La Niña will influence weather patterns across the country, for the second winter in a row, but it’s the ‘wild card’ factor that is the less predictable Arctic Oscillation that could produce dramatic short-term swings in temperatures this winter. La Niña is associated with cooler than normal water temperatures in the tropical Pacific Ocean and influences weather throughout the world.

However, mitigation and prevtion measure are being taken with this important data. Data gathered from the model will support local weather forecast office efforts to prepare for and protect the public from weather events. This service is helping the country to become more alert at a time when extreme weather is on the rise.
Article Here:
http://www.noaanews.noaa.gov/stories2011/20111020_winteroutlook.html