Alert archive / Missouri / Saint Charles County

Weather alerts in Saint Charles County, Missouri, 2012

127 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Saint Charles County and its neighbors

Each county as a circle sized by its count in 2012. Tap one for its archive.

Alerts
127
Warnings
54
Watches
22
Advisories
23
Busiest month
April24 alerts
Busiest day
April 28, 20129 alerts

Over time

By month

Warning verification

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

0 of 5 tornado warnings covering Saint Charles County in 2012 had a tornado report inside them; 0 of 3 tornado reports fell inside a warning.

Saint Charles County, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings50100%30%
Severe thunderstorm warnings382826%7595%22 min
Flash flood warnings00

Each office's whole area, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS St. Louis, MO: tornado warnings27678%2055%11 min
NWS St. Louis, MO: severe thunderstorm warnings34616353%60181%22 min
NWS St. Louis, MO: flash flood warnings28968%1788%144 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 11, 3:18 PM CSTWinter Weather AdvisoryLSX33 hr
Jan 16, 11:47 PM CSTTornado WatchSPC7 hr
Jan 17, 12:55 AM CSTSevere Thunderstorm WarningLSX35 min
Jan 17, 1:23 AM CSTSevere Thunderstorm WarningLSX37 min
Jan 17, 4:34 AM CSTAreal Flood AdvisoryLSX60 days
Jan 20, 11:23 AM CSTWinter Weather AdvisoryLSX12 hr
Feb 4, 6:59 AM CSTRiver Flood WarningLSX9 hr
Feb 5, 11:42 PM CSTDense Fog AdvisoryLSX9 hr
Feb 12, 3:02 PM CSTWinter Weather AdvisoryLSX39 hr
Feb 23, 2:28 PM CSTWind AdvisoryLSX16 hr
Feb 26, 5:25 AM CSTRed Flag WarningLSX12 hr
Feb 29, 12:49 AM CSTMesoscale DiscussionSPC56 min
Feb 29, 1:14 AM CSTTornado WatchSPC11 hr
Mar 2, 2:07 AM CSTSevere Thunderstorm WatchSPC5 hr
Mar 2, 4:25 AM CSTMesoscale DiscussionSPC95 min
Mar 2, 5:10 AM CSTSevere Thunderstorm WarningLSX39 min
Mar 2, 5:13 AM CSTSevere Thunderstorm WarningLSX47 min
Mar 2, 5:52 AM CSTSevere Thunderstorm WatchSPC6 hr
Mar 2, 5:56 AM CSTSevere Thunderstorm WarningLSX49 min
Mar 2, 1:59 PM CSTWind AdvisoryLSX4 hr
Mar 5, 2:00 PM CSTRed Flag WarningLSX30 hr
Mar 5, 3:36 PM CSTWind AdvisoryLSX26 hr
Mar 6, 3:41 PM CSTWind AdvisoryLSX24 hr
Mar 15, 3:23 PM CDTSevere Thunderstorm WarningLSX37 min
Mar 15, 3:59 PM CDTSevere Thunderstorm WarningLSX46 min
Mar 15, 4:12 PM CDTSevere Thunderstorm WarningLSX33 min
Mar 15, 4:46 PM CDTSevere Thunderstorm WarningLSX29 min
Mar 15, 9:39 PM CDTSevere Thunderstorm WarningLSX35 min
