. >> reporter: anybody twhanted to have their see can call this number here. this tree could come down as early as the end of may. >>> the mayor of san francisco -- around san francisco, it's been kind of muggy and sticky out there. >> we've watched the clouds coming in. it's much warmer and if that's it for the heat, though. temperatures are trimming down. clouds are coming in. the light sprinkles are trying to show up. we have activity down toward santa cruz. we'll be checking into that. as we go forward, we're looking for more clouds tonight. and here you see, the system to the north. but this last hour, so you see this area undercutting here, that's where the chance of sprinkle is coming from tonight. as we go into saturday, we're going to have cold air and warm air link up. that system will become a full- fledged winter weather system. so cooler air masses, and the weekend going to be wet. we'll show you the computer model. here's 2:00 a.m. here's that light chance of sprinkles. this is a frontal system. it's not nothing to it. it slides through and will