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 mass of very cold, dry air that mostly originates over the Arctic Ocean.
Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...
A deviation from the normal or expected value in atmospheric or climatic conditions, often used in meteorology to identify...
An instrument that continuously records atmospheric pressure over time. It uses a barometer to measure pressure and creates...
The branch of science dealing with the laws of motion of air or other gases.
The state of the atmosphere when it contains the maximum amount of water vapor possible at a given temperature and pressure.
A cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...
A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...
A periodic cooling of sea surface temperatures in the central and eastern Pacific Ocean, often leading to altered global...
A weather watch means there is a risk of weather hazards in the near future, which could pose a threat to life/property....