In every month from November to April that year, blocking events occurred, causing storms to shift south. All time record seasonal snow totals were found in most of the major cities. This year, monthly and even seasonal snowfall records fell from the eastern Great Lakes to northern New England. Climate Prediction Center composite of La Nina winter snowfall relative to normal for winters when the NAO averages a positive. Above normal snows are limited to the Rockies and North Central and parts of the Midwest.
Storms tracking into Canada bring more rain and less snow to the East.
Climate Prediction Center composite of La Nina winter snowfall relative to normal for winters when the NAO averages negative. It tends to blow alternatively east and west at intervals that average 13 or so months. Bill Gray uses the Quasi-Biennial Oscillation in his hurricane forecasting scheme. Researchers at the Climate Prediction Center and NCAR have shown in the Journal of Climate that the direction QBO seems to reliably alter the patterns associated with both El Nino and La Nina. One of the important differences may be with regards to the Atlantic.