[Pressure]

Coloured lines with triangles or circles are weather fronts, see here for the key:

http://www.metoffice...y.html#pressure

The jet stream is fairly high up, roughly about 30,000ft (though can vary depending on time of year)- and the winds at the jet level are not always/often not blowing in the same direction as the surface winds, so you can't really correlate jet stream lines with surface level pressure which charts you refer to. Though the jet stream can aid in the development of low pressure, i.e. the left exits and right entrances of a jet stream, where upper winds diverge, creates a vaccum and forces air upwards from the surface to create low pressure near the surface.

Thank you.

[Pressure]

My first post. I am interested in pressure too and a complete beginner. I have searched the web but can not find a good intro to reading pressure maps like the one found here at the Met Office. I understand that the basic contour lines indicate pressure, but can't make sense of the coloured lines with triangles or circles on them. Can anyone help here?

A good indicator for where wet weather will be is the location of the Jet stream

I have found a forecast map of the jet stream here. Is there any way to correlate the stream with the lines on the air pressure map?