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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Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...
The amount of radiation, heat, or light passing through or flowing from a unit area of a surface.
A prefix used in cloud nomenclature to describe middle-altitude clouds that form between 6,500 and 20,000 feet, such as altostratus...
A mass of very cold, dry air that mostly originates over the Arctic Ocean.
Convection is the vertical movement of air caused by temperature differences, where warm air rises and cool air sinks. It...
The heating of the Earth by the sun causes daily changes in both the direction and speed of the wind. During the day, ground...
The mass of air surrounding the earth and bound to it more or less permanently by the earth's gravitational attraction.
A sudden electrostatic discharge during a thunderstorm between electrically charged regions of a cloud, between clouds, or...
Weather conditions are the components that comprise the state of the atmosphere. The six main weather conditions are temperature,...
A cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...