Alert archive / Kansas / Jefferson County

Weather alerts in Jefferson County, Kansas, 2020

139 weather alerts in 2020, 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 2020. Tap one for its archive.

Alerts
139
Warnings
28
Watches
20
Advisories
45
Busiest month
July24 alerts
Busiest day
April 12, 20208 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, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings7614%1173%11 min
Flash flood warnings6350%333%118 min

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Topeka, KS: tornado warnings9189%250%0 min
NWS Topeka, KS: severe thunderstorm warnings1678847%22088%24 min
NWS Topeka, KS: flash flood warnings392049%5094%78 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 9, 3:15 PM CSTWinter Storm WatchTOP13 hr
Jan 10, 4:15 AM CSTWinter Storm WarningTOP34 hr
Jan 10, 4:15 AM CSTWinter Weather AdvisoryTOP34 hr
Jan 10, 12:54 PM CSTMesoscale DiscussionSPC6 hr
Jan 12, 12:47 PM CSTWinter Weather AdvisoryTOP7 hr
Jan 12, 8:28 PM CSTDense Fog AdvisoryTOP15 hr
Jan 13, 5:55 PM CSTDense Fog AdvisoryTOP18 hr
Jan 15, 3:14 PM CSTWinter Weather AdvisoryTOP47 hr
Jan 17, 3:20 AM CSTMesoscale DiscussionSPC6 hr
Jan 21, 3:27 PM CSTWinter Weather AdvisoryTOP21 hr
Jan 23, 3:27 AM CSTWinter Weather AdvisoryTOP27 hr
Jan 29, 4:13 AM CSTWinter Weather AdvisoryTOP3 hr
Feb 3, 3:50 PM CSTWinter Weather AdvisoryTOP45 hr
Feb 11, 2:59 PM CSTWinter Weather AdvisoryTOP33 hr
Feb 12, 3:33 AM CSTWind Chill AdvisoryTOP30 hr
Mar 4, 2:21 PM CSTFire Weather WatchTOP5 hr
Mar 4, 7:24 PM CSTRed Flag WarningTOP23 hr
Mar 6, 2:44 PM CSTFire Weather WatchTOP12 hr
Mar 7, 3:06 AM CSTRed Flag WarningTOP16 hr
Mar 7, 9:44 PM CSTFire Weather WatchTOP9 min
Mar 8, 3:37 AM CDTWind AdvisoryTOP15 hr
Mar 8, 3:41 AM CDTFire Weather WatchTOP7 hr
Mar 19, 2:41 PM CDTMesoscale DiscussionSPC3 hr
Mar 22, 11:27 PM CDTDense Fog AdvisoryTOP12 hr
Mar 26, 9:51 PM CDTMesoscale DiscussionSPC84 min
Mar 26, 10:27 PM CDTSevere Thunderstorm WatchSPC7 hr
Mar 27, 3:40 PM CDTWind AdvisoryTOP28 hr
Apr 2, 3:47 AM CDTWinter Weather AdvisoryTOP34 hr
Apr 3, 3:18 PM CDTFreeze WarningTOP18 hr
Apr 9, 2:27 AM CDTFreeze WarningTOP31 hr
Apr 11, 4:04 PM CDTWind AdvisoryTOP33 hr
Apr 11, 5:35 PM CDTSevere Thunderstorm WatchSPC7 hr
Apr 11, 7:56 PM CDTSevere Thunderstorm WarningTOP49 min
Apr 11, 8:03 PM CDTMesoscale DiscussionSPC57 min
Apr 11, 8:04 PM CDTSevere Thunderstorm WarningTOP26 min
Apr 11, 9:17 PM CDTSpecial Weather StatementTOP43 min
Apr 11, 11:20 PM CDTSevere Thunderstorm WarningTOP40 min
