Alert archive / Iowa / Black Hawk County

Weather alerts in Black Hawk County, Iowa, 2013

142 weather alerts in 2013, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Black Hawk County and its neighbors

Each county as a circle sized by its count in 2013. Tap one for its archive.

Alerts
142
Warnings
53
Watches
23
Advisories
34
Busiest month
May36 alerts
Busiest day
May 20, 20139 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 6 tornado warnings covering Black Hawk County in 2013 had a tornado report inside them.

Black Hawk County, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings60100%0
Severe thunderstorm warnings17759%16100%15 min
Flash flood warnings3233%5100%86 min

Each office's whole area, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Des Moines, IA: tornado warnings26677%2080%13 min
NWS Des Moines, IA: severe thunderstorm warnings25213148%42276%21 min
NWS Des Moines, IA: flash flood warnings543143%9690%123 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 10, 3:31 PM CSTDense Fog AdvisoryDMX29 hr
Jan 18, 12:07 PM CSTWind AdvisoryDMX5 hr
Jan 18, 3:38 PM CSTWind AdvisoryDMX32 hr
Jan 20, 3:38 AM CSTWind Chill WarningDMX32 hr
Jan 21, 12:13 PM CSTWind Chill AdvisoryDMX19 hr
Jan 23, 3:53 AM CSTWind Chill AdvisoryDMX26 hr
Jan 26, 3:35 AM CSTWinter Storm WatchDMX11 hr
Jan 26, 3:01 PM CSTWinter Storm WarningDMX33 hr
Jan 27, 6:40 AM CSTMesoscale DiscussionSPC5 hr
Jan 27, 8:56 PM CSTDense Fog AdvisoryDMX33 hr
Jan 28, 9:59 PM CSTMesoscale DiscussionSPC2 hr
Jan 29, 3:59 AM CSTWinter Storm WatchDMX8 hr
Jan 29, 12:01 PM CSTWinter Storm WarningDMX24 hr
Jan 30, 3:18 AM CSTMesoscale DiscussionSPC5 hr
Jan 30, 3:54 AM CSTWind Chill AdvisoryDMX56 hr
Feb 6, 3:48 PM CSTFreezing Rain AdvisoryDMX6 hr
Feb 9, 3:26 PM CSTWinter Weather AdvisoryDMX20 hr
Feb 9, 11:53 PM CSTMesoscale DiscussionSPC5 hr
Feb 10, 3:32 PM CSTWind AdvisoryDMX24 hr
Feb 19, 4:01 AM CSTWinter Storm WatchDMX35 hr
Feb 20, 3:44 AM CSTWinter Storm WarningDMX56 hr
Feb 24, 4:17 AM CSTDense Fog AdvisoryDMX3 hr
Feb 25, 4:15 PM CSTWinter Storm WarningDMX44 hr
Feb 25, 4:15 PM CSTWinter Weather AdvisoryDMX18 hr
Mar 2, 3:16 PM CSTWinter Storm WatchDMX24 hr
Mar 3, 3:18 PM CSTWinter Storm WarningDMX44 hr
Mar 4, 3:20 PM CSTWinter Weather AdvisoryDMX24 hr
Mar 9, 3:17 PM CSTWinter Storm WatchDMX12 hr
Mar 9, 7:01 PM CSTDense Fog AdvisoryDMX11 hr
Mar 10, 4:21 AM CDTWinter Storm WarningDMX29 hr
Mar 10, 4:21 AM CDTWinter Weather AdvisoryDMX32 hr
Mar 10, 1:16 PM CDTMesoscale DiscussionSPC5 hr
Mar 11, 9:25 PM CDTRiver Flood WarningDMX53 hr
Mar 17, 3:43 PM CDTWinter Weather AdvisoryDMX36 hr
Mar 30, 10:14 PM CDTDense Fog AdvisoryDMX11 hr
Apr 9, 9:10 AM CDTSevere Thunderstorm WarningDMX35 min
