Alert archive / Idaho / Twin Falls County

Weather alerts in Twin Falls County, Idaho, 2021

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

Twin Falls County and its neighbors

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

Alerts
106
Warnings
36
Watches
15
Advisories
32
Busiest month
June25 alerts
Busiest day
August 1, 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.

Twin Falls County, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings010%
Flash flood warnings20100%0

Each office's whole area, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Boise, ID: severe thunderstorm warnings15380%4117%23 min
NWS Boise, ID: flash flood warnings10280%4100%77 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 22, 2:24 AM MSTWinter Weather AdvisoryBOI32 hr
Jan 23, 12:32 AM MSTDense Fog AdvisoryBOI13 hr
Jan 27, 5:02 AM MSTWind AdvisoryBOI12 hr
Jan 27, 10:39 AM MSTHigh Wind WarningBOI8 hr
Feb 4, 2:33 PM MSTWind AdvisoryBOI26 hr
Feb 10, 1:26 PM MSTWinter Weather AdvisoryBOI70 hr
Feb 13, 10:59 AM MSTWinter Weather AdvisoryBOI6 hr
Feb 13, 2:09 PM MSTWinter Weather AdvisoryBOI63 hr
Feb 17, 2:25 AM MSTWinter Weather AdvisoryBOI57 hr
Feb 24, 12:30 PM MSTWinter Weather AdvisoryBOI3 days
Mar 27, 2:18 PM MDTWind AdvisoryBOI12 hr
Mar 28, 2:44 AM MDTHigh Wind WarningBOI33 hr
Mar 29, 8:26 AM MDTWind AdvisoryBOI8 hr
Apr 7, 11:35 AM MDTWind AdvisoryBOI32 hr
Apr 9, 1:49 PM MDTWind AdvisoryBOI31 hr
Apr 12, 2:05 AM MDTWind AdvisoryBOI45 hr
Apr 13, 1:10 PM MDTWinter Weather AdvisoryBOI23 hr
Apr 19, 2:34 AM MDTWind AdvisoryBOI15 hr
May 1, 4:28 PM MDTSpecial Weather StatementBOI47 min
May 1, 4:29 PM MDTSpecial Weather StatementBOI46 min
May 14, 4:15 PM MDTSpecial Weather StatementPIH60 min
May 21, 4:26 PM MDTSpecial Weather StatementPIH34 min
May 31, 2:13 PM MDTExcessive Heat WatchBOI24 hr
Jun 1, 2:10 PM MDTHeat AdvisoryBOI55 hr
Jun 4, 7:14 PM MDTSpecial Weather StatementBOI31 min
Jun 4, 7:16 PM MDTSpecial Weather StatementLKN14 min
Jun 4, 8:24 PM MDTSpecial Weather StatementLKN36 min
Jun 4, 8:56 PM MDTSpecial Weather StatementLKN34 min
Jun 4, 8:58 PM MDTSpecial Weather StatementBOI47 min
Jun 9, 3:27 AM MDTRed Flag WarningPIH18 hr
Jun 13, 2:38 AM MDTHeat AdvisoryBOI18 hr
Jun 15, 9:29 AM MDTRed Flag WarningPIH12 hr
Jun 17, 1:18 PM MDTFire Weather WatchPIH24 hr
Jun 18, 7:57 AM MDTFire Weather WatchBOI24 hr
Jun 18, 1:41 PM MDTRed Flag WarningPIH32 hr
Jun 20, 2:31 AM MDTRed Flag WarningPIH16 hr
Jun 22, 10:19 AM MDTHigh Wind WatchBOI10 hr
Jun 22, 1:10 PM MDTFire Weather WatchBOI19 hr
Jun 22, 2:44 PM MDTFire Weather WatchPIH11 hr
Jun 22, 8:36 PM MDTHigh Wind WarningBOI3 hr
Jun 23, 1:49 AM MDTRed Flag WarningPIH17 hr
Jun 23, 8:07 AM MDTRed Flag WarningBOI14 hr
Jun 23, 2:33 PM MDTExcessive Heat WatchBOI24 hr
Jun 23, 7:13 PM MDTRed Flag WarningPIH26 hr
Jun 24, 2:09 PM MDTExcessive Heat WarningBOI13 days
Jun 30, 3:03 AM MDTHeat AdvisoryBOI6 days
