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 cold core low is a low-pressure system where the coldest temperatures are found near the center. These systems are often...
Thermodynamic changes occurring within a system without any exchange of heat with the surroundings. In the atmosphere, changes...
A type of cloud consisting mostly of small particles such as ice particles.
An image on the weather radar that is convex to the direction of movement and resembles an arc shape, caused by mesoscale...
A measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the...
A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...
A long, narrow region in the atmosphere that transport water vapor, like a river in the sky.
Cloud condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...
Ball lightning appears during thunderstorms, taking the shape of glowing, electric orbs in the sky. It can appear in a variety...
The formation of ice crystals on surfaces when the temperature drops below freezing, typically overnight, causing potential...