#Vail-area #snowpack still lags behind historic median levels — The Vail Daily #runoff

From The Vail Daily (Scott Miller):

The massive storm that hit Colorado’s Front Range over the weekend didn’t do much to aid the local snowpack. And that snowpack continues to lag behind the 30-year median.

According to the latest numbers from U.S. Department of Agriculture’s measurement sites at Vail, Copper Mountain and Fremont Pass, the snowpack, as measured in “snow water equivalent,” is 90% or less of the 30-year median. Copper Mountain is the closest measurement site to Vail Pass, and Fremont Pass is the closest measurement site to the headwaters of the Eagle River. Vail Mountain’s measurement is the lowest of the three, at 76% of the 30-year median…

This season’s accumulation at Vail has already passed the peak snowpack recorded in 2011-2012, the lowest year on record. Snowpack is near or past the peaks recorded in the lowest years on record at Copper Mountain and Fremont Pass…

More heat, more evaporation
Hannah Holm of the Ruth Powell Hutchins Water Center at Colorado Mesa University said early snowmelt also exposes bare ground, which heats up more easily than snow. More heat means more evaporation, which also means less water flowing into streams.

And those dry years have become more and more frequent. Diane Johnson, the communications and public affairs manager for the Eagle River Water & Sanitation District, noted that three of the four lowest snow years on record have come in the past decade.

“We’re not just responding to a one-year drought,” Johnson said, adding that people in the water supply business are calling this 20-year drought cycle a “millennium drought.”

Johnson added that simple snowpack measurements are only part of a fairly complex equation for water supplies.

As Holm noted, it’s important how quickly snow melts in the spring. Johnson said that one of the lowest snow years on record, 2001-2002, had the benefit of a cool spring to keep the limited snowpack on hillsides.

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