Martin Rowley wrote:
"Howard Neil" wrote in message
...

Martin Rowley wrote:


snip

I have some simple 'rules' which couple the rise or fall of

barometer

reading with season and wind-direction. They are not my original

work -

having been cribbed from somewhere about 30-odd years ago, and as

others

will point out, such 'rules' abounded in the pre-computer age.

It may be worthwhile having something like this in the FAQ.



... indeed, it might: but (done properly) it will need a separate
structure etc. As I wrote, I'll get around to it one day ... but needs a
lot of research etc., to avoid just wholesale copying of existing texts.
It is something I intend to do though. There are lots of 'rules' based
on single readings relating to such as whether or not frost is expected
at night (based, for example, on afternoon temperature and relative
humidity or wet bulb), and the one I posted recently relating to
build-up of Cu during the day. Many of these could be useful.

I would certainly like to see them. I have sent you an e-mail (I hope
that the offer made to Ruth still stands).


--
Howard Neil

... as I've had several requests, I've knocked up a simple web table with
the text. Use with caution, read the notes ... they are not my original
work: I can see some things which I might re-write or alter, and one day
I'll have a go at it.

Find the page at:-

http://homepage.ntlworld.com/booty.w..._barometer.htm

Martin.


--
FAQ & Glossary for uk.sci.weather at:-
http://homepage.ntlworld.com/booty.weather/uswfaqfr.htm

Find the page at:-

http://homepage.ntlworld.com/booty.w..._barometer.htm

Martin.


Martin,

Thanks, - this is the kind of description that can help students bridge the gap
between standard text-book material and the weather they see and experience
(or, hopefully see and experience!).

Julian
Julian Mayes, Molesey, Surrey.

In article ,
"Martin Rowley" wrote:

http://homepage.ntlworld.com/booty.w..._barometer.htm

Interesting stuff - thanks very much for posting the url......!

All the best

Ruth

Hi. here is another set (from the Finnish Weather book - from snails
to El nino - published by Otava). Martin, if you like you can add them
to the coming FAQ.
(Email me and I'll send you a proper reference to the book).

Very basic barometer forecast rules:
Look at the change in 3 hours.
If the pressure is descending, there is a low pressure coming.
If it's ascending, the low is passing or a high pressure is coming.
When the pressure is changing rapidly ( 6 hPa/3 hours), it's windy.

More detailed:
Sinking slowly (0.5 - 3 hPa in 3h): low is weak, dying or moving
slowly.
You might get some rain but typically no hard winds.

Sinking moderately (3-6 hPa/3h): rapid movement or deepening low.
Moderate winds and rain in warm front. The low is passing you fast so
day after tomorrow will typically be fine.

Sink 6-12 hPa/3h: Storm.

And rise is connected to gradually drier weather.

hPa (hectopascal) are as big as mbar (millibars), typically near 1000.
An older barometer might have mmHg (numbers near 760) or even inHg.
Transform formulas in many science books and encyclopedias.

Elena


wrote in message ...
In article ,
"Martin Rowley" wrote:

http://homepage.ntlworld.com/booty.w..._barometer.htm

Interesting stuff - thanks very much for posting the url......!

All the best

Ruth

"Elena" wrote in message
om...
Hi. here is another set (from the Finnish Weather book - from snails
to El nino - published by Otava). Martin, if you like you can add them
to the coming FAQ.
(Email me and I'll send you a proper reference to the book).

Very basic barometer forecast rules:

... thanks: have seen your email. Just for everyone else. Please *don't*
expect this to happen quickly! It is very much a long-term project.

Martin.