Alert archive / Iowa / Floyd County

Weather alerts in Floyd County, Iowa, 2023

94 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Floyd County and its neighbors

Each county as a circle sized by its count in 2023. Tap one for its archive.

Alerts
94
Warnings
14
Watches
16
Advisories
35
Busiest month
January14 alerts
Busiest day
March 31, 20238 alerts

Over time

By month

Warning verification

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

Floyd County, 2023

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings4250%1100%15 min
Flash flood warnings00

Each office's whole area, 2023

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS La Crosse, WI: tornado warnings10100%10%
NWS La Crosse, WI: severe thunderstorm warnings764936%16078%23 min
NWS La Crosse, WI: flash flood warnings2150%1100%152 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 1, 5:51 AM CSTDense Fog AdvisoryARX3 hr
Jan 1, 2:50 PM CSTIce Storm WarningARX23 hr
Jan 2, 3:37 AM CSTWinter Weather AdvisoryARX38 hr
Jan 3, 6:22 PM CSTDense Fog AdvisoryARX8 hr
Jan 8, 4:44 AM CSTDense Fog AdvisoryARX7 hr
Jan 16, 6:29 PM CSTDense Fog AdvisoryARX6 hr
Jan 17, 2:35 AM CSTWinter Storm WatchARX25 hr
Jan 18, 3:18 AM CSTWinter Storm WarningARX34 hr
Jan 22, 7:41 PM CSTDense Fog AdvisoryARX11 hr
Jan 24, 8:09 AM CSTDense Fog AdvisoryARX4 hr
Jan 27, 2:58 AM CSTWinter Weather AdvisoryARX48 hr
Jan 28, 1:47 PM CSTWind Chill AdvisoryARX21 hr
Jan 29, 2:18 PM CSTWind Chill AdvisoryARX20 hr
Jan 30, 1:52 PM CSTWind Chill AdvisoryARX20 hr
Feb 2, 2:53 AM CSTWind Chill AdvisoryARX32 hr
Feb 7, 2:25 PM CSTWinter Storm WatchARX24 hr
Feb 19, 2:14 PM CSTWinter Storm WatchARX48 hr
Feb 21, 2:57 AM CSTWinter Storm WarningARX57 hr
Feb 27, 3:17 PM CSTRiver Flood WarningDMX16 hr
Mar 6, 8:12 AM CSTDense Fog AdvisoryARX3 hr
Mar 7, 2:47 PM CSTWinter Storm WatchARX24 hr
Mar 8, 2:22 PM CSTWinter Storm WarningARX40 hr
Mar 8, 2:22 PM CSTWinter Weather AdvisoryARX40 hr
Mar 9, 8:42 AM CSTMesoscale DiscussionSPC4 hr
Mar 16, 3:39 AM CDTWind AdvisoryARX24 hr
Mar 31, 3:33 AM CDTWinter Weather AdvisoryARX27 hr
Mar 31, 11:24 AM CDTMesoscale DiscussionSPC96 min
Mar 31, 11:46 AM CDTTornado Watch PDSSPC8 hr
Mar 31, 3:43 PM CDTSevere Thunderstorm WarningARX47 min
Mar 31, 4:37 PM CDTSpecial Weather StatementARX83 min
Mar 31, 4:39 PM CDTSevere Thunderstorm WarningARX66 min
Mar 31, 5:18 PM CDTMesoscale DiscussionSPC117 min
Mar 31, 5:30 PM CDTMesoscale DiscussionSPC2 hr
Apr 4, 2:54 PM CDTMesoscale DiscussionSPC3 hr
Apr 4, 5:34 PM CDTMesoscale DiscussionSPC86 min
Apr 4, 6:34 PM CDTSevere Thunderstorm WatchSPC6 hr
Apr 4, 6:44 PM CDTSevere Thunderstorm WarningARX61 min
Apr 4, 10:59 PM CDTMesoscale DiscussionSPC91 min
Apr 12, 2:43 AM CDTRed Flag WarningARX17 hr
