Alert archive / Iowa / Iowa County

Weather alerts in Iowa County, Iowa, 2018

180 weather alerts in 2018, 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 2018. Tap one for its archive.

Alerts
180
Warnings
42
Watches
23
Advisories
44
Busiest month
October29 alerts
Busiest day
October 9, 201810 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 9 tornado warnings covering Iowa County in 2018 had a tornado report inside them.

Iowa County, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings9189%0
Severe thunderstorm warnings10640%771%33 min
Flash flood warnings4250%2100%296 min

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Quad Cities, IA: tornado warnings471470%3259%8 min
NWS Quad Cities, IA: severe thunderstorm warnings1369232%24975%22 min
NWS Quad Cities, IA: flash flood warnings291934%3979%73 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, 2:50 PM CSTWind Chill AdvisoryDVN43 hr
Jan 2, 9:18 PM CSTSpecial Weather StatementDVN117 min
Jan 6, 2:50 AM CSTWind Chill AdvisoryDVN6 hr
Jan 11, 3:07 AM CSTWinter Weather AdvisoryDVN17 hr
Jan 11, 9:36 AM CSTMesoscale DiscussionSPC4 hr
Jan 14, 2:45 PM CSTWind Chill AdvisoryDVN44 hr
Jan 14, 2:45 PM CSTWinter Weather AdvisoryDVN21 hr
Jan 14, 8:19 PM CSTSpecial Weather StatementDVN86 min
Jan 21, 4:01 PM CSTDense Fog AdvisoryDVN14 hr
Jan 22, 8:14 PM CSTRiver Flood WarningDVN55 hr
Feb 4, 1:53 PM CSTWinter Weather AdvisoryDVN32 hr
Feb 5, 11:36 AM CSTMesoscale DiscussionSPC6 hr
Feb 7, 1:54 PM CSTWinter Storm WatchDVN13 hr
Feb 8, 2:59 AM CSTWinter Storm WarningDVN30 hr
Feb 8, 2:59 AM CSTWinter Weather AdvisoryDVN39 hr
Feb 9, 3:09 PM CSTWinter Weather AdvisoryDVN18 hr
Feb 18, 2:28 AM CSTDense Fog AdvisoryDVN8 hr
Feb 19, 1:39 PM CSTDense Fog AdvisoryDVN13 hr
Feb 20, 3:19 PM CSTRiver Flood WarningDVN4 days
Feb 22, 3:23 AM CSTWinter Weather AdvisoryDVN9 hr
Feb 23, 3:13 PM CSTWinter Weather AdvisoryDVN20 hr
Mar 5, 1:48 AM CSTSpecial Weather StatementDVN87 min
Mar 5, 3:16 AM CSTSpecial Weather StatementDVN89 min
Mar 5, 4:16 AM CSTSpecial Weather StatementDVN89 min
Mar 6, 4:40 AM CSTSpecial Weather StatementDVN80 min
Mar 6, 5:51 AM CSTSpecial Weather StatementDVN84 min
Mar 6, 6:51 AM CSTSpecial Weather StatementDVN114 min
Mar 16, 3:10 AM CDTWinter Weather AdvisoryDVN32 hr
Mar 16, 7:35 PM CDTSpecial Weather StatementDVN55 min
Mar 16, 8:29 PM CDTSpecial Weather StatementDVN91 min
Mar 18, 2:25 AM CDTDense Fog AdvisoryDVN9 hr
