Hazy skies are expected to linger over the North Bay for the next two days due to smoke from the Pickett Fire, prompting an air quality advisory.

The weather service issued a heat advisory Tuesday — the first one issued since late May — for Thursday through late Friday covering eastern Sonoma County and most of Napa County outside the valley. On Thursday, the weather service extended it through Saturday night and issued a new heat advisory just for Thursday for the North Bay valleys.

North Bay Interior Valleys and San Francisco Bay Shoreline are included in an updated heat advisory released by the National Weather Service on Thursday at 6:25 a.m. The advisory is valid between