Each year the Northern New York region gets a half-dozen or more freezing rain events, and every few years we might see an actual ice storm (technically at least 0.25 inches ice accumulation). But the storm that froze the North Country in up to two inches of glaze between December 21 and 23, 2013, was exceptional.
It didn’t have quite the punch of “The Great Ice Storm of 1998” in which freezing rain tumbled for 80 solid hours, but in some locations damage was extensive.
Ice storms happen when a warm, moisture-laden front slides up and over a cold air mass, and then lets loose the water works. Cumulus clouds billow up (occasionally spawning winter lightning), and when cloud air temperature is between 25 and 30F, the resulting subcooled rain freezes to cold surfaces. Warmer than 30, it rains; colder than 25, it sleets. If the warm front is slow-moving—or worse yet, stalls—the ice really builds up. » Continue Reading.