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 type of cloud consisting mostly of small particles such as ice particles.
The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.
The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....
Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...
A drainage wind that flows downhill due to gravity, often associated with cold air descending from elevated regions.
A tropical cyclone, also called a hurricane, is a severe tropical storm with wind speeds in excess of 74 mph. Known as a...
A deviation from the normal or expected value in atmospheric or climatic conditions, often used in meteorology to identify...
The formation of ice crystals on surfaces when the temperature drops below freezing, typically overnight, causing potential...
A thermodynamic change process in the system without any exchange of heat or transfer of energy between systems. This process...
A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...