Meteorology

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Windshear and microburst

What is windshear? Windshear is any variation of wind speed and/or direction from place to place, including updrafts and downdrafts. The stronger the change and/or the shorter the distance within which it occurs, the greater…

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What is RVR?

Runway visual range (RVR) is a highly accurate instrument-derived visibility measurement that represents the range at which the runway’s high-intensity lights can be seen in the direction of landing along the runway. Its readings are…


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What is the definition of CAVOK?

When the following conditions occur simultaneously: 1. Visibility equal or greater than 10 km 2. No clouds below 5000 ft or below the highest minimum sector safe altitude (MSA), whichever is the greater, and no…


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Weather Forecasts and Reports

The primary method of preflight meteorologic briefing for aircrew in most parts of the aviation world is self-briefing. This is done in one of two ways: 1. Using facilities, information, and documentation routinely available or…


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Temperature

Temperature is a measure of molecule agitation in a substance, which is represented as the hotness of a body. Therefore, temperature can be thought of as a measure of the hotness of a body. Factors…


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Latent Heat

Latent heat is the heat energy, measured in calories, absorbed or released when water changes from one state to another. There are three states of water: 1. Water vapor (gas) 2. Water liquid (cloud, mist,…


Icing

What is a deicing system? A deicing system is one in which ice is allowed to build up on a surface and is then removed, e.g., with pneumatic leading-edge boots. What is an anti-icing system?…