chance of thunderstorms for valley and mountains

From the National Weather Service in Sacramento: MONSOONAL MOISTURE MOVING INTO NORTHERN CALIFORNIA WILL COMBINE WITH A WEATHER DISTURBANCE PASSING OVER THE AREA LATER TODAY TO SPARK THUNDERSTORM ACTIVITY TONIGHT INTO EARLY SUNDAY. ISOLATED THUNDERSTORMS ARE EXPECTED IN THE CENTRAL VALLEY AND SIERRA FOOTHILLS WITH SCATTERED STORMS OVER THE SIERRA...SOUTHERN CASCADES...AND MOUNTAINS WEST OF THE SACRAMENTO VALLEY. ANY THUNDERSTORMS THAT FORM WILL INITIALLY HAVE LITTLE TO NO RAIN...POSING INCREASED FIRE DANGER. GUSTY WINDS ARE ALSO POSSIBLE ALONG WITH BRIEF HEAVY RAIN ONCE PRECIPITATION IS ABLE TO REACH THE GROUND. THUNDERSTORMS WILL DIMINISH ACROSS THE AREA SUNDAY MORNING FROM SOUTHWEST TO NORTHEAST AS DRIER AIR MOVES INTO THE REGION.