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================================================== ==================
This posting expresses the personal view and opinions of the author.
Something which everyone on this planet should be able to do.
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http://www.bbc.co.uk/weather/ukweath...d.shtml#no_url

Lightest winds over the top of the Cairngorms !!!
I don't think so somehow.

Will.
--

" Stuff the thought police, I don't care anymore, I am free, I am me -
quack quack "
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"Will Hand" wrote in message
...

================================================== ==================
This posting expresses the personal view and opinions of the author.
Something which everyone on this planet should be able to do.
================================================== ==================

http://www.bbc.co.uk/weather/ukweath...d.shtml#no_url

Lightest winds over the top of the Cairngorms !!!
I don't think so somehow.

Will.
--

Will

If the strength of the winds is indicated by the size of the darts, what do
you think their colour signifies?

Regards, Roger

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"Roger Smith" wrote in message
...

"Will Hand" wrote in message
...

================================================== ==================
This posting expresses the personal view and opinions of the author.
Something which everyone on this planet should be able to do.
================================================== ==================

http://www.bbc.co.uk/weather/ukweath...d.shtml#no_url

Lightest winds over the top of the Cairngorms !!!
I don't think so somehow.

Will.
--

Will

If the strength of the winds is indicated by the size of the darts, what do
you think their colour signifies?


I think it is meant to signify air temperature.
That's a neat way of showing temperature and wind together.

Will.
--

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On Fri, 27 May 2005 21:40:50 GMT, Roger Smith wrote in


If the strength of the winds is indicated by the size of the darts, what do
you think their colour signifies?

Almost certainly it is meant to be some vague representation of
temperature. Brown would be the warmest and blue the coldest, as was the
case in the old forecast scheme. Green was also used, but seems to have
been replaced by white in this new system.

--
Mike 55.13°N 6.69°W Coleraine posted to uk.sci.weather 27/05/2005 21:51:29 UTC

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"Mike Tullett" wrote in message
...
On Fri, 27 May 2005 21:40:50 GMT, Roger Smith wrote in


If the strength of the winds is indicated by the size of the darts, what
do
you think their colour signifies?

Almost certainly it is meant to be some vague representation of
temperature. Brown would be the warmest and blue the coldest, as was the
case in the old forecast scheme. Green was also used, but seems to have
been replaced by white in this new system.

--
Thanks Mike and Will. I am not convinced (warm air over Ben Nevis?) so we
shall wait and see. Why not just show the mountain areas? (Shh...)

Regards, Roger

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On Fri, 27 May 2005 21:40:50 GMT, Roger Smith wrote:

If the strength of the winds is indicated by the size of the darts,

How can the size indicate anything? The 3D projection means that the
ones up north are smaller than those down south...

what do you think their colour signifies?

I guess temperature. If a graphic needs to be explained it has failed.
(Is there an echo in here?)

--
Cheers
Dave. pam is missing e-mail

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On Fri, 27 May 2005 23:37:56 +0100 (BST), "Dave Liquorice"
wrote:

On Fri, 27 May 2005 21:40:50 GMT, Roger Smith wrote:

If the strength of the winds is indicated by the size of the darts,

How can the size indicate anything? The 3D projection means that the
ones up north are smaller than those down south...

That's a good point? So the arrows representing a hurricane on Orkney
will be the same size as a gentle zephyr in Tunbridge Wells.

Or will they?

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On Fri, 27 May 2005 22:31:47 GMT, Roger Smith wrote in


Thanks Mike and Will. I am not convinced (warm air over Ben Nevis?) so we
shall wait and see. Why not just show the mountain areas? (Shh...)

The BBC website does in fact explain with these words:

"What do 'wind charts' show?
Our wind charts show computer generated arrows illustrative of the expected
wind speed and direction at the time shown. The larger the arrows, the
stronger the winds. The colours indicate whether the wind will bring colder
or warmer air, and range from blue (cold) to white and orange (warm). Find
out more about wind arrows."

Then on another page I saw this:

"On both website and television forecasts, once the speed of the wind
reaches a certain strength, the wind arrows will not increase in size. On
the website, this speed is 35; on television, this speed is 45mph"

Taken from

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

So a 70mph wind will look identical to one of 35mph on the web and 45 on
the TV!!

--
Mike 55.13°N 6.69°W Coleraine posted to uk.sci.weather 28/05/2005 08:44:42 UTC

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"Mike Tullett" wrote in message
...
On Fri, 27 May 2005 22:31:47 GMT, Roger Smith wrote in


Thanks Mike and Will. I am not convinced (warm air over Ben Nevis?) so we
shall wait and see. Why not just show the mountain areas? (Shh...)

The BBC website does in fact explain with these words:

"What do 'wind charts' show?
Our wind charts show computer generated arrows illustrative of the expected
wind speed and direction at the time shown. The larger the arrows, the
stronger the winds. The colours indicate whether the wind will bring colder
or warmer air, and range from blue (cold) to white and orange (warm). Find
out more about wind arrows."

Then on another page I saw this:

"On both website and television forecasts, once the speed of the wind
reaches a certain strength, the wind arrows will not increase in size. On
the website, this speed is 35; on television, this speed is 45mph"

Taken from

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

So a 70mph wind will look identical to one of 35mph on the web and 45 on
the TV!!


Which just goes to show that those graphics were designed by people with the
weather intelligence of chimpanzees (sorry chimps but you know what I mean!).
Damage caused to structures increases with the square of the wind and a mean
wind of 50 mph (not uncommon in winter) will do circa twice as much damage as a
mean wind of 35 mph. Also why have the scale different on the TV to the web ? To
confuse people perhaps or because of some programming convenience ?

Will.
--

" Forget the BBC, visit www.metoffice.gov.uk for UK weather information "
-------------------------------------------------------------------------------
A COL BH site in East Dartmoor at Haytor, Devon 310m asl (1017 feet).

mailto:
www: http://www.lyneside.demon.co.uk

DISCLAIMER - All views and opinions expressed by myself are personal
and do not necessarily represent those of my employer.
-------------------------------------------------------------------------------

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Paul C wrote:
On Fri, 27 May 2005 23:37:56 +0100 (BST), "Dave Liquorice"
wrote:


On Fri, 27 May 2005 21:40:50 GMT, Roger Smith wrote:


If the strength of the winds is indicated by the size of the darts,

How can the size indicate anything? The 3D projection means that the
ones up north are smaller than those down south...


That's a good point? So the arrows representing a hurricane on Orkney
will be the same size as a gentle zephyr in Tunbridge Wells.

Or will they?

A wind that disturbs a roof-tile in Tunbridge Wells will get on the
national news whereas a hurricane in Orkney won't get a mention so I
suppose they've got it about right.

Graham
Bracknell