T-0 Forecast: The subtropical ridge will be the dominant feature tomorrow with the marine layer influence present over the range. Cooling overnight and sustained northwesterly flow will allow the marine layer to move in over the range and linger on the coastal areas, bringing low shallow stratus and fog through the count. By T-0, the marine layer will break out, the stratus will be clearing out and visibility restrictions lifted. Winds will be onshore through the count with T-0 winds out of the west- northwest at 10 - 15 knots. Temperatures will range from 63 - 68F and max upper-level winds will be from the southwest at 50 knots from 34,000 to 36,000 feet. The overall POV will be 0% with no constraints of concern.
L-1 Day Forecast – 23 August 2017:T-0 Forecast: A low pressure region has moved into the central coast and will pass over the range during the countdown. The impact of this low will lift and thicken the marine layer, while keeping winds light at the surface. This elevated layer will persist through the count with cloud bases at T-0 being 800ft. Winds will be out of the northwest through the count with T-0 winds out of the northwest at 10 - 15 knots. Temperatures will range from 67 - 72F and max upper-level winds will be from the west at 45 knots from 36,000 to 38,000 feet. Radio Blackout Indices and Proton Flux are currently at background levels. The overall POV will be 10% with Ground Winds being the constraint of concern.