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 StoreJiuzhaigou Valley is a UNESCO World Heritage Site in Sichuan Province, China — a series of glacial valley lakes at altitudes between 2,000 and 3,100 meters in the Min Mountains of the Tibetan Plateau edge. The lakes are famous worldwide for their extraordinary colors, from deep sapphire to turquoise to jade green, produced by mineral-rich spring water and algae. When autumn fog fills the valley between the multicolored lakes and the surrounding pine and fir forest blazes with fall color, Jiuzhaigou becomes one of the most visually intense landscapes on earth.
Nuorilang Waterfall and the Five Flower Lake are the most visited fog photography locations. The lake boardwalks give lake-level perspectives through morning mist. Arrow Bamboo Lake and Panda Lake further up the valley are higher elevation and often above the main inversion when the lower lakes are fogged. The valley's north-south orientation means the lower south-facing lakes get sun earlier, burning the fog; the upper north-facing lakes hold fog significantly longer. Mid-October is the peak week when autumn color and morning fog combine most dramatically.
Jiuzhaigou fog forms by cold-air drainage from the high surrounding mountains into the lake-filled valley floor. The lakes provide continuous evaporation moisture, and on clear calm nights when temperatures at valley level drop below 5°C, dense lake surface fog forms by pre-dawn. The fog is often thin enough that the lake colors remain visible through it — a soft turquoise glow through white mist is the visual signature of Jiuzhaigou fog photography. The morning fog typically clears from south to north as the sun climbs the valley walls.