The Fog Rolls In

October 02, 2014

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Photographer: Ana Filipa Scarpa
Summary Authors: Ana Filipa Scarpa; Jim Foster
Most every day this past August a fog that developed during the early morning hours off the coast of Portugal, near Arrifana (Algarve), would swallow the shore area for several hours before dissipating. On occasion, the fog would appear twice in the same day -- its second visit would occur in the early afternoon. I snapped the photo above about 7:00 a.m. This spring and summer, the Atlantic Ocean off Portugal was particularly cool. Typically, the water temperature in Algarve is quite warm in late summer. Algarve has perhaps the warmest ocean water in all of Portugal, but this year the water remained comparatively cool. As a result, the Atlantic off Portugal was similar to the Pacific off San Francisco. Westerly winds moved cooler air ashore replacing the normally warmer surface air. The fog that formed was part of a marine layer -- cool, moist air positioned between the ocean water and a layer of warmer air just above it. Photo taken on August 26, 2014.
Photo Details: Camera: NIKON D3; Lens: 24.0-70.0 mm f/2.8; Focal Length: 70mm (35mm equivalent: 70mm); Focus Distance: Infinite; Aperture: f/6.3; Exposure Time: 0.013 s (1/80); ISO equiv: 100; Software: Adobe Photoshop CS5 Windows.