Alert archive / Missouri / Ralls County

Weather alerts in Ralls County, Missouri, 2017

91 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Ralls County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts
91
Warnings
33
Watches
15
Advisories
19
Busiest month
March18 alerts
Busiest day
March 7, 20176 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 2 tornado warnings covering Ralls County in 2017 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.

Ralls County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings20100%10%
Severe thunderstorm warnings121017%2100%13 min
Flash flood warnings220%0

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS St. Louis, MO: tornado warnings22959%2654%11 min
NWS St. Louis, MO: severe thunderstorm warnings20413036%48782%22 min
NWS St. Louis, MO: flash flood warnings20955%3397%302 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 2, 5:43 PM CSTDense Fog AdvisoryLSX13 hr
Jan 4, 3:24 AM CSTWinter Weather AdvisoryLSX33 hr
Jan 10, 3:31 AM CSTWind AdvisoryLSX14 hr
Jan 11, 3:31 AM CSTWinter Storm WatchLSX34 hr
Jan 12, 1:49 PM CSTIce Storm WarningLSX70 hr
Jan 14, 2:14 AM CSTMesoscale DiscussionSPC6 hr
Jan 15, 12:03 PM CSTFreezing Rain AdvisoryLSX6 hr
Jan 15, 10:41 PM CSTDense Fog AdvisoryLSX13 hr
Jan 16, 3:33 PM CSTDense Fog AdvisoryLSX7 hr
Jan 19, 3:37 PM CSTDense Fog AdvisoryLSX20 hr
Feb 16, 3:37 AM CSTRed Flag WarningLSX14 hr
Feb 21, 10:42 PM CSTDense Fog AdvisoryLSX10 hr
Feb 28, 12:50 PM CSTWind AdvisoryLSX5 hr
Feb 28, 2:57 PM CSTTornado WatchSPC7 hr
Feb 28, 6:05 PM CSTMesoscale DiscussionSPC115 min
Feb 28, 8:29 PM CSTSevere Thunderstorm WarningLSX33 min
Feb 28, 8:37 PM CSTTornado WarningLSX27 min
Feb 28, 9:04 PM CSTTornado WatchSPC7 hr
Mar 3, 2:06 PM CSTFire Weather WatchLSX14 hr
Mar 6, 3:35 AM CSTWind AdvisoryLSX14 hr
Mar 6, 3:33 PM CSTFire Weather WatchLSX12 hr
Mar 6, 8:22 PM CSTMesoscale DiscussionSPC2 hr
Mar 6, 8:52 PM CSTTornado WatchSPC6 hr
Mar 6, 9:33 PM CSTSevere Thunderstorm WarningLSX57 min
Mar 6, 10:20 PM CSTSevere Thunderstorm WarningLSX55 min
Mar 6, 10:55 PM CSTSevere Thunderstorm WarningLSX50 min
Mar 7, 4:00 AM CSTRed Flag WarningLSX15 hr
Mar 8, 3:30 AM CSTRed Flag WarningLSX15 hr
Mar 9, 3:35 PM CSTFreeze WarningLSX68 hr
Mar 13, 2:04 PM CDTFreeze WarningLSX68 hr
Mar 25, 6:38 PM CDTTornado Warning Tornado observedLSX37 min
Mar 29, 8:34 PM CDTSevere Thunderstorm WarningLSX26 min
Apr 5, 11:24 AM CDTRiver Flood WarningLSX5 days
Apr 26, 3:34 AM CDTSevere Thunderstorm WarningLSX41 min
Apr 27, 4:29 AM CDTFlash Flood WatchLSX4 days
Apr 28, 10:18 PM CDTRiver Flood WarningLSX20 days
Apr 29, 3:08 PM CDTFlash Flood WarningLSX8 hr
Apr 29, 10:59 PM CDTAreal Flood WarningLSX3 hr
Apr 30, 1:57 AM CDTAreal Flood WarningLSX21 hr
