The Docket | Emerging Science

The Ice Crust

The Same Warming, Two Different Dangers

By Yuki Tanabe— March 25, 2026

Feature image for article: 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 Ice Crust

The Same Warming, Two Different Dangers

By Yuki Tanabe— March 25, 2026

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.

Western Mountain Dashboard

By late March, the Western mountains are supposed to be holding billions of gallons in snowpack. Frozen savings accounts for the cities, farms, salmon runs, and hydropower turbines that draw on them through summer and fall.

Here's what's actually up there this week: record lows across multiple basins, March temperatures that belong in June, and forecasts being revised in directions nobody wanted. Six data points from the mountain West as it stands right now. No analysis, no projections about what it all means downstream. Just the numbers, the records, and the early outlooks.

Western Mountain Dashboard

By late March, the Western mountains are supposed to be holding billions of gallons in snowpack. Frozen savings accounts for the cities, farms, salmon runs, and hydropower turbines that draw on them through summer and fall.

Here's what's actually up there this week: record lows across multiple basins, March temperatures that belong in June, and forecasts being revised in directions nobody wanted. Six data points from the mountain West as it stands right now. No analysis, no projections about what it all means downstream. Just the numbers, the records, and the early outlooks.

Snow Drought

Oregon's Snowpack Just Set a Record Nobody Wanted

Statewide snow water equivalent bottomed at 2.9 inches in early February, nearly 30% below the previous record from 2015. Mid-March average: 29% of normal. Colorado, Arizona, and the Colorado River Basin are also reporting record-low snowpack this season.

Cascade Divide

One Mountain Range, Two Opposite Avalanche Futures

University of Washington researchers found warming creates more avalanche-prone ice crusts in colder inland zones like Eastern Washington, Idaho, and Montana. The warmer maritime Cascades get slush instead of ice, potentially lowering risk. Same warming signal, split by a single ridgeline.

Heat Records

479 Stations Broke March Records in Four Days

Four Arizona and California stations hit 112°F on March 20, a new all-time U.S. March record. Flagstaff reached 84°F, eleven degrees above any previous March day and four above any April day ever recorded there. Attribution analysis: virtually impossible without climate change.

Fire Outlook

Less Snow Means Fire Season Starts Earlier

Washington Deputy Climatologist Karin Bumbaco: when snowpack is this thin, it melts out sooner, widening the fire window. NOAA forecasts drought persisting across the West through June, with new drought developing in areas currently drought-free.

Water Supply

Yakima Farmers Told to Expect 44% Allocation

Bureau of Reclamation projects junior water rights holders in the Yakima Basin will receive 44% of normal supply. Fields that grow hops, cherries, and apples will go fallow or unplanted. Lake Powell's most probable forecast hits minimum hydropower elevation by December.

Drought Expansion

It Rained Plenty. The Snow Still Disappeared.

Northern Idaho is experiencing its first large-scale "wet snow drought": near-normal precipitation falling as rain instead of snow. Oregon's November-through-February temperatures tied 1934 as warmest on record. The Deschutes, Yakima, and Rio Grande basins continue deteriorating.

New Research

Higher Temperatures Lead to More Melt-Freeze Crusts in Snowpacks in Cooler Regions of the Pacific Northwest

Alden et al. document how warming creates buried ice crusts in Pacific Northwest snowpacks, producing weak layers that collapse under new snow. Warmer winters don't just reduce snowpack. They make what remains more dangerous to move through.

Where is this hitting?

Cooler, higher-elevation zones previously considered stable. The mountains that felt safe are developing the hazard profiles of riskier terrain.

Want the full picture?

Our feature this week traces the ice-crust mechanism from lab to ridgeline, and into the lives it's reshaping.

Intensifying Global Heat Threatens Livability for Younger and Older Adults

Hours of outdoor heat too extreme for routine activity have doubled worldwide since the 1950s. For adults over 65, roughly 900 hours a year now exceed the threshold where even light tasks in shade become physiologically unsafe. The study, from ASU's Jennifer Vanos and The Nature Conservancy's Luke Parsons, measures what aging bodies can actually do in heat, not just whether they survive it.

Why does 900 hours matter?

