Tucked behind a hill in Sebastopol, Calif., with a 5,400-square-foot cave that holds some 500 barrels of wine, DRNK Wines exudes the quiet charm that a visitor might expect. But the grapes in some of the wines that are sold here are under a growing threat — which is why DRNK’s winemaker, Ryan Kunde, can sometimes be seen in various vineyards testing his fleet of drones. Their mission? To one day collect aerial images that will help determine the vines’ vigor, ripeness, flavor and harvest dates, which due to rising soil temperatures have inched up in Sonoma County over the past few years.

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