SAN DIEGO -- Weather conditions in San Diego County are expected to be cloudy and breezy Friday with a chance of scattered showers throughout the day, especially during the morning and later Friday night, according to 10News Weathercaster Robert Santos. Only a few hundredths of an inch of rain are expected to fall, he said. Strong winds will blow through the mountains and deserts of San Diego County Friday and over coastal waters, creating perilous boating conditions, National Weather Service forecasters said.A strong onshore flow will produce gusty winds in the mountains and deserts before an upper level trough brings even stronger winds late Friday afternoon through Friday night, according to the National Weather Service. The agency estimates winds will occasionally be gusting over 60 miles per hour Friday night.A wind advisory will be in effect in the mountains and deserts until 2 p.m., when a more serious high wind warning goes into effect. The high wind warning is set to expire at 4 a.m. Saturday.The Weather Service said some of the strongest winds will be along Interstate 8, from Pine Valley to the Imperial County line, which could be problematical for motorists in high-profile vehicles. Visibility could be one mile or less due to blowing dust and sand, and motorists were urged to watch out for downed trees and tree limbs.Strong winds are also expected over coastal waters, prompting the Weather Service to schedule a small craft advisory from 3 p.m. Friday to 8 a.m. Saturday.During the period covered by the small craft advisory, boaters can expect gusty west-to-northwest winds of 15 to 25 knots, with frequent gusts of 25 to 30 knots, according to the Weather Service."The gusty winds and steep wind waves will cause difficult navigating conditions for small craft. Steep waves have the potential to capsize small craft," according to an NWS advisory.Santos said that Sunday and Memorial Day Monday should be sunnier and warmer with coastal temperatures in the upper 60s and inland temperatures in the low to mid 70s.