Sea-surface temperatures across the Equatorial Pacific Ocean continue to be cooler than average by about 1 to 2 degrees in most areas. This indicates that the La Nina phase, which developed during the summer, is maintaining strength. Current climate models suggest this La Nina will persist until at least the first part of 2011.
This La Nina is expected to affect fall and winter temperatures across the nation. During October and November, mean temperatures are forecasted to be slightly warmer than average across much of the Midwest,
Early season heating degree-days will be lower than normal by between 60 to 120 across these portions of the country. The Desert Southwest likely will see mild weather, which will result in small heating degree-day deficits. Portions of the northern Rockies and