Does anyone know which model is used to make BBC's weather maps? Is it
the unified model?

Yes.

wrote:
Does anyone know which model is used to make BBC's weather maps? Is it
the unified model?

wrote in message
ps.com...
Does anyone know which model is used to make BBC's weather maps? Is it
the unified model?

http://www.bbc.co.uk/weather/bbcweat...oadcasts.shtml

Broadly speaking, what you see on the screen will be based on the UM,
probably (in the case of forecasts covering BI/NW Europe), the North
Atlantic/European version of the model would be used ... see for example
....
http://homepage.ntlworld.com/booty.w...put.htm#Output

Martin.

--
Martin Rowley
Bracknell

Martin Rowley је напи�ао
wrote in message
ps.com...
Does anyone know which model is used to make BBC's weather maps? Is it
the unified model?

http://www.bbc.co.uk/weather/bbcweat...oadcasts.shtml

Broadly speaking, what you see on the screen will be based on the UM,
probably (in the case of forecasts covering BI/NW Europe), the North
Atlantic/European version of the model would be used ... see for example
...
http://homepage.ntlworld.com/booty.w...put.htm#Output

Martin.

And wehn they say the resolution is T254L64, what does it mean?

On 4 Jan 2007 11:32:24 -0800,
, in
. com wrote:

+ And wehn they say the resolution is T254L64, what does it mean?

As I recall my spectral modelling, that's a triangular truncation, 254
harmonics[*] (essentially a 55 Km resolution, a T170 is 75 Km), with
64 levels in the vertical. Seems to be state of the art for production
forecast models.

I'm sure the experimentalists are gleefully ramping up both the T and
L numbers...
[*] it has been a veeeeeeeeery long time since I've even thought about
spectral modeling details, and "harmonics" may not be the correct word.

Toss T254L64 into google and you'll get deeper details.

--
Consulting Minister for Consultants, DNRC
I can please only one person per day. Today is not your day. Tomorrow
isn't looking good, either.
I am BOFH. Resistance is futile. Your network will be assimilated.

In article ,
I R A Darth Aggie no-courtesy-copies-please wrote:
On 4 Jan 2007 11:32:24 -0800,
, in
.com wrote:

+ And wehn they say the resolution is T254L64, what does it mean?

As I recall my spectral modelling, that's a triangular truncation, 254
harmonics[*] (essentially a 55 Km resolution, a T170 is 75 Km), with
64 levels in the vertical. Seems to be state of the art for production
forecast models.

I'm sure the experimentalists are gleefully ramping up both the T and
L numbers...

[*] it has been a veeeeeeeeery long time since I've even thought about
spectral modeling details, and "harmonics" may not be the correct word.

Your memory serves you well. Harmonics is indeed the
term, and those are approximately the equivalent finite difference
equivalent resolutions. The T (as opposed to R) truncation specifies
the relationship between how many latitudinal (legendre polynomials)
harmonics and how many sine/cosine (longitude) you keep.

L64 seems popular in operations now. But the T (everyone has used
T since about T62, earlier was R truncation) is 382 in the US NWS, and
768 or so currently in the ECMWF (iirc).

Toss T254L64 into google and you'll get deeper details.

--
Robert Grumbine http://www.radix.net/~bobg/ Science faqs and amateur activities notes and links.
Sagredo (Galileo Galilei) "You present these recondite matters with too much
evidence and ease; this great facility makes them less appreciated than they
would be had they been presented in a more abstruse manner." Two New Sciences