An earthquake warning system operated by the U.S. Geological Survey warned 3 million people about a quake that jolted Northern California's coast. The temblor Tuesday was the biggest test yet to the ShakeAlert system since it launched in 2019. Various phone apps use ShakeAlert data to notify users. But some people say they received an alert while the earthquake was ongoing. A glitch in one app awoke people in San Diego who were more than 600 miles from the shaking. The system represents one of a few earthquake warning technologies run by governments throughout the world.

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This year’s Labor Day Holiday saw record-breaking temperatures around the county. Redwood City broke 107 beating its old record of 97 degrees …

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As high heat and heightened demand for electricity continues across California, the state’s Independent System Operator has issued a statewide…

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PG&E is encouraging customers around the Bay Area to prepare for excessive heat on Friday that could contribute to power outages.