Winter storm warning brings heavy June snow to northern Rockies
A winter storm warning is in effect across high-elevation parts of Idaho, Montana and Wyoming through early this week, with Yahoo reporting up to three feet of heavy snow in some mountain zones. The Weather Channel expects several inches above 6,000 feet plus record-challenging June cold across the northern Rockies.
Forecasters say a sharp southward plunge of the jet stream pulled unseasonably cold air into the Northwest over the first full weekend of summer. The shift arrives as national parks in the region enter one of their busiest stretches of the year, turning a late-June heat break into a backcountry hazard for campers, hikers and high-pass drivers.
Key Takeaways
- Winter storm warnings cover high-elevation areas in Montana and Idaho, with accumulating snow likely above roughly 6,500 feet.
- Yahoo reports a winter storm warning ahead of up to three feet of heavy snow this week; The Weather Channel forecasts several inches on grassy high terrain.
- Record June cold is possible, with mountain highs in the 40s and 50s and overnight lows near freezing in some spots.
- The Idaho State Journal reports East Idaho is bracing for mountain snow and record cold Sunday through Monday.
- Officials warn of hypothermia risk, downed trees and blocked backcountry roads; travelers should delay trips when possible.
Why is snow falling in June across the northern Rockies?
The cold pattern stems from a sharp jet-stream dip and accompanying cold air over the Northwest U.S., according to The Weather Channel. That setup is cold enough to produce mountain snow across Idaho, western Montana and northwestern Wyoming even as lower elevations see chilly rain.
Colder air reached the Northwest and northern Rockies on Friday, peaked over the weekend and was expected to linger into Monday and possibly Tuesday. For more on how advanced tools are reshaping severe-weather coverage, browse our Future Tech & AI Wonders hub.
Which areas face the heaviest snow from this winter storm warning?
Yahoo reports that a winter storm warning was issued with up to three feet of heavy snow possible in parts of the warned zone this week across the northern Rockies. The Weather Channel expects snow as low as 6,000 feet in western Montana and Idaho and near 8,000 feet in northwest Wyoming.
Several inches of accumulation are possible, especially on grassy surfaces, though warm pavement from recent heat may limit buildup on roads. The Idaho State Journal says East Idaho is bracing for mountain snow and record cold from Sunday through Monday as the front sweeps through.
How could record cold make this storm especially dangerous?
The Weather Channel warns that high-country temperatures may struggle to leave the 40s and 50s, while nighttime lows could dip into the 30s and flirt with daily records in parts of eastern Oregon and Idaho. Some cold spots could even see a summer frost or freeze at the highest elevations.
That chill raises hypothermia risk for anyone unprepared in the backcountry. Heavy, wet snow can also load summer-green tree branches and snap limbs, blocking forest roads and cutting off remote routes.
What should travelers and campers do now?
Anyone with outdoor plans should monitor updates from local National Weather Service offices before heading toward Glacier, Yellowstone or other high-elevation destinations. Delay backcountry travel when possible, and carry tire chains, shovels, blankets, water and first-aid supplies if crossing mountain passes is unavoidable.
Conditions should gradually improve by midweek as the upper low tracks east, but the weekend into Monday remains the most hazardous window for snow, wind and record cold across the northern Rockies.