I don't think that is correct as he is writing about a phenomena which is happening along the west coast today and it's not planes flying back and forward in the jet stream.
‘In particular, this past winter over the Eastern U.S. and Midwest, this so-called polar vortex episode happened. And what that was: it was a big bulge in the jet stream. It went way far to the south, allowing cold air to spill out of Canada, down much farther south than usual. And on the converse side, over in California you have a compensating ridge, kind of a U-shaped bulge in the jet stream going far to the north, which allowed very warm air from Mexico in the south to bring California its warmest and driest winter on record. So when you get one of these major jet stream undulations, it tends to ring extreme weather of both kinds, both the hot extreme and the cold extreme, and wet and dry extremes.'
google up national geographic 'the blob that cooked the pacific' [www.nationalgeographic.com]
Edited 1 time(s). Last edit at 14-Jan-18 21:51 by molder.