Cloud Base Height

Cloud base height represents the altitude above ground level where clouds form, fundamentally determining how clouds appear in photographs and whether they'll create fog, atmospheric layers, or elevated sky drama. Unlike cloud coverage which measures sky obscuration, cloud base height tells photographers where clouds exist in three-dimensional space, enabling precise planning of viewpoint elevations relative to cloud layers.

Cloud bases below 100 meters manifest as dense fog that reduces visibility and creates moody, mysterious landscape conditions. Bases between 100-300 meters form the low-hanging mist and fog layers that valley photographers target, where proper viewpoint elevation allows shooting down into fog-filled valleys while standing above clouds in clear air. Cloud bases at 300-1000 meters create low stratus layers that produce overcast lighting but may clear valley floors in mountainous terrain, while bases at 1000-2000 meters form the mid-level clouds ideal for catching sunrise and sunset colors without blocking low-angle horizon light. Very high cloud bases above 4000 meters indicate thin cirrus clouds that barely affect photography lighting.

Cloud base height changes throughout the day: morning fog with bases below 100m lifts to 300-500m as the sun heats the surface, potentially lifting further to 1000m or dissipating entirely by midday. Understanding base height evolution allows photographers to time shoots for optimal conditions, capturing fog layers at dawn before they lift beyond photogenic heights. In mountainous terrain, cloud base height relative to peak and valley elevations determines which areas remain clear and which become engulfed, enabling photographers to choose viewpoints that look down on clouds rather than shooting from within them. PhotoWeather monitors cloud base height trends to predict fog formation and dissipation timing, forecast opportunities to shoot above cloud layers from elevated viewpoints, and alert photographers to the optimal balance of low cloud bases creating atmosphere while maintaining sufficient visibility for foreground detail. For fog photography targeting mist layers, seek cloud bases 100-400m above valley floors. For golden hour clouds that catch light, prefer bases 800-2000m. For clear ground with high sky clouds, look for bases above 3000m.