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 blizzard is a storm that lasts 3 hours or more, with persistent winds/frequent gusts of 35 mph or more along with significant...
The term used for semi-stationary high-pressure centers such as the Azores and North Pacific Highs, which occur in the narrow...
A sudden and rapid flow of snow masses accumulated on the slopes of mountainous areas under the influence of gravity or a...
The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....
A cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...
The situation where there is no advection because the constant pressure surfaces and temperature surfaces in the atmosphere...
Nimbostratus clouds are thick, dark, gray clouds associated with rainy and gloomy days that block the Sun. These clouds,...
The horizontal transport of any feature within the atmosphere due to the movement of air (wind). This includes phenomena...
An anvil is a cloud mostly composed of ice particles. Otherwise known as a cumulonimbus cloud, an anvil has reached the stratospheric...
Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.