What is Clear?
Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility. Clear sky. In meteorology, this term is also used when the cloud cover is less than 1/8 during the day or at the observation hour.
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A cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...
Any form of water - liquid or solid - that falls from the atmosphere to the Earth's surface, including rain, snow, sleet,...
A low-pressure area with converging winds, rotating counterclockwise in the Northern Hemisphere and clockwise in the Southern...
A rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.
Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.
A long, narrow region in the atmosphere that transport water vapor, like a river in the sky.
Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...
A cold core low is a low-pressure system where the coldest temperatures are found near the center. These systems are often...
A type of low-altitude cloud that forms in uniform layers, often covering the entire sky and producing overcast conditions.
A mass of very cold, dry air that mostly originates over the Arctic Ocean.