Mike Tullett wrote in message ...

:On Tue, 27 Jul 2004 22:27:37 +0300, Yannis wrote in


: So, can there be a Foehn effect without clouds over the hills? I thought
the
: Foehn effect was due to the descending air (downwind side of the hills)
: being heated at the dry adiabatic rate, rather than the moist one, at
which
: it cools while ascending at the windprone side of the hill.

:Yes, that is often the text book explantion of the Foehn, but it can happen
:in entirely clear air. One way would be if dry/warm air above an inversion
somewhere near mountain top height) is brought down to low levels on the
:lee side.

Faro on Tuesday 37.6°C - Monday night min. 26.3°C
http://weather.noaa.gov/weather/current/LPFR.html

Interesting to see the marked effect on temperature and humidity of small
shifts in the wind.

09z: 33°C and DP 6°C; 10z: 30°C and DP 16°C as the wind backs to WSW and
presumably introduces air from over the sea.

16z: 32°C and DP 16°C; 17z: 36°C and DP 4°C as the wind veers to the NW
again.

Cordoba 40.6°C is the only station in Spain listed in the 18z SYNOPs to
exceed 40°C on Tuesday.

Perhaps Keith Harris near Alicante will be finding the heat more tolerable
there - Alicante 31.6°C on Tuesday and Monday night minimum 20.0°C.

Colin Youngs
Brussels