Alert archive / Iowa / Wapello County

Weather alerts in Wapello County, Iowa, 2018

107 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Wapello County and its neighbors

Each county as a circle sized by its count in 2018. Tap one for its archive.

Alerts
107
Warnings
23
Watches
19
Advisories
31
Busiest month
June22 alerts
Busiest day
July 19, 20187 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 4 tornado warnings covering Wapello County in 2018 had a tornado report inside them; 1 of 3 tornado reports fell inside a warning, on average 20 minutes after it went out.

Wapello County, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings4175%333%20 min
Severe thunderstorm warnings12650%1663%27 min
Flash flood warnings10100%0

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Des Moines, IA: tornado warnings722368%6955%15 min
NWS Des Moines, IA: severe thunderstorm warnings30814354%42774%22 min
NWS Des Moines, IA: flash flood warnings392049%7074%86 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 3, 3:46 AM CSTWind Chill AdvisoryDMX30 hr
Jan 6, 3:45 AM CSTWinter Weather AdvisoryDMX38 hr
Jan 10, 2:08 PM CSTWinter Weather AdvisoryDMX28 hr
Jan 11, 9:36 AM CSTMesoscale DiscussionSPC4 hr
Jan 14, 3:47 AM CSTWind Chill AdvisoryDMX56 hr
Jan 26, 10:53 AM CSTWind AdvisoryDMX5 hr
Feb 4, 2:32 PM CSTWinter Weather AdvisoryDMX28 hr
Feb 5, 11:36 AM CSTMesoscale DiscussionSPC6 hr
Feb 9, 3:05 PM CSTWinter Weather AdvisoryDMX16 hr
Feb 10, 2:10 PM CSTWinter Weather AdvisoryDMX16 hr
Feb 21, 3:42 PM CSTWinter Weather AdvisoryDMX35 hr
Feb 23, 3:24 PM CSTWinter Weather AdvisoryDMX30 hr
Feb 28, 7:35 AM CSTDense Fog AdvisoryDMX3 hr
Mar 18, 2:12 AM CDTDense Fog AdvisoryDMX8 hr
Apr 3, 4:19 AM CDTWind AdvisoryDMX21 hr
Apr 7, 3:05 PM CDTWinter Weather AdvisoryDMX40 hr
Apr 13, 2:19 PM CDTTornado WatchSPC7 hr
Apr 13, 3:54 PM CDTWinter Weather AdvisoryDMX48 hr
Apr 27, 2:42 PM CDTRed Flag WarningDMX4 hr
May 1, 10:24 AM CDTMesoscale DiscussionSPC3 hr
May 2, 5:08 PM CDTMesoscale DiscussionSPC97 min
May 2, 5:27 PM CDTTornado WatchSPC8 hr
May 2, 8:00 PM CDTMesoscale DiscussionSPC90 min
May 2, 11:33 PM CDTSevere Thunderstorm WarningDMX29 min
May 3, 2:57 PM CDTSevere Thunderstorm WatchSPC6 hr
May 3, 7:43 PM CDTMesoscale DiscussionSPC62 min
May 22, 2:05 AM CDTDense Fog AdvisoryDMX7 hr
May 25, 10:40 PM CDTSpecial Weather StatementDMX65 min
May 28, 2:31 PM CDTMesoscale DiscussionSPC2 hr
Jun 6, 3:23 PM CDTSevere Thunderstorm WatchSPC9 hr
Jun 6, 7:15 PM CDTSevere Thunderstorm WarningDMX60 min
Jun 6, 7:55 PM CDTSpecial Weather StatementDMX35 min
Jun 6, 8:18 PM CDTSevere Thunderstorm WarningDMX29 min
Jun 8, 12:51 PM CDTMesoscale DiscussionSPC114 min
Jun 8, 2:02 PM CDTSevere Thunderstorm WarningDMX13 min
Jun 11, 11:04 PM CDTSpecial Weather StatementDMX56 min
Jun 14, 9:08 AM CDTSpecial Weather StatementDMX52 min
Jun 14, 10:50 AM CDTSevere Thunderstorm WarningDMX16 min
Jun 14, 3:00 PM CDTHeat AdvisoryDMX4 days
Jun 19, 12:06 PM CDTSpecial Weather StatementDMX54 min
Jun 20, 1:01 PM CDTMesoscale DiscussionSPC2 hr
Jun 20, 2:26 PM CDTSpecial Weather StatementDMX49 min