Mar 23, 3:30 AM CDTWinter Storm WarningDVN40 hr
Mar 23, 3:30 AM CDTWinter Weather AdvisoryDVN40 hr
Mar 31, 6:13 AM CDTWind AdvisoryDVN10 hr
Apr 7, 3:08 PM CDTWinter Weather AdvisoryDVN43 hr
Apr 9, 10:03 AM CDTWinter Weather AdvisoryDVN94 min
Apr 13, 3:33 PM CDTRiver Flood WatchDVN42 hr
Apr 13, 5:51 PM CDTWind AdvisoryDVN25 hr
Apr 14, 3:51 AM CDTWinter Weather AdvisoryDVN39 hr
Apr 17, 4:07 AM CDTWinter Weather AdvisoryDVN45 hr
Apr 27, 2:50 PM CDTRed Flag WarningDVN5 hr
May 1, 7:55 PM CDTMesoscale DiscussionSPC95 min
May 1, 9:38 PM CDTMesoscale DiscussionSPC67 min
May 2, 3:56 PM CDTSevere Thunderstorm WatchSPC9 hr
May 2, 7:18 PM CDTSevere Thunderstorm WarningDVN57 min
May 2, 7:21 PM CDTMesoscale DiscussionSPC84 min
May 3, 9:27 PM CDTRiver Flood WatchDVN14 hr
May 12, 1:04 AM CDTMesoscale DiscussionSPC116 min
May 12, 2:59 AM CDTSpecial Weather StatementDVN61 min
May 14, 4:08 AM CDTSpecial Weather StatementDVN37 min
May 14, 4:41 AM CDTSpecial Weather StatementDVN34 min
May 22, 3:34 AM CDTDense Fog AdvisoryDVN5 hr
May 26, 12:30 AM CDTSpecial Weather StatementDVN45 min
May 26, 12:35 AM CDTSevere Thunderstorm WarningDVN40 min
May 26, 1:07 AM CDTSevere Thunderstorm WarningDVN38 min
Jun 6, 6:29 PM CDTSpecial Weather StatementDVN46 min
Jun 9, 6:30 PM CDTMesoscale DiscussionSPC2 hr
Jun 9, 7:43 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 9, 8:58 PM CDTTornado WarningDVN32 min
Jun 9, 9:44 PM CDTSevere Thunderstorm WarningDVN46 min
Jun 9, 10:17 PM CDTMesoscale DiscussionSPC118 min
Jun 9, 10:28 PM CDTTornado WarningDVN19 min
Jun 9, 10:56 PM CDTSevere Thunderstorm WarningDVN49 min
Jun 9, 11:44 PM CDTMesoscale DiscussionSPC2 hr
Jun 12, 12:28 AM CDTSpecial Weather StatementDVN62 min
Jun 12, 6:31 PM CDTMesoscale DiscussionSPC2 hr
Jun 15, 3:25 AM CDTHeat AdvisoryDVN4 days
Jun 19, 6:12 AM CDTSpecial Weather StatementDVN63 min
Jun 20, 6:36 AM CDTSpecial Weather StatementDVN24 min
Jun 20, 10:09 AM CDTRiver Flood WatchDVN34 hr
Jun 20, 1:01 PM CDTMesoscale DiscussionSPC2 hr
Jun 20, 2:14 PM CDTSpecial Weather StatementDVN61 min
Jun 20, 3:04 PM CDTTornado WatchSPC4 hr
Jun 20, 3:10 PM CDTSevere Thunderstorm WarningDVN65 min
Jun 20, 5:13 PM CDTMesoscale DiscussionSPC2 hr
Jun 21, 12:11 PM CDTSpecial Weather StatementDVN49 min
Jun 21, 1:22 PM CDTSpecial Weather StatementDVN53 min
Jun 21, 8:09 PM CDTRiver Flood WarningDVN24 hr
Jun 27, 3:11 PM CDTHeat AdvisoryDVN24 hr
Jun 28, 3:31 PM CDTExcessive Heat WarningDVN54 hr
Jun 30, 7:15 PM CDTMesoscale DiscussionSPC90 min