Apr 9, 4:14 PM CDTFlash Flood WatchDMX27 hr
Apr 9, 7:37 PM CDTMesoscale DiscussionSPC83 min
Apr 29, 8:29 AM CDTSevere Thunderstorm WarningDMX46 min
Apr 29, 9:16 AM CDTSevere Thunderstorm WarningDMX44 min
Apr 29, 7:26 PM CDTMesoscale DiscussionSPC3 hr
Apr 29, 10:21 PM CDTSevere Thunderstorm WatchSPC5 hr
Apr 30, 1:05 AM CDTMesoscale DiscussionSPC55 min
Apr 30, 1:13 AM CDTSevere Thunderstorm WarningDMX32 min
May 1, 4:13 PM CDTWinter Weather AdvisoryDMX44 hr
May 4, 10:34 AM CDTRiver Flood WarningDMX7 days
May 4, 3:36 PM CDTDense Fog AdvisoryDMX15 hr
May 11, 4:02 AM CDTFrost AdvisoryDMX28 hr
May 19, 11:30 AM CDTMesoscale DiscussionSPC90 min
May 19, 1:10 PM CDTTornado WatchSPC8 hr
May 19, 5:04 PM CDTMesoscale DiscussionSPC56 min
May 19, 8:20 PM CDTSevere Thunderstorm WarningDMX40 min
May 19, 8:31 PM CDTSevere Thunderstorm WarningDMX44 min
May 19, 9:07 PM CDTSevere Thunderstorm WarningDMX23 min
May 19, 9:11 PM CDTSevere Thunderstorm WarningDMX49 min
May 20, 12:31 AM CDTRiver Flood WarningDMX6 days
May 20, 12:31 AM CDTRiver Flood WarningDMX5 days
May 20, 10:47 AM CDTRiver Flood WarningDMX4 days
May 20, 10:47 AM CDTRiver Flood WarningDMX55 hr
May 20, 6:35 PM CDTSevere Thunderstorm WatchSPC5 hr
May 20, 8:26 PM CDTSevere Thunderstorm WarningDMX49 min
May 20, 9:33 PM CDTMesoscale DiscussionSPC57 min
May 25, 3:39 PM CDTFlash Flood WatchDMX21 hr
May 26, 10:54 AM CDTRiver Flood WarningDMX10 days
May 26, 3:51 PM CDTFlash Flood WatchDMX41 hr
May 26, 10:24 PM CDTRiver Flood WarningDMX7 days
May 27, 7:54 AM CDTRiver Flood WarningDMX65 hr
May 27, 10:19 AM CDTRiver Flood WarningDMX4 days
May 27, 10:19 AM CDTRiver Flood WarningDMX3 days
May 29, 11:01 AM CDTFlash Flood WatchDMX56 hr
May 29, 2:39 PM CDTMesoscale DiscussionSPC66 min
May 29, 2:56 PM CDTSevere Thunderstorm WatchSPC7 hr
May 29, 3:28 PM CDTSevere Thunderstorm WarningDMX62 min
May 29, 4:16 PM CDTSevere Thunderstorm WarningDMX44 min
May 29, 4:27 PM CDTFlash Flood WarningDMX6 hr
May 29, 5:00 PM CDTSevere Thunderstorm WarningDMX45 min
May 29, 5:54 PM CDTMesoscale DiscussionSPC66 min
May 29, 6:56 PM CDTSevere Thunderstorm WarningDMX34 min
May 29, 10:00 PM CDTRiver Flood WarningDMX59 hr
May 29, 10:25 PM CDTAreal Flood WarningDMX24 hr
Jun 10, 4:54 AM CDTDense Fog AdvisoryDMX4 hr
Jun 12, 12:49 PM CDTMesoscale DiscussionSPC56 min
Jun 12, 1:49 PM CDTTornado Watch PDSSPC9 hr
Jun 12, 4:06 PM CDTMesoscale DiscussionSPC54 min
Jun 12, 4:49 PM CDTTornado WarningDMX26 min
Jun 12, 4:54 PM CDTTornado WarningDMX36 min
Jun 12, 5:29 PM CDTTornado WarningDMX31 min
Jun 12, 5:44 PM CDTTornado WarningDMX31 min
Jun 12, 6:40 PM CDTTornado WarningDMX35 min
Jun 12, 6:40 PM CDTMesoscale DiscussionSPC95 min
