The Spanish Armada owed its defeat in the 16 th century to the violent storm it encountered off the coast of Britain. A storm surge is the abnormal rise of the sea along a shore as a result of storm winds. Sky coverage is measured in eighths. Noctilucent clouds are thin, wavy, bluish-white clouds that are best seen at twilight in polar latitudes. Obstructions to Visibility, Mirages, etc.
Fog is made of small water droplets suspended in the air that reduces visibility.
Radiation fog is fog produced over land when radiation cooling reduces the air temperature to or below dew point. It is also known as ground fog or valley fog. A halo is a luminous ring around the sun or moon. It is formed when light is refracted as passes through the ice crystals suspended in the atmosphere. A contrail is a cirrus-like trail of condensed vapor often produced by jets flying at high altitudes.