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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Although it is also used for light winds, it is the general name given to the daily cyclical winds that occur mostly between...
Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.
Ice forms on the surface of highways in a very thin layer that is difficult to distinguish from the color of the asphalt...
A very cold high pressure that originates over the Arctic Ocean.
The mass of air surrounding the earth and bound to it more or less permanently by the earth's gravitational attraction.
The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.
The reflectance rate of a surface, indicating the amount of electromagnetic radiation reflected from the surface. It depends...
A tropical cyclone, also called a hurricane, is a severe tropical storm with wind speeds in excess of 74 mph. Known as a...
Precipitation in the form of small balls or lumps of ice that form in thunderstorm updrafts and fall to the ground.
In a severe storm, with a swirling motion in its left rear quadrant, a vertically rotating column of air, often seen with...