Jun 12, 7:10 PM CDTTornado WarningDMX35 min
Jun 12, 8:11 PM CDTSevere Thunderstorm WarningDMX19 min
Jun 12, 8:53 PM CDTMesoscale DiscussionSPC37 min
Jun 13, 10:11 AM CDTRiver Flood WarningDMX5 days
Jun 13, 10:11 AM CDTRiver Flood WarningDMX4 days
Jun 13, 10:11 AM CDTRiver Flood WarningDMX54 hr
Jun 14, 3:53 AM CDTFlash Flood WatchDMX39 hr
Jun 15, 10:54 AM CDTMesoscale DiscussionSPC66 min
Jun 21, 7:27 AM CDTSevere Thunderstorm WarningDMX48 min
Jun 21, 9:08 AM CDTFlash Flood WarningDMX6 hr
Jun 22, 2:33 AM CDTMesoscale DiscussionSPC87 min
Jun 23, 3:45 AM CDTFlash Flood WatchDMX12 hr
Jun 24, 3:41 AM CDTFlash Flood WatchDMX51 hr
Jun 24, 10:12 AM CDTRiver Flood WarningDMX7 days
Jun 24, 3:15 PM CDTFlash Flood WatchDMX39 hr
Jun 24, 4:09 PM CDTRiver Flood WarningDMX3 days
Jun 24, 4:23 PM CDTRiver Flood WarningDMX4 days
Jun 25, 3:15 PM CDTMesoscale DiscussionSPC3 hr
Jun 25, 9:44 PM CDTMesoscale DiscussionSPC91 min
Jun 25, 10:41 PM CDTSevere Thunderstorm WatchSPC5 hr
Jun 25, 11:37 PM CDTSevere Thunderstorm WarningDMX23 min
Jun 26, 2:02 AM CDTFlash Flood WarningDMX6 hr
Jun 26, 3:32 AM CDTMesoscale DiscussionSPC88 min
Jun 26, 1:02 PM CDTMesoscale DiscussionSPC118 min
Jul 22, 3:33 PM CDTSevere Thunderstorm WatchSPC6 hr
Jul 22, 6:20 PM CDTSevere Thunderstorm WarningDMX55 min
Jul 25, 1:39 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 25, 6:42 PM CDTMesoscale DiscussionSPC93 min
Jul 25, 8:06 PM CDTMesoscale DiscussionSPC54 min
Aug 6, 5:28 AM CDTDense Fog AdvisoryDMX6 hr
Aug 6, 9:37 PM CDTMesoscale DiscussionSPC113 min
Aug 11, 5:00 PM CDTMesoscale DiscussionSPC60 min
Aug 11, 6:58 PM CDTSpecial Weather StatementDVN62 min
Aug 21, 12:41 PM CDTMesoscale DiscussionSPC94 min
Aug 23, 3:27 AM CDTDense Fog AdvisoryDMX6 hr
Aug 25, 3:24 AM CDTHeat AdvisoryDMX6 days
Oct 3, 8:16 PM CDTSevere Thunderstorm WatchSPC9 hr
Oct 4, 2:06 AM CDTMesoscale DiscussionSPC84 min
Oct 4, 10:29 PM CDTMesoscale DiscussionSPC91 min
Oct 30, 3:56 AM CDTDense Fog AdvisoryDMX10 hr
Nov 21, 12:03 PM CSTWinter Weather AdvisoryDMX14 hr
Dec 3, 5:39 AM CSTDense Fog AdvisoryDMX33 hr
Dec 6, 3:35 PM CSTWind Chill AdvisoryDMX17 hr
Dec 7, 3:42 PM CSTWinter Weather AdvisoryDMX32 hr
Dec 10, 3:38 PM CSTWinter Weather AdvisoryDMX17 hr
Dec 19, 3:11 AM CSTFreezing Rain AdvisoryDMX33 hr
Dec 19, 4:01 PM CSTWinter Storm WatchDMX36 hr
Dec 20, 2:57 PM CSTWinter Storm WarningDMX44 hr
Dec 21, 10:41 PM CSTMesoscale DiscussionSPC5 hr
Dec 22, 3:16 PM CSTWind Chill AdvisoryDMX45 hr
Dec 28, 4:20 AM CSTWind Chill AdvisoryDMX47 hr
Dec 30, 4:10 PM CSTWinter Weather AdvisoryDMX29 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 archive20122014

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.