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 drainage wind that flows downhill due to gravity, often associated with cold air descending from elevated regions.
A periodic cooling of sea surface temperatures in the central and eastern Pacific Ocean, often leading to altered global...
A deviation from the normal or expected value in atmospheric or climatic conditions, often used in meteorology to identify...
The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.
Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...
Coastal flooding occurs when water from the ocean, sea, or large lakes inundates land areas along the coast, usually due...
A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...
Bright and dark rays with changing colors and contrast in the sky. These rays become visible due to the reflection of atmospheric...
Precipitation in the form of small balls or lumps of ice that form in thunderstorm updrafts and fall to the ground.
A cold core high is a high-pressure system with cold air at its center. These systems are typically associated with clear...