The upper air pattern projected across Europe during the next 1-2 weeks features a deep upper-level low-pressure trough causing chilly weather for the next 10 days (at least) and excessive rainfall capable of producing flooding in parts of central, south, and southeast portions of Europe. Heavy snows are likely in the South-central Europe mountain areas, and the wet regime extends eastward to include Ukraine.

Typical of a La Nina climate, the Northwest U.S./Southwest Canada to North-central U.S. are usually the first winter targets for cold and snow. The NOAA/CPC risk of heavy snow ALERT for the last week of November indicates heavy snow risk for the Continental Divide and North-central U.S. likely to sustain following cold.

The approach of December brings developing and widening Great Plains snow cover, a mostly drier than normal to above normal rainfall pattern change in Brazil, and arrival of snowfall across the bare ground in the northern half of Europe.

The outlook valid through FEB-26 includes a stormy winter across the Northern U.S. while the southern portion of the U.S. is dry. In South America, dryness generates in Northeast Argentina/Southeast Brazil plus Northeast Brazil. Wet weather is likely for northwestern South America.