Island Climate Update

A monthly summary of the climate in the tropical South Pacific islands, with an outlook for the coming months. This bulletin is a multi-national project with collaboration from a number of Pacific nations and support from various organisations.

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Issues

Island Climate Update 247 - April 2021

The NINO3.4 Index anomaly (in the central Pacific) during March was -0.44˚C. This marked the first time since August 2020 that SSTs in this region were in the neutral range. The SOI value for March was +0.1 (in the neutral range).

Island Climate Update 246 - March 2021

The NINO3.4 Index anomaly (in the central Pacific) during January was -0.68˚C, entering ENSO “cool neutral” territory (-0.5 to -0.69˚C) for the first time since August 2020.

Island Climate Update 245 - February 2021

The NINO3.4 Index anomaly (in the central Pacific) during January was 0.81˚C, increasing slightly compared to the previous month.

Island Climate Update 244 - January 2021

The NINO3.4 Index anomaly (in the central Pacific) for the last month (through the 3 rd of January) was 0.84˚C, increasing from 1.03˚C from last month.

Island Climate Update 243 - December 2020

During November, the NINO3.4 Index anomaly (central Pacific) was 1.02˚C. The NINO 1+2 Index (eastern Pacific) was 0.54 C. The most unusually cool SSTs have now shifted into the central Pacific.

Island Climate Update 242 - November 2020

During October, the NINO3.4 Index anomaly (central Pacific) was 0.86˚C. The NINO 1+2 Index (eastern Pacific) was 0.56 C. Upper oceanic heat content continued to decrease in the east central part of the Pacific basin.

Island Climate Update 241 - October 2020

During September, the NINO3.4 Index anomaly (central Pacific) was 0.71˚C. The NINO 1+2 Index (eastern Pacific) was 0.76 C.

Island Climate Update 240 - September 2020

During August, the NINO3.4 Index anomaly (in the central Pacific) was 0.42˚ C. The NINO 1+2 Index (eastern Pacific) was 0.85 C.

Island Climate Update 239 - August 2020

During July, the NINO3.4 Index anomaly (in the central Pacific) was +0.04˚C. The NINO 1+2 Index (eastern Pacific) was 0.72 C, decreasing from 0.57 C in June.

Island Climate Update 238 - July 2020

During June, the NINO3.4 Index anomaly (in the central Pacific) was 0.12˚C. Upper oceanic heat content decreased notably across the east central equatorial Pacific.

Island Climate Update 237 - June 2020

During May the NINO3.4 Index anomaly (in the central Pacific) for May was +0.01˚C, with upper oceanic heat content continuing to decrease across the equatorial Pacific.

Island Climate Update 236 - May 2020

El Niño Southern Oscillation (ENSO) neutral conditions continued during April 2020. The Southern Oscillation Index (SOI) was +0.1.

Island Climate Update 235 - April 2020

El Niño Southern Oscillation (ENSO) neutral conditions continued during March 2020. The Southern Oscillation Index (SOI) was 0.5.

Island Climate Update 234 - March 2020

El Niño Southern Oscillation (ENSO) neutral conditions continued during February 2020. The Southern Oscillation Index (SOI) was 0.2.

Island Climate Update 233 - February 2020

El Niño-Southern Oscillation (ENSO) neutral conditions continued during January 2020. The Southern Oscillation Index (SOI) was +0.2, the first positive monthly value since December 2018.

Island Climate Update 232 - January 2020

El Nino –Southern Oscillation (ENSO) neutral conditions continued during December 2019. Both the Southern Oscillation Index (SOI) and sea surface temperatures (SSTs) remained on the El Niño side of neutral but weakened compared to previous months.

Island Climate Update 231 - December 2019

ENSO-neutral conditions continued during November 2019, although the Southern Oscillation Index (SOI) dipped into El Niño territory and sea surface temperatures (SSTs) were on the El Niño side of neutral.

Island Climate Update 230 - November 2019

ENSO-neutral conditions continued during October 2019, although the Southern Oscillation Index (SOI) and sea surface temperatures (SSTs) were on the El Niño side of neutral.

Island Climate Update 229 - October

Upper-oceanic heat content anomalies continued to decrease in the eastern and east-central equatorial Pacific during September. The core of the warm pool that had been associated with a central Pacific El Niño earlier in the year was located just west of the International Dateline.

Island Climate Update 228 - September

Upper-oceanic heat content anomalies continued to decrease, but remained slightly above average in the west-central equatorial Pacific.

Island Climate Update 227 - August 2019

During July 2019, SSTs dipped below El Niño thresholds in the central Pacific for the first time in 5 months.

Island Climate Update 226 - July 2019

During June 2019, the atmosphere continued to respond to a warm pool of water in the central and western Pacific, with above normal rainfall and cloud centred along and just west of the International Dateline.

Island Climate Update 225 - June 2019

During May 2019, the atmosphere continued to respond to a warm pool of water in the central and western Pacific.

Island Climate Update 224 - May 2019

During April 2019, the atmosphere once again responded to a warm pool of water in the central and western Pacific, withabove normal rainfall and cloud centred along and just west of the International Dateline

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