Alert archive / Idaho / Gem County

Weather alerts in Gem County, Idaho, 2025

84 weather alerts in 2025, 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 2025. Tap one for its archive.

Alerts
84
Warnings
7
Watches
14
Advisories
40
Busiest month
July14 alerts
Busiest day
July 4, 20253 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, 2025

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings2150%0
Flash flood warnings00

Each office's whole area, 2025

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Boise, ID: severe thunderstorm warnings39587%6219%24 min
NWS Boise, ID: flash flood warnings11464%2030%30 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 6, 6:55 AM MSTDense Fog AdvisoryBOI4 hr
Jan 6, 12:58 PM MSTAir Stagnation AdvisoryBOI4 days
Jan 11, 3:10 AM MSTDense Fog AdvisoryBOI8 hr
Jan 13, 1:24 PM MSTAir Stagnation AdvisoryBOI4 days
Jan 25, 10:27 AM MSTAir Stagnation AdvisoryBOI6 days
Jan 29, 1:00 PM MSTWinter Storm WatchBOI24 hr
Jan 30, 1:22 PM MSTWinter Weather AdvisoryBOI48 hr
Feb 1, 1:47 PM MSTWinter Storm WarningBOI51 hr
Feb 1, 1:47 PM MSTWinter Weather AdvisoryBOI4 days
Feb 6, 2:53 AM MSTWinter Weather AdvisoryBOI35 hr
Feb 8, 2:07 PM MSTCold Weather AdvisoryBOI5 days
Feb 11, 1:37 PM MSTWinter Storm WatchBOI14 hr
Feb 12, 4:04 AM MSTWinter Storm WarningBOI55 hr
Feb 12, 4:04 AM MSTWinter Weather AdvisoryBOI55 hr
Feb 15, 1:36 PM MSTWinter Weather AdvisoryBOI24 hr
Feb 17, 10:46 PM MSTDense Fog AdvisoryBOI14 hr
Feb 19, 8:40 AM MSTWinter Weather AdvisoryBOI5 hr
Mar 5, 1:09 PM MSTWind AdvisoryBOI34 hr
Mar 15, 3:09 AM MDTWinter Weather AdvisoryBOI33 hr
Mar 16, 5:46 PM MDTWinter Weather AdvisoryBOI12 hr
Mar 21, 1:36 PM MDTWinter Weather AdvisoryBOI14 hr
Apr 16, 12:40 PM MDTWind AdvisoryBOI32 hr
Apr 26, 5:28 PM MDTSpecial Weather StatementBOI32 min
May 29, 12:39 PM MDTHeat AdvisoryBOI54 hr
Jun 8, 1:59 AM MDTHeat AdvisoryBOI68 hr
Jun 10, 11:38 AM MDTFlood WatchBOI28 hr
Jun 10, 8:26 PM MDTSpecial Weather StatementBOI49 min
Jun 11, 12:28 PM MDTSpecial Weather StatementBOI32 min
Jun 28, 2:03 PM MDTHeat AdvisoryBOI3 days
Jul 2, 7:34 PM MDTSpecial Weather StatementBOI41 min
Jul 3, 4:49 PM MDTFlash Flood WatchBOI28 hr
Jul 3, 9:10 PM MDTSpecial Weather StatementBOI50 min
Jul 3, 9:43 PM MDTSpecial Weather StatementBOI62 min
Jul 4, 12:07 PM MDTMesoscale DiscussionSPC113 min
Jul 7, 1:23 PM MDTHeat AdvisoryBOI32 hr
Jul 8, 12:49 PM MDTRed Flag WarningBOI34 hr
Jul 9, 8:52 PM MDTAreal Flood AdvisoryBOI3 hr
Jul 12, 2:40 AM MDTHeat AdvisoryBOI66 hr
Jul 26, 7:10 PM MDTSpecial Weather StatementBOI50 min
Jul 26, 7:48 PM MDTSpecial Weather StatementBOI57 min
Jul 30, 2:26 PM MDTRed Flag WarningBOI34 hr
Jul 31, 9:38 AM MDTFlash Flood WatchBOI12 hr
Jul 31, 2:34 PM MDTMesoscale DiscussionSPC56 min
Aug 3, 8:34 PM MDTSpecial Weather StatementBOI41 min
Aug 3, 9:13 PM MDTSpecial Weather StatementBOI47 min
Aug 3, 9:49 PM MDTSpecial Weather StatementBOI41 min
Aug 4, 6:04 PM MDTSpecial Weather StatementBOI41 min
Aug 4, 6:21 PM MDTSpecial Weather StatementBOI24 min
Aug 4, 6:27 PM MDTSpecial Weather StatementBOI48 min
Aug 11, 12:35 AM MDTExtreme Heat WatchBOI13 hr
Aug 11, 1:05 PM MDTHeat AdvisoryBOI56 hr
Aug 15, 1:52 PM MDTFlash Flood WatchBOI34 hr
Aug 17, 2:41 AM MDTFlash Flood WatchBOI24 hr
Aug 25, 11:41 AM MDTFlash Flood WatchBOI58 hr
Sep 10, 7:41 PM MDTSpecial Weather StatementBOI49 min
Sep 11, 12:59 PM MDTFlash Flood WatchBOI8 hr
Sep 11, 4:09 PM MDTAreal Flood AdvisoryBOI3 hr
Sep 14, 2:10 PM MDTMesoscale DiscussionSPC2 hr
Sep 29, 6:26 PM MDTSpecial Weather StatementBOI49 min
Sep 29, 8:51 PM MDTSpecial Weather StatementBOI69 min
Sep 30, 11:43 AM MDTSpecial Weather StatementBOI47 min
Oct 1, 2:44 PM MDTFlash Flood WatchBOI43 hr
Oct 6, 1:20 PM MDTFrost AdvisoryBOI20 hr
Oct 10, 4:43 PM MDTSpecial Weather StatementBOI32 min
Oct 16, 2:05 PM MDTFrost AdvisoryBOI43 hr
Oct 20, 2:28 AM MDTFreeze WatchBOI11 hr
Oct 20, 1:06 PM MDTFreeze WarningBOI21 hr
Oct 25, 5:38 PM MDTSpecial Weather StatementBOI52 min
Nov 18, 1:26 AM MSTDense Fog AdvisoryBOI9 hr
Nov 20, 10:00 PM MSTDense Fog AdvisoryBOI12 hr
Nov 21, 1:07 PM MSTDense Fog AdvisoryBOI21 hr
Nov 23, 1:14 AM MSTDense Fog AdvisoryBOI9 hr
Nov 27, 3:13 AM MSTDense Fog AdvisoryBOI8 hr
Nov 27, 10:05 PM MSTDense Fog AdvisoryBOI11 hr
Dec 4, 1:41 PM MSTWinter Weather AdvisoryBOI33 hr
Dec 10, 1:30 PM MSTAir Stagnation AdvisoryBOI6 days
Dec 14, 5:16 AM MSTDense Fog AdvisoryBOI6 hr
Dec 15, 1:52 PM MSTHigh Wind WatchBOI7 hr
Dec 15, 8:23 PM MSTWind AdvisoryBOI45 hr
Dec 16, 12:48 PM MSTWinter Storm WatchBOI24 hr
Dec 17, 7:28 AM MSTSevere Thunderstorm Warning Considerable damage threatBOI47 min
Dec 17, 8:09 AM MSTSevere Thunderstorm Warning Considerable damage threatBOI21 min
Dec 25, 1:42 AM MSTWinter Weather AdvisoryBOI51 hr
Dec 27, 12:56 PM MSTAir Stagnation AdvisoryBOI4 days

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 archive20242026

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.