UD C 651.606.1: 661.613: 661.624.38 (73) ‘‘1972.12” WEATHER AND CIRCULATION OF DECEMBER 1972 Record Cold in the West

• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Hudson; Hudson Bay; Alaska
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.395.1598; http://docs.lib.noaa.gov/rescue/mwr/101/mwr-101-03-0281.pdf

Two strong blocking ridges, one located near Alaska and the other over Europe, were primary features of the mean 700-mb circulation for December 1972 (figs. 1, 2). These ridges were separated by a mean trough that extended across the North Bole from northern Asia into the Atlantic Ocean, giving rise to a basically simple two-wave configuration in the mean circulation at higher latitudes. This basic pattern represented a significant change from the mean circulation of November 1972 (Dickson 1973), resulting in large month to month anomalous height changes over the region (fig. 3). Southern extensions of the polar trough included mean troughs along the Asiatic coast, over North America from Hudson Bay to Mexico, and in the region of the Caspian Sea. Elsewhere, a broad ridge exerted its influence