|Quoting Julesmusician (Reply 4):|
I assume the NATS tracks take into account the jetstream and change according to weather?
Yes they do. They plot them (if I'm correctly informed) with reference to the northern jetstream, the boundary between the Ferrell cell and Polar cell air circulation systems. There may be a southern jetstream down closer to tropical latitudes which is the front between the Hadley cell and Ferrell cell but it is not organized like the northern jets and the Hadley cell produces easterly winds. (the northeast trades)
So summer or winter, the ideal crossing tends to be roughly between the Grand Banks and Labrador and between northern Scotland and, say Brest, France. The Atlantic is also very much narrower up there.
I have seen the southernmost track lie over the Azores but usually they are a ways north of there. Typically, 45 North might be about as far south as you would find the southernmost track.
Also they sometimes make the southernmost track angle down, from the vicinity of 40 or 50 west, toward the southern US, coasting in, maybe down toward the Chesapeake area.
Happiness is not seeing another trite Ste. Maarten photo all week long.