That's more than every weekend of the year. For older adults, outdoor life is being quietly foreclosed, hour by hour.

What about younger people?

Even under-40s now face roughly 50 unsafe hours annually, a number that barely existed two generations ago.

Global Gridded Dataset of Heating and Cooling Degree Days Under Climate Change Scenarios

At 2°C warming, 3.79 billion people will live with extreme heat by 2050, up from 23% of the global population in 2010 to 41%. Oxford's Dr. Jesus Lizana and colleagues found the sharpest adaptation pressure arrives before 1.5°C, meaning cooling infrastructure is an immediate need, not a future line item.

Where's the surprise?

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.

How short is the window?

Most heat-driven cooling demand materializes before 1.5°C, ahead of nearly every national planning cycle now in place.

Global Warming Has Accelerated Significantly

After stripping out El Niño, volcanic, and solar noise, Potsdam Institute physicists Grant Foster and Stefan Rahmstorf detected a near-doubling in the underlying warming rate since 2015, to roughly 0.35°C per decade across all five major temperature datasets. If the pace holds, 1.5°C falls before 2030. Some climate scientists, including Michael Mann, argue recent spikes reflect temporary factors, not structural acceleration.

What compresses?

Every adaptation timeline pegged to a later 1.5°C breach. Infrastructure plans, insurance models, municipal budgets, all calibrated to a slower clock.

Is the debate settled?

No. Mann and others see El Niño and reduced aerosol pollution, not a permanent shift. The disagreement itself is the planning problem.

New Research

Higher Temperatures Lead to More Melt-Freeze Crusts in Snowpacks in Cooler Regions of the Pacific Northwest

Alden et al. document how warming creates buried ice crusts in Pacific Northwest snowpacks, producing weak layers that collapse under new snow. Warmer winters don't just reduce snowpack. They make what remains more dangerous to move through.

Where is this hitting?

Cooler, higher-elevation zones previously considered stable. The mountains that felt safe are developing the hazard profiles of riskier terrain.

Want the full picture?

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

Hours of outdoor heat too extreme for routine activity have doubled worldwide since the 1950s. For adults over 65, roughly 900 hours a year now exceed the threshold where even light tasks in shade become physiologically unsafe. The study, from ASU's Jennifer Vanos and The Nature Conservancy's Luke Parsons, measures what aging bodies can actually do in heat, not just whether they survive it.

Why does 900 hours matter?

That's more than every weekend of the year. For older adults, outdoor life is being quietly foreclosed, hour by hour.

What about younger people?

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

At 2°C warming, 3.79 billion people will live with extreme heat by 2050, up from 23% of the global population in 2010 to 41%. Oxford's Dr. Jesus Lizana and colleagues found the sharpest adaptation pressure arrives before 1.5°C, meaning cooling infrastructure is an immediate need, not a future line item.

Where's the surprise?

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.

How short is the window?

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

After stripping out El Niño, volcanic, and solar noise, Potsdam Institute physicists Grant Foster and Stefan Rahmstorf detected a near-doubling in the underlying warming rate since 2015, to roughly 0.35°C per decade across all five major temperature datasets. If the pace holds, 1.5°C falls before 2030. Some climate scientists, including Michael Mann, argue recent spikes reflect temporary factors, not structural acceleration.

What compresses?

Every adaptation timeline pegged to a later 1.5°C breach. Infrastructure plans, insurance models, municipal budgets, all calibrated to a slower clock.

Is the debate settled?

No. Mann and others see El Niño and reduced aerosol pollution, not a permanent shift. The disagreement itself is the planning problem.

Downstream Cascade

When the Snowpack Vanishes, Everything Downstream Breaks

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.

Downstream Cascade

When the Snowpack Vanishes, Everything Downstream Breaks

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.

Hydropower gap:

Washington's hydro output dropped 23 percent during the 2023 drought year, backfilled partly by burning natural gas

Fire acceleration:

Cascade stations show snowpack deficits exceeding 12 inches of water equivalent, drying heavy fuels that normally stay wet into July

Salmon threat:

Columbia and Snake river dam operations may shift this summer to manage warmer, lower flows through the system

Early meltout:

Four eastern Oregon stations recorded snowpack vanishing 34 to 70 days ahead of the normal schedule