Morning Fog in Abrantes, Portugal
May 10, 2015
Photographer: Ana Filipa Scarpa
Summary Authors: Ana Filipa Scarpa; Jim Foster
The photo above shows a foggy valley in Abrantes, Portugal, as viewed from a low slope not far away. It was taken at approximately 7:30 the morning of February 26, 2015. Clear skies overnight allowed the ground to cool to the dew point temperature -- there was a net loss of heat. When this picture was snapped nearly all of the morning mist had already evaporated, revealing blue skies. However, the densest fog layer lingered in the valley bottom where during the early morning hours the lowest air temperatures are typically found. Valley fog or radiation fog occurs most often during the part of the year when nights are as long as, or longer than, the days.
Photo details: Camera Model: NIKON D3; Lens: 24.0-70.0 mm f/2.8; Focal Length: 55mm (35mm equivalent: 55mm); Aperture: ƒ/8.0; Exposure Time: 0.0013 s (1/800); ISO equiv: 800; Software: Adobe Photoshop CS5 Windows.