Jim Williams (@Jim7W)

In 1989, Voyager 2 measured winds up to 2,100 kilometres an hour circling an Earth-sized storm on Neptune; by 1994, when Hubble looked again, the storm had simply vanished, unlike Jupiter's Great Red Spot, which has raged for more than a century. https://spacedaily.com/t-in-1989-voyager-2-measured-winds-up-to-2-100-kilometres-an-hour-circling-an-earth-sized-storm-on-neptune-by-1994-when-hubble-looked-again-the-storm-had-simply-vanished-unlike-jupiters-great-red-spot/