BOM: Negative Indian Ocean Dipole Event Continues
CoffeeNetwork (New York) – The latest forecast from Australia’s Bureau of Meteorology (BOM) notes that the negative Indian Ocean Dipole (IOD) event continues.
The most recent weekly IOD index value is −0.76 °C, with warmer than average waters in the eastern tropical Indian Ocean, and average to cooler than average waters in the western tropical Indian Ocean. Most climate models surveyed by the Bureau predict negative IOD conditions are likely to persist throughout spring.
The El Niño–Southern Oscillation (ENSO) remains neutral with most oceanic and atmospheric indicators within the neutral range. While pressure patterns show some La Niña-like characteristics, as indicated by the latest Southern Oscillation Index (SOI) 30-day value of +15.1, it is likely that some of this shift in pressure is driven from warm conditions in the eastern Indian Ocean. Most climate model outlooks indicate the central tropical Pacific is likely to cool over the coming months, with three of seven models surveyed by the Bureau indicating this cooling will be enough to reach La Niña thresholds in spring, with the remaining four models staying neutral.
The Southern Annular Mode (SAM) index has recently been positive, but is forecast to return to neutral levels in the coming days, and remain so for at least the next two weeks.
The Madden–Julian Oscillation (MJO) is currently in the Western Hemisphere. Most climate models indicate the MJO will move towards Africa over the coming week, although climate models indicate the strength of the MJO could range from moderate to weak. An MJO near Africa typically means below average cloudiness and rainfall across much of much of India and parts of southeast Asia.
Alexis Rubinstein
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