Alert archive / Missouri / Franklin County

Weather alerts in Franklin County, Missouri, 2009

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

Franklin County and its neighbors

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

Alerts
130
Warnings
52
Watches
26
Advisories
20
Busiest month
June29 alerts
Busiest day
May 8, 20098 alerts

Over time

By month

Warning verification

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

Franklin County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings17853%888%21 min
Flash flood warnings9544%4100%50 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 25, 4:08 AM CSTWinter Storm WatchLSX24 hr
Jan 26, 4:05 AM CSTWinter Storm WarningLSX50 hr
Jan 26, 6:59 PM CSTMesoscale DiscussionSPC5 hr
Jan 27, 6:25 PM CSTMesoscale DiscussionSPC6 hr
Feb 9, 4:01 PM CSTFlash Flood WatchLSX44 hr
Feb 10, 11:45 PM CSTTornado WatchSPC6 hr
Feb 11, 2:30 AM CSTMesoscale DiscussionSPC90 min
Feb 11, 10:27 AM CSTRiver Flood WarningLSX72 hr
Feb 26, 6:57 AM CSTMesoscale DiscussionSPC93 min
Feb 26, 9:26 AM CSTMesoscale DiscussionSPC2 hr
Feb 26, 5:19 PM CSTSevere Thunderstorm WatchSPC7 hr
Feb 26, 7:42 PM CSTMesoscale DiscussionSPC93 min
Mar 5, 10:17 AM CSTWind AdvisoryLSX8 hr
Mar 8, 6:32 AM CDTTornado WatchSPC7 hr
Mar 8, 9:21 AM CDTSevere Thunderstorm WarningLSX39 min
Mar 8, 9:26 AM CDTMesoscale DiscussionSPC64 min
Mar 8, 9:49 AM CDTSevere Thunderstorm WarningLSX26 min
Mar 8, 10:16 AM CDTSevere Thunderstorm WarningLSX35 min
Mar 8, 10:36 AM CDTSevere Thunderstorm WarningLSX24 min
Mar 8, 12:16 PM CDTWind AdvisoryLSX7 hr
Mar 10, 3:15 PM CDTMesoscale DiscussionSPC2 hr
Mar 18, 2:22 PM CDTMesoscale DiscussionSPC113 min
Mar 23, 3:15 AM CDTWind AdvisoryLSX17 hr
Mar 24, 3:58 AM CDTWind AdvisoryLSX14 hr
Mar 24, 9:38 AM CDTMesoscale DiscussionSPC97 min
Mar 24, 12:02 PM CDTMesoscale DiscussionSPC88 min
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, 10:00 AM CDTRiver Flood WarningLSX6 days
May 7, 9:38 PM CDTMesoscale DiscussionSPC97 min
May 7, 10:17 PM CDTSevere Thunderstorm WatchSPC8 hr
May 7, 11:38 PM CDTSevere Thunderstorm WarningLSX57 min
May 7, 11:46 PM CDTMesoscale DiscussionSPC89 min
May 8, 7:51 AM CDTSevere Thunderstorm WarningLSX39 min
May 8, 8:06 AM CDTSevere Thunderstorm WarningLSX39 min
May 8, 8:38 AM CDTSevere Thunderstorm WarningLSX37 min
May 8, 9:37 AM CDTSevere Thunderstorm WarningLSX38 min
May 9, 8:53 AM CDTRiver Flood WarningLSX4 days
May 9, 9:02 AM CDTRiver Flood WarningLSX72 hr
May 13, 1:15 PM CDTMesoscale DiscussionSPC30 min
May 13, 1:52 PM CDTMesoscale DiscussionSPC23 min
May 13, 3:04 PM CDTFlash Flood WatchLSX12 hr
May 13, 9:56 PM CDTSevere Thunderstorm WatchSPC6 hr
May 13, 10:35 PM CDTSevere Thunderstorm WarningLSX40 min
May 13, 11:27 PM CDTMesoscale DiscussionSPC93 min
May 14, 3:51 PM CDTFlash Flood WatchLSX32 hr
May 15, 2:39 PM CDTTornado WatchSPC7 hr
May 17, 9:47 AM CDTRiver Flood WarningLSX4 days
May 25, 12:32 PM CDTMesoscale DiscussionSPC88 min
May 25, 5:31 PM CDTFlash Flood WarningLSX3 hr
May 27, 4:54 PM CDTSevere Thunderstorm WarningLSX39 min
May 27, 5:02 PM CDTFlash Flood WarningLSX4 hr
Jun 2, 11:58 AM CDTMesoscale DiscussionSPC92 min
Jun 2, 12:18 PM CDTSevere Thunderstorm WarningLSX42 min
