Alert archive / Idaho / Lemhi County

Weather alerts in Lemhi County, Idaho, 2018

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

Lemhi County and its neighbors

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

Alerts
72
Warnings
15
Watches
4
Advisories
26
Busiest month
August22 alerts
Busiest day
August 17, 20185 alerts

Over time

By month

Warning verification

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

Lemhi County, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings110%2100%19 min
Flash flood warnings00

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Missoula, MT: severe thunderstorm warnings11918%1776%18 min
NWS Missoula, MT: flash flood warnings10100%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 5, 12:58 PM MSTWinter Weather AdvisoryMSO22 hr
Jan 10, 2:16 PM MSTWinter Weather AdvisoryMSO42 hr
Jan 17, 1:59 PM MSTWinter Weather AdvisoryMSO45 hr
Feb 16, 2:53 PM MSTWinter Weather AdvisoryMSO69 hr
Feb 22, 7:39 AM MSTWinter Weather AdvisoryMSO15 hr
Feb 22, 11:03 PM MSTWinter Weather AdvisoryMSO10 hr
Feb 24, 6:50 PM MSTWinter Weather AdvisoryMSO44 hr
Mar 1, 3:11 AM MSTWinter Weather AdvisoryMSO48 hr
Mar 2, 8:08 AM MSTWinter Storm WarningMSO2 hr
Mar 2, 8:08 AM MSTWinter Weather AdvisoryMSO14 hr
Mar 3, 2:05 PM MSTWinter Weather AdvisoryMSO24 hr
Mar 16, 3:17 AM MDTWinter Weather AdvisoryMSO57 hr
Mar 24, 5:52 AM MDTWinter Weather AdvisoryMSO3 hr
Apr 11, 12:48 PM MDTWinter Weather AdvisoryMSO29 hr
Apr 29, 2:30 PM MDTWinter Weather AdvisoryMSO20 hr
May 6, 2:50 PM MDTMesoscale DiscussionSPC2 hr
May 6, 3:21 PM MDTSpecial Weather StatementMSO24 min
May 11, 2:28 PM MDTWinter Weather AdvisoryMSO19 hr
May 20, 1:41 PM MDTSpecial Weather StatementMSO34 min
May 22, 3:22 PM MDTAreal Flood AdvisoryMSO113 min
May 25, 4:50 PM MDTAreal Flood AdvisoryMSO3 hr
May 26, 12:07 PM MDTMesoscale DiscussionSPC2 hr
May 26, 1:18 PM MDTSpecial Weather StatementMSO42 min
May 26, 2:31 PM MDTSpecial Weather StatementMSO44 min
May 26, 3:09 PM MDTSevere Thunderstorm WarningMSO36 min
May 30, 1:38 PM MDTSpecial Weather StatementMSO37 min
May 30, 1:48 PM MDTMesoscale DiscussionSPC117 min
May 31, 12:33 PM MDTMesoscale DiscussionSPC117 min
Jun 7, 1:20 PM MDTMesoscale DiscussionSPC85 min
Jun 8, 2:18 PM MDTWind AdvisoryMSO31 hr
Jun 9, 11:54 AM MDTWinter Weather AdvisoryMSO48 hr
Jun 11, 1:15 PM MDTFrost AdvisoryMSO19 hr
Jun 28, 2:56 PM MDTSpecial Weather StatementMSO34 min
Jun 28, 3:04 PM MDTSpecial Weather StatementMSO26 min
Jul 10, 3:48 AM MDTRed Flag WarningPIH17 hr
Jul 16, 4:15 PM MDTSpecial Weather StatementMSO45 min
Jul 16, 5:55 PM MDTSpecial Weather StatementMSO50 min
Jul 16, 8:42 PM MDTSpecial Weather StatementMSO48 min
Jul 31, 2:51 PM MDTRed Flag WarningPIH30 hr
Jul 31, 8:19 PM MDTSpecial Weather StatementMSO41 min
Aug 1, 3:51 PM MDTSpecial Weather StatementMSO39 min
Aug 1, 4:35 PM MDTSpecial Weather StatementMSO40 min
Aug 1, 5:03 PM MDTSpecial Weather StatementMSO27 min
Aug 1, 9:19 PM MDTRed Flag WarningPIH24 hr
Aug 2, 9:41 PM MDTRed Flag WarningPIH24 hr
Aug 5, 6:02 AM MDTSpecial Weather StatementPIH58 min
Aug 8, 1:55 PM MDTFire Weather WatchPIH24 hr
Aug 9, 2:14 PM MDTRed Flag WarningPIH3 days
Aug 15, 2:03 PM MDTFire Weather WatchPIH24 hr
Aug 16, 3:39 AM MDTRed Flag WarningPIH48 hr
Aug 17, 12:24 PM MDTSpecial Weather StatementMSO51 min
Aug 17, 1:08 PM MDTSpecial Weather StatementMSO37 min
Aug 17, 1:41 PM MDTMesoscale DiscussionSPC2 hr
Aug 17, 2:16 PM MDTSpecial Weather StatementPIH44 min
Aug 17, 2:44 PM MDTSpecial Weather StatementMSO46 min
Aug 19, 1:52 PM MDTRed Flag WarningPIH30 hr
Aug 20, 1:55 PM MDTSpecial Weather StatementMSO35 min
Aug 20, 4:38 PM MDTMesoscale DiscussionSPC2 hr
Aug 22, 3:38 AM MDTRed Flag WarningPIH17 hr
Aug 23, 1:48 AM MDTFire Weather WatchPIH11 hr
Aug 23, 1:04 PM MDTRed Flag WarningPIH56 hr
Sep 6, 2:58 AM MDTRed Flag WarningPIH16 hr
Sep 9, 1:37 PM MDTRed Flag WarningPIH31 hr
Sep 15, 2:08 PM MDTRed Flag WarningPIH31 hr
Sep 20, 12:48 PM MDTFire Weather WatchPIH23 hr
Sep 21, 11:40 AM MDTRed Flag WarningPIH32 hr
Oct 9, 3:48 AM MDTWinter Weather AdvisoryMSO29 hr
Nov 21, 2:47 PM MSTWinter Weather AdvisoryMSO69 hr
Dec 10, 2:42 PM MSTWinter Weather AdvisoryMSO50 hr
Dec 17, 2:37 PM MSTWinter Weather AdvisoryMSO44 hr
Dec 20, 2:39 PM MSTWinter Weather AdvisoryMSO20 hr
Dec 29, 2:11 PM MSTWinter Weather AdvisoryMSO39 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.