winter season outlook for the pacific northwest winter 2009 2010 l.
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Winter Season Outlook for the Pacific Northwest: Winter 2009/2010 Acknowledgement: NWS Climate Prediction Center www.cpc.noaa.gov El-Nino Status El Ni ñ o is present across the equatorial Pacific Ocean.

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winter season outlook for the pacific northwest winter 2009 2010
Winter Season Outlook for the Pacific Northwest:Winter 2009/2010

Acknowledgement: NWS Climate Prediction Center

www.cpc.noaa.gov

el nino status
El-Nino Status
  • El Niño is present across the equatorial Pacific Ocean.
  • Sea surface temperatures (SST) remain +0.5 to +1.5 above-average across much of the equatorial Pacific Ocean.
  • El Niño is expected to strengthen and last through Northern Hemisphere winter 2009-10.
historical trends
Historical Trends

1982-83

1997-98

2007-08

1998-00

1988-89

in summary
In Summary
  • ‘El Nino’ conditions are occurring and expected to continue through the cool season
  • Can expect this Winter to be (on average):
    • Temperature – increased odds on warmer than normal conditions
    • Precipitation – increased odds on below average conditions
    • Mountain Snowpack – increased odds at a below average snowpack
  • Can always expect some significant winter weather in the Pacific Northwest!
significant winter weather relative to enso phase
Significant Winter Weather Relative to ENSO Phase
  • Major floods
    • ENSO neutral
    • La Niña
    • El Niño (Nov 2006)
  • Major wind storms
    • La Niña
    • ENSO neutral
    • El Niño (Dec 2006 – Hannakah Eve Wind Storm)
  • Lowland snow events
    • La Niña
    • ENSO neutral
    • El Niño  (Nov 2006 – Monday Night Football )

Snoqualmie River…..er – Lake?

stay up to date
Stay Up To Date

NOAA’s Climate Prediction Center (CPC) issues its seasonal forecast update on the third Thursday of each month.

Winter weather outlook can be found at:

www.cpc.noaa.gov/products/predictions/90day/

or

via our web site headline atwww.weather.gov/seattle