Typical weather conditions in Southern California are dominated by the meso-scale sea breeze. The Pacific sub-tropical high-pressure system lying offshore maintains a strong and steady subsidence inversion along the coast. Upper-level air within this system subsides, is compressed, and progressively warmed, but air in contact with the sea becomes progressively cooler, thus strengthening the inversion. Colder sea surface temperatures, thanks to the south-going California current, maintain this ever-present marine layer and reinforce the stability of the lower 2000 feet. Synoptic (large scale) winds therefore typically play a lesser role, allowing the sea breeze to dominate.