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Trending Up. La Nina Conditions for Winter 2016-2017

9 Nov 2016, 12:37 am

You may have heard the term El Niño and La Niña but have wondered how these two phenomenon can impact weather where you live.

Essentially,  El Niño and La Niña are the warm and cool phases of a recurring climate pattern across the tropical Pacific.

The pattern can shift back and forth irregularly every two to seven years, and each phase triggers predictable disruptions of temperature, precipitation, and winds here in the United States.

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Through much of September this year, a La Nina event did not look too favorable, but more recently it looks like an La Nina episode for the winter is more likely.
La Niña is favored to develop (~70% chance) during the fall months and slightly favored to persist (~55% chance) during winter 2016-17.


Both El Niño and La Niña can affect temperature and precipitation across the United States and has a stronger influence during the winter months.

General impacts from El Niño and La Niña events are illustrated below for winter months across the United States.  These impacts are associated with past events but not all impacts are present from event to event.

 

El Niño Winter Pattern

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La Niña Winter Pattern

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La Niña Winter Pattern

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