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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The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.
Precipitation in the form of small balls or lumps of ice that form in thunderstorm updrafts and fall to the ground.
A low-pressure area with converging winds, rotating counterclockwise in the Northern Hemisphere and clockwise in the Southern...
A tropical cyclone with sustained winds of at least 74 miles per hour, characterized by a central eye, strong winds, and...
The heating of the Earth by the sun causes daily changes in both the direction and speed of the wind. During the day, ground...
A sudden and rapid flow of snow masses accumulated on the slopes of mountainous areas under the influence of gravity or a...
A periodic cooling of sea surface temperatures in the central and eastern Pacific Ocean, often leading to altered global...
A cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...
A sudden electrostatic discharge during a thunderstorm between electrically charged regions of a cloud, between clouds, or...
The mass of air surrounding the earth and bound to it more or less permanently by the earth's gravitational attraction.