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Climate outlook for Water Year 2012

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tehya
17 diapositives · 290 Views · Jul 16, 2014

This report by Nate Mantua, PhD from the University of Washington, outlines the climate outlook for the Pacific Northwest (PNW) as we enter Water Year 2012. It anticipates continued weak to moderate La Niña conditions throughout winter, influencing the odds of cooler and wetter weather. Historical patterns suggest that back-to-back La Niña events can lead to significant windstorms and road closures in the Cascades, emphasizing the complex interplay of climate factors. The forecast aims to prepare for potential weather challenges in the region.

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Climate outlook for Water Year 2012
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  1. Climate outlook for Water Year 2012 Nate Mantua, PhD University of Washington JISAO Climate Impacts Group November 2, 2011

  2. Last year, mid-October: cool tropics and La Niña

  3. IRI Forecasts from September 2010:odds favored a wet PNW fall, and cool along the coast OND temperature OND precipitation http://portal.iri.columbia.edu/portal/server.pt

  4. IRI Forecasts from September 2010:odds favored for a cool/wet PNW winter JFM temperature JFM precipitation http://portal.iri.columbia.edu/portal/server.pt

  5. OND 2010 precip JFM 2011 precip OND 2010 temp JFM 2011 temp

  6. This year?

  7. Cool tropics and another La Niña

  8. Pacific Climate Outlook • forecasts centered on a weak/moderate La Niña event now through winter 2012 • PDO: cool phase sustained with help from La Niña Forecast summaries European Center 2011 2012 2011 2012

  9. Typical US Temperature, Precipitation and Jet Stream Patterns during La Niña Winters

  10. Major PNW windstorms favored in ENSO neutral/weak La Niña years (slide provided by Cliff Mass, UW)

  11. Cascade pass road closures and ENSO(slide from Nick Bond, Washington State Climatologist) • No simple story with La Niña or El Niño on pass closure dates! Dec 1 Nov 1

  12. 2nd year of a back-to-back La Niña series? 1st year temp JFM OND 2nd year temp OND JFM

  13. 2nd year of a back-to-back La Niña series? 1st year precip JFM OND 2nd year precip OND JFM

  14. IRI forecasts from October 2011 NDJ Temperature NDJ Precip http://portal.iri.columbia.edu/portal/server.pt

  15. IRI forecasts from October 2011 JFM Temperature JFM Precip http://portal.iri.columbia.edu/portal/server.pt

  16. NOAA/CPC U. S. Seasonal Outlooks NDJ temperature NDJ precip FMA precip FMA temperature The seasonal outlooks combine the effects of long-term trends, soil moisture, and ENSO. Issued October 20, 2011

  17. The Bottom line • expectation for weak/moderate La Niña conditions to continue through winter and into spring tilts the odds in favor of a cool and wet fall and winter for the PNW region • Additional influences from cool phase PDO conditions should bolster these odds • 2nd of back to back La Niña winter patterns does not appreciably change this outlook; expectations for a weaker La Niña than last winter’s probably more important than the back-to-back factor