California
Plain guides to official alerts: what the levels mean, who issues them, and where to find the original. Official warnings and local authorities always come first.
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Regional guides · Earthquakes
Earthquake alerts in California
How earthquake early warning and earthquake reports work in California, from ShakeAlert, MyShake and phone alerts to USGS, and what each can do.
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Regional guides · Wildfires
Wildfire alerts in California
Who issues wildfire alerts and evacuation orders in California, what Evacuation Warning and Order mean, and how to get county alerts, WEA and fire updates.