Vineyards across western North Carolina are at risk as a late-season frost advisory has been issued for Buncombe County and surrounding areas. The National Weather Service forecasts temperatures will dip into the low 30s overnight, a threshold that could damage the delicate buds emerging on grapevines, according to agricultural experts. Local growers are scrambling to protect their crops, but the extent of potential damage remains uncertain. The frost advisory, in effect from 1 a.m. to 9 a.m. Tu