Bookmarks problem

[Bill4321]

9 hours ago, Cold Winter Night said:

A chart like the one above shows two variables:

1) The surface pressure, expressed in hPa and made visible with the white isobars.
2) The height of the level where the air pressure is equal to 500 hPa. This is expressed in decameters (dam) and made visible with the colours. See the legend at the bottom of the chart.

The last variable is what we refer to when talking about "heights".
Higher values (higher heights) mean that the 500hPa level is found higher up, and therefore there is 'more air' below it, it's a thicker layer of air (usually warmer too). The more yellow and orange, the higher the heights.
Lower heights are represented by the blues and purples. In those places the layer of air is thinner (usually colder) and therefore the 500 hPa level is already found at a lower height.

On average this 500 hPa surface is higher as you go further South towards the equator (obvious on charts), because warmer air has a lower density and takes up more space than cold, dense air.

The tricky thing is that often low pressure systems at the surface are associated with a "low height" of the 500hPa level, but not always.
And high surface pressure is often associated with a "high height" of the 500hPa level, but not always.

If they go together, they are more powerful. If they don't they are weaker features.
For example, a "wedge" is an area of higher surface pressure that does not have a really high 500 hPa level. It is weaker than a real High, because it is not backed up by that thick layer of air, so to speak.

Hope this helps!

 

Hi guys, sorry to drop this here but I wanted to bookmark this post as it is very helpful.. yet the bookmark button has disappeared! I am also getting an "error code: 2bookmarknoperm" when trying to open https://www.netweather.tv/forum/bookmarks/ to find info about bookmarks. Not sure if I'm being utterly stupid here or if there's a problem with the latest forum code?

 

[Paul]

Hi @Bill4321 - I can't recreate the problem here, can I ask which theme you're using and are you on mobile, desktop or tablet?

[Bill4321]

Hi @Paul

I'm not using any specific theme and on the desktop. I was able to bookmark up until just prior to Xmas so it's a fairly new problem. I will try logging in and out to see if that works.. just a mo..

[Bill4321]

Logging off and on hasn't fixed it. I get the following when trying to access https://www.netweather.tv/forum/bookmarks/

 

[Paul]

There was actually an update to the bookmarks system that went in yesterday, which I think may have changed some things. Is it any better for you now?

[Bill4321]

Yes! The bookmark button is back and the error code has gone. Thank you so much Paul!

[Paul]

Excellent, glad it's sorted