# IRI – International Research Institute for Climate and Society | September Climate Briefing: Surprise La Niña or Ephemeral Cooling?

> The IRI September climate briefing reports that central equatorial Pacific sea-surface temperatures have continued to cool, with weekly anomalies between -0.6C and -0.2C, approaching La Nina levels. Atmospheric and sub-surface ocean indicators also point toward possible La Nina, and NOAA's CPC upgraded its ENSO status to a La Nina Watch.

- Date: 2017-09-28 · published 2017-09-28T12:00:00.000Z
- Category: weather · region Global · magnitude medium
- Page: https://feedsoft.ai/events/68869-iri-international-research-institute-for-climate-and-society-september-climate
- Commodities: [Soybeans](https://feedsoft.ai/c/SOY.md), [Corn](https://feedsoft.ai/c/CORN.md), [Soybean Meal](https://feedsoft.ai/c/SBM.md), [Wheat (SRW)](https://feedsoft.ai/c/WHEAT.md)

## Why it matters

A developing La Nina raises the risk of dry conditions in Argentina and southern Brazil during the coming South American growing season, which could tighten soybean, corn and meal supplies and support prices. Its effect on the US crop is expected to be limited, since the event is not expected to last into the US growing season.

## Read by commodity

- SBM: bullish ▲
- SOY: bullish ▲
- CORN: bullish ▲
- WHEAT: neutral

## Similar past events

| Commodity | Date | Event | 5-day % | 20-day % |
| --- | --- | --- | --- | --- |
| SOY | 2020-10-23 | [IRI – International Research Institute for Climate and Society \| October Climate Briefing: La Niña Comes Knocking](https://feedsoft.ai/events/50562-iri-international-research-institute-for-climate-and-society-october-climate.md) | -2.0% | +9.7% |
| SOY | 2017-12-27 | [IRI – International Research Institute for Climate and Society \| December Climate Briefing: New Year, Same La Niña](https://feedsoft.ai/events/67399-iri-international-research-institute-for-climate-and-society-december-climate.md) | +0.1% | +3.4% |
| SOY | 2020-07-21 | [IRI – International Research Institute for Climate and Society \| July Climate Briefing: La Niña Watch Issued](https://feedsoft.ai/events/52035-iri-international-research-institute-for-climate-and-society-july-climate.md) | +0.4% | +1.1% |
| SOY | 2020-08-20 | [IRI – International Research Institute for Climate and Society \| August Climate Briefing: La Niña Seeming More Likely](https://feedsoft.ai/events/51518-iri-international-research-institute-for-climate-and-society-august-climate.md) | +0.8% | +12.7% |
| SOY | 2016-11-22 | [IRI – International Research Institute for Climate and Society \| November Climate Briefing: La Niña Arrives, Some Impacts Likely](https://feedsoft.ai/events/73773-iri-international-research-institute-for-climate-and-society-november-climate.md) | +2.2% | -1.5% |
| CORN | 2020-10-23 | [IRI – International Research Institute for Climate and Society \| October Climate Briefing: La Niña Comes Knocking](https://feedsoft.ai/events/50562-iri-international-research-institute-for-climate-and-society-october-climate.md) | +0.8% | +10.6% |
| CORN | 2017-12-27 | [IRI – International Research Institute for Climate and Society \| December Climate Briefing: New Year, Same La Niña](https://feedsoft.ai/events/67399-iri-international-research-institute-for-climate-and-society-december-climate.md) | +0.4% | +1.3% |
| CORN | 2020-07-21 | [IRI – International Research Institute for Climate and Society \| July Climate Briefing: La Niña Watch Issued](https://feedsoft.ai/events/52035-iri-international-research-institute-for-climate-and-society-july-climate.md) | -0.3% | +2.6% |

## Sources

- iri.columbia.edu: https://iri.columbia.edu/news/september-climate-briefing-surprise-la-nina-or-ephemeral-cooling/

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Data from Feedsoft AI (https://feedsoft.ai/). For information only; not investment advice.