Really nice illustration of before and after the Madden-Julian Oscillation passage in the Atlantic from the GEFS-parallel. Note the initial high shear (red) in the deep tropics, then the late Aug transition to lower shear (blue) through the first part of Sep @TropicalTidbits pic.twitter.com/0JHcuzSSFB

— Eric Blake 🌀 (@EricBlake12) August 10, 2020