11/02/2020, 2:17 pm EST

La Nina’s Increasing Strength Reflected in Emerging Strong Negative Pacific North America Pattern

-PNA patterns represent a persistent cold upper trough over Southwest Canada and/or the Western U.S. Frequently, -PNA patterns are compensated for by an upper ridge across the East U.S. associated with positive North Atlantic oscillation (+NAO). The described pattern is fully developed in the 6-10 day period and likely to linger through the 11-15 day timeframe.