Jun 20, 3:04 PM CDTTornado WatchSPC4 hr
Jun 20, 5:13 PM CDTMesoscale DiscussionSPC2 hr
Jun 20, 5:34 PM CDTTornado Warning Tornado observedDMX41 min
Jun 20, 6:05 PM CDTSevere Thunderstorm WarningDMX41 min
Jun 27, 3:29 PM CDTHeat AdvisoryDMX54 hr
Jun 28, 8:12 AM CDTSevere Thunderstorm WatchSPC6 hr
Jun 28, 10:57 AM CDTMesoscale DiscussionSPC2 hr
Jun 28, 1:06 PM CDTSevere Thunderstorm WarningDMX54 min
Jun 30, 3:12 AM CDTHeat AdvisoryDMX16 hr
Jul 3, 2:39 PM CDTHeat AdvisoryDMX29 hr
Jul 11, 3:44 PM CDTHeat AdvisoryDMX28 hr
Jul 13, 3:31 AM CDTHeat AdvisoryDMX15 hr
Jul 13, 4:38 PM CDTSevere Thunderstorm WarningDMX52 min
Jul 15, 6:08 AM CDTDense Fog AdvisoryDMX3 hr
Jul 19, 2:32 PM CDTMesoscale DiscussionSPC118 min
Jul 19, 3:11 PM CDTTornado WatchSPC6 hr
Jul 19, 4:36 PM CDTTornado WarningDMX24 min
Jul 19, 4:52 PM CDTTornado WarningDMX38 min
Jul 19, 5:13 PM CDTTornado Warning Tornado observedDMX47 min
Jul 19, 5:18 PM CDTMesoscale DiscussionSPC57 min
Jul 19, 5:55 PM CDTSevere Thunderstorm WarningDMX20 min
Aug 2, 12:44 AM CDTSpecial Weather StatementDMX46 min
Aug 2, 1:08 AM CDTSpecial Weather StatementDMX37 min
Aug 5, 7:19 AM CDTSpecial Weather StatementDMX56 min
Aug 6, 6:38 PM CDTMesoscale DiscussionSPC2 hr
Aug 28, 4:45 PM CDTMesoscale DiscussionSPC60 min
Aug 28, 5:06 PM CDTSevere Thunderstorm WatchSPC6 hr
Aug 28, 5:17 PM CDTSevere Thunderstorm WarningDMX43 min
Aug 28, 5:47 PM CDTSevere Thunderstorm WarningDMX58 min
Aug 28, 6:43 PM CDTSevere Thunderstorm WarningDMX47 min
Aug 28, 11:37 PM CDTSpecial Weather StatementDMX53 min
Sep 1, 4:38 AM CDTFlash Flood WatchDMX24 hr
Sep 1, 6:34 PM CDTMesoscale DiscussionSPC56 min
Sep 1, 8:20 PM CDTSevere Thunderstorm WatchSPC5 hr
Sep 1, 9:59 PM CDTFlash Flood WarningDMX5 hr
Sep 1, 10:27 PM CDTMesoscale DiscussionSPC63 min
Sep 2, 9:45 AM CDTFlash Flood WatchDMX36 hr
Sep 2, 2:24 PM CDTMesoscale DiscussionSPC2 hr
Sep 5, 7:12 AM CDTFlash Flood WatchDMX20 hr
Sep 6, 3:01 PM CDTFlash Flood WatchDMX36 hr
Sep 25, 1:07 PM CDTMesoscale DiscussionSPC113 min
Oct 3, 12:07 PM CDTWind AdvisoryDMX13 hr
Oct 5, 2:39 PM CDTMesoscale DiscussionSPC3 hr
Oct 7, 3:52 PM CDTFlood WatchDMX60 hr
Oct 8, 11:38 AM CDTRiver Flood WarningDMX91 min
Oct 8, 11:39 AM CDTRiver Flood WatchDMX4 days
Oct 8, 5:33 PM CDTTornado WatchSPC4 hr
Oct 9, 12:38 PM CDTRiver Flood WatchDMX10 hr
Oct 9, 12:59 PM CDTMesoscale DiscussionSPC3 hr
Oct 9, 1:46 PM CDTTornado WatchSPC7 hr
Oct 9, 3:53 PM CDTMesoscale DiscussionSPC2 hr
Oct 9, 6:37 PM CDTMesoscale DiscussionSPC83 min
Oct 14, 3:45 AM CDTFreeze WarningDMX30 hr
Oct 15, 2:44 PM CDTFreeze WarningDMX18 hr
Oct 19, 7:30 PM CDTWind AdvisoryDMX20 hr
Nov 3, 4:46 AM CDTDense Fog AdvisoryDMX3 hr
Nov 17, 11:01 AM CSTWinter Weather AdvisoryDMX16 hr
Nov 23, 3:30 AM CSTWinter Storm WatchDMX24 hr
Nov 24, 3:40 AM CSTWinter Storm WarningDMX11 hr
Nov 24, 2:34 PM CSTBlizzard WarningDMX30 hr
Nov 25, 10:59 AM CSTMesoscale DiscussionSPC5 hr
Nov 30, 2:34 AM CSTDense Fog AdvisoryDMX7 hr
Dec 1, 6:56 AM CSTWind AdvisoryDMX7 hr
Dec 1, 12:55 PM CSTDense Fog AdvisoryDMX16 hr
Dec 28, 12:55 AM CSTWinter Weather AdvisoryDMX11 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.