From:  Excerpts from Oregon Department of Agriculture report, August 18, 2010

Last winter's moderate to strong El Nino has ended, with sea-surface temperatures in the equatorial Pacific Ocean rapidly cooling to below normal. La Nina (cooler than normal tropical Pacific Ocean sea-surface temperatures) has developed, with most computer models forecasting the conditions to strengthen this autumn and last at least through this coming winter.

Forecast Sept-Nov 2010 (Based on 1958, 1964, 1966, 1973, 2007).

• Near average temperatures indicated for the 3-month period.
• Elevated chance of a wet November skew the 3 month precipitation anomaly above normal (mainly west).
• Increased chance of windstorms (west) and early season mountain snowfall.

Preview Winter 2010-11.

• Above average mountain snow.
• Above average low-elevation snow and valley rain, with an increased chance of valley snow and/or flooding.
• Increased threat of windstorms (west).
• Increased threat of Arctic intrusions.

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