NBC 7’s Omari Fleming spoke to Goldy Herbon with the San Diego Water Authority about the impact Tuesday’s storm had on our drought conditions.
NBC 7’s Omari Fleming (R) spoke to Goldy Herbon with the San Diego Water Authority about the impact the Tuesday, Dec. 14 storm had on our drought conditions. (Screenshot Courtesy NBC7 San Diego)
The San Diego County Water Authority is working in support of state efforts to conserve water after two record-dry years in California.
Senior Water Resources Specialist Goldy Herbon discussed the water shortage contingency plan with KUSI’s Paul Rudy.
As California Governor Gavin Newsom asks residents of the state to cut water usage by 15%, the San Diego County Water Authority is supporting that request while simultaneously working on long-term solutions to combat water shortages.
Goldy Herbon, Senior Water Resources Specialist for the Water Resources Department at San Diego County Water Authority, said there is no imminent concern over water shortages in San Diego County, however, it is important for locals to cut back now to set the area up for success in the future.
It’s that time of the year in California, when water managers, climatologists and meteorologists look at the factors that determine what the winter will bring during Water Year 2020-21 (October 1, 2020 – September 30, 2021).
The National Oceanic and Atmospheric Administration recently said that La Niña conditions are present in the tropical Pacific, “with an approximately 85% chance of La Niña lasting through the winter.” Forecasters currently think this La Niña will be on the stronger side. For California, those conditions typically mean a drier winter, with increasingly dry conditions heading into 2021.
It’s that time of the year in California, when water managers, climatologists and meteorologists look at the factors that determine what the winter will bring during Water Year 2020-21 (October 1, 2020 – September 30, 2021).
The National Oceanic and Atmospheric Administration recently said that La Niña conditions are present in the tropical Pacific, “with an approximately 85% chance of La Niña lasting through the winter.” Forecasters currently think this La Niña will be on the stronger side. For California, those conditions typically mean a drier winter, with increasingly dry conditions heading into 2021.
Fortunately for the San Diego region, any impacts from La Niña will be lessened because of the region’s development of a diversified water supply portfolio. Following a record number of acres burned from wildfires in 2020, La Niña would only increase fire danger.
La Niña continues in the tropical Pacific, with an approximately 85% chance of lasting through the winter, according to NOAA’s October 2020 La Niña update. Graphic: NOAA
But, whether the forecasts come to fruition, and what that means for California’s water supply, won’t be fully known until next spring. What we know now is that the water year that just ended (October 1, 2019 – September 30, 2020) varied across the state.
While Northern California was mostly dry, parts of Southern California experienced above average precipitation, according to the California Department of Water Resources. The agency said that the water year ended below average and pointed to the impact of climate change on the California’s water supply.
“California is experiencing the impacts of climate change with devastating wildfires, record temperatures, variability in precipitation, and a smaller snowpack,” said DWR Director Karla Nemeth. “We must continue to invest in our infrastructure to prepare the state to cope with more extreme weather for the state’s needs today and in the future.”
For Water Year 2020, a lack of precipitation resulted in a snowpack of just 50% of average on April 1, as measured by the California Cooperative Snow Survey Program, making it the 10th smallest snowpack in California since 1950, according to the DWR. California’s reservoirs received just a third of the water runoff from precipitation and snowmelt that they did during the same time period a year ago.
The wet season got off to a slow start, but a series of storms in late November and early December pushed 2019 precipitation to near or above average in central and southern California, according to Goldy Herbon, San Diego County Water Authority senior water resources specialist.
“The wet start didn’t last with dry conditions taking hold over most of the state in January, and then most of California experienced its driest February on record,” said Herbon.
While precipitation picked up in March 2020 for Southern California, statewide snowpack in mid-March was only 38% of average.
“The dry north/wet south precipitation pattern continued in March and April, with some locations in Southern California setting many daily precipitation records, San Diego included, as northern California precipitation levels remained below average,” said Herbon.
Despite the below average year in northern California, Herbon said statewide water supplies are in “excellent shape” thanks to above average precipitation the previous year and good reservoir storage. DWR reports that statewide reservoir storage through the end of September 2020 was projected to be 93% of average.
