Alert archive / South Dakota / Tripp County

Weather alerts in Tripp County, South Dakota, 2021

104 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Tripp County and its neighbors

Each county as a circle sized by its count in 2021. Tap one for its archive.

Alerts
104
Warnings
30
Watches
18
Advisories
21
Busiest month
August27 alerts
Busiest day
August 31, 20216 alerts

Over time

By month

Warning verification

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

Tripp County, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings9811%1070%33 min
Flash flood warnings10100%0

Each office's whole area, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Rapid City, SD: tornado warnings5340%786%22 min
NWS Rapid City, SD: severe thunderstorm warnings21217119%38079%26 min
NWS Rapid City, SD: flash flood warnings20100%0

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 6, 8:40 PM CSTDense Fog AdvisoryUNR13 hr
Jan 11, 2:23 PM CSTHigh Wind WatchUNR37 hr
Jan 13, 3:14 AM CSTHigh Wind WarningUNR58 hr
Jan 29, 9:49 PM CSTDense Fog AdvisoryUNR14 hr
Feb 2, 6:55 PM CSTDense Fog AdvisoryUNR16 hr
Feb 9, 2:32 PM CSTWind Chill AdvisoryUNR4 days
Feb 11, 2:50 PM CSTWind Chill WarningUNR5 days
Feb 21, 2:41 PM CSTWind AdvisoryUNR27 hr
Feb 26, 3:00 PM CSTWinter Weather AdvisoryUNR39 hr
Mar 5, 3:20 AM CSTFire Weather WatchUNR11 hr
Mar 5, 1:59 PM CSTRed Flag WarningUNR30 hr
Mar 9, 3:08 AM CSTWinter Weather AdvisoryUNR41 hr
Mar 12, 2:44 PM CSTWinter Storm WarningUNR66 hr
Mar 13, 3:26 AM CSTWinter Weather AdvisoryUNR47 hr
Mar 14, 12:40 PM CDTMesoscale DiscussionSPC4 hr
Mar 14, 6:20 PM CDTMesoscale DiscussionSPC6 hr
Mar 27, 2:56 PM CDTRed Flag WarningUNR3 days
Mar 27, 2:56 PM CDTHigh Wind WatchUNR24 hr
Mar 28, 3:23 AM CDTHigh Wind WarningUNR46 hr
Mar 28, 3:32 AM CDTFire Weather WatchUNR11 hr
Mar 29, 3:45 PM CDTWind AdvisoryUNR29 hr
Mar 31, 4:01 AM CDTFire Weather WatchUNR11 hr
Mar 31, 2:37 PM CDTRed Flag WarningUNR53 hr
Apr 3, 3:34 AM CDTRed Flag WarningUNR16 hr
Apr 5, 4:13 AM CDTRed Flag WarningUNR16 hr
Apr 10, 3:27 PM CDTWind AdvisoryUNR3 days
May 21, 4:52 AM CDTSpecial Weather StatementUNR38 min
May 23, 8:12 PM CDTSevere Thunderstorm WatchSPC5 hr
May 23, 9:49 PM CDTSpecial Weather StatementUNR26 min
May 23, 9:56 PM CDTMesoscale DiscussionSPC2 hr
May 23, 9:58 PM CDTSevere Thunderstorm WarningUNR47 min
Jun 10, 4:35 AM CDTHeat AdvisoryUNR15 hr
Jun 10, 8:28 PM CDTMesoscale DiscussionSPC92 min
Jun 10, 9:08 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 11, 2:14 AM CDTSevere Thunderstorm WarningUNR91 min
Jun 14, 1:07 AM CDTSpecial Weather StatementUNR53 min
Jun 14, 1:48 AM CDTSpecial Weather StatementUNR57 min
Jun 16, 3:22 AM CDTHeat AdvisoryUNR15 hr
Jun 23, 6:58 PM CDTSevere Thunderstorm WarningUNR32 min
Jun 23, 8:30 PM CDTSevere Thunderstorm WarningUNR31 min
Jul 3, 6:33 PM CDTMesoscale DiscussionSPC87 min
Jul 3, 10:54 PM CDTSpecial Weather StatementUNR36 min
Jul 5, 1:34 PM CDTMesoscale DiscussionSPC116 min
Jul 9, 12:56 AM CDTSpecial Weather StatementUNR49 min
