Crews cleared mud from key California highways as forecasters warned that more thunderstorms were on the way after downpours and high tides caused flooding, prompting road closures and rescues of people trapped in cars. Northern counties remained under a flood watch, with up to three inches of rain possible through Monday night in areas that have been drenched off and on since around Christmas. To the south near the San Francisco Bay Area, waters were slowly receding after roadways were flooded during heavy rain that coincided with record-breaking “King Tides.”  While the tides were waning, lingering thunderstorms on Sunday could cause additional problems throughout low-lying areas.