Northern California was under a rare and brief tsunami warning alert Thursday that tested local emergency notification systems after a 7.0 magnitude earthquake shook part of the state.

County officials announced Friday they are overhauling their emergency alert system after residents across the Los Angeles area continued to receive erroneous emergency alerts that urged them to ...

Readers report seeing these alerts without Cupertino saved. There goes that theory. Might just be a bug. You may have received an Excessive Heat Warning on your iPhone today even if you’re ...

While some sound similar, each alert issued by local National Weather Service offices signals different winter conditions. Each office knows the local area and will issue warnings, watches or ...