UPDATE: 21,000 Still Without Power in North Bay

PG&E reports that 21,000 customers in the North Bay are still without power this afternoon, following the 6.0-magnitude earthquake that struck southern Napa County earlier.

The quake struck around 3:20 a.m. about three miles northwest of American Canyon.

Fluctuations in data have caused U.S. Geological Survey officials to report up to 6.1 magnitude, but they have recently revised the estimate back down to 6.0. Initially, there were 31,000 customers in the North Bay and Sonoma region without power.

Most of those customers were in Napa, and St. Helena was the second most impacted area, according to PG&E spokesman J.D. Guidi.

The majority of those currently without power are still in Napa and St. Helena, Guidi said.

Related: BAY AREA QUAKE: Click here for Patch’s Full Earthquake Coverage

--Bay City News