Mar 17, 3:38 PM CDTFlash Flood WatchLSX6 hr
Mar 17, 5:13 PM CDTAreal Flood AdvisoryLSX4 hr
Mar 17, 7:35 PM CDTRiver Flood WarningLSX23 hr
Mar 23, 1:58 PM CDTMesoscale DiscussionSPC2 hr
Mar 23, 6:43 PM CDTMesoscale DiscussionSPC32 min
Apr 9, 3:10 PM CDTFreeze WatchLSX12 hr
Apr 10, 2:45 AM CDTFreeze WarningLSX29 hr
Apr 11, 3:20 AM CDTFreeze WarningLSX29 hr
Apr 13, 9:19 PM CDTFlash Flood WatchLSX13 hr
Apr 14, 11:14 AM CDTRiver Flood WarningLSX20 hr
Apr 15, 3:50 AM CDTWind AdvisoryLSX17 hr
Apr 15, 4:22 PM CDTMesoscale DiscussionSPC83 min
Apr 15, 4:42 PM CDTTornado WatchSPC6 hr
Apr 15, 7:28 PM CDTMesoscale DiscussionSPC62 min
Apr 15, 7:38 PM CDTSevere Thunderstorm WarningLSX32 min
Apr 16, 6:19 AM CDTRiver Flood WarningLSX6 hr
Apr 25, 4:36 PM CDTMesoscale DiscussionSPC84 min
Apr 25, 10:11 PM CDTMesoscale DiscussionSPC2 hr
Apr 28, 1:17 PM CDTMesoscale DiscussionSPC88 min
Apr 28, 1:48 PM CDTSevere Thunderstorm WatchSPC7 hr
Apr 28, 2:26 PM CDTSevere Thunderstorm WarningLSX49 min
Apr 28, 2:56 PM CDTMesoscale DiscussionSPC64 min
Apr 28, 3:05 PM CDTSevere Thunderstorm WarningLSX40 min
Apr 28, 5:19 PM CDTSevere Thunderstorm WarningLSX41 min
Apr 28, 5:50 PM CDTSevere Thunderstorm WarningLSX40 min
Apr 28, 5:59 PM CDTMesoscale DiscussionSPC2 hr
Apr 28, 6:01 PM CDTTornado WarningLSX29 min
Apr 29, 1:44 AM CDTSevere Thunderstorm WarningLSX46 min
Apr 29, 4:00 PM CDTFlash Flood WatchLSX15 hr
May 1, 2:01 AM CDTFlash Flood WatchLSX7 hr
May 4, 10:18 PM CDTMesoscale DiscussionSPC87 min
May 4, 10:35 PM CDTSevere Thunderstorm WatchSPC8 hr
May 20, 1:33 PM CDTMesoscale DiscussionSPC87 min
Jun 2, 1:05 PM CDTMesoscale DiscussionSPC115 min
Jun 4, 2:38 PM CDTMesoscale DiscussionSPC2 hr
Jun 4, 3:25 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 4, 3:33 PM CDTSevere Thunderstorm WarningLSX42 min
Jun 4, 4:08 PM CDTSevere Thunderstorm WarningLSX37 min
Jun 16, 7:58 PM CDTMesoscale DiscussionSPC92 min
Jun 16, 8:23 PM CDTSevere Thunderstorm WatchSPC3 hr
Jun 16, 8:28 PM CDTSevere Thunderstorm WarningLSX47 min
Jun 17, 5:34 PM CDTMesoscale DiscussionSPC86 min
Jun 27, 3:24 AM CDTHeat AdvisoryLSX12 days
Jun 29, 3:30 PM CDTExcessive Heat WarningLSX8 days
Jul 2, 2:34 PM CDTSevere Thunderstorm WarningLSX26 min
Jul 2, 5:16 PM CDTMesoscale DiscussionSPC2 hr
Jul 15, 3:51 PM CDTHeat AdvisoryLSX4 days
Jul 19, 2:59 PM CDTExcessive Heat WatchLSX13 hr
Jul 20, 4:00 AM CDTExcessive Heat WarningLSX7 days
Jul 30, 3:29 PM CDTHeat AdvisoryLSX29 hr
Aug 1, 3:42 AM CDTHeat AdvisoryLSX15 hr
