Alert archive / Iowa / Iowa County

Weather alerts in Iowa County, Iowa, 2017

113 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Iowa County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts
113
Warnings
25
Watches
21
Advisories
30
Busiest month
July24 alerts
Busiest day
May 17, 20176 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 Iowa County in 2017 had a tornado report inside them; 1 of 2 tornado reports fell inside a warning, on average 1 minutes after it went out.

Iowa County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings2150%250%1 min
Severe thunderstorm warnings131115%1060%35 min
Flash flood warnings00

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Quad Cities, IA: tornado warnings522160%5254%16 min
NWS Quad Cities, IA: severe thunderstorm warnings19715223%50578%27 min
NWS Quad Cities, IA: flash flood warnings251540%3887%113 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 2, 4:31 PM CSTDense Fog AdvisoryDVN15 hr
Jan 10, 9:41 AM CSTWind AdvisoryDVN11 hr
Jan 12, 3:33 PM CSTWinter Storm WatchDVN48 hr
Jan 14, 3:47 PM CSTWinter Weather AdvisoryDVN47 hr
Jan 16, 4:30 PM CSTDense Fog AdvisoryDVN14 hr
Jan 16, 10:08 PM CSTRiver Flood WarningDVN5 days
Jan 19, 1:46 AM CSTDense Fog AdvisoryDVN10 hr
Jan 19, 3:26 PM CSTDense Fog AdvisoryDVN21 hr
Jan 20, 3:14 PM CSTDense Fog AdvisoryDVN21 hr
Jan 21, 3:50 PM CSTDense Fog AdvisoryDVN19 hr
Jan 22, 8:24 PM CSTRiver Flood WatchDVN7 days
Jan 23, 10:08 AM CSTRiver Flood WarningDVN24 hr
Feb 6, 9:10 PM CSTDense Fog AdvisoryDVN15 hr
Feb 23, 10:43 AM CSTRiver Flood WatchDVN25 hr
Feb 23, 9:48 PM CSTMesoscale DiscussionSPC2 hr
Feb 28, 2:57 PM CSTTornado WatchSPC7 hr
Feb 28, 3:26 PM CSTSevere Thunderstorm WarningDVN36 min
Feb 28, 5:19 PM CSTSevere Thunderstorm WarningDVN26 min
Mar 6, 1:08 PM CSTMesoscale DiscussionSPC3 hr
Mar 6, 1:54 PM CSTTornado WatchSPC8 hr
Mar 6, 3:35 PM CSTMesoscale DiscussionSPC115 min
Mar 6, 6:11 PM CSTMesoscale DiscussionSPC2 hr
Mar 6, 7:42 PM CSTMesoscale DiscussionSPC63 min
Mar 6, 8:02 PM CSTSevere Thunderstorm WarningDVN58 min
Mar 6, 8:46 PM CSTTornado WarningDVN22 min
Mar 7, 3:32 AM CSTRed Flag WarningDVN14 hr
Mar 8, 3:18 AM CSTWind AdvisoryDVN14 hr
Mar 8, 10:21 AM CSTRed Flag WarningDVN8 hr
Mar 11, 3:36 PM CSTWinter Storm WatchDVN12 hr
Mar 12, 4:27 AM CDTWinter Weather AdvisoryDVN33 hr
Mar 19, 11:50 PM CDTMesoscale DiscussionSPC85 min
Mar 26, 5:22 AM CDTDense Fog AdvisoryDVN7 hr
Mar 29, 10:55 AM CDTRiver Flood WatchDVN7 days
Apr 3, 9:23 AM CDTRiver Flood WatchDVN7 days
Apr 5, 9:55 AM CDTRiver Flood WarningDVN5 days
Apr 10, 1:07 AM CDTSpecial Weather StatementDVN23 min
Apr 10, 1:31 AM CDTSpecial Weather StatementDVN29 min
Apr 10, 1:53 AM CDTMesoscale DiscussionSPC2 hr
Apr 15, 5:06 PM CDTMesoscale DiscussionSPC84 min
Apr 15, 6:58 PM CDTSevere Thunderstorm WarningDVN24 min
Apr 15, 7:22 PM CDTMesoscale DiscussionSPC53 min
Apr 15, 8:49 PM CDTRiver Flood WatchDVN6 days
Apr 16, 10:01 AM CDTRiver Flood WarningDVN7 days
Apr 19, 8:57 PM CDTSevere Thunderstorm WatchSPC4 hr
Apr 19, 10:06 PM CDTMesoscale DiscussionSPC54 min
Apr 30, 7:25 PM CDTSpecial Weather StatementDVN65 min
Apr 30, 8:14 PM CDTSpecial Weather StatementDVN61 min
May 2, 3:16 AM CDTFrost AdvisoryDVN28 hr
May 3, 9:57 AM CDTRiver Flood WatchDVN57 hr
