Alert archive / Missouri / Boone County

Weather alerts in Boone County, Missouri, 2009

118 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Boone County and its neighbors

Each county as a circle sized by its count in 2009. Tap one for its archive.

Alerts
118
Warnings
45
Watches
27
Advisories
24
Busiest month
June30 alerts
Busiest day
May 15, 20097 alerts

Over time

By month

Warning verification

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

Boone County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings141029%1878%21 min
Flash flood warnings12558%1872%107 min

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS St. Louis, MO: tornado warnings621281%3080%19 min
NWS St. Louis, MO: severe thunderstorm warnings2148461%31659%20 min
NWS St. Louis, MO: flash flood warnings974851%13878%120 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, 3:12 PM CSTWind AdvisoryLSX9 hr
Jan 14, 3:42 AM CSTWind Chill AdvisoryLSX39 hr
Jan 26, 4:05 AM CSTWinter Weather AdvisoryLSX44 hr
Feb 9, 4:01 PM CSTFlash Flood WatchLSX44 hr
Feb 26, 6:57 AM CSTMesoscale DiscussionSPC93 min
Feb 26, 8:10 AM CSTSevere Thunderstorm WarningLSX35 min
Feb 26, 9:26 AM CSTMesoscale DiscussionSPC2 hr
Feb 26, 12:51 PM CSTMesoscale DiscussionSPC114 min
Feb 26, 5:19 PM CSTSevere Thunderstorm WatchSPC7 hr
Feb 26, 6:05 PM CSTSevere Thunderstorm WarningLSX40 min
Feb 27, 3:27 PM CSTWinter Weather AdvisoryLSX27 hr
Mar 5, 10:17 AM CSTWind AdvisoryLSX8 hr
Mar 8, 5:56 AM CDTMesoscale DiscussionSPC64 min
Mar 8, 6:32 AM CDTTornado WatchSPC7 hr
Mar 8, 8:37 AM CDTSevere Thunderstorm WarningLSX38 min
Mar 8, 12:16 PM CDTWind AdvisoryLSX7 hr
Mar 23, 3:15 AM CDTWind AdvisoryLSX17 hr
Mar 24, 7:24 AM CDTSevere Thunderstorm WarningLSX32 min
Mar 24, 1:50 PM CDTFlash Flood WarningLSX6 hr
Mar 24, 7:55 PM CDTAreal Flood WarningLSX12 hr
Mar 26, 3:34 PM CDTWinter Storm WatchLSX36 hr
Mar 28, 3:31 AM CDTWinter Weather AdvisoryLSX24 hr
Apr 3, 2:14 PM CDTFrost AdvisoryLSX19 hr
Apr 3, 2:14 PM CDTFreeze WatchLSX4 days
Apr 5, 4:35 AM CDTFreeze WarningLSX28 hr
Apr 5, 3:25 PM CDTFreeze WarningLSX41 hr
Apr 7, 1:05 PM CDTFreeze WarningLSX19 hr
Apr 10, 4:09 AM CDTFrost AdvisoryLSX28 hr
Apr 14, 4:11 AM CDTFrost AdvisoryLSX28 hr
Apr 29, 3:53 AM CDTFlash Flood WatchLSX36 hr
Apr 29, 10:47 PM CDTAreal Flood AdvisoryLSX6 hr
Apr 30, 12:38 AM CDTFlash Flood WarningLSX5 hr
Apr 30, 5:33 AM CDTAreal Flood WarningLSX6 hr
Apr 30, 11:30 AM CDTAreal Flood WarningLSX6 hr
Apr 30, 5:13 PM CDTAreal Flood WarningLSX12 hr
May 7, 6:14 PM CDTSevere Thunderstorm WatchSPC8 hr
May 7, 9:38 PM CDTMesoscale DiscussionSPC97 min
May 7, 10:04 PM CDTSevere Thunderstorm WarningLSX56 min
May 7, 10:52 PM CDTSevere Thunderstorm WarningLSX53 min
May 13, 1:52 PM CDTMesoscale DiscussionSPC23 min
May 13, 3:04 PM CDTFlash Flood WatchLSX12 hr
May 13, 4:51 PM CDTSevere Thunderstorm WatchSPC6 hr
May 14, 3:51 PM CDTFlash Flood WatchLSX32 hr
May 15, 2:03 AM CDTMesoscale DiscussionSPC87 min
May 15, 12:50 PM CDTTornado WatchSPC7 hr
May 15, 3:43 PM CDTMesoscale DiscussionSPC62 min
May 15, 4:30 PM CDTSevere Thunderstorm WarningLSX45 min
May 15, 5:12 PM CDTFlash Flood WarningLSX6 hr
May 15, 5:28 PM CDTSevere Thunderstorm WarningLSX47 min
May 15, 5:31 PM CDTMesoscale DiscussionSPC119 min
May 15, 11:00 PM CDTAreal Flood WarningLSX9 hr
