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The common phrase "red sky at morning" is a line from an ancient rhyme often repeated with variants by mariners [1] and others: Red sky at night, sailors' delight. Red sky at morning, sailors take warning.
Sailors are taught if the sunrise is red to take warning. The day ahead will be dangerous. "Red Sky at night, Sailors delight; Red Sky in the morning, Sailor's take warning." It may also be said as; "Red at morning, Sailors warning; Red at night, Sailors delight," or "Red sky at night, Sailor's delight; Red sky at morn, Sailor be warned."
Above the ocean or a large lake, air is typically more humid than above land. When the humid air moves over cold land, it will form fog and precipitation. (To the east of the North American Great Lakes , this is a common phenomenon, and is known as the " lake effect .") [ 17 ] In northerly climates, ice fog may form when the temperature drops ...
When these high clouds progressively invade the sky and the barometric pressure begins to fall, precipitation associated with the disturbance is likely about 6 to 12 hours away. A thickening and lowering of cirrocumulus into middle-étage altostratus or altocumulus is a good sign that the warm front or low front has moved closer and it may ...
The clouds do not become that color; they are reflecting long and unscattered rays of sunlight, which are predominant at those hours. The effect is much like if a person were to shine a red spotlight on a white sheet. In combination with large, mature thunderheads this can produce blood-red clouds.
Clouds and potentially fog can form within a marine layer when the water-saturated air is cooled and reaches a humidity of 100%, where it will then condense and turn into water droplets. [3] Stratus and stratocumulus can form at the top of a marine layer in the presence of these conditions. A marine layer can often be dispersed by sufficiently ...
Yet, in ship tracks, the cloud seeding makes the drops so small that they can no longer easily merge to reach the size needed to escape. Since no drizzle comes out of the seeded clouds, the liquid water just keeps building in the cloud. This makes the cloud brighter and more reflective to incoming sunlight, especially in the near-infrared part ...
Pressure systems cause weather to be experienced locally. Low-pressure systems are associated with clouds and precipitation that minimize temperature changes throughout the day, whereas high-pressure systems normally associate with dry weather and mostly clear skies with larger diurnal temperature changes due to greater radiation at night and ...