SOME FEATURES OF THE HEMISPHERIC CIRCULATION

• Main Author: Arthur F. Krueger
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 1954
• Subjects: Arctic; Gulf of Alaska; Greenland; Alaska; Siberia
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.394.7323; http://docs.lib.noaa.gov/rescue/mwr/082/mwr-082-12-0374.pdf

During December abnormally strong westerlies prevailed at high latitudes, but at 700 mb. wind speeds were subnormal at middle latitudes (fig. 1). This condition was associated with an elongated area of below normal 700-mb. heights extending from the Gulf of Alaska across the Polar basin to Greenland, and then southeastward into Europe, with the greatest negative anomaly (-440 feet) located in a closed cyclonic vortex over the American Arctic (fig. 2). This area was surrounded by positive height anomalies which were for the most part centered north of 45 " N. latitude. The most intense of these positive anomalies was situated in a strong ridge over northern Siberia, where heights were 490 feet above normal and sea level pressures were 18 mb. above normal. On the western side of this