A strong pressure gradient moved into the region on the eastern side of an upper level low, bringing instability to the region that allowed for elevated thunderstorms to occur throughout the evening. As this pressure gradient moved into the region around 1am, a localized heat burst occurred over the Boise airport and near the Boise Bench neighborhood.
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The episode as NWS BOI wrote it up.
A strong pressure gradient moved into the region on the eastern side of an upper level low, bringing instability to the region that allowed for elevated thunderstorms to occur throughout the evening. As this pressure gradient moved into the region around 1am, a localized heat burst occurred over the Boise airport and near the Boise Bench neighborhood. Strong winds at 67 mph were measured at the airport and it caused local power outages.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Boise, ID wrote its last area forecast discussion before the first event at Jul 2, 7:49 PM MST, 4 hours 11 minutes earlier.
Area Forecast Discussion National Weather Service Boise ID 849 PM MDT Sat Jul 2 2022 .DISCUSSION...An upper level low positioned along the PacNW coast has brought dynamic southwest flow over the forecast area today. Persistent strong thunderstorms developed this afternoon over east-central Oregon, as well as showers and thunderstorms for the western Magic Valley. Hi-res models keep scattered showers and isolated thunderstorms over the area through the overnight/early Sunday morning period, though lower dewpoints present in the far southeast Oregon and southwest Idaho valleys may favor virga over measurable rainfall. Models continue to suggest the regeneration of strong thunderstorms in east Oregon and far west-central Idaho Sunday afternoon/evening where the best instability will be located. Main threats with thunderstorms will be cloud-to-ground lightning, gusty outflow winds, blowing dust, and small hail. No updates to the current forecast. && .AVIATION...VFR. Scattered virga/showers and isolated thunderstorms overnight. Then, strong thunderstorm development mainly over eastern Oregon and far west-central Idaho Sunday afternoon/evening. Storms will be capable of producing gusty erratic winds up to 30-45 kt and small hail. Surface winds outside of thunderstorms: variable 5-15 kt. Then, SW to NW 5-15 kt with gusts up to 20-30 kt Sunday afternoon. Winds aloft at 10k feet MSL: SW 15-25 kt. && .PREV DISCUSSION... SHORT TERM...Tonight through Monday night... Persistent troughing surrounding a closed upper low off the Washington coast will continue to dominate the weather pattern, and save much of the Pacific Northwest from more excessive heat associated with the typical summertime ridge centered over the Plains. With fast southwest flow aloft positioned over the region, and precipitable water values increasing to around 0.8" (90th percentile for this time of year), at least slight chances of showers and thunderstorms will be possible through Sunday. Visible satellite imagery shows developing convection into the Magic Valley this afternoon. By later tonight, a tightening height gradient aloft will contribute to strengthening mid-level diffluent flow into southwest Idaho this morning, and may result in a band of showers and perhaps a few thunderstorms into Sunday morning across the Treasure Valley. High-res ensemble guidance shows re-development of thunderstorms accompanying another impulse Sunday afternoon and evening across southeastern Oregon developing east-northeast towards the west-central mountains, with perhaps even greater coverage of showers and thunderstorms than on Saturday. SPC has this area in a marginal risk of severe hail and wind on Sunday. Otherwise, a significant cooling trend will begin Sunday and last into Monday, as high temperatures in the 80s return to most areas. In fact, NBM guidance has trended slightly cooler for Monday, with only 81 degrees now forecast for Boise - which is 8 degrees below normal for the date. This is in response to the inland progression of the aforementioned upper low into Washington, and subsequent mid- level height falls over the region. Cannot rule out more showers into Monday as well, especially for the west-central mountains. Winds will increase on Sunday across far southwest Idaho and southeast Oregon, with even locally stronger gusts possible elsewhere in association with thunderstorm outflows. LONG TERM...Tuesday through Saturday...Isolated showers and thunderstorms will continue on Tuesday as a low pressure system is stationed over WA. Southwest flow aloft will then return as a strong ridge builds over the desert southwest and and the trough retrogrades along the Pacific Northwest coast. Temperatures will be around 5 degrees above normal during the extended period as the strong upper level ridge and hottest temperatures remains to our south and east. A couple of shortwaves may move through the southwest flow, bringing showers and thunderstorms on Wednesday and Thursday afternoons, otherwise expect dry conditions and hotter temperatures Friday and Saturday. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...None. OR...None. && www.weather.gov/Boise www.facebook.com/NWSBoise www.twitter.com/NWSBoise DISCUSSION...SH AVIATION.....SH PREV SHORT TERM...JR PREV LONG TERM....KA
The national radar mosaic for the moment the first event began.
1 strong wind. Local standard time, as filed.
A heat burst knocked out power to the airport and NIFC, along with multiple neighborhoods on the Boise Bench.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2022Every state in 2022This day in weather historyWarnings in Idaho, July 2022
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1042367.