La Nina continued during September 2010 as reflected by the large expanse of below-average sea surface temperatures (SST) across most of the equatorial Pacific Ocean. Consistent with nearly all the the forecast models, La Nina is expected to last at least in the Northern Hemisphere until spring 2011.
The impacts for the upcoming late fall, winter and early spring months would be a more active storm track through the northern and central Rockies. This would translate to above normal snowfall in southern Idaho and northern Utah and perhaps as far south as west-central Colorado.
The attached graph depicts the SST observed as of September 29th. The blue indicates colder than normal waters in the Pacific and the darker blue (-3 deg C), is where the coldest water has been measured.
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