In the 1950s, while skiing down the powder-covered slopes of the Yampa Valley in northwestern Colorado, local rancher Joe McElroy made an observation about the snow: it was so light and fluffy that it tickled his nose like champagne. The observation was so apt that decades later, Steamboat Ski Resort would trademark the name “champagne powder” to describe its unusually dry, soft snow. Many other Colorado ski resorts boast similarly light, fluffy snow, thanks to the state’s especially cold winter temperatures at high elevations. The snow attracts aficionados from across the country, who prefer skimming effortlessly atop powder over the dense, wet snowpack known to blanket parts of the Sierra Nevada in winter, which some jokingly deride as Sierra Cement. As the climate warms, Colorado may see fewer days of this light powder and more of the heavy, moist stuff, according to Noah Molotch , a professor of snow hydrology who directs the Center for Water, Earth...
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