The centers of the mid level and upper level ridges previously mentioned are expected to cross into southern Arizona during the late morning on Saturday. Southwesterly winds in the upper levels will bring moisture to the region, however the models (especially the short range models) indicate most of the moisture will be located further to the north, around the Bay area. The result will be mostly sunny skies with some light cloud cover possible through the day.
As the upper level ridge continues eastward on Sunday, the band of moisture (extending to the southwest) will also move eastward, passing over the track throughout the morning. As a result, some heavier cloud cover is expected to start the race, but conditions are likely to clear in the late morning to mid-afternoon. Stronger surface winds off the coast will cause winds to pick up slightly during the day with temperatures remaining in the mid to upper 60's.