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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Precipitation in the form of small balls or lumps of ice that form in thunderstorm updrafts and fall to the ground.
The upward movement of air caused by a topographic barrier, such as a mountain, which can lead to cloud formation and precipitation.
A mass of very cold, dry air that mostly originates over the Arctic Ocean.
A middle cloud type within the B family in the international cloud classification. These clouds consist of water droplets...
A cloud that develops from Cirrus, completely or partially covering the sky, creating a halo effect, thin, sheet-like, milky...
A scale for estimating wind speed based on observed conditions of the sea or land. It ranges from 0 (calm) to 12 (hurricane)...
Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.
A strong wind typically ranging from 34 to 40 knots (39 to 46 miles per hour) and often associated with rough seas and stormy...
An elongated area of relatively low atmospheric pressure, often associated with unsettled weather conditions like storms...
The expected rate of temperature decrease in an adiabatically rising air parcel when there is no heat exchange with the environment....