I want to find a method to learn and to teach others how to do it...
Michael is also doing his best..
Me, more than obvious, in the role of the apprentice.
An Exercise of Great Patience
Do you know the origin of the word eccentric?
It is an engineering term.
And it appears on weather charts
It has a similar meaning with the weather.
See if you can see an eccentric patch on a weather chart.
do you call patches to those concentric rings?
An eccentric patch throws out a leg. It starts by becoming pointed or triangular.
At least that's how it looks on the BoM charts. With stuff in the North Atlantic it becomes eccentric on the outer edge.
Sometimes it throws a leg in between two systems of the opposite type.
The leg is called a trough if it is Low pressure. And you can guess what a ridge forms from.
Oh yes I have read about a trough.. but no idea what is or how it looks in a chart
Well go through some of the stuff you have and see if you can spot a leg running from one eccentric patch to another.
No. Do me a favour, please
I need the model, the pattern first --if you show me how it looks in a chart I will be able to recognize it later by myself. Got it?
that 983 L has an eccentric centre and a leg?
(LOL) I'm guessing
This one becomes eccentric and it would throw out a trough but there is nothing to contain it so it just splits in two.
A trough forms between tow high pressure systems.
those systems look like a biological cell
People imagine a Low pressure area would dissolve into an high one and make all the pressure the same all over the sea or land.
But that NEVER happens.
So a trough or a ridge can form because the opposite pressures either side act like mountains or valleys fencing in the leg .
Or you could think of it as a boil spurting poison out between to complessing fingers.
In the chart for T+72 there is a High over Russia that is forming a Ridge of High Pressure out over the Mediteranian.
Really, all that region between the 1016 millibar and the 120 millibar line is a COL.
The same thing appears over Southern Greenland.
It generally looks like an X, made up of the outer rings of the other systems surrounding it.
An High in Greenland and the Low over Iceland, the Low in the Atlantic on the bottom of the chart and the High to the left of it.
And there is probably another Low on the left in North America, just waiting its turn to come over here.
If that bottom High grows, and the Greenland High stays, there will be a tornado when the North American Low moves in between.
okay. tell me now how is their movement.. where they are going to.. where do they come from and where do they go to..
Officially nobody knows. But I believe god knows. Ask hime to tell you and you will know what he tells me.
are there a law or something like that?
I suppose there is
When the weather doesn't move North West on the Atlantic chart, that's when it is time to batten down the hatches.
Nobody knows where Highs come from. We know that they form high in the air out of cold weather that is compressed as it falls between Low pressure systems.
But Highs in winter tend to remain a lot colder that Lows. A hell of a lot colder. But up in the top of the sky they are probably lower than minus 70.
Otherwise they wouldn't be able to fall.
Notice how close the different pressures are on that chart.
The High over Greenland is only 1016.
The Low off Spain is only 996.
So in all that distance the difference overall is just 20 millibars.
It is a bit more between Sweden and Russia.
I am on the t+84 chart
The other ones are too complex for me to explain to you just now.
Go back one to t+72 and you have three lows off Sweden.
But they are all the same pressure -more or less.
It is really all just nominal numbers. Look at the Greenland High.
You can't really call it an High.
But they do. It is very similar to your High from Yesterday. Just a name.
on t+60 they are still nearly the same pressures.