Managing & Protecting California’s Water Resources
The Department of Water Resources (DWR) is responsible for managing and protecting California’s water resources. DWR works with other agencies to benefit the State’s people and to protect, restore and enhance the natural and human environments.

DWR Talks Season-to-Season Weather Forecasting
  • From left, Jeanine Jones, DWR Interstate Resources Manager; Duane Waliser, Chief Scientist, NASA JPL’s Earth Science and Technology Directorate; and Grant Davis, DWR Director at the Nov. 9, 2017 workshop on improving long-range forecasting. Mr. Waliser received the DWR Climate Science Service Award.
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California receives about half of its annual water supply from a handful of winter storms called atmospheric rivers. Predicting the arrival and intensity of those storms would greatly benefit water managers, reservoir operators, and flood prevention agencies in their work to sustainably manage water supply and protect people and property from flood damage. The trouble is, weather forecasting beyond a week becomes unreliable. At 7 days out, forecasts are about 70 percent accurate, but the 14-day forecast is only 7 percent accurate. “That just isn’t adequate for water management,” said DWR Director Grant Davis.

On Nov. 9, Mr. Davis and DWR Interstate Resources Manager Jeanine Jones joined experts from state, federal, and local governments for a workshop, co-sponsored by DWR and the Association of California Water Agencies, on improving “season-to-season” weather forecasting accuracy. Achieving the goal of accurate long-range precipitation predictions will require continued investments in forecasting technology and infrastructure. New radar stations are being installed at Lake Oroville and near Carquinez Strait to gather information on incoming atmospheric rivers.

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Grant Davis