#ColoradoRiver Basin Winter Forecast Signals Dry Times Ahead — KUNC #COriver #aridification

Low flows on the Colorado River. Photo: Vicki Devine (CC BY-NC-ND 2.0

From KUNC (Luke Runyon):

All signs are pointing to a dry start to 2021 across much of the Colorado River watershed, which provides water to about 40 million people in the Western U.S.

A lack of precipitation from April to October made this spring, summer and fall one of the region’s driest six-month periods on record. And with a dry start to winter, river forecasters feel more pessimistic about the chances for a drought recovery in the early part of 2021.

West Drought Monitor December 15, 2020.

“We’re starting off water year 2021 with widespread much below-average soil moisture conditions and snow water equivalent conditions,” said Cody Moser, a hydrologist with the Utah-based Colorado Basin River Forecast Center.

Some weather stations in Colorado, Utah, Arizona and Nevada have recorded their driest years on record, Moser said. There doesn’t seem to be much relief in sight. Short-term and long-term weather forecasts all point to above-average temperatures and below-average precipitation for the foreseeable future.

Exceptional drought conditions have expanded across 65% of the Colorado River watershed. Low soil moisture heading into winter will also play a role in how snowpack accumulates this season, and how much water will flow into streams and reservoirs during spring runoff, adding pressure to large-scale water users like municipalities and farmers.

Most major rivers in the basin are projected to flow well below normal levels next year due to extremely low soil moisture conditions, though Moser said there’s significant uncertainty about water supply forecasts so early in the season.

But given the dry conditions heading into winter, an average snowpack won’t be enough to provide significant relief, Moser said…

A recent forecast from the Bureau of Reclamation, the federal agency that operates Western water infrastructure, showed the Colorado River’s largest reservoirs are likely to drop next year if demands stay the same.

Without a high snowpack this winter, the agency forecasts the Colorado River system’s biggest reservoirs will be reduced to a combined 44% of their total capacity by fall 2021.

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