Jun 30, 10:06 PM CDTFlash Flood WatchDVN5 hr
Jul 1, 6:30 AM CDTRiver Flood WarningDVN4 days
Jul 3, 3:48 PM CDTHeat AdvisoryDVN28 hr
Jul 11, 3:11 PM CDTHeat AdvisoryDVN29 hr
Jul 13, 3:37 AM CDTHeat AdvisoryDVN15 hr
Jul 13, 3:21 PM CDTSpecial Weather StatementDVN54 min
Jul 13, 5:29 PM CDTSevere Thunderstorm WarningDVN29 min
Jul 15, 12:50 PM CDTSpecial Weather StatementDVN70 min
Jul 15, 2:00 PM CDTSpecial Weather StatementDVN90 min
Jul 19, 6:50 AM CDTSpecial Weather StatementDVN40 min
Jul 19, 3:11 PM CDTTornado WatchSPC6 hr
Jul 19, 5:18 PM CDTMesoscale DiscussionSPC57 min
Jul 25, 10:57 PM CDTSpecial Weather StatementDVN63 min
Aug 5, 5:44 PM CDTMesoscale DiscussionSPC2 hr
Aug 8, 4:07 AM CDTDense Fog AdvisoryDVN5 hr
Aug 15, 7:00 PM CDTSpecial Weather StatementDVN30 min
Aug 15, 7:33 PM CDTSpecial Weather StatementDVN27 min
Aug 15, 7:56 PM CDTSpecial Weather StatementDVN34 min
Aug 16, 3:00 AM CDTDense Fog AdvisoryDVN6 hr
Aug 24, 10:43 PM CDTSpecial Weather StatementDVN92 min
Aug 25, 4:03 AM CDTDense Fog AdvisoryDVN6 hr
Aug 28, 9:08 AM CDTFlash Flood WatchDVN20 hr
Aug 28, 4:45 PM CDTMesoscale DiscussionSPC60 min
Aug 28, 5:06 PM CDTSevere Thunderstorm WatchSPC6 hr
Aug 28, 5:14 PM CDTSevere Thunderstorm WarningDVN61 min
Aug 28, 5:40 PM CDTTornado WarningDVN35 min
Aug 28, 6:02 PM CDTTornado WarningDVN28 min
Aug 28, 6:07 PM CDTMesoscale DiscussionSPC53 min
Aug 31, 7:12 PM CDTSpecial Weather StatementDVN108 min
Aug 31, 11:32 PM CDTSpecial Weather StatementDVN58 min
Sep 1, 12:43 AM CDTSpecial Weather StatementDVN62 min
Sep 1, 3:29 AM CDTFlash Flood WarningDVN8 hr
Sep 1, 3:44 AM CDTFlash Flood WatchDVN24 hr
Sep 1, 10:01 AM CDTRiver Flood WarningDVN15 days
Sep 1, 11:27 AM CDTAreal Flood WarningDVN24 hr
Sep 1, 6:34 PM CDTMesoscale DiscussionSPC56 min
Sep 1, 8:20 PM CDTSevere Thunderstorm WatchSPC5 hr
Sep 1, 9:52 PM CDTSpecial Weather StatementDVN53 min
Sep 1, 10:27 PM CDTMesoscale DiscussionSPC63 min
Sep 1, 11:20 PM CDTFlash Flood WarningDVN4 hr
Sep 2, 9:26 AM CDTFlash Flood WatchDVN39 hr
Sep 2, 2:24 PM CDTMesoscale DiscussionSPC2 hr
Sep 3, 1:20 PM CDTMesoscale DiscussionSPC2 hr
Sep 3, 5:47 PM CDTMesoscale DiscussionSPC58 min
Sep 3, 6:09 PM CDTTornado WatchSPC2 hr
Sep 3, 7:41 PM CDTSpecial Weather StatementDVN64 min
Sep 4, 3:56 AM CDTFlash Flood WatchDVN39 hr
Sep 5, 1:01 PM CDTFlash Flood WarningDVN6 hr
Sep 18, 10:41 AM CDTSpecial Weather StatementDVN64 min
Sep 18, 9:34 PM CDTRiver Flood WatchDVN24 hr