In the San Diego region, a wet spring boosted rainfall totals to near or above normal.
Regional precipitation during Water Year 2020. Graphic: National Weather Service San Diego
In San Diego County and across California, it’s been an awesome April for precipitation.
The Sierra snow pack, although still much smaller than normal for this point in spring, has partially made up what had been a huge shortfall just a few weeks ago. And just about every place from the desert to the coast has benefited from a substantial soaking.
Last week’s record-breaking storm lifted San Diego County well above normal precipitation for the rainfall season. The city of San Diego has had its wettest spring in decades, and it has already recorded 3 more inches of rain since Oct. 1 than it normally gets in an entire year.
The San Diego region is being drenched by a rare spring storm system, but all that moisture isn’t adding much to the region’s supply of drinking water.
The snow was falling in the San Diego county mountains on Wednesday, pretty heavily in some places.
That comes courtesy of a slow-moving cold storm system coming into the region from the north.
The region’s National Weather Service office called this prolonged six-week run of rain in March and April, pretty rare for the region.
No ‘March Miracle’ for snow and rain in California, but the San Diego County Water Authority has diversified water supply sources to weather the boom-and-bust cycle of California winters.
March brought abundant precipitation throughout California, but not enough to offset a dry February. Most large urban water agencies in the state maintain a reliable water supply in wet and dry years.
“California’s climate variability is why a water resilience portfolio is needed to provide a safe and plentiful water supply,” said Goldy Herbon, Water Authority senior water resources specialist. “Whether a wet or dry year, the Water Authority and its 24 member agencies have successfully diversified water sources to ensure a reliable supply to meet the needs of the region’s 3.3 million people.”
The supply sources include water from the Claude “Bud” Lewis Carlsbad Desalination Plant, where ten workers volunteered to live on-site to keep the water flowing during the coronavirus pandemic.
March was wetter than normal for much of the region.
Some interesting numbers from last month: Palm Springs recorded their 4th wettest March on record, with more rain than San Diego!
San Diego recorded it's highest and lowest March temperature on the same day – March 3! #cawx pic.twitter.com/g0aIW7sqEv
— NWS San Diego (@NWSSanDiego) April 4, 2020
Lindbergh Field has received 9.76 inches of rain – or 108% of normal – from October 1, 2019 – April 2, 2020. Many areas in the San Diego region received snow in March, including the Anza-Borrego Desert State Park.
Even with a lackluster winter, the state’s six largest reservoirs hold between 82% and 125% of their historical averages for April 1, according to the California Department of Water Resources. Lake Shasta is 98% of its historical average and is at 79% of capacity.
The Department of Water Resources April 1 conducted the fourth manual snow survey of 2020 at Phillips Station near Lake Tahoe. The manual survey recorded 43.5 inches of snow depth and a snow water equivalent (SWE) of 16.5 inches, which is 66% of the April average for this location.
The SWE measures the amount of water contained in the snowpack, which provides a more accurate forecast of spring runoff. Measurements from the 130 electronic snow sensors, scattered throughout the state, indicate that the statewide snowpack’s water equivalent is 15.2 inches, or 53% of the April average.
The natural-color satellite images above, acquired by the Moderate Resolution Imaging Spectroradiometer (MODIS) instruments on NASA’s Terra and Aqua satellites, show the area covered by snow in March 2020 compared to March 2017 (a record high year). Graphic: NASA/NASA JPL
“While today’s survey results show our snowpack is better off than it was just last month, they still underscore the need for widespread, wise use of our water supplies,” said DWR Director Karla Nemeth. “California’s climate continues to show extreme unpredictability, and February’s record dryness is a clear example of the extremes associated with climate change.”
On average, the snowpack supplies about 30% of California’s water needs as it melts in the spring and early summer, the state agency reported in news release.
#ICYMI DWR conducted the 4th Phillips Station snow survey of 2020. The manual survey recorded 43.5" of snow depth & a snow water equivalent of 16.5", which is 66% of avg. for this location.
Statewide, the Sierra snowpack is 53% of avg.
More here: https://t.co/LYJxIHicfC pic.twitter.com/8tRS9RrMFU
— CA – DWR (@CA_DWR) April 1, 2020
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