Скачать или смотреть "Private Pilot: Cloud Base Estimate" Cessna Flight - Aviation Tips

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Taken Wikipedia:

The cloud base can be estimated from surface measurements of air temperature and humidity by calculating the lifted condensation level. One method for doing this, used by the U.S. Federal Aviation Administration and often named after Tom Bradbury, is as follows:

1.) Find the difference between the surface temperature and the dew point. This value is known as the "spread".

2.) Divide the spread by 4.4 (if temperatures are in °F) or 2.5 (if temperatures are in °C), then multiply by 1000. This will give the altitude of the cloud base in feet above ground level.

3.) Add the results from step (2) to the field elevation to obtain the altitude of the cloud base above mean sea level.

More information: https://en.wikipedia.org/wiki/Cloud_base

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