What the app shows you
Full FogCast score, fog type, chase-or-skip verdict, and 10-day outlook — all in the app.
Get LightCast Suite on iOS
Know before you drive: FogCast checks the conditions that produce photogenic fog
Get more than a snapshot of current conditions. The LightCast app unlocks everything to plan ahead
Humidity alone isn't enough. Wind alone isn't enough. Cloud cover alone isn't enough. Photogenic valley fog requires several conditions to line up at once, and most weather apps don't read them together.
Set a FogCast threshold once. The app will alert you when conditions at your saved locations look promising, so you're not manually checking at 4am.
Don't waste a sunrise drive. Check FogCast before you leave.
Download on the App StoreThe Great Smoky Mountains get their name from the blue-grey mist that rises from the dense forests and fills the valleys year-round. The park is one of the most biodiverse in North America and its heavy tree cover releases moisture continuously, producing the orographic fog and low cloud that gives the mountains their characteristic hazy appearance.
Clingmans Dome is the highest point in the Smokies and on foggy mornings the observation tower rises above a sea of cloud, with ridgelines emerging from the mist in layers. Cades Cove is the most photographed valley, with open meadows and historic structures surrounded by fog-draped treelines at sunrise. The Morton Overlook and Foothills Parkway pullouts offer classic layered ridge compositions.
Fall is the best season, combining peak foliage color with the most reliable morning fog from October through November. Spring also produces consistent fog. The pre-dawn to 9am window is the most productive, before valley fog burns off as temperatures rise.