Jun 30, 2:07 PM MDTRed Flag WarningBOI33 hr
Jun 30, 2:12 PM MDTRed Flag WarningPIH31 hr
Jul 2, 3:14 AM MDTRed Flag WarningPIH17 hr
Jul 2, 1:33 PM MDTRed Flag WarningBOI33 hr
Jul 4, 2:56 AM MDTRed Flag WarningPIH23 hr
Jul 4, 8:10 AM MDTRed Flag WarningBOI15 hr
Jul 6, 2:28 AM MDTFire Weather WatchPIH35 hr
Jul 7, 1:18 PM MDTRed Flag WarningPIH32 hr
Jul 8, 2:58 AM MDTExcessive Heat WatchBOI12 hr
Jul 8, 2:59 AM MDTRed Flag WarningPIH42 hr
Jul 8, 2:37 PM MDTExcessive Heat WarningBOI4 days
Jul 12, 1:39 PM MDTFire Weather WatchPIH11 hr
Jul 13, 1:05 AM MDTRed Flag WarningPIH21 hr
Jul 17, 3:40 AM MDTHeat AdvisoryBOI41 hr
Jul 17, 2:42 PM MDTFire Weather WatchBOI24 hr
Jul 18, 2:17 AM MDTFire Weather WatchPIH24 hr
Jul 18, 2:23 PM MDTRed Flag WarningBOI57 hr
Jul 19, 1:53 AM MDTRed Flag WarningPIH43 hr
Jul 22, 2:00 AM MDTRed Flag WarningPIH19 hr
Jul 23, 2:18 PM MDTExcessive Heat WatchBOI12 hr
Jul 24, 2:02 AM MDTExcessive Heat WarningBOI70 hr
Jul 29, 2:20 PM MDTFlash Flood WatchBOI3 days
Jul 30, 3:12 PM MDTSpecial Weather StatementLKN48 min
Jul 31, 5:40 PM MDTSpecial Weather StatementLKN50 min
Jul 31, 6:40 PM MDTSpecial Weather StatementBOI35 min
Jul 31, 7:06 PM MDTFlash Flood WarningBOI3 hr
Jul 31, 7:39 PM MDTFlash Flood WarningBOI3 hr
Aug 1, 1:11 PM MDTSpecial Weather StatementBOI49 min
Aug 1, 1:25 PM MDTAreal Flood AdvisoryBOI3 hr
Aug 1, 3:21 PM MDTAreal Flood AdvisoryBOI3 hr
Aug 1, 6:36 PM MDTAreal Flood AdvisoryBOI3 hr
Aug 4, 2:34 PM MDTRed Flag WarningBOI42 hr
Aug 5, 2:41 AM MDTWind AdvisoryBOI27 hr
Aug 5, 2:45 PM MDTMesoscale DiscussionSPC2 hr
Aug 5, 6:03 PM MDTSpecial Weather StatementPIH27 min
Aug 12, 2:04 PM MDTExcessive Heat WarningBOI23 hr
Aug 16, 9:24 PM MDTSpecial Weather StatementBOI36 min
Aug 19, 2:41 PM MDTFire Weather WatchBOI18 hr
Aug 20, 8:25 AM MDTRed Flag WarningBOI40 hr
Aug 20, 9:50 AM MDTRed Flag WarningPIH37 hr
Aug 21, 9:06 PM MDTSpecial Weather StatementBOI39 min
Sep 10, 2:47 AM MDTRed Flag WarningPIH19 hr
Sep 10, 1:02 PM MDTMesoscale DiscussionSPC118 min
Sep 10, 3:27 PM MDTSpecial Weather StatementBOI63 min
Sep 10, 4:32 PM MDTSpecial Weather StatementBOI58 min
Sep 12, 8:47 PM MDTSpecial Weather StatementBOI28 min
Sep 16, 1:24 PM MDTRed Flag WarningBOI56 hr
Sep 16, 1:35 PM MDTRed Flag WarningPIH55 hr
Sep 27, 2:01 PM MDTWind AdvisoryBOI20 hr
Oct 7, 2:15 PM MDTSpecial Weather StatementBOI45 min
Oct 7, 4:07 PM MDTMesoscale DiscussionSPC113 min
Oct 10, 2:34 PM MDTFreeze WarningBOI44 hr
Oct 23, 2:42 AM MDTWind AdvisoryBOI42 hr
Nov 14, 2:10 PM MSTWind AdvisoryBOI45 hr
Dec 12, 2:29 PM MSTWind AdvisoryBOI45 hr
Dec 14, 2:37 PM MSTWinter Weather AdvisoryBOI41 hr
Dec 21, 2:24 PM MSTWinter Weather AdvisoryBOI6 days
Dec 22, 1:48 PM MSTWinter Storm WarningBOI5 days
Dec 23, 3:02 AM MSTWind AdvisoryBOI14 hr
Dec 29, 8:05 PM MSTWinter Weather AdvisoryBOI48 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 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.