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 polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...
In a severe storm, with a swirling motion in its left rear quadrant, a vertically rotating column of air, often seen with...
Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...
A weather front formed when a cold front overtakes a warm front, lifting the warm air off the ground and resulting in a mix...
The formation of fog when warm and moist air passes over a cool or cold surface or, conversely, when cold air passes over...
Considerable cloudiness refers to weather conditions where a large portion of the sky is covered with clouds, but some clear...
Local winds that blow from slopes to peaks as a result of the heating of the top slopes without being affected by general...
The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.
An anvil is a cloud mostly composed of ice particles. Otherwise known as a cumulonimbus cloud, an anvil has reached the stratospheric...
A periodic cooling of sea surface temperatures in the central and eastern Pacific Ocean, often leading to altered global...