THE WEATHER AND CIRCULATION OF JANUARY 1965 Mild in the West and Cold in the East

• Main Author: James F. Andrews
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Arctic; Arctic Ocean; Bering Sea; Pacific; aleutian low
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.395.2879; http://docs.lib.noaa.gov/rescue/mwr/093/mwr-093-04-0269.pdf

A ma.rked decrease of oceanic blocking in January was accompanied by a sharp increase in the zonal index. In the Pacific the strong blocking ridge and area of positive 700-mb. height anomaly, which was over the Bering Sea in December [I], moved northward in January. This blocking was associated with the High over the Arctic Ocean on the mean 700-mb. Circulation for January (fig. 1) and its related area of positive height anomaly (fig. 2). The mid-Pacific westerlies also were displaced northward (from December) but were still south of their normal position for January (fig. 3). At sea level the Aleutian Low and nccompanying principal storm tracks were slightly south of their expected positions in January. The westerlies also shifted northward over the eastern Pacific and western North America. Here westerly cy-