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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Ball lightning appears during thunderstorms, taking the shape of glowing, electric orbs in the sky. It can appear in a variety...
Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.
A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...
The branch of science dealing with the laws of motion of air or other gases.
Conduction is the transfer of heat or electricity through a material without the material itself moving. This occurs when...
A scale for estimating wind speed based on observed conditions of the sea or land. It ranges from 0 (calm) to 12 (hurricane)...
An instrument that continuously records atmospheric pressure over time. It uses a barometer to measure pressure and creates...
Although it is also used for light winds, it is the general name given to the daily cyclical winds that occur mostly between...
A measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the...
A long, narrow region in the atmosphere that transport water vapor, like a river in the sky.