Madden-Julian Oscillation

The Madden-Julian Oscillation is the largest source of tropical weather variability on sub-seasonal timescales: an eastward-propagating pulse of enhanced rainfall and cloudiness followed by a suppressed, drier phase, that circles the globe along the tropics over roughly a month to two months, primarily active across the Indian and Pacific Oceans. It modulates monsoon onset, tropical cyclone formation and the timing of El Nino development, and it is named for Roland Madden and Paul Julian, the two American meteorologists who first documented it from tropical Pacific pressure and wind records. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/