Sep 19, 2:21 PM CDTSpecial Weather StatementDVN54 min
Sep 19, 9:48 PM CDTRiver Flood WarningDVN35 days
Sep 25, 12:48 PM CDTSevere Thunderstorm WarningDVN42 min
Sep 25, 1:07 PM CDTMesoscale DiscussionSPC113 min
Oct 3, 9:46 PM CDTSpecial Weather StatementDVN74 min
Oct 4, 1:18 PM CDTFlash Flood WatchDVN48 hr
Oct 5, 2:39 PM CDTMesoscale DiscussionSPC3 hr
Oct 5, 6:03 PM CDTSpecial Weather StatementDVN42 min
Oct 5, 7:40 PM CDTSpecial Weather StatementDVN50 min
Oct 5, 10:02 PM CDTFlash Flood WarningDVN6 hr
Oct 6, 3:54 AM CDTAreal Flood WarningDVN6 hr
Oct 6, 10:12 AM CDTAreal Flood WarningDVN12 hr
Oct 6, 9:59 PM CDTAreal Flood WarningDVN13 hr
Oct 7, 2:44 PM CDTFlash Flood WatchDVN70 hr
Oct 8, 3:34 AM CDTSpecial Weather StatementDVN56 min
Oct 8, 4:29 AM CDTSpecial Weather StatementDVN61 min
Oct 8, 10:29 PM CDTSevere Thunderstorm WarningDVN46 min
Oct 9, 12:59 PM CDTMesoscale DiscussionSPC3 hr
Oct 9, 1:46 PM CDTTornado WatchSPC7 hr
Oct 9, 3:06 PM CDTTornado WarningDVN39 min
Oct 9, 3:38 PM CDTTornado WarningDVN52 min
Oct 9, 3:53 PM CDTMesoscale DiscussionSPC2 hr
Oct 9, 4:03 PM CDTTornado WarningDVN27 min
Oct 9, 4:31 PM CDTTornado WarningDVN44 min
Oct 9, 5:14 PM CDTTornado WarningDVN46 min
Oct 9, 6:37 PM CDTMesoscale DiscussionSPC83 min
Oct 11, 3:40 AM CDTFrost AdvisoryDVN28 hr
Oct 12, 2:42 PM CDTFrost AdvisoryDVN18 hr
Oct 14, 3:21 PM CDTFreeze WarningDVN18 hr
Oct 15, 3:14 AM CDTFreeze WarningDVN30 hr
Oct 19, 7:36 PM CDTWind AdvisoryDVN20 hr
Oct 27, 2:31 PM CDTWind AdvisoryDVN26 hr
Oct 30, 12:58 PM CDTSpecial Weather StatementDVN32 min
Nov 4, 10:48 AM CSTRiver Flood WatchDVN6 days
Nov 4, 7:21 PM CSTRiver Flood WarningDVN7 days
Nov 16, 2:15 PM CSTWinter Weather AdvisoryDVN18 hr
Nov 23, 3:29 AM CSTWinter Storm WatchDVN24 hr
Nov 24, 3:52 AM CSTWinter Storm WarningDVN44 hr
Nov 25, 11:54 AM CSTMesoscale DiscussionSPC6 hr
Nov 30, 3:37 AM CSTDense Fog AdvisoryDVN6 hr
Dec 1, 7:28 AM CSTWind AdvisoryDVN7 hr
Dec 1, 12:36 PM CSTDense Fog AdvisoryDVN20 hr
Dec 4, 7:19 AM CSTWinter Weather AdvisoryDVN3 hr
Dec 11, 12:08 PM CSTWinter Weather AdvisoryDVN21 hr
Dec 26, 10:19 AM CSTRiver Flood WatchDVN58 hr
Dec 28, 2:50 AM CSTWinter Weather AdvisoryDVN9 hr
Dec 28, 2:37 PM CSTWinter Weather AdvisoryDVN7 hr
Dec 28, 7:58 PM CSTRiver Flood WarningDVN38 hr
Dec 30, 3:03 PM CSTWinter Weather AdvisoryDVN21 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 archive20172019

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.