Loss Of Snowpack Across West Moving At A "Stunning" Pace; Rio Grande Basin At 8% Of Avg, Lower Colorado At 10%
Snow surveys taking place across the American west this week are offering a grim prognosis, after a historically warm winter and searing March temperatures left the critical snowpack at record-low levels across the region. Experts warned that even as the heat begins to subside, the stunning pace of melt-off over the past month has left key basins in uncharted territory for the dry seasons ahead. Though there’s still potential for more snow in the forecast, experts said it will probably be too little too late. “This year is on a whole other level,” said Dr Russ Schumacher, a Colorado State University climatologist, speaking about the intense heat that began rapidly melting the already sparse snowpack in March. “Seeing this year so far below any of the other years we have data for is very concerning.”
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It’s not just the amount of snow left on mountaintops that’s concerning experts, but the amount of moisture still frozen within them. “Snow water equivalent” (SWE), a measurement of what could melt off to supply natural and manmade systems, is exceptionally low. California’s Sierra Nevada had just 4.9in of SWE, or 18% of average on Wednesday, according to the state’s department of water resources. In the Colorado River headwaters, an important basin that supplies more than 40 million people across several states, along with 5.5m acres of agriculture, 30 tribal nations, and parts of Mexico, had just over 4in of SWE on Monday, or 24% of average. That’s less than half what was previously considered the record low.
Schumacher said the incoming storm could slow the early melting but won’t be enough to pull the basins back from the brink. Snow water equivalent measurements going into April were at levels typically seen in May or June, after months of melt-off, according to Schumacher.
The issue is extremely widespread. Data from a branch of the US Department of Agriculture (USDA), which logs averages based on levels between 1991 and 2020, shows states across the south-west and intermountain west with eye-popping lows. The Great Basin had only 16% of average on Monday and the lower Colorado region, which includes most of Arizona and parts of Nevada, was at 10%. The Rio Grande, which covers parts of New Mexico, Texas and Colorado, was at 8%. “This year has the potential of being way worse than any of the years we have analogues for in the past,” Schumacher said.
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https://www.theguardian.com/us-news/2026/apr/01/snowmelt-american-west
= new reply since forum marked as read
I started to say to the left of 100° W longitude, but the lower Mississippi is a better marker. And right now the southeastern US is fairly critical for fire.
