Mistgale

A mistgale is a small, localized storm that forms primarily in the ancient forests of northern Avistan (particularly in Ustalav), but can also arise near graveyards or ruins. They form when fog rises from the ground at dusk to form swirling clouds, and can be from 10 feet to up to a mile in diameter. Mistgales are a bane to travelers, who often find their sight blocked and their clothes soaked by this strange weather phenomenon.