Are there barographs available which plot the first derivative of the pressure
with respect to time, and would such a plot be useful alongside the pressure
signal itself?
I have developed a barograph which is is capable of such things, but I wonder
what the most useful printout might be. The current state of the art is
visible at http://www.meteormetrics.com and I would welcome comment,
especially if there is a useful parameter I could calculate and include on
future versions.

Thanks
Kevin Scott

In uk.sci.weather on Sat, 20 Sep 2003 at 17:44:07, DrKFS wrote :
Are there barographs available which plot the first derivative of the pressure
with respect to time, and would such a plot be useful alongside the pressure
signal itself?

I never was any good at calculus - what would the above show/prove?
--
Paul Hyett, Cheltenham, England

On Sun, 21 Sep 2003 18:37:18 +0100, rnet[dot]co[dot]uk
(Simon Gardner) wrote:

In article ,
(DrKFS) wrote:

Are there barographs available which plot the first derivative of the pressure
with respect to time

I have a German barometer which shows only the first derivative. But it
isn't a barograph.

Not a derivative I know but three hour tendencies can be plotted on a
chart and lines of equal tendency can be drawn - known as isallobars,
IIRC. Isallobaric charts can be useful in predicting the movement of
depressions.

I'm not too sure if rate of change of pressure is all that useful -
presumably it would give a nice pulse when a cold front goes through
but most of the time it would just hover around zero.

JPG

In uk.sci.weather on Mon, 22 Sep 2003 at 10:03:25, wrote :

I never was any good at calculus - what would the above show/prove?

Paul Hyett, Cheltenham, England

"Vidcapper"?

An attempt to reduce spam, plus I capture a lot of pics from TV shows.

It would plot the rate of change of pressure.

Ah!

Can't recall ever seeing much more than 4-5mb an hour myself.
--
Paul Hyett, Cheltenham, England

In uk.sci.weather on Mon, 20 Oct 2003 at 11:49:44, Chris Malcolm wrote :

If you watch at higher than usual resolution there are sometimes some
very fast small changes, e.g., a sudden tweak about half minute to a
minute before a rainstorm starts, and another before it stops.

If we ever get one of those again, I'll let you know.
--
Paul Hyett, Cheltenham

Email to pahyett[AT]activist[DOT]demon[DOT]co[DOT]uk