Denver and the Front Range, we’ve had a wet season — 0.62 inches [swe] ahead of normal — Matt Makens

Westwide SNOTEL snow water equivalent as a percent of normal February 11, 2015 via the NRCS
Westwide SNOTEL snow water equivalent as a percent of normal February 11, 2015 via the NRCS

From (Matt Makens):

We’ve had snows, but nothing too big. Denver’s largest snow has been 5.4 inches on December 29, 2014.

Since moisture is critical to the state, and so many neighboring state’s rely on our snowpack, let’s check on how the season is doing…

For Denver and the Front Range, we’ve had a wet season — 0.62 inches ahead of normal. Further, this north-central section has been Colorado’s wettest on average. For Denver alone, the season’s snowfall is currently about 3 inches behind, but we’ve had rain to compensate so our total moisture is in good shape.

The south-central mountains on the other hand are the driest. Closing in on a quarter inch below average, this area needs quite a bit of snowfall to return to normal. Just looking at snowfall, that area is 59 percent of normal water within their snowpack. (see attached image of Colorado’s current water from snowpack status). The entire mountain range needs snow. Remember, our snowpack provides water for all of the southwestern US, and without it, they will be in water trouble too.

West Drought Monitor February 3, 2015
West Drought Monitor February 3, 2015

From the National Water and Climate Center via the Sierra Sun Times:

An unusually warm, dry January slowed snowpack accumulation in much of the West, according to data from the second 2015 forecast by the United States Department of Agriculture’s National Water and Climate Center (NWCC). California, Arizona and New Mexico, as well as parts of Colorado, Utah, Oregon and Nevada, remain in prolonged drought.

“January is usually a big month for snowpack accumulation,” NWCC hydrologist Cara McCarthy said. “But most of the West didn’t see significant gains this month. With isolated exceptions, only Arizona, New Mexico, Utah and Montana received near average precipitation last month.”

“This is as low a snowpack as I’ve seen across the Sierra Nevada and Cascades for many locations at this time of year,” said NWCC Director Mike Strobel. Several Snow Telemetry (SNOTEL) sites in those ranges are snowless, which is very unusual for this time of year.

Even the precipitation in the Southwest wasn’t enough to take these regions out of drought conditions. In Western states where snowmelt accounts for the majority of seasonal water supply, information about snowpack serves as an indicator of future water availability. Streamflow in the West consists largely of accumulated mountain snow that melts and flows into streams as temperatures warm in spring and summer. NWCC scientists analyze the snowpack, air temperature, soil moisture and other measurements taken from remote sites to develop the water supply forecasts.

The Cascades of Oregon and Washington have received normal levels of precipitation this water year, but it’s mostly fallen as rain instead of snow. California’s Sierra Nevada has seen little rain or snow. The extreme drought in California may be further aggravated by reduced streamflow in other parts of the West.

“This month the inflow forecast for Lake Powell fell from 90 to 70 percent of normal,” said McCarthy. “Because southern California draws water from the Colorado River, this may impact their water supply. This is only the second forecast of the season, and there’s still time for conditions to change. We’ll keep watching conditions and updating our forecasts as the year continues.”

The NWCC, part of USDA’s Natural Resources Conservation Service, monitors conditions year-round and will continue to issue monthly forecasts until June. The water supply forecast is part of several USDA efforts to improve public awareness and mitigate the impacts of climate change, including drought and other extreme weather events. Through the creation of the National Drought Resilience Partnership, launched as part of the President’s Climate Action Plan, federal agencies are working closely with states, tribes and local governments to develop a coordinated response to drought.

Since 1939, USDA has conducted snow surveys and issued regular water supply forecasts. Other resources on drought include the U.S. Drought MonitorThis is an external link or third-party site outside of the United States Department of Agriculture (USDA) website.. For information on USDA’s drought efforts, visit USDA Disaster and Drought Information. And to learn more about how NRCS is helping private landowners deal with drought, visit the NRCS’ drought resources.

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