Alert archive / Iowa / Henry County

Weather alerts in Henry County, Iowa, 2013

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

Henry County and its neighbors

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

Alerts
123
Warnings
31
Watches
24
Advisories
23
Busiest month
May37 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 1 tornado warnings covering Henry County in 2013 had a tornado report inside them.

Henry County, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings161225%3100%18 min
Flash flood warnings4250%0

Each office's whole area, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Quad Cities, IA: tornado warnings23674%1765%10 min
NWS Quad Cities, IA: severe thunderstorm warnings1319131%31679%20 min
NWS Quad Cities, IA: flash flood warnings332039%7189%128 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, 3:17 PM CSTDense Fog AdvisoryDVN27 hr
Jan 26, 3:41 AM CSTWinter Storm WatchDVN24 hr
Jan 26, 9:05 PM CSTFreezing Rain AdvisoryDVN24 hr
Jan 27, 6:40 AM CSTMesoscale DiscussionSPC5 hr
Jan 28, 7:52 AM CSTDense Fog AdvisoryDVN22 hr
Jan 29, 3:39 AM CSTWinter Storm WatchDVN12 hr
Jan 29, 3:18 PM CSTWinter Weather AdvisoryDVN27 hr
Jan 31, 3:32 AM CSTWind Chill AdvisoryDVN32 hr
Feb 10, 7:28 PM CSTWind AdvisoryDVN20 hr
Feb 19, 2:20 PM CSTWinter Storm WatchDVN25 hr
Feb 20, 3:17 PM CSTWinter Storm WarningDVN48 hr
Feb 21, 3:37 PM CSTMesoscale DiscussionSPC4 hr
Feb 24, 2:56 AM CSTWinter Storm WatchDVN37 hr
Feb 25, 3:22 AM CSTWinter Storm WarningDVN42 hr
Feb 26, 2:22 AM CSTMesoscale DiscussionSPC5 hr
Mar 2, 3:39 PM CSTWinter Storm WatchDVN37 hr
Mar 4, 4:13 AM CSTWinter Weather AdvisoryDVN35 hr
Mar 10, 6:37 AM CDTDense Fog AdvisoryDVN21 hr
Mar 10, 11:16 AM CDTRiver Flood WarningDVN5 days
Mar 18, 6:34 AM CDTWinter Weather AdvisoryDVN6 hr
Mar 22, 3:46 AM CDTWinter Storm WatchDVN35 hr
Mar 23, 2:22 PM CDTWinter Weather AdvisoryDVN34 hr
Apr 9, 2:54 PM CDTFlash Flood WatchDVN32 hr
Apr 14, 3:38 AM CDTWind AdvisoryDVN15 hr
Apr 16, 3:32 PM CDTFlash Flood WatchDVN45 hr
Apr 17, 8:49 AM CDTMesoscale DiscussionSPC56 min
Apr 17, 9:14 AM CDTSevere Thunderstorm WatchSPC10 hr
Apr 17, 11:17 AM CDTRiver Flood WarningDVN7 days
Apr 17, 12:48 PM CDTFlash Flood WarningDVN6 hr
Apr 17, 1:33 PM CDTMesoscale DiscussionSPC57 min
Apr 17, 4:19 PM CDTMesoscale DiscussionSPC26 min
Apr 17, 9:34 PM CDTSevere Thunderstorm WarningDVN26 min
Apr 18, 3:46 AM CDTAreal Flood WarningDVN18 hr
May 4, 9:02 AM CDTRiver Flood WarningDVN4 days
May 19, 11:23 AM CDTSpecial Weather StatementDVN52 min
May 19, 11:30 AM CDTMesoscale DiscussionSPC90 min
May 19, 2:59 PM CDTTornado WatchSPC8 hr
May 19, 4:52 PM CDTSpecial Weather StatementDVN68 min
May 19, 7:13 PM CDTMesoscale DiscussionSPC62 min
May 19, 8:07 PM CDTSevere Thunderstorm WarningDVN38 min
May 19, 8:10 PM CDTTornado WatchSPC6 hr
May 19, 8:37 PM CDTSevere Thunderstorm WarningDVN38 min
May 19, 10:43 PM CDTSevere Thunderstorm WarningDVN47 min
May 19, 10:55 PM CDTSevere Thunderstorm WarningDVN50 min
May 19, 10:58 PM CDTMesoscale DiscussionSPC62 min
May 20, 6:26 PM CDTSevere Thunderstorm WarningDVN49 min
May 20, 6:35 PM CDTSevere Thunderstorm WatchSPC5 hr
May 20, 9:33 PM CDTMesoscale DiscussionSPC57 min
May 22, 7:42 PM CDTSpecial Weather StatementDVN48 min
May 26, 3:06 AM CDTFlash Flood WatchDVN56 hr
May 26, 8:41 AM CDTFlash Flood WarningDVN6 hr
May 26, 2:50 PM CDTSpecial Weather StatementDVN55 min
May 26, 7:07 PM CDTFlash Flood WarningDVN9 hr
May 26, 10:12 PM CDTRiver Flood WarningDVN12 days
