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 weather system refers to the movement of warm and cold air across the globe, usually in a recurring pattern. Systems can...
The mass of air surrounding the earth and bound to it more or less permanently by the earth's gravitational attraction.
A tropical cyclone with sustained winds of at least 74 miles per hour, characterized by a central eye, strong winds, and...
A long, narrow region in the atmosphere that transport water vapor, like a river in the sky.
A scale for estimating wind speed based on observed conditions of the sea or land. It ranges from 0 (calm) to 12 (hurricane)...
Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...
A measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the...
The branch of science dealing with the laws of motion of air or other gases.
A narrow band of strong winds in the upper atmosphere, typically flowing from west to east and influencing weather patterns.
A measurement determined by the wave lengths and sea conditions caused by the effect of wind, and by the movement of tree...