Seasonal Climate Forecast: October-December 2021

Seasonal Climate Forecast

September ¨C November 2024

Issued: August 15, 2024

Contact: ODF Lead Meteorologist Pete Parsons

503-945-7448 or peter.gj.parsons@odf.

ODA Team: Diana Walker; Andy Zimmerman; Jenn Ambrose; Taylor Harding

ODF Team: Julie Vondrachek; Kristin Cody

El Ni?o vs La Ni?a

(SST Patterns in the Tropical Pacific Ocean)

Courtesy:

Sea Surface Temperatures (SSTs)

Animated (PowerPoint only) SSTs (top) / Anomalies (bottom)

ENSO-neutral conditions are present

Courtesy:

El Ni?o Southern Oscillation (ENSO)

Current Status and Forecast

The July Southern Oscillation Index (SOI) was -0.7, which reflected

the recent transition to ENSO-neutral conditions.

?

The May ¨C July Oceanic Ni?o Index (ONI) fell to +0.2¡ãC, which

reflects cooling of central and eastern tropical Pacific Ocean sea surface

temperatures ¡°SSTs¡±¡­into the ENSO-neutral range.

?

NOAA¡¯s Climate Prediction Center (CPC) predicts continued cooling

of central and eastern tropical Pacific Ocean SSTs with a transition from

ENSO-neutral to La Ni?a during the September ¨C November period.

?

Note: This ¡°analog¡± forecast does not consider NOAA¡¯s ENSO forecast. It uses

only historical and current ENSO conditions to find ¡°analog years¡± that most-closely

match the recent evolution of the ENSO state.



Southern Oscillation Index (SOI)

(1957-1958; 1965-1966; 1991-1992)

La Ni?a

Top 3 June

SOI analogs

reflect

ENSO-neutral

conditions

ENSO-neutral

El Ni?o

July 2024 SOI

(-0.7) reflects

ENSO-neutral

conditions

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