@ZLabe

Do the two innermost circles have higher air pressure than the outer rings spreading across the continents?

@Freedom2B @ZLabe
In the top right corner it says "contour lines are 500hPa Geopotential height"

Had to read up what that meant:
https://en.wikipedia.org/wiki/Geopotential_height

As I understand it:
500hPa is the "normal" pressure level at 5570m or 18200ft above sea level.

The map shows how high that pressure level is in that weather situation.
The inner pink, red, orange circles are much higher than that, up to 5940m in the center. (I guess the numbers are in 10s of meters, the first line in the white zone says 558)

@Freedom2B @ZLabe

I think one can visualize that literally like a dome, like the air supported domes used as sports halls.

Instead of a compressor, that meteorological dome is "supported" or fueled by the heat at ground level, which heats up air, which rises up into higher atmospheric levels, like a hot air ballon.

The hotter the ground, the more and hotter air mass is genererated, the further that air rises up until it reaches the 500hPa pressure level.

@Freedom2B @ZLabe

I imagine it like the hot air and combustion gases that are funneled up above a campfire, as can be seen by the stream of embers floating up into the sky, and, if there's a lot or long living embers, one can see that the hot gas mass eventually does not rise up any more, the embers move I'm an arc, then horizontally, and eventually sink down towards the ground, some distance away from the campfire itself.

That way, there's a mini heat dome above the fire.