Will Hand wrote:

Why is the 564DAM line persistently a bit further north than it should be
then?
Or is it? GW could easily be responsible, if the Tropics are warming then
warmer, moister air is going to end up further north, is it not?

Sorry, I agree that the 564 line being further north - and all the others
too - is down to GW but not that the 564 line being further north is
responsible for the jet being further south. I think that reduced N-S
temperature contrast, because of the increase Arctic warming relative to the
tropics would lead to weaker jets and, presumably, they'd be further north.

Certainly, warmer, moister air due to GW will lead to heavier outbreaks of
rain when they occur. Deeper troposphere will also, I would have thought,
lead to more violent storms. How often we get these is something I wouldn't
like to guess - I'll leave it to the climate models.

--
Graham P Davis, Bracknell, Berks., UK. E-mail: newsman not newsboy
"I wear the cheese. It does not wear me."