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-   -   Foehn wind (https://www.pprune.org/private-flying/582767-foehn-wind.html)

gerardflyagain 9th Aug 2016 20:59

Foehn wind
 
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Can anyone explain why the rate of dry warming jumps to 2 degrees per 200m at 2800m?

Isn't the dry adiabatic lapse rate a consistent 1.33c per 200m?

oggers 10th Aug 2016 08:55


Can anyone explain why the rate of dry warming jumps to 2 degrees per 200m at 2800m? Isn't the dry adiabatic lapse rate a consistent 1.33c per 200m?
The DALR is 2º/200m. 1.33º/200m is the 'standard' lapse rate.

gerardflyagain 10th Aug 2016 16:43

So why does it increase at a rate of 1º/200m from the top on the right 4400m? Surely this is the DLR as well (since the air is dry) and the DLR should remain consistent?

oggers 10th Aug 2016 19:17

What he said ^^^^

foxmoth 11th Aug 2016 07:07

Your last thread had the lapse rates in imperial, studying in both will not help, keep to what the exams are in (I presume they are not in both!).

Maoraigh1 11th Aug 2016 20:43

Altitude in feet, speed in knots, distance in nautical miles, runway length in metres, temp in Celsius? And C of G calculations?

foxmoth 11th Aug 2016 23:54

When I said not in both I really meant for any particular subject, yes conversions are actually part of the sylabus, but I would think lapse rates are only tested in one regime!

gerardflyagain 12th Aug 2016 21:19

Thanks foxmoth. The bit I hadn't realised was that it is still saturated for a while on the leeward side!

I wasn't looking to study in both, but I wanted a video to help understand, and that was the measurement they used.

foxmoth 14th Aug 2016 11:17


Thanks foxmoth. The bit I hadn't realised was that it is still saturated for a while on the leeward side!
Correct, though of course containing less moisture as it has dropped some as precipitation as it goes over the mountains and is why it is a "warm" wind.


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