Tag Archive for: Sierra Nevada

California’s Record Winter Storms Could Spawn Disastrous Floods

/in , /by /CalMattersby Dan Walters

The winter of 2022-23 will go into the meteorological record books for one of the heaviest – if not, the heaviest – precipitation ever experienced in California.

California has been buffeted for more than two months by a seemingly nonstop series of storms rolling in from the Pacific, soaking virtually every corner of the state. Their most unusual aspect has been the huge snowfall in Southern California mountains, where hundreds of people remain trapped in resort communities.

Full Story
Snow Survey-snowpack-DWR-Snowpack above normal-water conservation

California’s Snowpack Shows Huge Gains from Recent Storms

/in , /by

The snow water equivalent of California’s snowpack is 190% of average for March 3, 2023. After three years of drought, the bountiful winter is good news, but a drier future demands more conservation and innovative solutions for water supply in the Southwestern U.S.

The Department of Water Resources on March 3, conducted the third snow survey of the season at Phillips Station in the Sierra Nevada. The manual survey recorded 116.5 inches of snow depth and a snow water equivalent of 41.5 inches, which is 177% of average for the location on March 3. Snow water equivalent measures the amount of water contained in the snowpack and is a key component of DWR’s water supply forecast.

California’s Snowpack

DWR’s electronic readings from 130 snow sensors placed throughout the state indicate the statewide snowpack’s snow water equivalent is 44.7 inches, or 190% of average for this date.

Recent Storms

“Thankfully the recent storms combined with the January atmospheric rivers have contributed to an above-average snowpack that will help fill some of the state’s reservoirs and maximize groundwater recharge efforts. But the benefits vary by region, and the Northern Sierra, home to the state’s largest reservoir Lake Shasta, is lagging behind the rest of the Sierra,” DWR Director Karla Nemeth said. “It will also take more than one good year to begin recovery of the state’s groundwater basins.”

It Will Take More than a Single Wet Year to Recover Groundwater Levels in Some Parts of the State

Although the statewide snowpack is currently just behind the record snow year of 1982-83, the snowpack varies considerably by region. The Southern Sierra snowpack is currently 209 percent of its April 1 average and the Central Sierra is at 175 percent of its April 1 average. However, the critical Northern Sierra, where the state’s largest surface water reservoirs are located, is at 136 percent of its April 1 average. With one month of the traditional wet season remaining, DWR is providing updated runoff forecasts to water managers and is closely monitoring spring runoff scenarios and river flows to ensure the most water supply benefits from this year’s snowpack while balancing the need for flood control.

“The recent storms over the past week broke a month-long dry spell in a dramatic way,” said DWR’s Snow Surveys and Water Supply Forecasting Unit Manager Sean de Guzman. “We are hopeful that we will see more cold storms to add to our snowpack for the next month and help set up a long, slow melt period into spring.”

‘Good News’ but Conservation Remains Critical

“The results of today’s snow survey is good news for the state’s water supply, especially for those parts of the state that rely on snowmelt as their primary source of water,” said San Diego County Water Authority Water Resources Manager Jeff Stephenson. “The above average snowpack levels come after three consecutive years of drought that resulted in below normal water levels at the state’s major reservoirs. For the San Diego region, the recent local storms allow residents and businesses to turn off sprinklers and irrigation for at least several weeks, if not longer. This allows the region to keep more water in local reservoirs for use later in the year.”

California’s Snowpack and a Hotter, Drier Climate

“Despite the recent wet weather and the region’s diverse water supply portfolio, the long-term forecast of a hotter, drier climate, for the Southwest U.S., means that water use efficiency remains a key part of saving our most precious resource, in wet or dry years,” added Stephenson.

Stephenson said that there are rebates and other free services available to residents and businesses of San Diego County that can help conserve water and save money.

Airborne Snow Observatory Surveys

To ensure water supply managers have the most current forecasts of snowpack runoff, DWR is utilizing the best available technology to collect the most accurate snow measurements. DWR’s Snow Surveys and Water Supply Forecasting Unit is utilizing Airborne Snow Observatory (ASO) surveys across 12 of California’s major snow-producing watersheds to collect data on the snowpack’s density, depth, reflectiveness, and other factors down to a 3-meter resolution. These flights, which utilize LiDAR and imaging spectrometer technology, provide DWR with more information on water content than ever before, which is then fed into advanced physically based and spatially explicit models to generate the most accurate water supply runoff forecasts possible. These forecasts are used to develop the Bulletin 120 for forecasted spring run-off to determine water allocation and stream flows for the benefit of the environment.

Groundwater Basins ‘Slower to Recover’ From Drought

While winter storms have helped the snowpack and reservoirs, groundwater basins are much slower to recover. Many rural areas are still experiencing water supply challenges, especially communities that rely on groundwater supplies which have been depleted due to prolonged drought. It will take more than a single wet year for groundwater levels to substantially improve at a statewide scale. Drought impacts also vary by location and drought recovery will need to be evaluated on a regional scale and will depend on local water supply conditions.

