr
Jun 14, 11:45 AM CDTMesoscale DiscussionSPC2 hr
Jun 14, 12:43 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 14, 2:51 PM CDTMesoscale DiscussionSPC114 min
Jun 14, 7:00 PM CDTMesoscale DiscussionSPC60 min
Jun 15, 4:12 AM CDTAreal Flood WarningDMX24 hr
Jun 21, 3:46 PM CDTFlash Flood WatchDMX17 hr
Jun 21, 11:18 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 22, 12:53 AM CDTFlash Flood WarningDMX6 hr
Jun 22, 2:31 AM CDTMesoscale DiscussionSPC119 min
Jun 22, 9:06 PM CDTMesoscale DiscussionSPC114 min
Jun 25, 9:57 PM CDTMesoscale DiscussionSPC3 hr
Jun 30, 1:29 PM CDTMesoscale DiscussionSPC3 hr
Jun 30, 1:37 PM CDTSpecial Weather StatementDMX38 min
Jul 5, 9:50 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 7, 12:30 AM CDTMesoscale DiscussionSPC90 min
Jul 7, 12:47 AM CDTSevere Thunderstorm WatchSPC4 hr
Jul 7, 6:30 PM CDTMesoscale DiscussionSPC2 hr
Jul 10, 7:34 AM CDTMesoscale DiscussionSPC86 min
Jul 11, 8:43 PM CDTMesoscale DiscussionSPC92 min
Jul 11, 11:24 PM CDTSpecial Weather StatementDMX51 min
Jul 16, 9:43 PM CDTFlash Flood WatchDMX9 hr
Jul 17, 2:06 AM CDTMesoscale DiscussionSPC2 hr
Jul 17, 10:05 AM CDTSevere Thunderstorm WarningDMX40 min
Jul 17, 11:04 AM CDTSevere Thunderstorm WarningDMX31 min
Jul 18, 3:43 PM CDTExcessive Heat WatchDMX36 hr
Jul 19, 4:24 PM CDTExcessive Heat WarningDMX4 days
Jul 22, 2:39 PM CDTMesoscale DiscussionSPC3 hr
Aug 3, 2:58 AM CDTDense Fog AdvisoryDMX5 hr
Aug 4, 10:37 AM CDTSevere Thunderstorm WarningDMX38 min
Aug 4, 11:10 AM CDTSevere Thunderstorm WarningDMX65 min
Aug 4, 4:44 PM CDTSevere Thunderstorm WatchSPC6 hr
Aug 4, 4:48 PM CDTMesoscale DiscussionSPC87 min
Aug 4, 5:58 PM CDTSevere Thunderstorm WarningDMX47 min
Aug 4, 7:17 PM CDTMesoscale DiscussionSPC88 min
Aug 11, 3:46 AM CDTFlash Flood WatchDMX27 hr
Aug 11, 3:55 PM CDTSevere Thunderstorm WatchSPC7 hr
Aug 11, 6:17 PM CDTMesoscale DiscussionSPC58 min
Aug 19, 11:41 AM CDTSevere Thunderstorm WarningDMX49 min
Aug 19, 8:06 PM CDTSpecial Weather StatementDMX54 min
Aug 23, 2:05 PM CDTMesoscale DiscussionSPC55 min
Aug 25, 8:38 AM CDTAreal Flood WarningDMX24 hr
Sep 6, 3:28 PM CDTFlash Flood WatchDMX31 hr
Sep 6, 3:47 PM CDTMesoscale DiscussionSPC2 hr
Sep 6, 7:00 PM CDTSevere Thunderstorm WatchSPC7 hr
Sep 9, 11:31 AM CDTFlash Flood WarningDMX6 hr
Sep 9, 11:40 AM CDTFlash Flood WatchDMX6 hr
Sep 15, 3:35 PM CDTFlash Flood WatchDMX13 hr
Sep 15, 7:01 PM CDTSpecial Weather StatementDMX44 min
Sep 15, 7:48 PM CDTSpecial Weather StatementDMX57 min
Sep 20, 3:32 PM CDTFlash Flood WatchDMX69 hr
Sep 21, 2:00 PM CDTMesoscale DiscussionSPC2 hr
Sep 21, 5:13 PM CDTSevere Thunderstorm WarningDMX47 min
Sep 21, 5:19 PM CDTTornado WarningDMX56 min
Sep 21, 6:01 PM CDTMesoscale DiscussionSPC2 hr
Sep 21, 6:17 PM CDTTornado WarningDMX43 min
Sep 21, 6:58 PM CDTFlash Flood WarningDMX12 hr
Sep 21, 6:59 PM CDTTornado WarningDMX46 min
Sep 21, 7:43 PM CDTTornado WarningDMX47 min
Sep 21, 9:39 PM CDTRiver Flood WarningDMX5 days
Sep 21, 9:41 PM CDTRiver Flood WarningDMX6 days
Sep 22, 7:00 AM CDTFlash Flood WarningDMX4 hr
Sep 22, 11:23 AM CDTAreal Flood WarningDMX24 hr
Sep 22, 11:24 PM CDTFlash Flood WarningDMX6 hr
Sep 23, 5:19 AM CDTAreal Flood WarningDMX6 hr
Sep 23, 11:12 AM CDTAreal Flood WarningDMX48 hr
Sep 24, 3:55 PM CDTFlash Flood WatchDMX15 hr
Sep 25, 4:33 PM CDTRiver Flood WarningDMX3 days
Oct 12, 3:53 AM CDTFreeze WarningDMX29 hr
Oct 15, 3:24 PM CDTDense Fog AdvisoryDMX20 hr
Nov 15, 3:22 AM CSTDense Fog AdvisoryDMX7 hr
Nov 17, 3:42 PM CSTWind AdvisoryDMX38 hr
Nov 27, 2:28 AM CSTDense Fog AdvisoryDMX7 hr
Nov 28, 3:33 PM CSTTornado WarningDMX27 min
Nov 28, 3:59 PM CSTTornado WarningDMX46 min
Dec 3, 3:04 PM CSTWinter Weather AdvisoryDMX21 hr
Dec 9, 11:11 AM CSTWinter Weather AdvisoryDMX40 hr
Dec 10, 2:47 PM CSTWinter Storm WarningDMX14 hr
Dec 14, 3:59 AM CSTWind Chill AdvisoryDMX29 hr
Dec 15, 11:43 AM CSTWinter Weather AdvisoryDMX57 hr
Dec 16, 4:33 AM CSTWind Chill WarningDMX55 hr
Dec 18, 12:09 PM CSTWind Chill AdvisoryDMX16 hr
Dec 22, 2:53 PM CSTWinter Weather AdvisoryDMX27 hr
Dec 23, 3:48 AM CSTMesoscale DiscussionSPC6 hr
Dec 24, 3:46 AM CSTFreezing Rain AdvisoryDMX34 hr
Dec 25, 2:34 PM CSTWind AdvisoryDMX27 hr
Dec 29, 3:40 AM CSTWind AdvisoryDMX13 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 archive20152017

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.