Alert archive / Iowa / Jefferson County

Weather alerts in Jefferson County, Iowa, 2015

123 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Jefferson County and its neighbors

Each county as a circle sized by its count in 2015. Tap one for its archive.

Alerts
123
Warnings
27
Watches
24
Advisories
24
Busiest month
June30 alerts
Busiest day
June 7, 20156 alerts

Over time

By month

Warning verification

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

Jefferson County, 2015

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings171418%6100%14 min
Flash flood warnings00

Each office's whole area, 2015

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Quad Cities, IA: tornado warnings25868%4250%17 min
NWS Quad Cities, IA: severe thunderstorm warnings1318634%31672%20 min
NWS Quad Cities, IA: flash flood warnings302323%6088%65 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 4, 3:56 PM CSTWinter Storm WarningDVN34 hr
Jan 4, 3:56 PM CSTWinter Weather AdvisoryDVN34 hr
Jan 5, 12:25 PM CSTMesoscale DiscussionSPC6 hr
Jan 6, 3:42 AM CSTWind Chill WarningDVN36 hr
Jan 7, 3:21 PM CSTWind Chill AdvisoryDVN21 hr
Jan 8, 2:03 PM CSTWinter Weather AdvisoryDVN18 hr
Jan 8, 9:04 PM CSTWind Chill AdvisoryDVN36 hr
Jan 30, 10:38 AM CSTWinter Storm WatchDVN17 hr
Jan 31, 3:53 AM CSTWinter Storm WarningDVN44 hr
Jan 31, 10:13 PM CSTMesoscale DiscussionSPC6 hr
Feb 4, 3:34 AM CSTWinter Weather AdvisoryDVN11 hr
Feb 4, 7:34 AM CSTMesoscale DiscussionSPC4 hr
Feb 17, 3:21 AM CSTWind Chill AdvisoryDVN56 hr
Feb 22, 4:21 AM CSTWind Chill AdvisoryDVN30 hr
Feb 24, 3:03 PM CSTWinter Weather AdvisoryDVN39 hr
Feb 25, 4:31 AM CSTWinter Storm WarningDVN22 hr
Feb 26, 3:14 PM CSTWind Chill AdvisoryDVN18 hr
Mar 2, 3:12 PM CSTWinter Weather AdvisoryDVN21 hr
Mar 10, 1:42 AM CDTDense Fog AdvisoryDVN10 hr
Mar 31, 3:59 PM CDTFire Weather WatchDVN12 hr
Apr 1, 3:42 AM CDTRed Flag WarningDVN15 hr
Apr 7, 10:21 PM CDTSpecial Weather StatementDVN24 min
Apr 7, 10:37 PM CDTSevere Thunderstorm WarningDVN38 min
Apr 7, 10:48 PM CDTSevere Thunderstorm WarningDVN42 min
Apr 7, 11:27 PM CDTSevere Thunderstorm WarningDVN48 min
Apr 8, 12:39 AM CDTSevere Thunderstorm WarningDVN51 min
Apr 9, 12:29 PM CDTMesoscale DiscussionSPC91 min
Apr 9, 12:58 PM CDTTornado WatchSPC6 hr
Apr 9, 3:12 PM CDTMesoscale DiscussionSPC93 min
Apr 9, 6:39 PM CDTSpecial Weather StatementDVN2 hr
Apr 10, 1:09 PM CDTWind AdvisoryDVN6 hr
Apr 20, 9:05 AM CDTSpecial Weather StatementDVN3 hr
Apr 20, 11:49 AM CDTSpecial Weather StatementDVN3 hr
Apr 20, 2:39 PM CDTSpecial Weather StatementDVN3 hr
Apr 22, 3:19 PM CDTFreeze WarningDVN17 hr
May 24, 3:34 PM CDTMesoscale DiscussionSPC56 min
May 24, 5:10 PM CDTSpecial Weather StatementDVN50 min
May 24, 5:34 PM CDTTornado WatchSPC7 hr
Jun 7, 5:14 AM CDTSpecial Weather StatementDVN61 min
Jun 7, 1:52 PM CDTMesoscale DiscussionSPC53 min
Jun 7, 3:33 PM CDTSevere Thunderstorm WatchSPC4 hr
Jun 7, 4:49 PM CDTSpecial Weather StatementDVN26 min
Jun 7, 5:10 PM CDTSevere Thunderstorm WarningDVN40 min
Jun 7, 6:21 PM CDTMesoscale DiscussionSPC84 min
Jun 10, 9:01 PM CDTSevere Thunderstorm WarningDVN29 min
Jun 11, 10:56 AM CDTFlash Flood WatchDVN18 hr
Jun 11, 8:13 PM CDTMesoscale DiscussionSPC92 min
Jun 11, 8:25 PM CDTSevere Thunderstorm WatchSPC5 hr
Jun 15, 7:37 AM CDTFlash Flood WatchDVN13 hr
Jun 20, 3:10 PM CDTMesoscale DiscussionSPC2 hr
Jun 20, 3:49 PM CDTTornado WatchSPC7 hr
Jun 20, 6:33 PM CDTMesoscale DiscussionSPC57 min
Jun 20, 6:40 PM CDTSevere Thunderstorm WarningDVN50 min
