Now it is California's turn. The U.S. GFS model forecast for the next 7 days is amazing, with portions of the Sierra Nevada near the Oroville dam getting 10-20
inches of rain. Very bad. And heavy precipitation will hit southern CA as well, where flood and slide warnings are now in effect (see NWS warning page)
The European Center model precipitation for the same period (shown below) has a similar solution, with as much as 7-9 inches over the Sierra Nevada.
The ensembles for Santa Barbara are also in agreement for a big event on Friday, with even heavier precipitation in the mountains.
This could well be the wettest storm of the year in southern California and damaging slides and floods are quite possible.