Alert archive / Missouri / Knox County

Weather alerts in Knox County, Missouri, 2013

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

Knox County and its neighbors

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

Alerts
77
Warnings
17
Watches
20
Advisories
12
Busiest month
May18 alerts
Busiest day
May 28, 20136 alerts

Over time

By month

Warning verification

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

Knox County, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings50100%20%
Flash flood warnings3167%0

Each office's whole area, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS St. Louis, MO: tornado warnings431370%4088%18 min
NWS St. Louis, MO: severe thunderstorm warnings1577652%31872%21 min
NWS St. Louis, MO: flash flood warnings481863%6484%111 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 12, 4:14 AM CSTWinter Weather AdvisoryLSX24 hr
Jan 26, 4:12 AM CSTFreezing Rain AdvisoryLSX32 hr
Jan 27, 2:36 AM CSTMesoscale DiscussionSPC4 hr
Jan 29, 4:08 PM CSTWinter Weather AdvisoryLSX23 hr
Feb 19, 3:47 AM CSTWinter Storm WatchLSX25 hr
Feb 20, 4:42 AM CSTWinter Storm WarningLSX47 hr
Feb 21, 6:16 AM CSTMesoscale DiscussionSPC5 hr
Feb 21, 11:19 AM CSTMesoscale DiscussionSPC4 hr
Feb 23, 3:53 PM CSTWinter Storm WatchLSX36 hr
Feb 25, 3:42 AM CSTWinter Storm WarningLSX33 hr
Feb 26, 2:22 AM CSTMesoscale DiscussionSPC5 hr
Feb 26, 12:19 PM CSTWinter Weather AdvisoryLSX30 hr
Mar 9, 3:53 PM CSTFlood WatchLSX23 hr
Mar 11, 1:41 AM CDTAreal Flood WarningLSX12 hr
Mar 22, 4:11 AM CDTWinter Storm WatchLSX34 hr
Mar 23, 4:17 AM CDTWinter Storm WarningLSX44 hr
Apr 14, 3:28 AM CDTWind AdvisoryLSX16 hr
Apr 16, 4:30 PM CDTFlash Flood WatchLSX50 hr
Apr 17, 8:49 AM CDTMesoscale DiscussionSPC56 min
Apr 17, 9:14 AM CDTSevere Thunderstorm WatchSPC10 hr
Apr 17, 11:11 AM CDTTornado WatchSPC11 hr
Apr 17, 1:33 PM CDTMesoscale DiscussionSPC57 min
Apr 17, 7:39 PM CDTSevere Thunderstorm WarningLSX51 min
Apr 17, 7:46 PM CDTFlash Flood WarningLSX8 hr
Apr 17, 9:40 PM CDTFlash Flood WarningLSX6 hr
Apr 18, 3:32 AM CDTFlash Flood WarningLSX12 hr
Apr 18, 3:34 PM CDTAreal Flood WarningLSX24 hr
Apr 19, 4:27 AM CDTFreeze WarningLSX28 hr
May 19, 11:30 AM CDTMesoscale DiscussionSPC90 min
May 19, 5:54 PM CDTMesoscale DiscussionSPC66 min
May 19, 6:25 PM CDTTornado WatchSPC9 hr
May 19, 10:16 PM CDTMesoscale DiscussionSPC59 min
May 20, 5:24 PM CDTTornado WatchSPC7 hr
May 20, 5:55 PM CDTSevere Thunderstorm WarningLSX35 min
May 26, 6:47 PM CDTMesoscale DiscussionSPC88 min
May 27, 3:54 PM CDTFlash Flood WatchLSX18 hr
May 28, 2:48 AM CDTSevere Thunderstorm WarningLSX42 min
May 28, 3:30 AM CDTMesoscale DiscussionSPC90 min
May 28, 1:37 PM CDTMesoscale DiscussionSPC113 min
May 28, 2:23 PM CDTTornado WatchSPC8 hr
May 28, 2:51 PM CDTFlash Flood WatchLSX13 hr
May 28, 5:52 PM CDTMesoscale DiscussionSPC83 min
May 28, 9:20 PM CDTMesoscale DiscussionSPC55 min
May 30, 4:03 AM CDTFlash Flood WatchLSX51 hr
May 30, 12:32 PM CDTTornado WatchSPC7 hr
May 30, 2:38 PM CDTSevere Thunderstorm WarningLSX22 min
Jun 15, 1:50 AM CDTSpecial Weather StatementEAX10 min
Jun 15, 3:56 PM CDTMesoscale DiscussionSPC2 hr
Jun 15, 7:27 PM CDTFlash Flood WatchLSX9 hr
Jun 24, 10:35 AM CDTMesoscale DiscussionSPC55 min
Jun 24, 12:14 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 24, 2:11 PM CDTMesoscale DiscussionSPC2 hr
Jun 25, 9:44 PM CDTMesoscale DiscussionSPC91 min
Jun 26, 1:43 AM CDTMesoscale DiscussionSPC92 min
Jun 26, 2:09 AM CDTSevere Thunderstorm WatchSPC5 hr
Jun 26, 3:40 PM CDTMesoscale DiscussionSPC95 min
Jul 22, 3:33 AM CDTDense Fog AdvisoryLSX4 hr
Jul 22, 11:27 PM CDTSevere Thunderstorm WarningLSX48 min
Aug 6, 5:44 AM CDTDense Fog AdvisoryLSX3 hr
Aug 6, 9:37 PM CDTMesoscale DiscussionSPC113 min
Aug 7, 2:41 AM CDTMesoscale DiscussionSPC2 hr
Aug 7, 5:32 AM CDTMesoscale DiscussionSPC103 min
Sep 29, 3:52 AM CDTDense Fog AdvisoryLSX5 hr
Oct 22, 3:59 AM CDTFreeze WarningLSX28 hr
Oct 23, 3:26 PM CDTFreeze WarningLSX42 hr
Oct 30, 5:11 AM CDTDense Fog AdvisoryLSX4 hr
Oct 30, 9:29 AM CDTMesoscale DiscussionSPC91 min
Oct 30, 1:26 PM CDTMesoscale DiscussionSPC94 min
Oct 30, 4:05 PM CDTFlash Flood WatchLSX20 hr
Nov 16, 3:56 PM CSTWind AdvisoryLSX26 hr
Nov 17, 7:47 AM CSTMesoscale DiscussionSPC88 min
Dec 2, 10:52 PM CSTDense Fog AdvisoryLSX11 hr
Dec 12, 3:50 AM CSTWinter Storm WatchLSX24 hr
Dec 12, 3:41 PM CSTWinter Weather AdvisoryLSX43 hr
Dec 20, 4:19 AM CSTWinter Storm WatchLSX11 hr
Dec 20, 3:43 PM CSTWinter Storm WarningLSX36 hr
Dec 21, 12:53 PM CSTMesoscale DiscussionSPC4 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.