but then a very strong system there will keepen. that will happen on thursday. as it does. friday and saturday, high pressure in the desert set which has been non-- desert which has been nonexistent for a long time, temperatures will be really coming up. overall, breezy to windy at time. strongest wind is on the coast and in some of the highest elevations. temperatures are com. a lot of 60s. but the five-day forecast and a few low to mid-70s today does have fall beginning tonight. this is it for summer. 8:09 p.m. it will be very cold sunny morning. very warm for the weekend, 90s. >> thank you. >>> more than a dozen federal and local agencies are participating in a security threat exercise today at the san francisco international airport. sfo's annual exercise began three days ago. members of different agencies are responding to a simulated incident to help prepare them for the possibility of a real threat. among the federal agencies participating with local authorities are the fbi, federal air marshals, the transportation security administration and the u.s. coast guard. >>