Alert archive / Idaho / Gem County

Weather alerts in Gem County, Idaho, 2024

101 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Gem County and its neighbors

Each county as a circle sized by its count in 2024. Tap one for its archive.

Alerts
101
Warnings
29
Watches
20
Advisories
38
Busiest month
January17 alerts
Busiest day
June 26, 20246 alerts

Over time

By month

Warning verification

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

Gem County, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings8538%3100%8 min
Flash flood warnings10100%0

Each office's whole area, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Boise, ID: severe thunderstorm warnings45980%4639%24 min
NWS Boise, ID: flash flood warnings70100%30%

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 1, 9:37 AM MSTDense Fog AdvisoryBOI3 hr
Jan 1, 2:07 PM MSTDense Fog AdvisoryBOI21 hr
Jan 4, 4:41 AM MSTDense Fog AdvisoryBOI6 hr
Jan 6, 2:21 PM MSTWinter Storm WatchBOI28 hr
Jan 6, 4:01 PM MSTSpecial Weather StatementBOI119 min
Jan 7, 6:17 PM MSTWinter Storm WarningBOI65 hr
Jan 10, 2:37 PM MSTWinter Storm WatchBOI15 hr
Jan 10, 2:37 PM MSTWinter Storm WarningBOI4 days
Jan 12, 2:08 PM MSTWinter Weather AdvisoryBOI39 hr
Jan 15, 1:50 PM MSTWinter Weather AdvisoryBOI4 days
Jan 16, 3:41 AM MSTWinter Storm WarningBOI43 hr
Jan 17, 12:49 PM MSTMesoscale DiscussionSPC4 hr
Jan 23, 6:36 AM MSTDense Fog AdvisoryBOI6 hr
Jan 23, 4:34 PM MSTDense Fog AdvisoryBOI15 hr
Jan 24, 8:21 AM MSTDense Fog AdvisoryBOI3 hr
Jan 25, 8:27 PM MSTDense Fog AdvisoryBOI16 hr
Jan 28, 10:51 PM MSTDense Fog AdvisoryBOI15 hr
Feb 7, 8:15 PM MSTWinter Weather AdvisoryBOI15 hr
Feb 13, 2:20 PM MSTWinter Weather AdvisoryBOI63 hr
Feb 23, 2:01 PM MSTWinter Storm WatchBOI24 hr
Feb 23, 2:05 PM MSTWind AdvisoryBOI24 hr
Feb 24, 2:06 PM MSTWinter Weather AdvisoryBOI54 hr
Feb 28, 2:48 AM MSTWinter Weather AdvisoryBOI4 days
Feb 28, 2:53 AM MSTHigh Wind WarningBOI41 hr
Feb 28, 2:53 AM MSTWind AdvisoryBOI41 hr
Mar 2, 5:02 AM MSTSpecial Weather StatementBOI43 min
Mar 3, 2:15 PM MSTWinter Storm WatchBOI13 hr
Mar 4, 3:07 AM MSTWinter Weather AdvisoryBOI44 hr
Mar 5, 4:54 PM MSTDense Fog AdvisoryBOI15 hr
Mar 7, 4:18 AM MSTDense Fog AdvisoryBOI5 hr
Apr 3, 3:31 PM MDTMesoscale DiscussionSPC89 min
Apr 12, 12:53 PM MDTMesoscale DiscussionSPC97 min
May 28, 6:11 PM MDTSevere Thunderstorm WarningBOI49 min
Jun 2, 1:31 PM MDTFlood WatchBOI29 hr
Jun 9, 12:03 AM MDTSpecial Weather StatementBOI42 min
Jun 26, 1:47 PM MDTMesoscale DiscussionSPC3 hr
Jun 26, 2:03 PM MDTSevere Thunderstorm WarningBOI42 min
Jun 26, 2:35 PM MDTSevere Thunderstorm WarningBOI40 min
Jun 26, 3:03 PM MDTSevere Thunderstorm Warning Considerable damage threatBOI42 min
Jun 26, 3:46 PM MDTSevere Thunderstorm WatchSPC5 hr
Jun 26, 4:17 PM MDTSpecial Weather StatementBOI43 min
Jul 3, 2:34 PM MDTExcessive Heat WatchBOI8 days
Jul 7, 2:09 PM MDTExcessive Heat WarningBOI7 days
