Alert archive / South Dakota / Fall River County

Weather alerts in Fall River County, South Dakota, 2018

134 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Fall River County and its neighbors

Each county as a circle sized by its count in 2018. Tap one for its archive.

Alerts
134
Warnings
40
Watches
24
Advisories
15
Busiest month
May39 alerts
Busiest day
May 23, 20187 alerts

Over time

By month

Warning verification

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

Fall River County, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings241825%2181%17 min
Flash flood warnings20100%0

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Rapid City, SD: tornado warnings18667%1464%18 min
NWS Rapid City, SD: severe thunderstorm warnings37627327%58684%24 min
NWS Rapid City, SD: flash flood warnings13838%1669%42 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, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeLasted
Jan 10, 3:31 PM MSTSpecial Weather StatementUNR119 min
Jan 19, 2:57 AM MSTWinter Storm WatchUNR24 hr
Jan 20, 2:53 AM MSTWinter Storm WarningUNR48 hr
Feb 3, 3:52 AM MSTWinter Storm WarningUNR27 hr
Feb 3, 3:52 AM MSTWinter Weather AdvisoryUNR25 hr
Feb 7, 2:42 PM MSTWinter Weather AdvisoryUNR49 hr
Feb 9, 3:04 PM MSTWind Chill AdvisoryUNR18 hr
Feb 16, 2:11 PM MSTWinter Storm WatchUNR48 hr
Feb 17, 1:55 PM MSTWinter Storm WarningUNR64 hr
Feb 20, 1:45 PM MSTWind Chill AdvisoryUNR19 hr
Mar 3, 1:18 PM MSTDense Fog AdvisoryUNR22 hr
Mar 4, 3:22 AM MSTHigh Wind WarningUNR41 hr
Mar 14, 1:52 AM MDTWinter Storm WatchUNR37 hr
Mar 15, 3:21 AM MDTWinter Storm WarningUNR39 hr
Mar 16, 3:04 AM MDTMesoscale DiscussionSPC4 hr
Apr 5, 2:49 AM MDTWinter Storm WarningUNR33 hr
Apr 5, 2:49 AM MDTWinter Weather AdvisoryUNR33 hr
Apr 10, 2:45 PM MDTWinter Storm WatchUNR44 hr
Apr 12, 3:16 AM MDTWinter Storm WarningUNR35 hr
Apr 13, 2:27 PM MDTWinter Weather AdvisoryUNR4 hr
May 14, 3:54 PM MDTSevere Thunderstorm WarningUNR66 min
May 14, 5:24 PM MDTSevere Thunderstorm WarningUNR81 min
May 17, 12:58 PM MDTMesoscale DiscussionSPC92 min
May 17, 1:23 PM MDTSevere Thunderstorm WatchSPC10 hr
May 17, 2:40 PM MDTSevere Thunderstorm WarningUNR65 min
May 17, 3:06 PM MDTFlash Flood WarningUNR5 hr
May 17, 3:38 PM MDTSevere Thunderstorm WarningUNR67 min
May 17, 4:54 PM MDTMesoscale DiscussionSPC66 min
May 17, 6:03 PM MDTSpecial Weather StatementCYS42 min
May 17, 6:47 PM MDTMesoscale DiscussionSPC58 min
May 17, 7:11 PM MDTMesoscale DiscussionSPC64 min
May 17, 7:56 PM MDTFlash Flood WarningUNR102 min
May 18, 1:50 PM MDTMesoscale DiscussionSPC115 min
May 18, 5:04 PM MDTMesoscale DiscussionSPC86 min