Apr 12, 4:19 AM CDTFreeze WarningTOP30 hr
Apr 12, 10:51 AM CDTSpecial Weather StatementTOP24 min
Apr 12, 11:14 AM CDTSpecial Weather StatementTOP31 min
Apr 13, 3:37 AM CDTFreeze WarningTOP30 hr
Apr 14, 3:46 PM CDTFreeze WarningTOP17 hr
Apr 16, 3:50 AM CDTFreeze WarningTOP29 hr
Apr 17, 2:37 PM CDTFreeze WarningTOP18 hr
Apr 28, 7:54 PM CDTSpecial Weather StatementTOP51 min
Apr 28, 8:43 PM CDTSpecial Weather StatementTOP62 min
Apr 29, 3:44 AM CDTWind AdvisoryTOP15 hr
May 4, 6:33 AM CDTSevere Thunderstorm WatchSPC12 hr
May 4, 8:56 AM CDTSpecial Weather StatementTOP49 min
May 4, 9:00 AM CDTMesoscale DiscussionSPC90 min
May 4, 9:06 AM CDTSevere Thunderstorm WarningTOP54 min
May 4, 10:34 AM CDTSpecial Weather StatementTOP26 min
May 4, 10:38 AM CDTMesoscale DiscussionSPC97 min
May 4, 10:46 AM CDTAreal Flood AdvisoryTOP3 hr
May 8, 2:21 PM CDTFrost AdvisoryTOP17 hr
May 10, 2:29 PM CDTFrost AdvisoryTOP13 hr
May 14, 3:55 PM CDTMesoscale DiscussionSPC95 min
May 14, 4:24 PM CDTSevere Thunderstorm WatchSPC9 hr
May 14, 6:01 PM CDTMesoscale DiscussionSPC119 min
May 14, 8:22 PM CDTMesoscale DiscussionSPC113 min
May 22, 10:10 AM CDTSpecial Weather StatementTOP35 min
May 22, 10:45 AM CDTSpecial Weather StatementTOP60 min
May 24, 3:42 AM CDTFlash Flood WatchTOP56 hr
May 24, 1:13 PM CDTMesoscale DiscussionSPC92 min
May 24, 1:40 PM CDTSevere Thunderstorm WatchSPC6 hr
May 25, 1:11 PM CDTSpecial Weather StatementTOP34 min
May 25, 1:24 PM CDTSpecial Weather StatementTOP36 min
May 25, 1:54 PM CDTSpecial Weather StatementTOP36 min
May 27, 1:11 PM CDTAreal Flood WarningTOP20 hr
Jun 3, 8:54 PM CDTMesoscale DiscussionSPC2 hr
Jun 3, 9:38 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 3, 10:44 PM CDTMesoscale DiscussionSPC2 hr
Jun 4, 12:54 AM CDTMesoscale DiscussionSPC96 min
Jun 4, 1:02 AM CDTSpecial Weather StatementTOP58 min
Jun 4, 11:32 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 5, 1:59 AM CDTMesoscale DiscussionSPC91 min
Jun 5, 2:14 AM CDTSpecial Weather StatementTOP46 min
Jun 5, 2:58 PM CDTHeat AdvisoryTOP28 hr
Jun 8, 3:40 PM CDTHigh Wind WatchTOP12 hr
Jun 9, 3:31 AM CDTWind AdvisoryTOP32 hr
Jun 9, 6:43 PM CDTMesoscale DiscussionSPC92 min
Jun 18, 6:30 PM CDTMesoscale DiscussionSPC2 hr
Jun 22, 6:40 PM CDTMesoscale DiscussionSPC2 hr
Jun 22, 8:10 PM CDTSpecial Weather StatementTOP50 min
Jun 26, 7:50 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 27, 1:28 AM CDTMesoscale DiscussionSPC2 hr
Jun 27, 2:02 AM CDTSpecial Weather StatementTOP28 min
