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San Francisco, California – Temperatures will plunge into the 20s and low 30s early Friday, creating dangerous cold conditions across Bay Area valleys and along major commuter routes before sunrise.
According to the National Weather Service in San Francisco, an Extreme Cold Warning and Cold Weather Advisory are in effect from 1 a.m. to 9 a.m. Friday. The coldest inland valleys in the East Bay and North Bay could drop to 24 degrees, while much of the Santa Clara Valley, Salinas Valley and coastal areas fall to around 34 degrees…