SAN FRANCISCO (AP) — Forecasters advised of potential minor coastal flooding Monday morning along low-lying areas of the California coast due to astronomical high tides.

Advisories were issued by the National Weather Service for coastal areas north and south of San Francisco and Monterey bays and the on the Big Sur coast. Forecasters said the advisories might be extended through Tuesday morning’s high tide.

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In Southern California, a beach hazards statement was issued for the Orange and San Diego county coasts for Monday and Tuesday mornings.

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Astronomical high tides occur due to the alignment of the pull between the sun, moon and Earth.

Sometimes referred to as “King Tides,” they occur naturally and are predictable.

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The California Coastal Commission has a King Tides Project website to explain the phenomenon.