Jun 20, 6:59 PM CDTSevere Thunderstorm WarningDVN61 min
Jun 20, 10:12 PM CDTMesoscale DiscussionSPC63 min
Jun 21, 1:45 AM CDTDense Fog AdvisoryDVN7 hr
Jun 22, 1:22 PM CDTMesoscale DiscussionSPC113 min
Jun 22, 3:56 PM CDTTornado WatchSPC9 hr
Jun 22, 5:14 PM CDTSpecial Weather StatementDVN2 hr
Jun 22, 6:08 PM CDTMesoscale DiscussionSPC67 min
Jun 22, 8:16 PM CDTMesoscale DiscussionSPC59 min
Jun 23, 3:39 PM CDTFlash Flood WatchDVN42 hr
Jun 24, 12:39 AM CDTMesoscale DiscussionSPC66 min
Jun 24, 7:49 PM CDTMesoscale DiscussionSPC116 min
Jun 24, 9:26 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 24, 11:23 PM CDTMesoscale DiscussionSPC2 hr
Jun 28, 3:03 PM CDTTornado WatchSPC8 hr
Jun 29, 4:31 AM CDTDense Fog AdvisoryDVN4 hr
Jul 6, 5:12 PM CDTSevere Thunderstorm WarningDVN48 min
Jul 11, 2:15 PM CDTFlash Flood WatchDVN11 hr
Jul 12, 3:31 AM CDTHeat AdvisoryDVN35 hr
Jul 13, 2:20 PM CDTExcessive Heat WarningDVN6 hr
Jul 16, 3:54 AM CDTFlash Flood WatchDVN21 hr
Jul 16, 3:41 PM CDTMesoscale DiscussionSPC2 hr
Jul 17, 3:16 AM CDTHeat AdvisoryDVN33 hr
Jul 18, 12:31 PM CDTMesoscale DiscussionSPC119 min
Jul 24, 12:40 PM CDTSpecial Weather StatementDVN65 min
Jul 24, 1:04 PM CDTSevere Thunderstorm WarningDVN56 min
Jul 25, 3:02 AM CDTHeat AdvisoryDVN9 hr
Jul 25, 6:19 AM CDTSpecial Weather StatementDVN56 min
Jul 27, 12:40 PM CDTMesoscale DiscussionSPC3 hr
Jul 27, 9:13 PM CDTHeat AdvisoryDVN22 hr
Jul 28, 3:24 PM CDTFlash Flood WatchDVN12 hr
Jul 28, 3:40 PM CDTMesoscale DiscussionSPC2 hr
Jul 28, 5:46 PM CDTSevere Thunderstorm WatchSPC6 hr
Jul 28, 6:39 PM CDTSevere Thunderstorm WarningDVN66 min
Jul 28, 8:04 PM CDTMesoscale DiscussionSPC116 min
Jul 28, 10:46 PM CDTMesoscale DiscussionSPC89 min
Aug 2, 6:22 PM CDTMesoscale DiscussionSPC53 min
Aug 2, 6:47 PM CDTSevere Thunderstorm WatchSPC7 hr
Aug 8, 3:27 PM CDTFlash Flood WatchDVN17 hr
Aug 10, 5:03 AM CDTDense Fog AdvisoryDVN3 hr
Aug 17, 4:58 PM CDTSpecial Weather StatementDVN62 min
Aug 30, 12:40 AM CDTDense Fog AdvisoryDVN10 hr
Aug 30, 7:14 PM CDTDense Fog AdvisoryDVN11 hr
Sep 7, 3:24 AM CDTFlash Flood WatchDVN28 hr
Sep 10, 8:22 PM CDTMesoscale DiscussionSPC113 min
Sep 17, 7:54 PM CDTMesoscale DiscussionSPC66 min
Sep 17, 8:06 PM CDTSevere Thunderstorm WarningDVN24 min
Sep 18, 3:39 PM CDTSevere Thunderstorm WarningDVN41 min
Sep 18, 7:36 PM CDTSpecial Weather StatementDVN24 min
Oct 15, 3:08 PM CDTFreeze WatchDVN13 hr
Oct 16, 3:45 AM CDTFreeze WarningDVN29 hr
Oct 18, 2:15 PM CDTRed Flag WarningDVN29 hr
Nov 5, 3:17 PM CSTMesoscale DiscussionSPC118 min
Nov 5, 7:56 PM CSTSpecial Weather StatementDVN49 min
Nov 5, 8:32 PM CSTSpecial Weather StatementDVN43 min
Nov 10, 3:33 PM CSTWind AdvisoryDVN50 hr
Nov 11, 10:17 AM CSTMesoscale DiscussionSPC118 min
Nov 11, 2:24 PM CSTMesoscale DiscussionSPC2 hr
Nov 11, 3:20 PM CSTTornado WatchSPC6 hr
Nov 11, 3:55 PM CSTSevere Thunderstorm WarningDVN65 min
Nov 11, 4:44 PM CSTSevere Thunderstorm WarningDVN61 min
Nov 11, 4:52 PM CSTSevere Thunderstorm WarningDVN53 min
Nov 19, 3:32 PM CSTWinter Weather AdvisoryDVN44 hr
Dec 11, 9:53 PM CSTDense Fog AdvisoryDVN14 hr
Dec 23, 12:42 PM CSTMesoscale DiscussionSPC2 hr
Dec 23, 1:55 PM CSTTornado WatchSPC4 hr
Dec 23, 3:24 PM CSTMesoscale DiscussionSPC96 min
Dec 23, 3:25 PM CSTSevere Thunderstorm WarningDVN35 min
Dec 26, 3:57 PM CSTWinter Storm WatchDVN24 hr
Dec 27, 4:03 PM CSTWinter Storm WarningDVN38 hr
Dec 28, 3:35 AM CSTMesoscale DiscussionSPC6 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 archive20142016

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.