weather August 18, 2021 11:57 pm Jeff's Forecast: Unhealthy Smoky Air Returns Chief Meteorologist Jeff Ranieri has the latest on the smoky air and when air quality could improve in your 7 day Microclimate Forecast. US & World Videos 1:30 Watch: Crowds celebrate Carnaval San Francisco 1:22 Thousands flock to San Francisco's Mission District to celebrate Carnaval 0:41 Police investigate after motorcyclist shoots at car along I-280 in San Mateo County 2:32 Cinthia's forecast: Sunshine, warming ahead 1:01 Steph Curry's BottleRock Napa Valley appearance with Bradley Cooper draws large crowd