Aug 2, 3:54 PM CDTHeat AdvisoryLSX52 hr
Aug 4, 3:08 AM CDTMesoscale DiscussionSPC2 hr
Aug 4, 5:20 PM CDTMesoscale DiscussionSPC85 min
Aug 4, 6:12 PM CDTSevere Thunderstorm WatchSPC6 hr
Aug 4, 9:38 PM CDTSevere Thunderstorm WarningLSX67 min
Aug 4, 10:22 PM CDTSevere Thunderstorm WarningLSX38 min
Aug 4, 11:46 PM CDTSevere Thunderstorm WarningLSX33 min
Aug 8, 9:31 PM CDTSevere Thunderstorm WarningLSX44 min
Aug 8, 10:51 PM CDTAreal Flood AdvisoryLSX4 hr
Aug 16, 12:47 PM CDTMesoscale DiscussionSPC88 min
Aug 16, 1:05 PM CDTSevere Thunderstorm WatchSPC7 hr
Aug 16, 3:08 PM CDTSevere Thunderstorm WarningLSX52 min
Aug 31, 1:26 PM CDTMesoscale DiscussionSPC64 min
Aug 31, 1:56 PM CDTTornado WatchSPC8 hr
Aug 31, 2:48 PM CDTTornado WarningLSX17 min
Aug 31, 5:34 PM CDTTornado WarningLSX11 min
Aug 31, 6:01 PM CDTMesoscale DiscussionSPC89 min
Sep 5, 3:07 AM CDTHeat AdvisoryLSX12 hr
Sep 6, 2:03 PM CDTMesoscale DiscussionSPC57 min
Sep 6, 4:02 PM CDTSevere Thunderstorm WarningLSX43 min
Sep 7, 2:35 PM CDTSevere Thunderstorm WatchSPC6 hr
Sep 7, 4:46 PM CDTSevere Thunderstorm WarningLSX44 min
Sep 7, 5:03 PM CDTSevere Thunderstorm WarningLSX42 min
Sep 7, 5:22 PM CDTSevere Thunderstorm WarningLSX23 min
Sep 7, 6:22 PM CDTSevere Thunderstorm WarningLSX53 min
Sep 25, 12:51 AM CDTMesoscale DiscussionSPC114 min
Sep 25, 12:59 PM CDTMesoscale DiscussionSPC61 min
Sep 25, 4:31 PM CDTSevere Thunderstorm WarningLSX44 min
Sep 25, 5:05 PM CDTSevere Thunderstorm WatchSPC6 hr
Sep 25, 5:09 PM CDTSevere Thunderstorm WarningLSX51 min
Sep 25, 6:57 PM CDTMesoscale DiscussionSPC93 min
Sep 25, 7:05 PM CDTSevere Thunderstorm WarningLSX40 min
Oct 7, 3:13 AM CDTFrost AdvisoryLSX30 hr
Oct 17, 11:45 AM CDTMesoscale DiscussionSPC90 min
Oct 17, 1:58 PM CDTSevere Thunderstorm WatchSPC6 hr
Oct 17, 4:24 PM CDTSevere Thunderstorm WarningLSX51 min
Oct 17, 4:54 PM CDTSevere Thunderstorm WarningLSX51 min
Oct 17, 4:58 PM CDTTornado WarningLSX32 min
Oct 17, 5:06 PM CDTTornado WarningLSX24 min
Oct 17, 5:23 PM CDTSevere Thunderstorm WarningLSX52 min
Oct 25, 3:47 PM CDTFreeze WatchLSX12 hr
Oct 26, 3:35 AM CDTFreeze WarningLSX28 hr
Oct 27, 2:32 PM CDTFreeze WarningLSX17 hr
Oct 28, 2:39 PM CDTFreeze WarningLSX17 hr
Nov 11, 4:24 AM CSTWind AdvisoryLSX11 hr
Nov 20, 5:44 PM CSTDense Fog AdvisoryLSX20 hr
Dec 19, 3:34 PM CSTWind AdvisoryLSX29 hr
Dec 30, 3:03 PM CSTWinter Weather AdvisoryLSX39 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 archive20112013

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.