Each winter, high elevation snow blankets mountains for skiers and sledders, forming a natural reservoir that will slowly melt as winter warms into spring and provide a steady flow into creeks and rivers. At lower elevations, where it doesn’t linger as long, snow replenishes moisture in the soil and provides water for rangeland plants. But on Jan. 1, just 379,000 acres across the West were covered with snow, much less than the usual roughly 1.4…