Predicted winter temperature pattern for the U.S. based on La Nina winter conditions. Warm weather is likely across the Southern Plains; chilly temperatures can be expected along the West Coast and along the northern states into the Great Lakes.
On Thursday, October 20, 2011, the National Ocean and Atmospheric Administration (NOAA) released its weather outlook
for the period December 2011 through February 2012 (meteorological winter). Meteorological seasons begin on the first day of the month in which astronomical winter begins.
Overall, it’s an easy to understand forecast. La Nina
hasn’t gone away and is, in fact, going to strengthen a bit. This keeps the southern jet stream across the U.S. weaker than might otherwise be expected. It is also linked to a stronger western U.S. upper level ridge and a deeper trough in the region from the Mississippi Valley to the Appalachians.
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