A **significant weather shift** in California is underway for the New Year holiday, with the Bay Area experiencing a **cold snap**.
The **National Weather Service** has issued **frost and freeze advisories** as inland areas face temperatures below freezing, especially in the North, South, and East Bay.
**San Francisco** remains slightly warmer, with temperatures expected in the **lower 40s**, while inland areas may see lows in the **mid-30s**.
In contrast, **Southern California** is seeing a **warming trend** with dry weather and **gusty winds**, raising fire risks and prompting a **red flag warning**.
**Air quality alerts** are in effect for parts of Los Angeles County but will be lifted by New Year’s Day, allowing for clearer celebrations.