Firefighters battling the Pickett Fire in California Wine Country are holding the line on acreage and continuing to increase containment with the help of favorable weather conditions, Cal Fire reported.

The fire in Napa County near Calistoga has been burning since Aug. 21, threatening a number of vineyards and wineries within the evacuation zones. While the footprint of the fire has remained stable, smoke from the fire could impact the area's grape harvest .

The overnight marine layer of low clouds and fog moving in from the Pacific Ocean — in which cooler, moist air is trapped near the surface by the warmer, drier air above it — is helping crews in lower elevations, Cal Fire said in a Wednesday status report on the fire .

A Cal Fire helicopter drops water on the Pickett Fire, Aug

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