There will be no pressure in the UK on Thursday - repeat - NO
pressu

http://expertcharts.weatheronline.co...01300_1000.gif

Richard

"Richard Dixon" wrote in message
...
There will be no pressure in the UK on Thursday - repeat - NO
pressu

http://expertcharts.weatheronline.co...01300_1000.gif

Richard

Now updated it seems! But, as the TV people sometimes say, a good time to
check your barometer.

Out of interest, what is the significance of the 1013hPa line? Is that
figure a generally accepted delineation between high and low pressure or is
it just a facet of this particular forecaster?

Roger

On Oct 10, 10:34*am, "Roger Smith" wrote:
"Richard Dixon" wrote in message

... There will be no pressure in the UK on Thursday - repeat - NO
pressu

http://expertcharts.weatheronline.co...ts/en/ecmwf/20...

Richard

Now updated it seems! *But, as the TV people sometimes say, a good time to
check your barometer.

Out of interest, what is the significance of the 1013hPa line? *Is that
figure a generally accepted delineation between high and low pressure or is
it just a facet of this particular forecaster?

Roger

1013.25 hPA is average sea-level pressure.

Stephen.

"Stephen Davenport" wrote in message
...
On Oct 10, 10:34 am, "Roger Smith" wrote:
"Richard Dixon" wrote in message

...
There will be no pressure in the UK on Thursday - repeat - NO
pressu

http://expertcharts.weatheronline.co...ts/en/ecmwf/20...

Richard

Now updated it seems! But, as the TV people sometimes say, a good time to
check your barometer.

Out of interest, what is the significance of the 1013hPa line? Is that
figure a generally accepted delineation between high and low pressure or
is
it just a facet of this particular forecaster?

Roger

1013.25 hPA is average sea-level pressure.

Stephen.

Thank you, Stephen

On 2011-10-10, Stephen Davenport wrote:
1013.25 hPA is average sea-level pressure.

Our of interest, does that mean that Mr. Bar, Monsieur Pascal or whoever,
got his measurements slightly wrong?

Adrian

In message , Adrian writes
On 2011-10-10, Stephen Davenport wrote:
1013.25 hPA is average sea-level pressure.

Our of interest, does that mean that Mr. Bar, Monsieur Pascal or whoever,
got his measurements slightly wrong?

Adrian

I was wondering about that. Wikipedia tells me that the unit is down to
William Napier Shaw, and that a bar is 10^5 pascals. The similarity to 1
atmosphere is semi-coincidental (if it wasn't so close there would have
been less motivation to define the bar).

The name derives from the Greek baros, meaning weight.
--
Stewart Robert Hinsley

Our of interest, does that mean that Mr. Bar, Monsieur Pascal
or whoever,
got his measurements slightly wrong?
Adrian

I wouldn't have thought so.

Pascals are derivative units, based on the distance from Pole to
Equator, the second, and the density of water, and there's no
fundamental reason why air pressure should be a nice round
number of Pascals.

Anne

On Oct 10, 12:44*pm, "Roger Smith" wrote:
"Stephen Davenport" wrote in message

...
On Oct 10, 10:34 am, "Roger Smith" wrote:





"Richard Dixon" wrote in message

....
There will be no pressure in the UK on Thursday - repeat - NO
pressu

http://expertcharts.weatheronline.co...ts/en/ecmwf/20....

Richard

Now updated it seems! But, as the TV people sometimes say, a good time to
check your barometer.

Out of interest, what is the significance of the 1013hPa line? Is that
figure a generally accepted delineation between high and low pressure or
is
it just a facet of this particular forecaster?

Roger

1013.25 hPA is average sea-level pressure.

Stephen.

Thank you, Stephen- Hide quoted text -

- Show quoted text -
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
In the good old days of mercury- in- glass barometers, Torrecelli
found the atmosphere supported a 76 cm long column of mercury.
A nice round figure which converts to a not so round 1013.25 mb.

How they decided 76 cm of mercury was an average sea level pressure I
do not know.

