What is Heat Index?
A measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the 'apparent temperature.'
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A small, intense downdraft that produces damaging winds at the surface, typically lasting a few minutes and often associated...
A rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.
A tropical cyclone with sustained winds of at least 74 miles per hour, characterized by a central eye, strong winds, and...
A sudden electrostatic discharge during a thunderstorm between electrically charged regions of a cloud, between clouds, or...
An instrument for measuring atmospheric pressure.
Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility....
A mass of very cold, dry air that mostly originates over the Arctic Ocean.
Bright and dark rays with changing colors and contrast in the sky. These rays become visible due to the reflection of atmospheric...
A thermodynamic change process in the system without any exchange of heat or transfer of energy between systems. This process...
A thin, white cloud layer that is intertwined or separate, arranged in regular order, and does not cast a shadow.