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 rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.
A weather front where two air masses meet but neither is strong enough to move the other, often resulting in prolonged periods...
A condition in which the stratification of the atmosphere depends on both air temperature and pressure, and where surfaces...
The mass of air surrounding the earth and bound to it more or less permanently by the earth's gravitational attraction.
A sudden and rapid flow of snow masses accumulated on the slopes of mountainous areas under the influence of gravity or a...
Temperature scale, abbreviated as °C, found by accepting the freezing point of water at one atmospheric pressure as zero...
The reflectance rate of a surface, indicating the amount of electromagnetic radiation reflected from the surface. It depends...
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 blizzard is a storm that lasts 3 hours or more, with persistent winds/frequent gusts of 35 mph or more along with significant...
A scale for estimating wind speed based on observed conditions of the sea or land. It ranges from 0 (calm) to 12 (hurricane)...