On February 13, Governor Newsom issued an Executive Order directing state agencies to review and provide recommendations on the state’s drought response actions by the end of April, including the possibility of terminating specific emergency provisions that are no longer needed, once there is greater clarity about the hydrologic conditions this year.

Save Our Water

Californians should still continue to use water wisely so that we can have a thriving economy, community, and environment. DWR encourages Californians to visit SaveOurWater.com for water saving tips and information as more swings between wet and dry conditions will continue in the future.

DWR conducts five media-oriented snow surveys at Phillips Station each winter near the first of each month, January through April and, if necessary, May. The next survey is tentatively scheduled for April 3.

California Approaching a Record Snow Year as Yet Another Storm Hits

/in , , /by /Los Angeles Timesby Grace Toohey and Nathan Solis

California was hit Monday with yet another winter storm, adding to what has become an unusually cold and wet season that some experts say has the chance to become one of the snowiest on record if conditions continue.

The new winter storm is forecast to bring more rain and snow across the state through Wednesday, though forecasters say it isn’t expected to be as exceptional as the previous system, which brought snowfall to unusually low elevations almost statewide.

Full Story

Winter Storms Will Batter California With Snow, Strong Winds and Lightning. Here’s Full Outlook

/in , /by /San Francisco Chronicleby Gerry Diaz

A series of winter storms will work together to usher in some of the coldest and windiest conditions of the season across California. These winds will be accompanied by waves of atmospheric moisture that will crash into Northern California from Wednesday to Friday morning.

Widespread rain showers will impact most of the Bay Area on Wednesday through Friday, while periods of snow showers will be possible farther inland — including the Sierra Nevada and some foothills near the coast. These winter storms will also hoist thunderstorms onto the coastline, raising the chances for small hail and ice pellets in areas along Highways 101 and 1.

Full Story

Storms Dumped Snow on California. Will It Bring a Reprieve From the Drought?

/in , , /by /The Guardianby Gabrielle Canon

Extreme weather hammered California through the first weeks of the year – but also offered a badly needed reprieve. The deep snow dumped on the Sierra Nevada during a series of strong storms left the state with a robust water savings account of sorts.

As the weather warms over the spring and summer months, the melting snow fills rivers, streams and reservoirs long after California’s rainy season has ended. Considered one of its most important reservoirs, the snowpack provides roughly a third of California’s water supply.

Full Story

California’s Snow Pack at Decade-High for New Year After Massive Storms

/in , , /by /San Francisco Chronicleby Kurtis Alexander

After three years of drought, California is beginning 2023 with more snow on the ground than at any start to a year in a decade. State water officials trekked into the Sierra Nevada to conduct the first snow survey of the winter season on Tuesday, reporting 174% of average statewide snowpack for the date.

Full Story

Snow Study: Researchers Examine Factors Impacting Sierra Nevada Snowpack

/in , /by /Tahoe Daily Tribuneby Claire McArthur

Eight of the top 10 warmest years on record occurred in the last decade. The snowline where rain turns to powder continues to move uphill. The dry season is longer than ever as wildfires ravage forests and communities. It’s a bleak outlook for the state of the Sierra Nevada snowpack, not to mention our planet as a whole.

Full Story

Series of Winter Storms is Headed for California. Here’s When Each One is Expected to Hit

/in , , /by /San Francisco Chronicleby Gerry Díaz

Bay Area residents would do well to keep their gloves handy, as they’ll be fighting a parade of storms that started on Boxing Day. Monday’s contender brought light showers and winds that evolved into heavy rainfall and intense winds by the Tuesday morning rush hour. In parts of the East Bay hills, Peninsula and North Bay highlands, winds gusted over 50 mph and were accompanied by intense rainfall across the region, where totals exceeded an inch and a quarter at both official downtown San Francisco and Oakland weather stations. More torrential downpours came down over the Santa Cruz Mountains and North Bay highlands, where stations like Felton and Mt. Tam exceeded 4 inches of rain.

Full Story

Too Soon to Know How Sierra Nevada Snowfall Will Impact California’s Ongoing Drought

/in , , /by /CapRadioby Mike Hagerty

For the second weekend in a row, Sacramento and the Sierra Nevada mountains saw back-to-back storms bringing rain to the valley and snow to the hills. Despite the recent wet weather, including snow intense enough to snarl mountain travel in the Sierra this weekend, California is still grappling with a number of drier-than-usual winters and persistent drought. So how much did these storms help?

Full Story

Atmospheric River to Bring Precipitation to the U.S. West Coast

/in , , /by /Center for Western Water and Weather Extremes by Scripps Institution of Oceanography

A strong low-pressure system associated with an upper-level shortwave trough will impact much of the US West Coast today through Thursday, with the development of an atmospheric river over Northern California. After the initial AR, a second low-pressure system will develop offshore and travel down the coast, bringing another round of precipitation to the region Friday into Sunday.

Full Story