Overview

• The Bay Area is experiencing its coldest temperatures of the year, with lows dropping into the 20s and 30s in many inland areas, prompting frost and freeze warnings.
• Freeze warnings are in place for parts of Marin, Sonoma, Napa, Santa Clara, Monterey, and San Benito counties, while frost advisories cover other inland regions through Tuesday morning.
• The National Weather Service warns of risks to unsheltered individuals, pets, and sensitive plants due to the freezing conditions, with slightly warmer lows expected on New Year’s Day morning.
• In Southern California, a warming trend accompanied by gusty Santa Ana winds has led to red flag warnings for high fire danger in mountain areas, with a wood-burning ban issued in parts of Los Angeles County to address air quality concerns.
• The Sierra Nevada is forecast to remain mostly dry until Friday, when a storm system is expected to bring snow, rain, and strong winds to higher elevations, potentially impacting travel.