On Jun 6, 8:15*am, "N_Cook" wrote:
Adam Lea wrote in message

What atmospheric processes are capable of shifting the jet stream
further north, closer to where it should be for the time of year?

Or to put it the other way, I'd like to know why "our" jetstream passes over
the UK for
( my guess as I've not found figures for it) about 80 percent of the time ,
we being a relatively small section of available latitude on the globe.

It is analogous to the equatorial counter current in the oceans. There
are more erratic ones in the Global Conveyance of ocean currents but
they all take place at known regions.

It would appear they are associated with the propensity of the
atmosphere to produce tropical storms alongside Blocking Lows in the
North Atlantic.