Apr 12, 2:32 PM CDTFire Weather WatchARX11 hr
Apr 13, 1:46 AM CDTRed Flag WarningARX18 hr
Apr 15, 2:46 PM CDTWind AdvisoryARX40 hr
Apr 19, 7:27 AM CDTSpecial Weather StatementARX48 min
Apr 19, 10:58 PM CDTSevere Thunderstorm WatchSPC7 hr
Apr 30, 3:03 AM CDTWind AdvisoryARX17 hr
May 1, 10:37 AM CDTWind AdvisoryARX8 hr
May 1, 2:42 PM CDTFire Weather WatchARX12 hr
May 2, 2:26 AM CDTRed Flag WarningARX18 hr
May 7, 2:52 AM CDTDense Fog AdvisoryARX8 hr
May 18, 2:18 PM CDTMesoscale DiscussionSPC117 min
Jun 24, 1:27 PM CDTMesoscale DiscussionSPC2 hr
Jun 24, 1:35 PM CDTTornado WatchSPC5 hr
Jun 24, 3:39 PM CDTMesoscale DiscussionSPC2 hr
Jun 24, 9:37 PM CDTMesoscale DiscussionSPC83 min
Jun 24, 10:14 PM CDTSevere Thunderstorm WatchSPC5 hr
Jun 24, 11:56 PM CDTMesoscale DiscussionSPC94 min
Jun 25, 12:55 AM CDTSpecial Weather StatementARX65 min
Jul 10, 6:18 PM CDTMesoscale DiscussionSPC57 min
Jul 10, 6:51 PM CDTSevere Thunderstorm WatchSPC4 hr
Jul 10, 9:35 PM CDTMesoscale DiscussionSPC55 min
Jul 13, 4:43 AM CDTDense Fog AdvisoryARX3 hr
Jul 13, 1:28 PM CDTMesoscale DiscussionSPC2 hr
Jul 26, 2:04 PM CDTHeat AdvisoryARX30 hr
Jul 28, 3:28 AM CDTHeat AdvisoryARX16 hr
Jul 28, 3:55 PM CDTMesoscale DiscussionSPC95 min
Jul 28, 4:57 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 28, 8:15 PM CDTSevere Thunderstorm WarningARX27 min
Aug 2, 9:32 PM CDTDense Fog AdvisoryARX11 hr
Aug 4, 2:09 PM CDTSpecial Weather StatementARX51 min
Aug 11, 1:10 AM CDTSpecial Weather StatementARX65 min
Aug 11, 1:38 AM CDTSpecial Weather StatementARX67 min
Aug 11, 2:28 PM CDTSevere Thunderstorm WatchSPC8 hr
Aug 11, 6:42 PM CDTMesoscale DiscussionSPC63 min
Aug 11, 8:37 PM CDTSpecial Weather StatementARX38 min
Aug 11, 9:08 PM CDTMesoscale DiscussionSPC97 min
Aug 18, 2:12 PM CDTHeat AdvisoryARX31 hr
Aug 20, 2:48 AM CDTExcessive Heat WatchARX3 days
Aug 20, 2:12 PM CDTExcessive Heat WarningARX4 days
Sep 15, 9:36 PM CDTDense Fog AdvisoryARX11 hr
Sep 21, 5:24 AM CDTDense Fog AdvisoryARX4 hr
Sep 23, 1:09 PM CDTMesoscale DiscussionSPC96 min
Sep 23, 1:34 PM CDTSevere Thunderstorm WatchSPC8 hr
Sep 23, 3:39 PM CDTMesoscale DiscussionSPC96 min
Sep 23, 6:23 PM CDTMesoscale DiscussionSPC2 hr
Sep 26, 2:55 AM CDTDense Fog AdvisoryARX6 hr
Oct 8, 1:42 PM CDTFrost AdvisoryARX19 hr
Oct 9, 2:19 PM CDTFrost AdvisoryARX19 hr
Oct 10, 1:47 PM CDTFrost AdvisoryARX19 hr
Oct 23, 9:27 PM CDTMesoscale DiscussionSPC3 hr
Oct 27, 2:49 AM CDTFreeze WarningARX29 hr
Nov 15, 2:10 PM CSTWind AdvisoryARX29 hr
Dec 17, 1:47 PM CSTWind AdvisoryARX16 hr
Dec 22, 3:00 PM CSTDense Fog AdvisoryARX22 hr
Dec 30, 5:27 PM CSTWinter Weather AdvisoryARX16 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 archive20222024

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.