May 22, 4:56 PM MDTMesoscale DiscussionSPC2 hr
May 22, 5:52 PM MDTSevere Thunderstorm WarningUNR53 min
May 22, 10:09 PM MDTSpecial Weather StatementUNR51 min
May 22, 10:22 PM MDTSevere Thunderstorm WarningUNR21 min
May 23, 1:00 PM MDTMesoscale DiscussionSPC2 hr
May 23, 1:31 PM MDTSevere Thunderstorm WatchSPC7 hr
May 23, 4:06 PM MDTSevere Thunderstorm WarningUNR42 min
May 23, 5:07 PM MDTMesoscale DiscussionSPC83 min
May 23, 5:14 PM MDTSpecial Weather StatementUNR31 min
May 23, 7:28 PM MDTMesoscale DiscussionSPC92 min
May 27, 3:44 AM MDTFlash Flood WatchUNR23 hr
May 27, 4:42 PM MDTMesoscale DiscussionSPC93 min
May 27, 5:06 PM MDTMesoscale DiscussionSPC84 min
May 27, 5:27 PM MDTSevere Thunderstorm WatchSPC6 hr
May 27, 7:31 PM MDTMesoscale DiscussionSPC119 min
May 27, 7:56 PM MDTSpecial Weather StatementUNR49 min
May 27, 8:19 PM MDTSevere Thunderstorm WarningUNR56 min
May 27, 9:11 PM MDTSevere Thunderstorm WarningUNR64 min
May 28, 3:34 AM MDTFlash Flood WatchUNR24 hr
May 28, 7:58 PM MDTSpecial Weather StatementUNR47 min
May 28, 8:52 PM MDTSpecial Weather StatementUNR23 min
May 28, 9:55 PM MDTAreal Flood WarningUNR7 hr
May 29, 3:04 AM MDTFlash Flood WatchUNR21 hr
May 29, 9:48 AM MDTAreal Flood WarningUNR3 hr
May 29, 12:01 PM MDTAreal Flood WarningUNR48 hr
Jun 5, 4:32 PM MDTSpecial Weather StatementUNR28 min
Jun 5, 4:48 PM MDTSpecial Weather StatementUNR27 min
Jun 5, 4:54 PM MDTSevere Thunderstorm WarningUNR51 min
Jun 5, 5:43 PM MDTSevere Thunderstorm WarningUNR47 min
Jun 5, 5:54 PM MDTMesoscale DiscussionSPC2 hr
Jun 7, 1:51 PM MDTMesoscale DiscussionSPC84 min
Jun 7, 3:49 PM MDTSevere Thunderstorm WatchSPC9 hr
Jun 7, 8:06 PM MDTSevere Thunderstorm WarningUNR24 min
Jun 8, 1:01 PM MDTMesoscale DiscussionSPC119 min
Jun 8, 1:39 PM MDTSevere Thunderstorm WatchSPC8 hr
Jun 9, 2:50 PM MDTMesoscale DiscussionSPC2 hr
Jun 16, 2:37 PM MDTFlash Flood WatchUNR15 hr
Jun 18, 1:46 PM MDTFlash Flood WatchUNR51 hr
Jun 22, 12:56 PM MDTMesoscale DiscussionSPC94 min
Jun 22, 2:12 PM MDTFlood WatchUNR54 hr
Jun 23, 4:14 PM MDTMesoscale DiscussionSPC61 min
Jun 29, 1:06 PM MDTSevere Thunderstorm WatchSPC9 hr
Jun 29, 2:29 PM MDTMesoscale DiscussionSPC91 min
Jun 29, 6:14 PM MDTSevere Thunderstorm WarningUNR61 min
Jun 29, 6:25 PM MDTSevere Thunderstorm WarningUNR50 min
Jun 29, 6:45 PM MDTSpecial Weather StatementCYS45 min
Jun 29, 7:13 PM MDTSevere Thunderstorm WarningUNR62 min
Jun 29, 8:02 PM MDTSpecial Weather StatementUNR28 min
Jul 3, 4:42 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 3, 6:01 PM MDTSevere Thunderstorm WarningUNR59 min
Jul 3, 8:38 PM MDTMesoscale DiscussionSPC2 hr
