The Same Warming, Two Different Dangers
Rain at 10,000 feet in the Idaho Sawtooths. Rain in the Bridger Range above Bozeman, midwinter, where snowpack is supposed to stay dry and cold and light underfoot. Across the inland West, avalanche forecasters are probing snowpits and finding layers their training never prepared them for. Smooth. Hard. Wrong.
This winter, University of Washington researchers mapped what warming does to snowpack structure across the Pacific Northwest. The finding splits along a single geological line: the Cascade crest. West of it, the snow softens. East of it, something these mountains haven't produced before — a hidden architecture of ice crusts, buried and waiting, in terrain where backcountry travelers are still learning to read the danger.
The Same Warming, Two Different Dangers
Rain at 10,000 feet in the Idaho Sawtooths. Rain in the Bridger Range above Bozeman, midwinter, where snowpack is supposed to stay dry and cold and light underfoot. Across the inland West, avalanche forecasters are probing snowpits and finding layers their training never prepared them for. Smooth. Hard. Wrong.
This winter, University of Washington researchers mapped what warming does to snowpack structure across the Pacific Northwest. The finding splits along a single geological line: the Cascade crest. West of it, the snow softens. East of it, something these mountains haven't produced before — a hidden architecture of ice crusts, buried and waiting, in terrain where backcountry travelers are still learning to read the danger.
New Research
Higher Temperatures Lead to More Melt-Freeze Crusts in Snowpacks in Cooler Regions of the Pacific Northwest
Cooler, higher-elevation zones previously considered stable. The mountains that felt safe are developing the hazard profiles of riskier terrain.
Our feature this week traces the ice-crust mechanism from lab to ridgeline, and into the lives it's reshaping.
New Research
Intensifying Global Heat Threatens Livability for Younger and Older Adults
That's more than every weekend of the year. For older adults, outdoor life is being quietly foreclosed, hour by hour.
Even under-40s now face roughly 50 unsafe hours annually, a number that barely existed two generations ago.
New Research
Global Gridded Dataset of Heating and Cooling Degree Days Under Climate Change Scenarios
Hot days double in Austria and Canada at 2°C. Ireland sees a 230% surge. Cold-climate nations are building for a planet that no longer exists.
Most heat-driven cooling demand materializes before 1.5°C, ahead of nearly every national planning cycle now in place.
New Research
Global Warming Has Accelerated Significantly
Every adaptation timeline pegged to a later 1.5°C breach. Infrastructure plans, insurance models, municipal budgets, all calibrated to a slower clock.
No. Mann and others see El Niño and reduced aerosol pollution, not a permanent shift. The disagreement itself is the planning problem.
Downstream Cascade
Oregon's snowpack hit the zero percentile in February. Not low. The lowest ever measured. Across the Columbia Basin, snow water equivalent sits at the second percentile, and peak snowpack has already passed. The deficit is unrecoverable.
What unfolds from here touches everything the snow was quietly holding together. Jim Willard, who grows wine grapes and apples near Prosser, Washington, has already abandoned a block of Malbec to dry up. His missing irrigation water is the same missing snowpack that will warm salmon rivers, cut hydropower output, and dry out forest fuels weeks early. Kelli Bumbaco at the Washington State Climatologist's office has been blunt: low snowpack stretches the fire window on both ends. The Yakima Valley's junior water right holders face 44 percent of normal supply. Central Oregon's North Unit Irrigation District hasn't delivered a full allotment since 2018.
One snowpack number. A dozen systems failing in sequence.
Further Reading
