The Aleutian, Icelandic, and Southern Hemisphere Upper-Midlatitude Lows
Finally, the actual configuration of the Upper-Midlatitude Low between the Polar and Subtropical Highs needs to be reexamined. In the Northern Hemisphere in January (Fig. 10-3a) when both the Polar and Subtropical Highs are apparent, one over each subarctic ocean. These are the Aleutian Low in the northeastern Pacific off Alaska and the Icelandic Low in the North Atlantic centered just west of Iceland. The convergence and ascent of air within these cells are more complex than this still rather generalized map suggests; thus these features are covered in greater depth in the discussion of air masses and storm systems of the midlatitudes in Unit 14. For the time being we also note that these cells, too, weaken to the point of disintegration during the summer (Fig. 10-3b).
The Aleutian, Icelandic, and Southern Hemisphere Upper-Midlatitude Lows Finally, the actual configuration of the Upper-Midlatitude Low between the Polar and Subtropical Highs needs to be reexamined. In the Northern Hemisphere in January (Fig. 10-3a) when both the Polar and Subtropical Highs are apparent, one over each subarctic ocean. These are the Aleutian Low in the northeastern Pacific off Alaska and the Icelandic Low in the North Atlantic centered just west of Iceland. The convergence and ascent of air within these cells are more complex than this still rather generalized map suggests; thus these features are covered in greater depth in the discussion of air masses and storm systems of the midlatitudes in Unit 14. For the time being we also note that these cells, too, weaken to the point of disintegration during the summer (Fig. 10-3b).
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