On 2021 Oct 02, at 12:09 , Gordon Kubanek wrote:
Not really new info, just more details.
From: ‘John Hollins’
Date: 2021-10-02 12:31
Paul Beckworth gave a very good CACOR Zoom talk on the jet stream on July 28: Abrupt Climate System Change Mayhem. Paul will be attending COP26 and is scheduled to speak to CACOR again on December 8.
On Sat, Oct 2, 2021 at 1:38 PM
From: Art Hunter
Bill will remember the days in the late 60s when I was flying C-130s to/from Europe in support of UN and NATO missions and the jet stream was more settled. We would use the 100 Nautical Mile per hour winds at about 25,000 ft. as a push to get us to Europe faster. Upon return, when heading west we did everything we could to avoid it slowing us down.
The meanderings were happening then but nothing like it is now. What aviators know is that the meanders are not only north and south but also in altitude. It is like a 3 dimensional snake wiggling it’s way east. Even inside the Jetstream there are speed variations and we would make real-time course corrections to aid progress or to totally avoid the Jetstream.
Bill, any comment?
From: Bill Pugsley
Sent: October 2, 2021 10:37 PM
You describe it well- I’ve briefed north Atlantic flights both civilian airlines at Dorval/Montreal and later with VIP RCAF flights from Uplands/Ottawa and we used to have 5 options to present and calculate head and tail winds from Ottawa/Montreal to Europe- the northern one touched the southern tip of Greenland, the southern most went through the Azores. The briefers would calculate wind components prior to each flight (from maps produced by computer for 20K ft and 30-35K ft) to give the pilot and navigator a choice of route
I haven’t been able to follow the latest twists and turns of the jet stream month by month or year by year but IMHO the significant thing will come when the jet streams (and the storm tracks they control) move a little farther north in response to the arctic warming- and that is when we’ll see more frequent warm spells and droughts in southern Canada. The omega blocks and north south meanderings of the jet stream are normal things although the media seem to make a big deal about them individually
On Oct 5, 2021, at 16:30,
From: David Dougherty
One can now find the current path of the northern jet at any time.
This was taken just now. Perhaps it was once easy to plot a course with advantageous winds. These days, though the data are far better, the winds are much more chaotic. Often, they are going north and south at some points rather than to the east.