Gianna wrote:


There is a nice item about the Föhn effect he

http://www.bbc.co.uk/weather/features/fohn_effect.shtml


--
Gianna

The explanation of the föhn is not really adequate. The air
in the lee of the mountains has mostly *not* risen, condensed out its
moisture and descended again, but comes from a higher level to the
windward of the mountains and descends in the lee. The simple
explanation given cannot explain the high temperatures and low
humidities experienced, at least in most cases. No-one is going to
convince me that an airstream climbs up the Alps and then drops down
again. Air doesn't like going uphill unless very unstable, in which
case it wouldn't descend the other side.

Tudor Hughes, Warlingham, Surrey