San Francisco, CA – Sub-freezing temperatures as low as the mid-20s are expected early Friday, creating hazardous conditions across inland portions of the Bay Area and Central Coast.
According to the National Weather Service in San Francisco, an Extreme Cold Warning will be in effect from 1 a.m. to 9 a.m. PST Friday for the North Bay Interior Mountains and Valleys, East Bay Interior Valleys and Hills, Eastern Santa Clara Hills, Southern Salinas Valley, Interior Monterey County, the Santa Lucia Range, San Benito County, and surrounding higher terrain.
Forecasters say temperatures will fall into the mid-20s to low-30s, producing widespread freezing conditions. The coldest readings are expected in interior valleys and elevated terrain, where radiational cooling overnight will allow temperatures to drop rapidly before sunrise.
The primary impacts include heightened risk of hypothermia for people, pets, and livestock during prolonged exposure. Sensitive crops, plants, and vegetation may be damaged or killed without protective measures. Unhoused individuals and others without reliable heating face increased health risks during the warning period.
Officials urge residents to ensure portable heaters are functioning properly and used safely. Generators and grills should never be operated indoors due to the risk of carbon monoxide poisoning. Residents are advised to dress in layers if outdoors and confirm pets and livestock have adequate food, unfrozen water, and shelter.
Local city and county officials may provide information regarding available warming centers.
Temperatures are expected to gradually rise after 9 a.m. Friday as daytime heating resumes.
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