Jul 11, 1:21 PM MDTFire Weather WatchBOI49 hr
Jul 15, 1:28 PM MDTExcessive Heat WatchBOI3 days
Jul 17, 2:06 PM MDTExcessive Heat WarningBOI7 days
Jul 23, 8:29 AM MDTRed Flag WarningBOI40 hr
Jul 24, 4:32 PM MDTSevere Thunderstorm Warning Considerable damage threatBOI43 min
Jul 24, 5:23 PM MDTSevere Thunderstorm WarningBOI38 min
Jul 30, 2:16 AM MDTExcessive Heat WatchBOI36 hr
Jul 31, 1:47 PM MDTExcessive Heat WarningBOI58 hr
Jul 31, 1:47 PM MDTHeat AdvisoryBOI3 days
Aug 1, 1:58 PM MDTFire Weather WatchBOI24 hr
Aug 2, 1:44 PM MDTRed Flag WarningBOI42 hr
Aug 4, 2:10 PM MDTRed Flag WarningBOI31 hr
Aug 5, 2:35 PM MDTMesoscale DiscussionSPC115 min
Aug 10, 8:49 AM MDTSpecial Weather StatementBOI41 min
Aug 11, 2:18 PM MDTFire Weather WatchBOI18 hr
Aug 12, 7:56 AM MDTRed Flag WarningBOI37 hr
Aug 14, 8:42 AM MDTRed Flag WarningBOI37 hr
Aug 15, 2:35 PM MDTFire Weather WatchBOI23 hr
Aug 16, 1:28 PM MDTRed Flag WarningBOI33 hr
Aug 20, 2:05 PM MDTFire Weather WatchBOI24 hr
Aug 21, 1:56 PM MDTRed Flag WarningBOI31 hr
Aug 23, 8:14 AM MDTRed Flag WarningBOI13 hr
Aug 26, 7:44 PM MDTWind AdvisoryBOI32 hr
Aug 31, 1:59 PM MDTFire Weather WatchBOI24 hr
Sep 1, 2:06 PM MDTRed Flag WarningBOI34 hr
Sep 2, 2:56 PM MDTMesoscale DiscussionSPC94 min
Sep 2, 6:49 PM MDTSevere Thunderstorm WarningBOI26 min
Sep 2, 7:02 PM MDTSpecial Weather StatementBOI43 min
Sep 2, 7:39 PM MDTSevere Thunderstorm WarningBOI36 min
Sep 3, 8:14 AM MDTRed Flag WarningBOI11 hr
Sep 9, 2:34 PM MDTFire Weather WatchBOI24 hr
Sep 10, 2:18 PM MDTRed Flag WarningBOI31 hr
Sep 11, 2:26 PM MDTMesoscale DiscussionSPC3 hr
Sep 16, 4:36 PM MDTSpecial Weather StatementBOI39 min
Sep 16, 5:17 PM MDTFlash Flood WarningBOI3 hr
Oct 3, 1:19 PM MDTRed Flag WarningBOI32 hr
Oct 16, 1:45 PM MDTFreeze WatchBOI20 hr
Oct 17, 9:53 AM MDTFrost AdvisoryBOI23 hr
Oct 17, 9:53 AM MDTFreeze WatchBOI23 hr
Oct 18, 8:41 AM MDTFreeze WarningBOI25 hr
Nov 7, 2:06 PM MSTAir Stagnation AdvisoryBOI4 days
Nov 19, 1:34 PM MSTWinter Weather AdvisoryBOI39 hr
Nov 28, 2:15 PM MSTAir Stagnation AdvisoryBOI9 days
Dec 1, 4:59 PM MSTDense Fog AdvisoryBOI21 hr
Dec 2, 4:53 PM MSTDense Fog AdvisoryBOI5 days
Dec 6, 2:10 PM MSTWinter Weather AdvisoryBOI34 hr
Dec 8, 3:34 AM MSTDense Fog AdvisoryBOI10 hr
Dec 8, 8:50 PM MSTDense Fog AdvisoryBOI14 hr
Dec 9, 3:14 AM MSTAir Stagnation AdvisoryBOI4 days
Dec 9, 5:24 PM MSTDense Fog AdvisoryBOI19 hr
Dec 10, 6:17 PM MSTDense Fog AdvisoryBOI18 hr
Dec 12, 1:22 PM MSTWinter Storm WatchBOI25 hr
Dec 13, 2:01 PM MSTWinter Weather AdvisoryBOI39 hr
Dec 15, 1:55 PM MSTWinter Weather AdvisoryBOI39 hr
Dec 19, 2:18 PM MSTDense Fog AdvisoryBOI15 hr
Dec 24, 2:24 PM MSTWinter Storm WatchBOI23 hr
Dec 25, 1:30 PM MSTWinter Weather AdvisoryBOI49 hr
Dec 28, 12:50 AM MSTWinter Weather AdvisoryBOI40 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 archive20232025

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.