The Northern Lights could return to Northern California on Monday. A coronal mass ejection, known as a CME, arrived from the sun earlier than expected on Monday and was creating a strong geomagnetic storm in Earth's magnetic field, which has the potential to impact power grids, space operations and radio and satellite communications.

A 4.4 magnitude earthquake struck without warning on a Tuesday afternoon, its epicenter 120 miles north of San Francisco in remote Mendocino County wine country. Felt across the entire Bay Area by millions,

“It’s just a little bit extra wetter than usual,” Boomsma noted.

Meaning foggy and cool conditions for Martin Luther King, Jr. Day marches and events across the Valley. Once the fog lifts, the Valley can expected mostly sunny skies for the rest of the afternoon with high temperatures in the upper 50s and low 60s.

Scott Chaney, the regulatory board's executive director, cited an 11th-hour change in dates request a "bait and switch" move by Bernal Park Racing Management Company

Seismic tremors reveal a shallow fragment of ancient tectonic plate beneath Northern California, helping explain damaging earthquakes near the surface.