A series of strong storms in late November and early December have helped boost statewide precipitation levels, pushing them slightly above average for this time of year. These storms have also improved reservoir levels, offering a positive outlook for California’s water supply after a dry and warm start to the water year.
The California Department of Water Resources (DWR) announced an updated allocation forecast for the State Water Project (SWP). Initial forecasts released on December 2 did not account for the late-November storms due to timing, but the recent precipitation allowed for an upward revision in water allocations.
“The past several weeks has brought welcome rain and snow to Northern California and these improved conditions have allowed the State Water Project to increase the allocation forecast to the benefit of millions of Californians,” said DWR Director Karla Nemeth. “While we typically wait to provide an update until January, we felt it important to let our State Water Contractors know of the increase as soon as possible to allow them to better plan their water supply for the year ahead.”
While Northern California has seen early gains, prolonged dry conditions in the new year could offset the benefits of recent storms, particularly with dry soils that could absorb some of the spring runoff.
DWR updates SWP allocation forecasts monthly, factoring in precipitation, snowpack, and runoff data. The next update, expected in January, will incorporate data from the first snow surveys of the season. The final allocation will be determined in late spring, based on cumulative winter and early spring precipitation levels.
