The National Oceanic and Atmospheric Administration (NOAA) says La Nina returned in August and is expected to strengthen into the winter.
"The better model performance, combined with the historical tendency for significant La Nina episodes (as in 2010-11) to be followed by relatively weaker La Nina episodes, leads to increased confidence that La Nina will persist into the winter," states NOAA. "While it is not yet clear what the ultimate strength of this La Nina will be, La Nina conditions have returned and are expected to gradually strengthen and continue into the Northern Hemisphere winter 2011-12."
NOAA says across the contiguous United States, temperature and precipitation impacts associated with La Nina are expected to remain weak during the remainder of the Northern Hemisphere summer and early fall, and to generally strengthen during the late fall and winter. "During September-November 2011, there is evidence that La Nina favors an increased chance of above-average temperatures across the mid-section of the country, and an increased chance of above-average precipitation across the Pacific Northwest," it says.
Juli says: As many meteorologists predicted, La Nina is back. If weather conditions associated with La Nina are seen this winter, then Midwest soil moisture deficits will be alleviated, although it provides little hope for relief to the Southern Plains drought.