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preasure charts


morgy
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Hi

I was looking at a pressure chart from the met office and i noticed little red dotted lines and i wondered what they were and what they ment.

I know how to read a pressure chart although i am not a weather pro. My first thought is that they are upper surface winds or jet stream :?: but i dont know!!

Can any one clear this up for me

http://www.metoffice.gov.uk/weather/uk/ ... ssure.html

Thanks

morgy

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Does this help mate?? http://www.metoffice.gov.uk/weather/uk/ ... l#pressure

To quote ::

Thickness lines

Pressure decreases with altitude, and thickness measures the difference in height between two standard pressure levels in the atmosphere. It is proportional to the mean temperature of this layer of air, so is a useful way of describing the temperature of an airmass.

Weather charts commonly show contour lines of 1,000-500 hPa thickness, which represent the depth (in decametres, where 1 dam = 10 m) of the layer between the 1,000 hPa and 500 hPa pressure levels. Cold, polar air has low thickness, and values of 528 dam or less frequently bring snow to the UK. Conversely, warm, tropical air has high thickness, and values in excess of 564 dam across the UK often indicate a heatwave.

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