Jun 2, 12:27 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 7, 12:18 PM CDTMesoscale DiscussionSPC57 min
Jun 8, 3:20 PM CDTMesoscale DiscussionSPC85 min
Jun 9, 4:00 PM CDTFlash Flood WatchLSX12 hr
Jun 10, 12:30 PM CDTMesoscale DiscussionSPC90 min
Jun 10, 5:15 PM CDTTornado WatchSPC7 hr
Jun 10, 7:10 PM CDTMesoscale DiscussionSPC65 min
Jun 10, 8:06 PM CDTSevere Thunderstorm WarningLSX24 min
Jun 10, 8:11 PM CDTSevere Thunderstorm WarningLSX49 min
Jun 10, 8:49 PM CDTFlash Flood WarningLSX6 hr
Jun 10, 8:58 PM CDTMesoscale DiscussionSPC62 min
Jun 15, 6:24 AM CDTMesoscale DiscussionSPC96 min
Jun 15, 8:54 AM CDTAreal Flood AdvisoryLSX4 hr
Jun 15, 9:09 AM CDTFlash Flood WarningLSX6 hr
Jun 15, 3:42 PM CDTFlash Flood WatchLSX20 hr
Jun 16, 12:41 AM CDTSevere Thunderstorm WatchSPC4 hr
Jun 16, 3:53 AM CDTMesoscale DiscussionSPC67 min
Jun 16, 10:26 AM CDTRiver Flood WarningLSX4 days
Jun 16, 11:29 AM CDTRiver Flood WarningLSX4 days
Jun 17, 6:42 PM CDTMesoscale DiscussionSPC2 hr
Jun 17, 7:16 PM CDTTornado WatchSPC4 hr
Jun 17, 8:59 PM CDTSevere Thunderstorm WarningLSX46 min
Jun 17, 9:44 PM CDTSevere Thunderstorm WarningLSX46 min
Jun 18, 2:29 PM CDTRiver Flood WarningLSX20 hr
Jun 19, 7:48 PM CDTMesoscale DiscussionSPC87 min
Jun 21, 2:24 PM CDTHeat AdvisoryLSX6 days
Jun 27, 5:54 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 4, 6:57 AM CDTFlash Flood WarningLSX6 hr
Jul 11, 6:20 PM CDTMesoscale DiscussionSPC115 min
Jul 12, 10:28 AM CDTMesoscale DiscussionSPC92 min
Jul 16, 5:06 PM CDTSevere Thunderstorm WarningLSX39 min
Aug 17, 1:44 PM CDTMesoscale DiscussionSPC2 hr
Aug 19, 3:20 PM CDTFlash Flood WatchLSX13 hr
Aug 19, 11:26 PM CDTSevere Thunderstorm WatchSPC9 hr
Aug 29, 3:47 AM CDTDense Fog AdvisoryLSX5 hr
Sep 6, 9:04 PM CDTDense Fog AdvisoryLSX12 hr
Sep 20, 6:34 AM CDTAreal Flood AdvisoryLSX3 hr
Sep 20, 6:59 AM CDTFlash Flood WarningLSX3 hr
Sep 21, 4:07 AM CDTDense Fog AdvisoryLSX5 hr
Oct 1, 5:12 PM CDTMesoscale DiscussionSPC93 min
Oct 7, 4:18 AM CDTFlash Flood WatchLSX47 hr
Oct 8, 1:09 PM CDTFlash Flood WarningLSX5 hr
Oct 8, 5:26 PM CDTMesoscale DiscussionSPC2 hr
Oct 8, 6:04 PM CDTAreal Flood WarningLSX18 hr
Oct 8, 10:44 PM CDTRiver Flood WarningLSX3 days
Oct 8, 10:44 PM CDTRiver Flood WarningLSX4 days
Oct 8, 10:50 PM CDTAreal Flood WarningLSX12 hr
Oct 9, 12:01 PM CDTAreal Flood WarningLSX7 hr
Oct 9, 7:00 PM CDTAreal Flood WarningLSX18 hr
Oct 9, 8:37 PM CDTRiver Flood WarningLSX14 hr
Oct 17, 4:22 AM CDTFrost AdvisoryLSX29 hr
Oct 17, 3:31 PM CDTFreeze WarningLSX17 hr
Oct 22, 10:06 PM CDTAreal Flood AdvisoryLSX5 hr
Oct 28, 3:58 PM CDTFlash Flood WatchLSX47 hr
Oct 29, 3:58 PM CDTFlash Flood WarningLSX6 hr
Oct 29, 9:39 PM CDTFlash Flood WarningLSX9 hr
Oct 30, 12:38 AM CDTRiver Flood WarningLSX5 days
Oct 30, 1:30 AM CDTRiver Flood WarningLSX4 days
Oct 30, 6:25 AM CDTAreal Flood WarningLSX12 hr
Oct 30, 9:45 AM CDTRiver Flood WarningLSX59 hr
Oct 30, 6:42 PM CDTAreal Flood WarningLSX18 hr
Oct 31, 12:31 PM CDTAreal Flood WarningLSX24 hr
Nov 15, 2:02 PM CSTFlood WatchLSX37 hr
Nov 16, 7:27 PM CSTAreal Flood AdvisoryLSX7 hr
Dec 8, 2:48 PM CSTWind AdvisoryLSX25 hr
Dec 22, 3:39 PM CSTFlood WatchLSX61 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.