May 16, 8:51 AM CDTAreal Flood WarningLSX12 hr
Jun 2, 4:09 AM CDTFlash Flood WatchLSX16 hr
Jun 2, 11:58 AM CDTMesoscale DiscussionSPC92 min
Jun 2, 12:27 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 2, 6:28 PM CDTAreal Flood AdvisoryLSX3 hr
Jun 7, 12:18 PM CDTMesoscale DiscussionSPC57 min
Jun 7, 5:31 PM CDTMesoscale DiscussionSPC59 min
Jun 8, 3:25 AM CDTMesoscale DiscussionSPC65 min
Jun 9, 4:00 PM CDTFlash Flood WatchLSX12 hr
Jun 10, 5:15 PM CDTTornado WatchSPC7 hr
Jun 15, 8:28 AM CDTAreal Flood AdvisoryLSX6 hr
Jun 15, 3:42 PM CDTFlash Flood WatchLSX20 hr
Jun 15, 11:18 PM CDTMesoscale DiscussionSPC87 min
Jun 16, 12:04 AM CDTSevere Thunderstorm WarningLSX56 min
Jun 16, 12:41 AM CDTSevere Thunderstorm WatchSPC4 hr
Jun 16, 12:42 AM CDTFlash Flood WarningLSX7 hr
Jun 16, 12:49 AM CDTSevere Thunderstorm WarningLSX56 min
Jun 16, 3:53 AM CDTMesoscale DiscussionSPC67 min
Jun 17, 3:09 PM CDTTornado WatchSPC7 hr
Jun 17, 6:42 PM CDTMesoscale DiscussionSPC2 hr
Jun 17, 6:46 PM CDTSevere Thunderstorm WarningLSX44 min
Jun 17, 7:29 PM CDTSevere Thunderstorm WarningLSX46 min
Jun 17, 7:41 PM CDTFlash Flood WarningLSX4 hr
Jun 17, 8:45 PM CDTSevere Thunderstorm WarningLSX17 min
Jun 21, 2:24 PM CDTHeat AdvisoryLSX6 days
Jun 23, 5:52 PM CDTSevere Thunderstorm WatchSPC4 hr
Jun 23, 9:21 PM CDTMesoscale DiscussionSPC54 min
Jun 27, 5:43 PM CDTMesoscale DiscussionSPC62 min
Jun 27, 5:54 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 27, 7:39 PM CDTMesoscale DiscussionSPC2 hr
Jun 27, 9:44 PM CDTSevere Thunderstorm WarningLSX46 min
Jul 4, 4:34 AM CDTAreal Flood AdvisoryLSX6 hr
Jul 4, 6:18 AM CDTFlash Flood WarningLSX6 hr
Jul 4, 12:00 PM CDTAreal Flood WarningLSX32 hr
Jul 9, 11:54 AM CDTMesoscale DiscussionSPC96 min
Jul 25, 2:17 AM CDTMesoscale DiscussionSPC88 min
Aug 4, 4:06 AM CDTSevere Thunderstorm WatchSPC5 hr
Aug 10, 4:09 AM CDTAreal Flood AdvisoryLSX6 hr
Aug 17, 1:44 PM CDTMesoscale DiscussionSPC2 hr
Aug 19, 3:20 PM CDTFlash Flood WatchLSX13 hr
Aug 29, 3:47 AM CDTDense Fog AdvisoryLSX5 hr
Sep 5, 10:07 PM CDTDense Fog AdvisoryLSX12 hr
Sep 6, 9:04 PM CDTDense Fog AdvisoryLSX12 hr
Sep 21, 4:07 AM CDTDense Fog AdvisoryLSX5 hr
Oct 7, 4:18 AM CDTFlash Flood WatchLSX47 hr
Oct 8, 7:01 AM CDTFlash Flood WarningLSX6 hr
Oct 8, 10:42 AM CDTFlash Flood WarningLSX3 hr
Oct 8, 12:12 PM CDTFlash Flood WarningLSX6 hr
Oct 8, 6:04 PM CDTAreal Flood WarningLSX18 hr
Oct 9, 12:01 PM CDTAreal Flood WarningLSX7 hr
Oct 9, 4:07 PM CDTFrost AdvisoryLSX16 hr
Oct 9, 7:00 PM CDTAreal Flood WarningLSX18 hr
Oct 10, 3:55 AM CDTFreeze WarningLSX23 hr
Oct 17, 4:22 AM CDTFrost AdvisoryLSX29 hr
Oct 17, 3:31 PM CDTFreeze WarningLSX17 hr
Oct 22, 6:57 PM CDTFlash Flood WarningLSX6 hr
Oct 23, 12:57 AM CDTAreal Flood WarningLSX9 hr
Oct 23, 10:07 AM CDTAreal Flood WarningLSX6 hr
Oct 28, 3:58 PM CDTFlash Flood WatchLSX47 hr
Oct 29, 4:48 PM CDTFlash Flood WarningLSX5 hr
Oct 29, 9:46 PM CDTFlash Flood WarningLSX5 hr
Oct 30, 2:27 AM CDTAreal Flood WarningLSX12 hr
Oct 30, 2:48 PM CDTAreal Flood WarningLSX24 hr
Nov 15, 2:02 PM CSTFlood WatchLSX37 hr
Dec 8, 2:48 PM CSTWind AdvisoryLSX25 hr
Dec 22, 3:39 PM CSTFlood WatchLSX61 hr
Dec 24, 3:56 AM CSTWinter Storm WatchLSX11 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 archive20082010

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.