La Niña impacts on Pacific Northwest climate in spring: 2011 and the historical record Jim Johnstone JISAO-UW

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Presentation transcript:

La Niña impacts on Pacific Northwest climate in spring: 2011 and the historical record Jim Johnstone JISAO-UW

Niño 3.4 index

SST anomalies January 3, 2011

Sea-level pressure (SLP) anomalies March 2011 SOI

Niño 3.4 index SOI

Feb-Apr SOI Strongest spring La Niña on record (to 1866)

Lowest Apr-Jun Tmax in WA (to 1900)

Pac NW Precip Pac NW Tmax

Airport cloud ceilings (hours per day) SeaTac

Airport cloud ceilings (hours per day) SeaTac Portland

US Tmax anomalies Apr-Jun 2011 Record values (back to 1951)

Texas drought

April tornadoes

2011 monthly 500 mb anomalies (i.e. pressure) Feb Mar Apr May Jun Jul

April-Jun 500 mb anomalies

Strong La Niña that persisted into April Persistent and strong anomalies over the Pacific NW (and beyond) through June Cause and effect? Do Feb-Apr La Niña conditions occur with Apr-Jun anomalies over the Pacific NW?

Composite La Niña (Top 10) Dec-Feb 500 mb

Composite La Niña (Top 10) Dec-Feb 500 mb

Winter La Niña composites (Dec-Feb) Precip Tmax

La Nina winter composite 2011 Apr-Jun

Composite La Niña (Top 10) Feb-Apr 500 mb

Composite La Niña (Top 10) (Feb-Apr) Feb-Apr Mar-May Apr-Jun 500 mb

Tmax Apr-Jun 2011 Apr-Jun response to Feb-Apr La Niña

Composite La Niña (Top 10) (Feb-Apr) Feb-Apr Mar-May Apr-Jun Tmax

500 mb anomalies Apr-Jun 2011

Conclusion: Apr-Jun climate patterns similar to a typical La Niña pattern (Trough PNW, Ridge SE) But historical data shows limited effects of La Niña in spring

La NiñaUS tornadoes Spring (MAM) Z500 composite anomalies (normalized)

Top 5 Tmax

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