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 Bryce Canyon
Bryce Canyon sits at 2,400 to 2,700 meters on the edge of the Paunsaugunt Plateau, and its hoodoos, the densely packed orange and white spires that fill the amphitheaters below the rim, take on a completely different character when low cloud and fog move through. The hoodoos emerge from and disappear into the mist as it shifts, creating an almost surreal landscape of spires dissolving at their tips.
Sunrise Point and Bryce Point are the most dramatic rim overlooks for fog photography. When cloud sits inside the amphitheater at hoodoo height rather than above or below, the effect is most striking: individual spires are visible in the foreground while the middle distance disappears into grey, giving the amphitheater an appearance of infinite depth. Winter snow combined with low cloud and hoodoos is among the most photogenic winter conditions in the American Southwest.
Winter and early spring are the most reliable fog seasons at Bryce, from November through March, when orographic cloud and light snow events bring low visibility to the rim. The high elevation means Bryce is considerably colder than lower Utah terrain, and overnight temperatures drop well below freezing for much of the year.
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.