SAN FRANCISCO (KRON) -- The National Weather Service advises Bay Area beachgoers of sneaker waves and rip currents from Monday to Wednesday evening.  NWS defines sneaker waves as potentially deadly waves that surge further up the beach than expected, overtaking the unaware. Photo: National Weather Service World Championship Pumpkin Weigh-Off proves to be a massive contest The weather service forecasts hazardous conditions, including elevated winds, sneaker waves and rip currents, are expected to develop along the San Francisco Bay Area and Central Coast.  The National Weather Service suggests not being on jetties, keeping your eyes on kids and pets and never turning your back on the ocean.