weathervane.jpgShowers are expected to sweep across the Bay Area today, and the forecast is also calling for a slight chance of thunderstorms that are capable of producing hail. Highs in the mid 50s and west winds of 10 to 20 mph are expected.

Showers will likely continue throughout the night, when lows near 40 and southwest winds around 10 to 20 mph are anticipated.

More showers are expected Thursday, with coastal and inland highs in the upper 40s and lower 50s predicted. South winds of 10 to 20 mph are also expected.

A surf advisory is also scheduled to go into effect at 7 a.m. Wednesday due to waves that could be up to 20 feet high, the National Weather Service said.

The wave heights will build between 14 and 17 feet and break at about 20 feet, with the highest waves arriving around sunrise Wednesday.

High tide will occur at mid-morning Wednesday and then just before midnight, with the surf advisory expected to be lifted at 2 a.m. Thursday.

The large swells, high tidal cycles, and onshore winds will likely create a dangerous near-shore environment, the weather service said.

Anyone visiting local beaches should use caution and expect rip currents in the surf zone.

Minor coastal flooding is also possible, particularly during high tide.

The winds are predicted to turn southerly on Thursday, which should bring breaking wave heights back down below 15 feet, the weather service said.

The wind and surf advisories were issued for San Francisco, Santa Cruz, San Mateo, Marin, Monterey, Contra Costa, Napa, Sonoma, Santa Clara and Alameda counties.

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