What is Arctic Air?
A mass of very cold, dry air that mostly originates over the Arctic Ocean.
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Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility....
A cloud of irregular appearance, composed of irregular cloud fragments.
A rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.
The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....
The formation of ice crystals on surfaces when the temperature drops below freezing, typically overnight, causing potential...
The term used for semi-stationary high-pressure centers such as the Azores and North Pacific Highs, which occur in the narrow...
Ice forms on the surface of highways in a very thin layer that is difficult to distinguish from the color of the asphalt...
A measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the...
The trapping of heat in the Earth's atmosphere due to greenhouse gases, such as carbon dioxide and methane, which allows...
A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...