National Weather Service Offices
The National Weather Service (NWS) in the United States (US) is part of the National Oceanic and Atmospheric Administration (NOAA), a branch of the US Department of Commerce (DOC). The NWS has forecast offices, a map of which is above.
Here is a list of NWS offices that cover different California regions (generally organized north to south, similar to how storms move during our rainy season):