Alert archive / Idaho / Gem County

Weather alerts in Gem County, Idaho, 2010

82 weather alerts in 2010, 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 2010. Tap one for its archive.

Alerts
82
Warnings
27
Watches
16
Advisories
32
Busiest month
June20 alerts
Busiest day
June 4, 20106 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, 2010

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings4175%250%7 min
Flash flood warnings4175%0

Each office's whole area, 2010

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Boise, ID: tornado warnings10100%0
NWS Boise, ID: severe thunderstorm warnings49884%2339%19 min
NWS Boise, ID: flash flood warnings12375%1464%36 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 2, 6:31 AM MSTDense Fog AdvisoryBOI28 hr
Jan 3, 2:56 PM MSTDense Fog AdvisoryBOI19 hr
Jan 6, 6:38 AM MSTDense Fog AdvisoryBOI4 hr
Jan 13, 3:12 PM MSTDense Fog AdvisoryBOI19 hr
Jan 14, 5:34 PM MSTDense Fog AdvisoryBOI17 hr
Jan 27, 3:37 PM MSTDense Fog AdvisoryBOI12 hr
Feb 7, 4:53 AM MSTDense Fog AdvisoryBOI6 hr
Feb 7, 2:44 PM MSTDense Fog AdvisoryBOI15 hr
Feb 26, 1:06 PM MSTWind AdvisoryBOI3 hr
Mar 12, 12:01 PM MSTWind AdvisoryBOI30 hr
Mar 12, 12:21 PM MSTWinter Weather AdvisoryBOI21 hr
Mar 28, 3:27 AM MDTWinter Storm WatchBOI24 hr
Mar 29, 2:23 PM MDTWinter Weather AdvisoryBOI28 hr
Apr 1, 2:56 AM MDTWinter Storm WatchBOI25 hr
Apr 2, 3:32 AM MDTWinter Weather AdvisoryBOI26 hr
Apr 7, 2:20 PM MDTWind AdvisoryBOI30 hr
Apr 27, 4:37 PM MDTMesoscale DiscussionSPC2 hr
May 1, 1:57 PM MDTWind AdvisoryBOI70 hr
May 5, 2:24 PM MDTWinter Weather AdvisoryBOI13 hr
May 10, 4:05 AM MDTWind AdvisoryBOI41 hr
May 17, 6:48 PM MDTSpecial Weather StatementBOI42 min
May 22, 9:19 PM MDTFreeze WarningBOI12 hr
Jun 3, 10:33 AM MDTFlash Flood WatchBOI26 hr
Jun 4, 9:40 AM MDTAreal Flood WarningBOI12 hr
Jun 4, 11:26 AM MDTRiver Flood WarningBOI7 days
Jun 4, 1:17 PM MDTFlash Flood WarningBOI104 min
Jun 4, 1:37 PM MDTSevere Thunderstorm WarningBOI53 min
Jun 4, 1:57 PM MDTFlash Flood WarningBOI67 min
Jun 4, 2:21 PM MDTFlash Flood WarningBOI60 min
Jun 4, 9:15 PM MDTAreal Flood WarningBOI7 hr
Jun 5, 4:17 AM MDTAreal Flood WarningBOI6 hr
Jun 5, 2:10 PM MDTFlash Flood WatchBOI31 hr
Jun 6, 4:23 PM MDTSevere Thunderstorm WarningBOI67 min
Jun 8, 9:18 PM MDTFlash Flood WatchBOI24 hr
Jun 20, 3:11 AM MDTFlash Flood WatchBOI18 hr
Jun 20, 10:47 PM MDTSpecial Weather StatementBOI58 min
Jun 25, 3:21 AM MDTFlash Flood WatchBOI18 hr
Jun 29, 1:41 PM MDTMesoscale DiscussionSPC64 min
Jun 29, 2:31 PM MDTSevere Thunderstorm WatchSPC10 hr
Jun 29, 5:46 PM MDTMesoscale DiscussionSPC89 min
Jun 29, 6:40 PM MDTSevere Thunderstorm WarningBOI65 min
Jun 29, 7:57 PM MDTSevere Thunderstorm WarningBOI63 min
Jul 11, 3:02 PM MDTRed Flag WarningBOI54 hr
Jul 23, 2:22 PM MDTFire Weather WatchBOI44 hr
Jul 25, 4:04 AM MDTRed Flag WarningBOI4 days
Jul 28, 1:23 PM MDTMesoscale DiscussionSPC67 min
Jul 28, 1:41 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 30, 10:15 AM MDTRed Flag WarningBOI10 hr
Jul 31, 8:55 AM MDTRed Flag WarningBOI12 hr
Aug 5, 2:47 PM MDTRed Flag WarningBOI31 hr
Aug 6, 8:07 PM MDTFlash Flood WarningBOI83 min
Aug 6, 8:44 PM MDTFlash Flood WatchBOI5 hr
Aug 7, 2:15 PM MDTFire Weather WatchBOI23 hr
Aug 8, 1:24 PM MDTRed Flag WarningBOI59 hr
Aug 9, 2:48 PM MDTRed Flag WarningBOI33 hr
Aug 20, 10:09 AM MDTFire Weather WatchBOI5 hr
Aug 20, 2:42 PM MDTRed Flag WarningBOI30 hr
Aug 21, 11:10 PM MDTSpecial Weather StatementBOI50 min
Aug 24, 10:16 AM MDTRed Flag WarningBOI65 hr
Aug 26, 3:09 AM MDTHigh Wind WarningBOI21 hr
Nov 18, 10:29 AM MSTWind AdvisoryBOI7 hr
Nov 18, 2:09 PM MSTWinter Storm WarningBOI5 hr
Nov 21, 4:30 AM MSTWinter Storm WatchBOI15 hr
Nov 21, 7:58 PM MSTWinter Storm WarningBOI43 hr
Nov 26, 12:49 PM MSTWinter Weather AdvisoryBOI39 hr
Nov 29, 2:43 PM MSTWinter Weather AdvisoryBOI53 hr
Nov 30, 1:02 PM MSTWinter Storm WarningBOI23 hr
Dec 2, 3:44 AM MSTWinter Weather AdvisoryBOI25 hr
Dec 3, 5:31 PM MSTDense Fog AdvisoryBOI14 hr
Dec 5, 2:55 PM MSTWinter Weather AdvisoryBOI23 hr
Dec 5, 10:06 PM MSTDense Fog AdvisoryBOI8 hr
Dec 6, 2:39 PM MSTDense Fog AdvisoryBOI20 hr
Dec 9, 5:48 AM MSTDense Fog AdvisoryBOI9 hr
Dec 10, 3:34 PM MSTWinter Weather AdvisoryBOI29 hr
Dec 12, 9:47 AM MSTDense Fog AdvisoryBOI5 hr
Dec 12, 4:27 PM MSTDense Fog AdvisoryBOI17 hr
Dec 14, 10:59 AM MSTWind AdvisoryBOI8 hr
Dec 16, 2:25 PM MSTWinter Storm WatchBOI22 hr
Dec 17, 12:40 PM MSTWinter Weather AdvisoryBOI24 hr
Dec 18, 3:01 PM MSTWinter Weather AdvisoryBOI31 hr
Dec 26, 2:32 PM MSTWinter Storm WatchBOI48 hr
Dec 27, 2:31 PM MSTWinter Storm WarningBOI44 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 archive20092011

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.