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See how Sparse the Sierra Nevada Snowpack Looks Compared to Last Year

/in , /by /The Mercury Newsby Paul Rogers

Two NASA satellite images released late Monday by the National Weather Service office in Sacramento starkly illustrate how much less snow is covering the Sierra Nevada this week compared to the same time a year ago.

The images, taken from roughly 438 miles above Earth, show California’s Sierra Nevada range. In the first, from Feb. 18, 2019, the region is blanketed with snow. On that day, the snowpack, which is the source of about one-third of the state’s annual water supply, was at 147% of its historical statewide average for that date.

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First California Snowpack Measurement of 2020 is Boosted by Recent Storms

/in , /by /Los Angeles Timesby Hannah Fry

After a slow start to California’s wet winter season, a series of storms that hammered the state at the tail end of 2019 dumped enough snow on the Sierra Nevada to kick off the new year with a solid snowpack.

Surveyors with the California Department of Water Resources trudged through a snow-covered field Thursday at the department’s Phillips station — fresh powder crunching beneath their snowshoes —and plunged a hollow pole into the snowpack for the first monthly measurement that serves as an important marker for the state’s water supply.

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Sierra Nevada Snowpack Begins 2020 in Good Shape, a Hopeful Sign for California Water Outlook

/in , /by /The Mercury News (San Jose)by Paul Rogers

After a dry start to California’s winter rainy season, a series of big storms that began around Thanksgiving delivered enough snow for the Sierra Nevada to begin 2020 in relatively good shape.

As of Dec. 31, the statewide Sierra Nevada snowpack — a major source of California’s water supply — stood at 94% of its historical average.

That’s the highest total in four years, when it came in at 106% on Dec. 31, 2015.

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Enough Rain? Sufficient Snow? Here’s How Wet California, and Sacramento, Got in 2019

/in , /by /The Sacramento Beeby California Department of Water Resources

It’s a new year, and a time to take stock in California’s most precious commodity: water.

While October marks the start of the new water year, state hydrology leaders opened the new year with the first measure of snowpack in the Sierra Nevada, east of Sacramento.

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Drought, What Drought? Largest Snowpack in 4 Years, Most Stored Water in Southern California History Paint Rosy Picture

/in , /by /The Orange County Register by Steve Scauzillo

With snowpack levels in the Sierra Nevada registering at 90% of normal Thursday and state reservoirs at record historic levels, the urban water supply picture for 2020 could hardly be any rosier.

Southern California water managers are trying to restrain their joy, not because of a picture-postcard mountain top, but for the bounty that will come in spring when the snow melts, sending pristine water into state reservoirs and more importantly, southward via the State Water Project aqueduct, a source that supplies 30% of Southern California’s drinking water.

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Strong Storms Boost California Snowpack to Highest December Level Since 2015

/in , /by /Los Angeles Timesby Hannah Fry

In a boost for California’s water supply, a series of recent storms that blanketed the Sierra Nevada in snow has built the state’s snowpack to its highest December level since 2015.

The snowpack — a key source of the state’s water supply — measured 113% of average this week, roughly 40% higher than the snowpack during the same time in 2018, according to the Department of Water Resources.

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California Storm Parade Continues Friday With More Rain, Feet of Sierra Snow Through The Weekend

/in , , /by /The Weather Channel by Jonathan Erdman

Another Pacific storm will surge into California Friday and last into the weekend wringing out feet of Sierra snow and more rain that could trigger additional flooding and debris flows.

Satellite imagery clearly shows the next system waiting in the wings to soak the Golden State beginning Friday.

Wednesday’s storm dumped about an inch of rain in downtown L.A. and San Diego, with locally higher amounts over the mountains.

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Mammoth Mountain received record snowfall in May 2019. Photo: Mammoth Mountain, Inc. California Reservoirs

Water Year 2020 Begins With Robust Reservoir Storage

/in , /by

Last winter was a bountiful one in terms of water supply for California, but it’s still too early to tell whether 2020 will be as generous.

The 2018-19 winter was one for the record books, with above-average precipitation. Snow continued to fall in late-spring, with several inches or more in the Sierra Nevada and the Southern California mountains.

Ski seasons were extended into May and June, delighting skiers and resort operators.

The snowfall, and a boost from late-season storms, increased the northern Sierra snowpack in May 2019, which was “atypical,” according to Alexi Schnell, water resources specialist with the San Diego County Water Authority.

The statewide Sierra Nevada snowpack was 164% of normal, with the northern Sierra at 172% of normal on May 23, 2019.

Major California Reservoirs Above Historical Average on November 8, 2019

Most major California reservoirs are above their historical averages as of November 8, 2019. (Graphic: California DWR)

Water Year 2020 begins with robust reservoir storage

The 2019 water year (October 1 – September 30) pushed snowpack levels well-above average and swelled major reservoirs to above-average. There were more than 30 atmospheric rivers, with many making landfall in Northern California. The state’s snowpack on April 1 was 175% of average.

The California Department of Water Resources said that makes a great start to 2020.

“We start the new water year in a good place,” said Karla Nemeth, director of the DWR. “However, we all know too well that California’s weather and precipitation are highly variable. What we have today could be gone tomorrow.”

Above average rainfall in San Diego

While the biggest gains in precipitation over the past year were in Northern California, the San Diego region also benefited. Water Year 2019 ended with the region at 125% of average rainfall at Lindbergh Field. The rainfall helped increase supplies in regional reservoirs.

Schnell cautioned that the climatological cycle in California can bring several consecutive years of drought, like the 2015-17 period, which prompted mandatory water-use reductions statewide.

Above-average temperatures in California in 2019

NOAA reported on November 6 that California experienced above-average to much-above-average temperatures from January through October 2019. The average U.S. temperature during that same period was 55.5°F, (0.5 of a degree above 20th-century average) “ranking in the warmest third of the record,” according to NOAA.

NOAA reported that California has had above-to much-above-average temperatures from January to October 2019.

NOAA reported that California has had above-to much-above-average temperatures from January to October 2019. (Graphic: NOAA)

Scripps Institution of Oceanography’s Center for Western Weather and Water Extremes, or CW3E, just released an analysis that calculated the odds of water year 2020 reaching 100% of water year normal precipitation totals. The odds range from 20 to 40% of the Southwest reaching 100% of water year normal precipitation.

Odds of reaching normal precipitation for Water Year 2020. (Graphic: CW3E, Scripps, UC San Diego)

National Weather Service seasonal outlook for precipitation

The three-month seasonal precipitation outlook for November-December-January by the National Weather Service Climate Prediction Center shows below-normal to normal precipitation in Central to Northern California and equal chances of below, near- or above-normal in southern California and much of the Southwest.

The November-December-January precipitation outlook from the National Weather Service.

The November-December-January precipitation outlook from the National Weather Service. (Graphic: NWS/NOAA)

“There will always be fluctuations based on weather and other factors, but the San Diego region continues to embrace water-use efficiency,” said Schnell. “The Water Authority and its 24 member agencies continue to increase San Diego County’s water supply reliability through supply diversification to provide a safe, reliable water supply to the region.”