Frosts and floods again in the Bay Area Weather Forecast

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Clear skies woke up in parts of the Bay Area with frosted roofs and temperatures in the 30s on Saturday morning, but flooding is forecast.

Royal tides will hit the Bay Area through Monday, bringing a coastal flood warning into effect.

Marina is one of the most vulnerable areas. The county is bracing for more possible flooding this weekend as tides along the coast are expected to be exceptionally high, County Commissioner Stephanie Moulton-Peters said.

Biennial high tides, known colloquially as royal tides, have been known to cause flooding of coastal communities and low-lying roads in the Marina, road closures, traffic congestion and, in some cases, flooding of homes or businesses.

The National Oceanic and Atmospheric Administration (NOAA) says Saturday and Sunday high tides could cause flooding. These high tides are seasonal and unrelated to recent storms, the county said.

Tides are associated with the Moon, and weekend tides coincide with the new moon and can reach over 7 feet, according to NOAA. The highest predicted tides will be at Point San Quentin, reaching 7.08 feet by 11 am Saturday.

Moulton-Peters advised residents to allocate extra travel time and avoid driving on still water.

Areas prone to high tide flooding include the San Rafael Chinese Camp area and Manzanita Park and the Mill Valley Amusement District.

Icy roads are also a concern. The National Weather Service has issued a night frost warning for parts of the North and East Bays as far as the upper Salinas Valley, with some areas predicted to be between 28 and 32 degrees. The warning is due to expire at 11 am Saturday.

In addition to flooding and frost, Saturday’s weather forecast for much of San Francisco Bay promises sunny skies with highs in the 50s to 60s. Overnight lows will range from 30 to 40. The forecast for Saturday night is partly cloudy, mostly clear in the East Bay, with lows in the 30s and 40s.

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