Brussels on Sunday 25 July

Mostly cloudy morning with a few bright intervals. Overcast after midday
with drizzle for a short while. Broken cloud from mid-afternoon with
sunshine at times but cloudy again in the evening. Cooler than recently -
light wind from around west.

Brussels Uccle 20.1°C - overnight minimum 13.2°C.
Brussels Airport 19.9°C - overnight minimum 13.6°C - and 0.1 mm rain.

Graph http://www.irceline.be/cgi-bin/metevol.ksh?r012

Brussels Airport http://weather.noaa.gov/weather/current/EBBR.html

Colin Youngs
Brussels

Lanzarote 42.9°c today.

Keith (Southend)

On Sun, 25 Jul 2004 21:32:42 +0200, "Colin Youngs"
wrote:

Brussels on Sunday 25 July

Mostly cloudy morning with a few bright intervals. Overcast after midday
with drizzle for a short while. Broken cloud from mid-afternoon with
sunshine at times but cloudy again in the evening. Cooler than recently -
light wind from around west.

Brussels Uccle 20.1°C - overnight minimum 13.2°C.
Brussels Airport 19.9°C - overnight minimum 13.6°C - and 0.1 mm rain.

Graph http://www.irceline.be/cgi-bin/metevol.ksh?r012

Brussels Airport http://weather.noaa.gov/weather/current/EBBR.html

Colin Youngs
Brussels

Keith,

How about a day trip to Faro...

LPFR 251530Z 36014KT 300V030 CAVOK 45/M07 Q1014 =


mind pretty dry air!

Phil

The 18:00 synop for Faro had a maximum temp of 44.3°c with the RH at
16%. The same temp as Seville in Spain.

Keith (Southend)

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On Sun, 25 Jul 2004 21:42:09 +0100, "Phil Layton"
wrote:

Keith,

How about a day trip to Faro...

LPFR 251530Z 36014KT 300V030 CAVOK 45/M07 Q1014 =


mind pretty dry air!

Phil

Phil Layton wrote in message ...
:How about a day trip to Faro...
:LPFR 251530Z 36014KT 300V030 CAVOK 45/M07 Q1014 =
:mind pretty dry air!

Extraordinary http://weather.noaa.gov/weather/current/LPFR.html

RH 3% at 14.00 and 15.00 UTC ! Faro max. 44.3°C and min. 26.9°C.

Other hot places in Portugal on Sunday - Portalegre 40.3°C, Castelo
Branco 40.8°C, Beja 41.3°C, Evora 42.2°C.

Spain - Ciudad Real 40.0°C, Caceres 40.6°C, Jerez de la Frontera 42.2°C,
Badajoz 42.6°C, Cordoba 43.7°C, Sevilla 44.3°C.

Colin Youngs
Brussels

Keith (Southend) wrote in message ...
:The 18:00 synop for Faro had a maximum temp of 44.3°c with the RH at
:16%. The same temp as Seville in Spain.

Faro is on the coast - interesting that it is hotter than inland places in
Portugal even with a wind blowing directly from the interior.

Colin Youngs
Brussels

Faro is on the coast - interesting that it is hotter than inland places
in
Portugal even with a wind blowing directly from the interior.

I've noticed the same happen here with northeasterlies. When they blow, my
site (121m amsl) is slightly cooler than the central HNMS site (15m amsl,
appearing as "Athens" on weatheronline) which is down the wind (~1km SW from
here). When it comes to cloudy weather, I put the blame on a Foehn effect
(hills and mountains to the NE of both sites). But what could be the answer
when it's a perfectly clear and dry day, I wonder?

Yannis, SE Athens (yes, NE of the odd "Athens" weatheronline site)
+27.7C, RH 41%, SLP 1004.7 hPa

Yannis wrote in message ...
: Faro is on the coast - interesting that it is hotter than inland places
:in
: Portugal even with a wind blowing directly from the interior.
:
:I've noticed the same happen here with northeasterlies. When they blow, my
:site (121m amsl) is slightly cooler than the central HNMS site (15m amsl,
:appearing as "Athens" on weatheronline) which is down the wind (~1km SW
from
:here). When it comes to cloudy weather, I put the blame on a Foehn effect
hills and mountains to the NE of both sites). But what could be the answer
:when it's a perfectly clear and dry day, I wonder?

There are hills to the upwind side of Faro - NW and N - so perhaps there is
a föhn effect. That might also explain the extremely low RH - 6% at 12.00
UTC today - unless the instrument is faulty. Notice also the reports of
"smoke" - brush fires perhaps ?

Sunday night min. temp. at Faro was 32.0°C and Monday max. temp. 41.7°C - a
bit cooler than Sunday !

Still a few other places in Portugal and Spain over 40°C on Monday.

Evora in Portugal 40.2°C and in Spain: Badajoz 40.2°C, Jerez de la
Frontera 41.4°C, Cordoba 42.0°C, Sevilla 42.2°C.

Colin Youngs
Brussels

There are hills to the upwind side of Faro - NW and N - so perhaps there
is
a föhn effect. That might also explain the extremely low RH - 6% at
12.00
UTC today - unless the instrument is faulty. Notice also the reports of
"smoke" - brush fires perhaps ?

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.

Yannis, SE Athens
+26.8C, RH 55%, SLP 1007.3 hPa

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


There are hills to the upwind side of Faro - NW and N - so perhaps there
is
a föhn effect. That might also explain the extremely low RH - 6% at
12.00
UTC today - unless the instrument is faulty. Notice also the reports of
"smoke" - brush fires perhaps ?

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.

HiYannis

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.

--
Mike 55.13°N 6.69°W Coleraine posted to uk.sci.weather 27/07/2004 20:01:02 UTC