Was it the average pressure in Rome in a year around 1643? What about
adjusting to sea level?
Were they that clever?

Len Wood
Wembury

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

On Oct 10, 4:22*pm, Len Wood wrote:
On Oct 10, 12:44*pm, "Roger Smith" wrote:



"Stephen Davenport" wrote in message

....
On Oct 10, 10:34 am, "Roger Smith" wrote:

"Richard Dixon" wrote in message

....
There will be no pressure in the UK on Thursday - repeat - NO
pressu

http://expertcharts.weatheronline.co...ts/en/ecmwf/20...

Richard

Now updated it seems! But, as the TV people sometimes say, a good time to
check your barometer.

Out of interest, what is the significance of the 1013hPa line? Is that
figure a generally accepted delineation between high and low pressure or
is
it just a facet of this particular forecaster?

Roger

1013.25 hPA is average sea-level pressure.

Stephen.

Thank you, Stephen- Hide quoted text -

- Show quoted text -

---------------------------------------------------------------------------*---------------------------------------------------------------------------*-----------------------------------
In the good old days of mercury- in- glass barometers, Torrecelli
found the atmosphere supported a 76 cm long column of mercury.
A nice round figure which converts to a not so round 1013.25 mb.

How they decided 76 cm of mercury was an average sea level pressure I
do not know.

Was it the average pressure in Rome in a year around 1643? What about
adjusting to sea level?
Were they that clever?

Len Wood
Wembury

---------------------------------------------------------------------------*---------------------------------------------------------------------------*----------------------------------------- Hide quoted text -

- Show quoted text -

No pressure, eh -

Does that mean that some ecogreenie teacher is going to press a little
red button and destroy young climate realists who refuse to be
brainwashed by their "educators"?

CK

On Oct 10, 3:46*pm, Natsman wrote:
On Oct 10, 4:22*pm, Len Wood wrote:





On Oct 10, 12:44*pm, "Roger Smith" wrote:

"Stephen Davenport" wrote in message

....
On Oct 10, 10:34 am, "Roger Smith" wrote:

"Richard Dixon" wrote in message

...
There will be no pressure in the UK on Thursday - repeat - NO
pressu

http://expertcharts.weatheronline.co...ts/en/ecmwf/20...

Richard

Now updated it seems! But, as the TV people sometimes say, a good time to
check your barometer.

Out of interest, what is the significance of the 1013hPa line? Is that
figure a generally accepted delineation between high and low pressure or
is
it just a facet of this particular forecaster?

Roger

1013.25 hPA is average sea-level pressure.

Stephen.

Thank you, Stephen- Hide quoted text -

- Show quoted text -

---------------------------------------------------------------------------**--------------------------------------------------------------------------*-*-----------------------------------
In the good old days of mercury- in- glass barometers, Torrecelli
found the atmosphere supported a 76 cm long column of mercury.
A nice round figure which converts to a not so round 1013.25 mb.

How they decided 76 cm of mercury was an average sea level pressure I
do not know.

Was it the average pressure in Rome in a year around 1643? What about
adjusting to sea level?
Were they that clever?

Len Wood
Wembury

---------------------------------------------------------------------------**--------------------------------------------------------------------------*-*----------------------------------------- Hide quoted text -

- Show quoted text -

No pressure, eh -

Does that mean that some ecogreenie teacher is going to press a little
red button and destroy young climate realists who refuse to be
brainwashed by their "educators"?

CK- Hide quoted text -

- Show quoted text -

Yep saw that disgraceful AGW video made by that Rat Bag Richard
Curtis. I've never forgiven him for the nasty hurtful joke he wrote at
Margaret Beckett's expense on the Vicar of Dibley. The poor woman was
humiliated nationally, If I ever bump into the prat I'll let him know.
I hate so called left political comedian as they are invariably
personally cruel and always not the remotest bit funny and think all
they have to do is mention the names Thatcher and Archer and the BBC
type fall about in righteous self hysterics. Yet not one of them
criticised that cruel Beckett so called gag. That's the mind set
we're dealing with.