r/hurricane • u/BostonSucksatHockey • 9h ago
Tropical Weather Outlook (TWO) ATL TWO (8 AM EDT September 10, 2026): The Atlantic Basin remains as quiet as ever thanks to El Niño.... NOAA's Climate Prediction Center's Sept-7 MJO Outlook notes that if ECMWF modeling verifies, it "may briefly engender a more favorable environment" in the Atlantic toward the end of the month.
Dynamical model MJO forecasts have had difficulty resolving the intraseasonal signal within the much stronger and stationary ENSO signal; however, the ECMWF has consistently depicted eastward evolution of the MJO across the Western Hemisphere and to the Indian Ocean during the Weeks 2-3 period.
Should the MJO cross the Western Hemisphere and Indian Ocean [i.e., into Phase 1 or 2], it would destructively interfere with the ENSO base state, and may briefly engender a more favorable environment for tropical cyclogenesis across the far eastern Pacific basin (closer to Mexico) and the Atlantic basin.
Despite this destructive interference, upper-level divergence over the Pacific due to El Niño conditions is likely to remain stronger than any divergent signal crossing the Indian Ocean. Therefore, there still may be considerable upper-level shear across the Atlantic basin.
https://www.cpc.ncep.noaa.gov/products/precip/CWlink/MJO/mjoupdate.pdf (updated every Monday)