Opps sorry this is really serious.
Oh no I've done it again :-)




"Steve Loft" wrote in message
...
Lawrence Jenkins wrote:
I will only say this. It seemed to me like writing out a nice card for
somebody and then being grammatically corrected. It could have
waited....
or did I miss a very important issue here?

shrug Gianna seemed to appreciate it.

Now, Lawrence, about this top-posting...
--
Steve Loft, Wanlockhead, Dumfriesshire. 1417ft ASL
http://www.wanlockhead.org.uk/weather/
Free weather softwa http://cumulus.nybbles.co.uk/
Experimental webcam: http://www.wanlockhead.org.uk/webcam.php

Sorry Steve just an after thought. When I saw the Thread title "Calculating
thickness" I took it rather personally.






"Steve Loft" wrote in message
...
Lawrence Jenkins wrote:
I will only say this. It seemed to me like writing out a nice card for
somebody and then being grammatically corrected. It could have
waited....
or did I miss a very important issue here?

shrug Gianna seemed to appreciate it.

Now, Lawrence, about this top-posting...
--
Steve Loft, Wanlockhead, Dumfriesshire. 1417ft ASL
http://www.wanlockhead.org.uk/weather/
Free weather softwa http://cumulus.nybbles.co.uk/
Experimental webcam: http://www.wanlockhead.org.uk/webcam.php

To calculate thickness values in DAM I have always used the eqution
(1000mB - SLP ) * 0.87 )+ 500 mB height. Is this correct as I cannot
explain the 0.87 constant factor.


Regards


Sean B

"Steve" wrote in message
...

"Mr Blowman" S@not here.karoo.co.uk wrote in message
...
To calculate thickness values in DAM I have always used the eqution
(1000mB - SLP ) * 0.87 )+ 500 mB height. Is this correct as I cannot
explain the 0.87 constant factor.

Decrease in pressure with height is 1hPa per 0.87 dam, roughly.




Thanks Steve


Do you have an official source available as a link, thanks in advance .

Regards

Sean B