May 28, 5:58 AM CDTSpecial Weather StatementDVN47 min
May 28, 6:45 AM CDTSpecial Weather StatementDVN60 min
May 28, 10:53 AM CDTFlash Flood WatchDVN19 hr
May 28, 1:37 PM CDTMesoscale DiscussionSPC113 min
May 28, 2:23 PM CDTTornado WatchSPC8 hr
May 28, 5:22 PM CDTSevere Thunderstorm WarningDVN38 min
May 28, 5:52 PM CDTMesoscale DiscussionSPC83 min
May 28, 6:57 PM CDTFlash Flood WarningDVN9 hr
May 28, 7:39 PM CDTSevere Thunderstorm WarningDVN66 min
May 29, 3:18 PM CDTFlash Flood WatchDVN54 hr
May 30, 11:29 AM CDTMesoscale DiscussionSPC61 min
May 30, 12:32 PM CDTTornado WatchSPC7 hr
May 30, 2:16 PM CDTMesoscale DiscussionSPC59 min
May 30, 2:41 PM CDTSevere Thunderstorm WarningDVN49 min
May 30, 3:28 PM CDTSevere Thunderstorm WarningDVN47 min
May 30, 3:52 PM CDTMesoscale DiscussionSPC113 min
Jun 6, 2:07 PM CDTSpecial Weather StatementDVN83 min
Jun 12, 10:52 AM CDTSpecial Weather StatementDVN2 hr
Jun 12, 12:56 PM CDTSpecial Weather StatementDVN109 min
Jun 15, 3:56 PM CDTMesoscale DiscussionSPC2 hr
Jun 15, 6:46 PM CDTSevere Thunderstorm WarningDVN44 min
Jun 23, 3:57 AM CDTFlash Flood WatchDVN3 days
Jun 23, 11:47 AM CDTSpecial Weather StatementDVN58 min
Jun 23, 10:02 PM CDTSevere Thunderstorm WarningDVN43 min
Jun 24, 10:35 AM CDTMesoscale DiscussionSPC55 min
Jun 24, 12:14 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 24, 2:10 PM CDTSevere Thunderstorm WarningDVN50 min
Jun 24, 2:11 PM CDTMesoscale DiscussionSPC2 hr
Jun 24, 2:42 PM CDTSevere Thunderstorm WarningDVN48 min
Jun 24, 2:42 PM CDTTornado WarningDVN33 min
Jun 25, 9:44 PM CDTMesoscale DiscussionSPC91 min
Jun 25, 9:49 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 26, 3:32 AM CDTMesoscale DiscussionSPC88 min
Jun 29, 6:08 PM CDTSpecial Weather StatementDVN52 min
Jul 17, 3:02 AM CDTHeat AdvisoryDVN64 hr
Jul 21, 4:33 PM CDTSpecial Weather StatementDVN57 min
Jul 22, 3:33 AM CDTDense Fog AdvisoryDVN4 hr
Jul 22, 6:40 PM CDTSevere Thunderstorm WatchSPC5 hr
Jul 25, 7:04 PM CDTMesoscale DiscussionSPC116 min
Aug 2, 2:24 PM CDTMesoscale DiscussionSPC66 min
Aug 6, 5:25 AM CDTDense Fog AdvisoryDVN4 hr
Aug 6, 6:51 PM CDTSevere Thunderstorm WatchSPC3 hr
Aug 6, 7:48 PM CDTSevere Thunderstorm WarningDVN42 min
Aug 6, 9:37 PM CDTMesoscale DiscussionSPC113 min
Aug 7, 2:41 AM CDTMesoscale DiscussionSPC2 hr
Aug 7, 5:32 AM CDTMesoscale DiscussionSPC103 min
Aug 25, 4:09 AM CDTHeat AdvisoryDVN6 days
Sep 19, 4:29 PM CDTMesoscale DiscussionSPC91 min
Sep 19, 4:40 PM CDTSevere Thunderstorm WatchSPC6 hr
Sep 19, 8:03 PM CDTSpecial Weather StatementDVN57 min
Oct 3, 11:42 PM CDTMesoscale DiscussionSPC93 min
Oct 4, 2:06 AM CDTMesoscale DiscussionSPC84 min
Oct 4, 9:03 AM CDTMesoscale DiscussionSPC87 min
Oct 21, 3:28 AM CDTFrost AdvisoryDVN27 hr
Oct 22, 3:03 PM CDTFreeze WarningDVN13 hr
Oct 24, 4:19 AM CDTFreeze WarningDVN29 hr
Oct 30, 5:20 AM CDTDense Fog AdvisoryDVN8 hr
Oct 30, 1:26 PM CDTMesoscale DiscussionSPC94 min
Nov 16, 3:43 PM CSTWind AdvisoryDVN26 hr
Nov 17, 7:47 AM CSTMesoscale DiscussionSPC88 min
Nov 17, 10:23 AM CSTSevere Thunderstorm WarningDVN52 min
Dec 3, 3:23 AM CSTDense Fog AdvisoryDVN38 hr
Dec 13, 4:05 AM CSTWinter Weather AdvisoryDVN26 hr
Dec 19, 3:50 AM CSTFreezing Rain AdvisoryDVN35 hr
Dec 19, 2:56 PM CSTWinter Storm WatchDVN24 hr
Dec 20, 3:02 PM CSTWinter Storm WarningDVN44 hr
Dec 21, 10:41 PM CSTMesoscale DiscussionSPC5 hr
Dec 23, 4:06 AM CSTWind Chill AdvisoryDVN30 hr
Dec 28, 3:14 PM CSTWind Chill AdvisoryDVN42 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.