Jul 23, 9:22 PM CDTSpecial Weather StatementUNR68 min
Jul 26, 3:03 AM CDTHeat AdvisoryUNR66 hr
Jul 31, 5:23 AM CDTDense Fog AdvisoryUNR5 hr
Aug 6, 7:21 PM CDTSevere Thunderstorm WatchSPC6 hr
Aug 6, 9:09 PM CDTMesoscale DiscussionSPC2 hr
Aug 6, 9:30 PM CDTSevere Thunderstorm WarningUNR75 min
Aug 6, 10:42 PM CDTSevere Thunderstorm WarningUNR34 min
Aug 16, 2:41 PM CDTFire Weather WatchUNR13 hr
Aug 16, 2:41 PM CDTRed Flag WarningUNR30 hr
Aug 19, 10:33 PM CDTSpecial Weather StatementUNR27 min
Aug 22, 6:21 AM CDTSpecial Weather StatementUNR84 min
Aug 22, 7:43 AM CDTSpecial Weather StatementUNR92 min
Aug 22, 3:38 PM CDTMesoscale DiscussionSPC97 min
Aug 23, 2:56 PM CDTMesoscale DiscussionSPC2 hr
Aug 23, 5:20 PM CDTSevere Thunderstorm WatchSPC8 hr
Aug 23, 7:38 PM CDTMesoscale DiscussionSPC2 hr
Aug 23, 7:43 PM CDTSpecial Weather StatementUNR47 min
Aug 23, 9:37 PM CDTMesoscale DiscussionSPC113 min
Aug 26, 7:25 PM CDTMesoscale DiscussionSPC2 hr
Aug 26, 8:03 PM CDTSevere Thunderstorm WatchSPC7 hr
Aug 27, 1:42 AM CDTSpecial Weather StatementUNR48 min
Aug 28, 4:00 AM CDTSpecial Weather StatementUNR60 min
Aug 28, 8:00 AM CDTSpecial Weather StatementUNR60 min
Aug 28, 9:01 AM CDTSpecial Weather StatementUNR29 min
Aug 30, 7:25 PM CDTMesoscale DiscussionSPC3 hr
Aug 30, 9:57 PM CDTSevere Thunderstorm WatchSPC7 hr
Aug 30, 11:02 PM CDTSpecial Weather StatementUNR58 min
Aug 31, 1:02 AM CDTSevere Thunderstorm WarningUNR58 min
Aug 31, 1:19 AM CDTSevere Thunderstorm WarningUNR56 min
Aug 31, 1:57 AM CDTSevere Thunderstorm WarningUNR63 min
Sep 1, 6:26 PM CDTSevere Thunderstorm WatchSPC7 hr
Sep 1, 9:20 PM CDTMesoscale DiscussionSPC85 min
Sep 1, 11:36 PM CDTMesoscale DiscussionSPC84 min
Sep 2, 12:48 AM CDTAreal Flood AdvisoryUNR6 hr
Sep 2, 4:00 AM CDTFlash Flood WarningUNR3 hr
Sep 16, 8:16 PM CDTSevere Thunderstorm WatchSPC6 hr
Sep 16, 9:14 PM CDTSpecial Weather StatementUNR31 min
Sep 16, 9:35 PM CDTSpecial Weather StatementUNR25 min
Oct 12, 3:03 PM CDTHigh Wind WarningUNR29 hr
Oct 12, 3:03 PM CDTWind AdvisoryUNR28 hr
Oct 13, 3:45 PM CDTFreeze WarningUNR18 hr
Oct 28, 9:55 AM CDTWind AdvisoryUNR7 hr
Nov 10, 9:03 AM CSTHigh Wind WatchUNR5 hr
Nov 10, 9:03 AM CSTHigh Wind WarningUNR39 hr
Nov 11, 9:57 PM CSTWind AdvisoryUNR16 hr
Nov 13, 3:05 AM CSTHigh Wind WarningUNR18 hr
Nov 13, 3:05 AM CSTWind AdvisoryUNR18 hr
Nov 16, 3:41 PM CSTWind AdvisoryUNR26 hr
Nov 22, 2:05 AM CSTFire Weather WatchUNR12 hr
Nov 22, 2:25 PM CSTRed Flag WarningUNR28 hr
Dec 4, 3:00 AM CSTHigh Wind WatchUNR12 hr
Dec 4, 3:04 PM CSTHigh Wind WarningUNR27 hr
Dec 7, 2:54 PM CSTWinter Storm WatchUNR36 hr
Dec 9, 3:10 AM CSTWinter Storm WarningUNR39 hr
Dec 10, 2:39 AM CSTMesoscale DiscussionSPC4 hr
Dec 10, 9:10 AM CSTMesoscale DiscussionSPC4 hr
Dec 14, 3:33 AM CSTHigh Wind WarningUNR42 hr
Dec 14, 2:45 PM CSTWinter Weather AdvisoryUNR30 hr
Dec 15, 4:00 PM CSTSnow Squall WarningUNR60 min
Dec 15, 5:01 PM CSTSnow Squall WarningUNR44 min

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 archive20202022

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.