Jul 6, 2:00 PM MDTHeat AdvisoryUNR53 hr
Jul 9, 6:22 PM MDTMesoscale DiscussionSPC113 min
Jul 16, 2:52 PM MDTMesoscale DiscussionSPC113 min
Jul 17, 3:02 AM MDTFlash Flood WatchUNR20 hr
Jul 17, 2:47 PM MDTMesoscale DiscussionSPC118 min
Jul 17, 3:09 PM MDTSevere Thunderstorm WatchSPC10 hr
Jul 17, 5:49 PM MDTMesoscale DiscussionSPC116 min
Jul 17, 8:59 PM MDTSpecial Weather StatementUNR46 min
Jul 17, 9:13 PM MDTSevere Thunderstorm WarningUNR44 min
Jul 17, 9:56 PM MDTSpecial Weather StatementUNR49 min
Jul 20, 1:31 PM MDTFlash Flood WatchUNR35 hr
Jul 21, 12:50 PM MDTMesoscale DiscussionSPC2 hr
Jul 21, 4:11 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 21, 8:40 PM MDTMesoscale DiscussionSPC65 min
Jul 24, 3:44 PM MDTMesoscale DiscussionSPC2 hr
Jul 25, 2:57 AM MDTSpecial Weather StatementUNR48 min
Jul 27, 4:55 PM MDTMesoscale DiscussionSPC2 hr
Jul 27, 6:27 PM MDTSevere Thunderstorm WarningUNR48 min
Jul 27, 6:48 PM MDTSevere Thunderstorm WarningUNR57 min
Jul 28, 2:17 PM MDTMesoscale DiscussionSPC88 min
Jul 28, 2:34 PM MDTTornado WatchSPC7 hr
Jul 28, 6:38 PM MDTMesoscale DiscussionSPC97 min
Jul 29, 12:46 PM MDTMesoscale DiscussionSPC59 min
Jul 29, 1:24 PM MDTSevere Thunderstorm WarningUNR27 min
Jul 29, 1:34 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 29, 2:30 PM MDTSevere Thunderstorm WarningUNR32 min
Jul 29, 4:07 PM MDTMesoscale DiscussionSPC53 min
Jul 29, 6:02 PM MDTSevere Thunderstorm WarningUNR28 min
Aug 6, 5:51 PM MDTSpecial Weather StatementUNR39 min
Aug 15, 6:16 AM MDTSpecial Weather StatementUNR29 min
Aug 15, 6:54 AM MDTSevere Thunderstorm WarningUNR66 min
Aug 15, 8:03 AM MDTMesoscale DiscussionSPC2 hr
Aug 15, 3:20 PM MDTSpecial Weather StatementUNR25 min
Aug 15, 3:27 PM MDTSevere Thunderstorm WarningUNR28 min
Aug 15, 4:24 PM MDTSpecial Weather StatementUNR36 min
Aug 23, 2:32 PM MDTMesoscale DiscussionSPC118 min
Sep 8, 4:07 PM MDTMesoscale DiscussionSPC2 hr
Sep 25, 1:32 PM MDTFrost AdvisoryUNR18 hr
Sep 25, 1:32 PM MDTFreeze WarningUNR18 hr
Oct 13, 8:16 AM MDTWinter Weather AdvisoryUNR18 hr
Oct 13, 7:53 PM MDTWinter Storm WarningUNR6 hr
Nov 2, 2:39 PM MDTWind AdvisoryUNR23 hr
Nov 16, 8:40 PM MSTWinter Weather AdvisoryUNR8 hr
Nov 23, 2:25 PM MSTWinter Weather AdvisoryUNR36 hr
Nov 28, 1:36 PM MSTWinter Storm WatchUNR38 hr
Nov 29, 2:01 PM MSTWinter Storm WarningUNR66 hr
Nov 30, 3:24 AM MSTWinter Weather AdvisoryUNR48 hr
Dec 29, 2:19 PM MSTWinter Weather AdvisoryUNR51 hr
Dec 30, 3:10 AM MSTWinter Storm WarningUNR35 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 archive20172019

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.