What Snow? Final Snow Survey Yields Dry Results

Published On : 5/3/2013 8:56 AM
By : Amy Quinton
From : CCN
Categories : Local, State

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California’s final snow survey has found water content at only 17-percent of normal, meaning a below average water supply this summer. As Amy Quinton reports from Sacramento, determining just how much water is in the snowpack is becoming much more precise thanks to an airborne experiment.

This isn’t snow we’re walking through. It’s dry grass in an open field, seven thousand feet up Echo Summit in the Sierra. This is where the final manual snow survey is taken.

(if you look around, there’s not even a patch of snow we can seek out and measure)

Frank Gehrke is with the Department of Water Resources. He says it’s not surprising, given the unusually dry winter. Snow provides about a third of the water for California’s homes and farms when it melts and flows to reservoirs. Determining exactly how much water the snow holds is critical. And it’s about to get a lot easier.
(plane sound)

This is no ordinary plane landing at South Lake Tahoe Airport. It’s an airborne snow observatory run by scientists from NASA’s Jet Propulsion Laboratory. Inside the plane, scientist Tom Painter points to a big black box called a spectrometer.

“This allows us to know how much sunlight is being absorbed by the snow’s surface, and that contributes about 90-percent of the energy that goes into melting snow. Forward of it, the Lidar, let’s us know the snow depth.”

That information – collectively 600 Gigabytes of data – along with ground measurements – gives water managers a really accurate picture. Again, Frank Gerhke.

“we can determine water content over the entire over the entire basin, and we’ve never had that before and the more we can accurately forecast what will be available the better management decisions can be made.”
The Department of Water Resources will be working with the airborne snow observatory for the next three years

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