From my SLO Meterologist:
“For today, an upper-level low-pressure system is drawing plenty of tropical moisture from the remnants of Hurricane Blanca northward into the Central Coast. Widely scattered sprinkles or rain showers will move into the Central Coast later this morning into tonight.
There is also a chance of thunderstorms throughout the region this afternoon. Thunderstorms with lightning activity are expected to develop in the Sierra Nevada and Tehachapi Mountains and perhaps in far Eastern San Luis Obispo County today. As the upper-level low crosses the Central Coast during the overnight hours, there is potential for thunderstorms activity to continue through Wednesday morning.”
And from NWS, Monterey: