"Yokel" wrote ...
snip
Just as a matter of interest, can someone give the reason why the
"thickness" isopleths only appear on forecast charts 36 or more
hours ahead,
and not on actual, +12 or +24 charts? If both 1000 hPa and 500 hPa
fields
are produced for all these times, there seems no reason why those
potentially useful thickness contours do not appear on current and
near
future charts.

.... we had this discussion several years ago: find it at ...
http://tinyurl.com/a9ohu8

I don't think anything has changed in essence so I can't see TTHK
appearing on T+0/T+24, and in any case, there are so many other
diagnostic variables available that total thickness, whilst
undoubtedly still useful, has fallen somewhat out of fashion.

Martin.


--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023