Skymet weather

La Nina keeps cool, ENSO neutral during spring 2021

March 3, 2021 7:25 PM |

Monsoon 2021 forecast

During the last 4 weeks, sea surface temperatures (SST’s) continued to be below average across the equatorial Pacific Ocean. Apparently cooling is more prominent over West Central and Central Equatorial Pacific as compared to Eastern Equatorial Pacific. In the last week, easterly wind anomalies strengthened over the East-Central Pacific. In the last 2 months, -ve sub-surface temperature anomalies have persisted from Central to Eastern Pacific Ocean pointing to a cool thermocline (sea surface – 150mtr deep). This goes on to show that the Pacific Ocean is sufficiently mild albeit with a slow march towards neutral conditions.

La Nina

The numerical model averages predict La Nina to continue into the Northern Hemisphere Spring 2021, returning to ENSO-Neutral during April – June and persisting through fall 2021.

La Nina

The workhorse of Skymet, numerical model CFS.V2 ensemble mean predicts borderline La Nina conditions during late Spring and early summer before strengthening through fall 2021.

La Nina

SST’s in the Indian Ocean are slightly warmer than average across most parts. The latest weekly value of the Indian Ocean Dipole (IOD) index to 28th February was -0.15°C. Most models expect it to remain neutral through the springe.

IOD

Oceanic temperature is expected to become slightly cooler than average at the commencement of Southwest Monsoon season. No big support may come from IOD in the initial phase of the monsoon.






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