What the app shows you
Full FogCast score, fog type, chase-or-skip verdict, and 10-day outlook — all in the app.
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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 StoreMount Adams stands at 3,742 meters in the Gifford Pinchot National Forest in southern Washington, the second-highest peak in the state. Its massive glaciated bulk rises above the forested valleys and meadows of the Yakima and Klickitat drainages, and when fog fills those valleys on autumn mornings, the white volcano stands in stark relief above the mist — one of the great above-fog volcano views in the Cascades.
The Bird Lake and Takhlakh Lake areas at around 1,300 meters on the west and northwest flanks offer the most accessible and most photographed above-fog views, with the lake in the foreground and Adams rising through clearing mist. Horseshoe Meadows and the Divide Camp area give higher elevation perspectives on summit fog and lenticular cap clouds. The Yakama Nation side to the east is more remote but offers vast open views when valley fog fills the plateau below. September and October, before snow closes forest roads, are the prime months.
Mount Adams fog is almost always valley origin — cold air drains from the high slopes and pools in the forest floor valleys, reaching saturation in the early morning hours. The most photogenic conditions occur when fog fills only to about 1,100 meters elevation, leaving the lower flanks and lakes in fog while the summit and glaciers are brilliant in the clear pre-dawn sky. Light winds are essential — any sustained breeze above 15 km/h mixes the valley air and prevents fog formation.