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How do we calculate cloud base?

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Edlina kalfabun created the topic: How do we calculate cloud base?

How do we calculate cloud base?
#1

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bobtait replied the topic: How do we calculate cloud base?

I'm not sure exactly what you want with this question. The pilot never needs to 'calculate' the cloud base, the Met man does that. If you mean how is the cloud base expressed, it depends on the forecast you're reading. A Graphical Area Forecast gives cloud base above sea-level and an aerodrome forecast (TAF) or (TTF), gives cloud base above ground level.

See also AIP GEN 3.5 para 3.7.1
#2

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Carello replied the topic: How do we calculate cloud base?

You can calculate the convective cloud base if you know the surface temp and dewpoint temperature.

Cloud Base in feet = (Air temperature at surface – dew point temperature at surface) x 400'

The calculated base will be the height above the surface observation.

If you grab an F160 you should be able to derive this formula for yourself.
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