Gary also sent in the link to www.newscientist.com/article/2294961-jupiters-great-red-spot-extends-far… … [see also https://doi.org/10.1126/science.abf1015 and https://doi.org/10.1126/science.abf1396 ] … the Juno spacecraft has peered deeper into the clouds on Jupiter and it seems the Great Red Spot storm track extends far beneath the top of the atmosphere. The storm seems to reach a depth of 500 km it has been calculated. The jet strems that make the bands of colour at the top of Jupiter's atmosphere on the other hand extend 3000 km downwards.
The same story is at www.dailymail.co.uk/sciencetech/article-10143953/ … with lots of images.