Alert archive / Idaho / Twin Falls County

Weather alerts in Twin Falls County, Idaho, 2017

75 weather alerts in 2017, 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 2017. Tap one for its archive.

Alerts
75
Warnings
30
Watches
12
Advisories
23
Busiest month
August14 alerts
Busiest day
July 9, 20174 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, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings3167%40%
Flash flood warnings00

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Boise, ID: severe thunderstorm warnings23387%447%17 min
NWS Boise, ID: flash flood warnings80100%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, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeLasted
Jan 2, 2:31 PM MSTWinter Storm WatchBOI317 days
Jan 3, 4:23 AM MSTWinter Storm WarningBOI43 hr
Jan 3, 4:23 AM MSTWinter Weather AdvisoryBOI11 hr
Jan 5, 1:34 PM MSTWind Chill WarningBOI21 hr
Jan 6, 2:24 PM MSTWind Chill WarningBOI19 hr
Jan 6, 2:24 PM MSTWinter Storm WarningBOI43 hr
Jan 7, 2:30 PM MSTWinter Weather AdvisoryBOI27 hr
Jan 16, 3:00 PM MSTWinter Storm WatchBOI25 hr
Jan 17, 4:49 AM MSTWinter Storm WarningBOI54 hr
Jan 17, 4:49 AM MSTWinter Weather AdvisoryBOI54 hr
Jan 22, 2:53 PM MSTWinter Weather AdvisoryBOI27 hr
Jan 23, 2:35 PM MSTWinter Storm WarningBOI7 hr
Jan 25, 5:31 AM MSTDense Fog AdvisoryBOI4 hr
Feb 6, 2:56 PM MSTWinter Weather AdvisoryBOI26 hr
Feb 6, 3:27 PM MSTAreal Flood AdvisoryBOI24 hr
Feb 7, 3:53 PM MSTAreal Flood AdvisoryBOI24 hr
Feb 8, 11:04 AM MSTAreal Flood AdvisoryBOI57 hr
Feb 9, 5:04 AM MSTAreal Flood WarningBOI24 hr
Feb 10, 4:38 AM MSTAreal Flood WarningBOI36 hr
Feb 20, 3:02 AM MSTWind AdvisoryBOI41 hr
Feb 22, 2:53 AM MSTWinter Weather AdvisoryBOI35 hr
Feb 22, 3:05 PM MSTWinter Storm WarningBOI38 hr
Mar 28, 1:49 PM MDTWind AdvisoryBOI58 hr
Mar 29, 4:10 AM MDTWinter Weather AdvisoryBOI48 hr
Mar 29, 11:54 AM MDTHigh Wind WarningBOI36 hr
Mar 29, 3:42 PM MDTFlood WatchBOI35 hr
Apr 26, 2:28 PM MDTWind AdvisoryBOI31 hr
May 5, 5:54 PM MDTSevere Thunderstorm WarningBOI27 min
May 7, 12:56 PM MDTFlood WatchBOI12 hr
May 12, 4:39 PM MDTHigh Wind WarningBOI3 hr
May 15, 3:04 PM MDTWinter Weather AdvisoryBOI24 hr
Jun 1, 4:58 PM MDTSpecial Weather StatementBOI47 min
Jun 4, 7:13 PM MDTSevere Thunderstorm WarningBOI47 min
Jun 4, 7:46 PM MDTSevere Thunderstorm WarningBOI44 min
Jun 11, 5:53 PM MDTSpecial Weather StatementBOI52 min
Jun 11, 6:39 PM MDTSpecial Weather StatementBOI51 min
Jun 22, 12:44 PM MDTRed Flag WarningBOI8 hr
Jul 9, 2:23 PM MDTSpecial Weather StatementLKN37 min
Jul 9, 2:49 PM MDTSpecial Weather StatementBOI26 min
Jul 9, 3:38 PM MDTSpecial Weather StatementBOI52 min
Jul 9, 5:00 PM MDTSpecial Weather StatementBOI45 min
Jul 13, 1:46 PM MDTFire Weather WatchBOI25 hr
Jul 14, 3:06 PM MDTRed Flag WarningBOI33 hr
Jul 14, 3:51 PM MDTRed Flag WarningPIH29 hr
Jul 22, 3:08 PM MDTFire Weather WatchBOI24 hr
Jul 23, 2:21 PM MDTRed Flag WarningPIH30 hr
Jul 23, 3:10 PM MDTRed Flag WarningBOI33 hr
Jul 24, 2:11 PM MDTFlash Flood WatchBOI34 hr
Jul 26, 2:26 PM MDTSpecial Weather StatementLKN49 min
Jul 29, 3:19 PM MDTSpecial Weather StatementBOI56 min
Aug 2, 5:44 PM MDTSpecial Weather StatementBOI91 min
Aug 3, 2:02 PM MDTFire Weather WatchPIH13 hr
Aug 4, 3:28 AM MDTRed Flag WarningPIH18 hr
Aug 7, 8:42 AM MDTRed Flag WarningBOI13 hr
Aug 8, 2:21 PM MDTFire Weather WatchBOI18 hr
Aug 9, 8:13 AM MDTRed Flag WarningBOI13 hr
Aug 10, 8:29 AM MDTRed Flag WarningBOI14 hr
Aug 11, 8:23 AM MDTRed Flag WarningBOI14 hr
Aug 21, 3:09 PM MDTFire Weather WatchBOI23 hr
Aug 22, 2:32 PM MDTRed Flag WarningBOI33 hr
Aug 29, 8:29 AM MDTFire Weather WatchBOI24 hr
Aug 29, 1:37 PM MDTFire Weather WatchPIH14 hr
Aug 30, 3:54 AM MDTRed Flag WarningPIH23 hr
Aug 30, 8:26 AM MDTRed Flag WarningBOI17 hr
Sep 14, 8:14 AM MDTRed Flag WarningBOI10 hr
Oct 2, 1:57 PM MDTFreeze WarningBOI20 hr
Dec 3, 4:15 AM MSTWind AdvisoryBOI22 hr
Dec 11, 6:53 AM MSTDense Fog AdvisoryBOI4 hr
Dec 12, 1:10 AM MSTDense Fog AdvisoryBOI12 hr
Dec 12, 1:59 PM MSTDense Fog AdvisoryBOI21 hr
Dec 18, 2:36 PM MSTWinter Weather AdvisoryBOI44 hr
Dec 22, 11:02 AM MSTWinter Weather AdvisoryBOI27 hr
Dec 23, 7:33 AM MSTWinter Storm WarningBOI3 hr
Dec 23, 2:58 PM MSTWinter Weather AdvisoryBOI43 hr
Dec 29, 9:01 PM MSTWinter Weather AdvisoryBOI13 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 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.