May 17, 1:23 AM CDTSpecial Weather StatementDVN37 min
May 17, 3:24 PM CDTMesoscale DiscussionSPC66 min
May 17, 3:44 PM CDTTornado WatchSPC9 hr
May 17, 4:23 PM CDTSevere Thunderstorm WarningDVN44 min
May 17, 5:03 PM CDTSevere Thunderstorm WarningDVN57 min
May 17, 5:50 PM CDTSevere Thunderstorm WarningDVN55 min
May 19, 11:39 AM CDTRiver Flood WatchDVN4 days
May 27, 1:53 AM CDTDense Fog AdvisoryDVN8 hr
Jun 13, 10:42 AM CDTHeat AdvisoryDVN9 hr
Jun 14, 5:46 AM CDTSpecial Weather StatementDVN89 min
Jun 14, 12:06 PM CDTMesoscale DiscussionSPC2 hr
Jun 15, 6:39 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 15, 9:33 PM CDTMesoscale DiscussionSPC57 min
Jun 15, 11:55 PM CDTSevere Thunderstorm WarningDVN27 min
Jun 16, 10:25 PM CDTSevere Thunderstorm WatchSPC5 hr
Jun 17, 1:35 AM CDTMesoscale DiscussionSPC115 min
Jun 19, 12:44 PM CDTMesoscale DiscussionSPC3 hr
Jun 28, 2:14 PM CDTMesoscale DiscussionSPC2 hr
Jun 28, 2:53 PM CDTTornado WatchSPC9 hr
Jun 28, 5:29 PM CDTMesoscale DiscussionSPC91 min
Jul 7, 1:38 AM CDTSpecial Weather StatementDVN67 min
Jul 10, 1:49 AM CDTMesoscale DiscussionSPC116 min
Jul 10, 2:20 PM CDTHeat AdvisoryDVN5 hr
Jul 11, 5:27 AM CDTSpecial Weather StatementDVN48 min
Jul 11, 5:40 AM CDTSevere Thunderstorm WarningDVN50 min
Jul 11, 5:51 PM CDTTornado Warning Tornado observedDVN39 min
Jul 12, 4:05 AM CDTHeat AdvisoryDVN16 hr
Jul 12, 6:09 PM CDTSpecial Weather StatementDVN66 min
Jul 17, 3:37 PM CDTExcessive Heat WatchDVN36 hr
Jul 18, 3:08 PM CDTExcessive Heat WarningDVN4 days
Jul 18, 4:31 PM CDTSpecial Weather StatementDVN29 min
Jul 18, 5:00 PM CDTSpecial Weather StatementDVN30 min
Jul 19, 3:50 AM CDTHeat AdvisoryDVN4 days
Jul 20, 1:16 AM CDTMesoscale DiscussionSPC119 min
Jul 20, 3:55 PM CDTFlash Flood WatchDVN41 hr
Jul 20, 11:39 PM CDTSevere Thunderstorm WarningDVN27 min
Jul 21, 1:32 PM CDTMesoscale DiscussionSPC2 hr
Jul 21, 3:51 PM CDTSevere Thunderstorm WarningDVN54 min
Jul 21, 4:39 PM CDTSevere Thunderstorm WarningDVN66 min
Jul 21, 4:52 PM CDTSevere Thunderstorm WatchSPC9 hr
Jul 21, 6:28 PM CDTMesoscale DiscussionSPC92 min
Jul 21, 8:35 PM CDTMesoscale DiscussionSPC115 min
Jul 21, 11:23 PM CDTMesoscale DiscussionSPC67 min
Jul 26, 3:23 AM CDTFlash Flood WatchDVN20 hr
Aug 10, 3:28 PM CDTSevere Thunderstorm WarningDVN62 min
Aug 10, 4:06 PM CDTSpecial Weather StatementDVN54 min
Aug 16, 2:35 PM CDTMesoscale DiscussionSPC2 hr
Aug 21, 6:44 PM CDTSpecial Weather StatementDVN61 min
Aug 28, 2:18 AM CDTDense Fog AdvisoryDVN9 hr
Sep 19, 12:50 AM CDTDense Fog AdvisoryDVN9 hr
Sep 22, 10:16 AM CDTHeat AdvisoryDVN9 hr
Oct 14, 3:30 AM CDTFlash Flood WatchDVN19 hr
Oct 27, 3:39 AM CDTFreeze WarningDVN28 hr
Oct 27, 3:39 AM CDTFreeze WarningDVN53 hr
Nov 2, 1:31 AM CDTDense Fog AdvisoryDVN9 hr
Nov 4, 11:19 PM CDTDense Fog AdvisoryDVN8 hr
Nov 12, 9:39 PM CSTDense Fog AdvisoryDVN14 hr
Dec 4, 9:58 PM CSTWind AdvisoryDVN20 hr
Dec 13, 3:26 AM CSTWind AdvisoryDVN17 hr
Dec 23, 3:20 AM CSTWinter Weather AdvisoryDVN39 hr
Dec 26, 1:25 PM CSTWind Chill AdvisoryDVN22 hr
Dec 28, 3:15 PM CSTWinter Weather AdvisoryDVN29 hr
Dec 29, 3:24 AM CSTWinter Storm WarningDVN17 hr
Dec 29, 3:11 PM CSTWind Chill AdvisoryDVN54 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 archive20162018

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.