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 tropical cyclone, also called a hurricane, is a severe tropical storm with wind speeds in excess of 74 mph. Known as a...
The trapping of heat in the Earth's atmosphere due to greenhouse gases, such as carbon dioxide and methane, which allows...
A drainage wind that flows downhill due to gravity, often associated with cold air descending from elevated regions.
Although it is also used for light winds, it is the general name given to the daily cyclical winds that occur mostly between...
An instrument used to measure the speed, force, and sometimes the direction of the wind. It can be cup or pressure tube anemometers....
Any form of water - liquid or solid - that falls from the atmosphere to the Earth's surface, including rain, snow, sleet,...
The formation of ice crystals on surfaces when the temperature drops below freezing, typically overnight, causing potential...
A very cold high pressure that originates over the Arctic Ocean.
A scale for estimating wind speed based on observed conditions of the sea or land. It ranges from 0 (calm) to 12 (hurricane)...
The horizontal transport of any feature within the atmosphere due to the movement of air (wind). This includes phenomena...