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San Mateo County Coastside To Test Sirens Wednesday Morning
The sirens are intended to be heard outdoors in high-risk areas.

SAN MATEO COUNTY, CA — San Mateo County Coastside is testing its notification sirens on Wednesday at 10 a.m.
The sirens are intended to be heard outdoors in high-risk areas and won't be heard in parts of the county coast where topography and high elevation mitigates tsunami threats.
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