Jun 27, 2:50 AM CDTAreal Flood AdvisoryTOP3 hr
Jun 27, 4:18 AM CDTAreal Flood AdvisoryTOP3 hr
Jun 29, 2:57 PM CDTHeat AdvisoryTOP29 hr
Jul 3, 2:29 PM CDTAreal Flood AdvisoryTOP3 hr
Jul 3, 3:11 PM CDTFlash Flood WarningTOP94 min
Jul 9, 1:09 AM CDTSevere Thunderstorm WatchSPC11 hr
Jul 9, 2:09 AM CDTSevere Thunderstorm WarningTOP66 min
Jul 9, 3:10 AM CDTMesoscale DiscussionSPC2 hr
Jul 9, 3:19 AM CDTSevere Thunderstorm WarningTOP56 min
Jul 11, 12:43 PM CDTMesoscale DiscussionSPC92 min
Jul 11, 1:35 PM CDTSevere Thunderstorm WatchSPC4 hr
Jul 11, 2:34 PM CDTSevere Thunderstorm WarningTOP41 min
Jul 14, 3:12 AM CDTHeat AdvisoryTOP17 hr
Jul 16, 3:05 PM CDTHeat AdvisoryTOP53 hr
Jul 19, 3:00 PM CDTMesoscale DiscussionSPC2 hr
Jul 20, 6:46 AM CDTSpecial Weather StatementTOP29 min
Jul 20, 7:12 AM CDTSpecial Weather StatementTOP63 min
Jul 21, 12:38 AM CDTFlash Flood WarningTOP4 hr
Jul 21, 4:23 AM CDTAreal Flood WarningTOP3 hr
Jul 26, 3:45 AM CDTHeat AdvisoryTOP15 hr
Jul 29, 10:04 AM CDTFlash Flood WatchTOP41 hr
Jul 29, 3:56 PM CDTAreal Flood AdvisoryTOP2 hr
Jul 29, 4:39 PM CDTFlash Flood WarningTOP4 hr
Jul 30, 1:25 PM CDTFlash Flood WarningTOP3 hr
Jul 30, 4:38 PM CDTAreal Flood WarningTOP3 hr
Jul 30, 5:12 PM CDTFlash Flood WarningTOP6 hr
Jul 30, 5:35 PM CDTFlash Flood WarningTOP6 hr
Aug 7, 3:26 PM CDTHeat AdvisoryTOP29 hr
Aug 9, 3:18 AM CDTHeat AdvisoryTOP17 hr
Aug 31, 4:34 AM CDTSpecial Weather StatementTOP26 min
Aug 31, 4:56 AM CDTMesoscale DiscussionSPC2 hr
Sep 2, 5:04 AM CDTDense Fog AdvisoryTOP4 hr
Sep 27, 10:53 AM CDTMesoscale DiscussionSPC97 min
Oct 11, 3:35 AM CDTWind AdvisoryTOP25 hr
Oct 15, 2:49 PM CDTFrost AdvisoryTOP18 hr
Oct 16, 3:01 PM CDTWind AdvisoryTOP24 hr
Oct 21, 2:46 PM CDTDense Fog AdvisoryTOP19 hr
Oct 21, 2:46 PM CDTWind AdvisoryTOP26 hr
Oct 22, 3:38 AM CDTFreeze WatchTOP23 hr
Oct 23, 2:50 AM CDTFreeze WarningTOP31 hr
Oct 25, 3:19 AM CDTWinter Weather AdvisoryTOP60 hr
Oct 27, 11:01 AM CDTMesoscale DiscussionSPC2 hr
Nov 14, 3:33 AM CSTWind AdvisoryTOP22 hr
Nov 17, 2:32 PM CSTFire Weather WatchTOP12 hr
Nov 17, 2:42 PM CSTWind AdvisoryTOP27 hr
Nov 18, 2:07 AM CSTRed Flag WarningTOP22 hr
Dec 18, 2:17 AM CSTWind AdvisoryTOP14 hr
Dec 22, 2:56 AM CSTWind AdvisoryTOP20 hr
Dec 22, 2:33 PM CSTWind AdvisoryTOP27 hr
Dec 28, 3:19 AM CSTWinter Weather AdvisoryTOP39 hr
Dec 29, 4:00 AM CSTMesoscale DiscussionSPC6 hr
Dec 29, 10:02 AM CSTMesoscale DiscussionSPC5 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 archive20192021

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.