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 StoreDevils Tower is a 264-meter columnar phonolite monolith rising from the Belle Fourche River valley in northeastern Wyoming — one of the most striking geological formations in North America. The tower sits at roughly 1,560 meters while the surrounding prairie and river valley floor is at 1,270 meters, and on the right autumn morning, radiation fog fills the valley and the lower ponderosa pine forest around the tower's base while the columns above emerge clear. The effect is of a massive geological pillar floating above white mist.
The Joyner Ridge Trail and the south side viewpoints offer the best fog photography angles — looking across the fog-filled Belle Fourche lowlands with the tower rising above. The approach road from the east, descending into the river valley, can be spectacular when fog is at its densest. Autumn, September through November, is the most reliable fog season, when temperature inversions in the Wyoming high plains produce strong radiation fog events. The tower is most photogenic with fog when early morning alpenglow hits the columns above the mist layer.
Devils Tower fog forms in the Belle Fourche River valley on clear, calm autumn nights when cold air pools in the broad river floodplain. The tower itself is typically above the fog ceiling on strong fog mornings. Check valley dew point the evening before — if overnight temperatures are forecast to drop within 2°C of dew point at the lower elevations with calm winds, the south approach viewpoints are worth a pre-dawn visit.