Apr 30, 11:00 PM CDTAreal Flood WarningLSX12 hr
May 1, 10:58 AM CDTAreal Flood WarningLSX24 hr
May 10, 3:48 PM CDTMesoscale DiscussionSPC87 min
May 17, 3:20 AM CDTWind AdvisoryLSX16 hr
May 19, 6:04 PM CDTMesoscale DiscussionSPC86 min
May 20, 11:59 AM CDTRiver Flood WarningLSX3 days
May 23, 9:44 PM CDTRiver Flood WarningLSX17 days
Jun 14, 12:40 PM CDTMesoscale DiscussionSPC3 hr
Jun 14, 1:04 PM CDTSevere Thunderstorm WatchSPC9 hr
Jun 14, 5:59 PM CDTSevere Thunderstorm WarningLSX46 min
Jun 14, 6:11 PM CDTMesoscale DiscussionSPC64 min
Jun 14, 6:41 PM CDTSevere Thunderstorm WarningLSX49 min
Jun 14, 7:15 PM CDTAreal Flood AdvisoryLSX3 hr
Jun 14, 8:10 PM CDTSpecial Weather StatementLSX50 min
Jun 14, 8:18 PM CDTSevere Thunderstorm WarningLSX42 min
Jun 14, 9:11 PM CDTSpecial Weather StatementLSX49 min
Jun 15, 12:32 AM CDTFlash Flood WarningLSX8 hr
Jun 16, 2:01 AM CDTSpecial Weather StatementLSX44 min
Jun 16, 11:36 PM CDTSevere Thunderstorm WatchSPC3 hr
Jun 17, 1:29 AM CDTSpecial Weather StatementLSX46 min
Jun 17, 8:17 PM CDTMesoscale DiscussionSPC58 min
Jun 17, 9:50 PM CDTMesoscale DiscussionSPC55 min
Jun 17, 10:29 PM CDTSevere Thunderstorm WarningLSX46 min
Jun 17, 10:53 PM CDTSevere Thunderstorm WatchSPC6 hr
Jul 10, 4:04 AM CDTHeat AdvisoryLSX4 days
Jul 15, 2:30 PM CDTExcessive Heat WatchLSX3 days
Jul 16, 2:06 PM CDTMesoscale DiscussionSPC54 min
Jul 17, 3:00 PM CDTExcessive Heat WarningLSX6 days
Jul 22, 11:48 PM CDTMesoscale DiscussionSPC87 min
Jul 23, 12:38 AM CDTSevere Thunderstorm WatchSPC5 hr
Jul 23, 1:49 AM CDTSevere Thunderstorm WarningLSX41 min
Aug 16, 12:42 PM CDTMesoscale DiscussionSPC3 hr
Aug 16, 2:35 PM CDTMesoscale DiscussionSPC2 hr
Aug 28, 3:47 AM CDTDense Fog AdvisoryLSX7 hr
Sep 18, 11:19 PM CDTDense Fog AdvisoryLSX11 hr
Oct 14, 3:35 PM CDTMesoscale DiscussionSPC2 hr
Oct 14, 5:09 PM CDTTornado WatchSPC8 hr
Oct 14, 6:23 PM CDTMesoscale DiscussionSPC97 min
Oct 14, 8:40 PM CDTSevere Thunderstorm WarningLSX50 min
Oct 14, 10:16 PM CDTSpecial Weather StatementLSX44 min
Oct 27, 3:34 AM CDTFreeze WatchLSX12 hr
Oct 27, 3:09 PM CDTFreeze WarningLSX42 hr
Nov 17, 3:35 PM CSTWind AdvisoryLSX26 hr
Nov 18, 5:29 AM CSTMesoscale DiscussionSPC3 hr
Dec 4, 1:26 PM CSTMesoscale DiscussionSPC94 min
Dec 4, 2:34 PM CSTSevere Thunderstorm WatchSPC5 hr
Dec 4, 3:57 PM CSTMesoscale DiscussionSPC93 min
Dec 4, 6:05 PM CSTMesoscale DiscussionSPC115 min
Dec 23, 4:10 AM CSTWinter Weather AdvisoryLSX34 hr
Dec 29, 3:39 AM CSTWinter Weather AdvisoryLSX23 hr
Dec 29, 3:10 PM CSTWind Chill AdvisoryLSX4 days
Dec 30, 3:56 AM CSTWind Chill WarningLSX3 days

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 archive20162018

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.