On Fri, 24 Dec 2004 22:19:13 +0000, John Hall wrote in


http://meteocentre.com/analyse/map.p...lang=en&map=UK

It's fascinating to look at the current (2100) chart and see so many
500-1000 hPa thickness contours so close together, from 546 through
southern England to as low as 510 through the Orkneys.

John - I think the red dashed lines are in fact the 500 hPa heights, rather
than the 500-1000 hPa thickness. However, if you follow the 1000 hPa
isobar north west, the values would be that of thickness.
So 552 through NW France and 522 somewhere to my north west, with that cold
air advection still occurring.

Slight patchy cover here of snow and snow pellets on cars now, with
temperature of 1.6C

--
Mike 55.13°N 6.69°W Coleraine posted to uk.sci.weather 24/12/2004 22:30:06 UTC