Why fog is hard to predict
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.
Dew Point Depression
When air temperature and dew point converge below 2°C, the air is near saturation. This is the single strongest fog predictor and the first thing FogCast checks.
Wind Speed
Fog needs calm air. Below 5 km/h is ideal. Above 15 km/h, fog disperses before it can pool in the valley. A standard weather app won't flag this combination.
Overnight Sky Clarity
Clear overnight skies let the ground cool rapidly, pushing surface temperatures toward the dew point. Counterintuitively, clouds overnight suppress radiation fog.
Temperature Trend
FogCast reads the overnight temperature arc. If temps are converging toward the dew point hour by hour, fog probability increases significantly by pre-dawn.
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Fog photography at Cades Cove
Cades Cove is a broad mountain valley surrounded by the ridges of the Great Smoky Mountains, and its open meadow geometry makes it one of the most reliable and most photographed fog photography locations in the eastern US. Cold air drains off the surrounding slopes overnight and pools in the flat cove floor, producing dense radiation fog that fills the valley while the ridges above remain clear.
The 18-kilometer loop road around the cove passes through open meadows, historic cabins and barns, and forest edges, all of which become dramatically atmospheric when fog fills the cove at dawn. The view from the loop road looking across the meadow toward the fog-shrouded tree line is one of the most classic Smoky Mountain compositions. White-tailed deer and occasionally black bears move through the fog in the early morning, adding wildlife to the scene.
Fall is peak season, from mid-October through November, combining foliage color with the most reliable fog. Spring also delivers consistent morning mist. The gate opens at sunrise and the loop road gets crowded quickly, so arriving at opening time is important for both fog and wildlife photography in calm conditions.
Frequently asked
Can I check FogCast on the website?
This page shows a preview of current conditions, including humidity, wind, temperature, and dew point. The full FogCast score, 7-day outlook, push notifications, and best shooting windows are available exclusively in the LightCast app for iOS.
Is FogCast free?
The current conditions preview on this page is free, no account needed. The full FogCast tool is in the LightCast Suite iOS app, which includes a 7-day free trial. After the trial it's $2.99/month, cancel anytime in the App Store.
Why use FogCast instead of checking humidity?
Humidity alone doesn't tell you whether photogenic fog is likely. High humidity with strong wind produces no fog at all. FogCast combines dew point depression, wind speed, overnight sky clarity, temperature trend, and visibility into a single score built specifically for fog photography planning.
What is FogCast's scoring scale?
FogCast scores fog conditions from 0 to 100. A score of 75 or above indicates dense fog is expected. 55 to 74 means fog is likely and worth chasing. 35 to 54 suggests patchy mist is possible. Below 35, conditions are unlikely to produce photogenic fog. The full score is available in the LightCast app.