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The large-amplitude ridge in the eastern Pacific Ocean (described by Stark (Ill in the preceding article) caused most of the storms moving eastward across the western Pacific Ocean to be diverted northward over the Bering Sea or western Alaska during January 1957. This pattern also was favorable for cyclogenesis over the area to the northeast of the Hawaiian Islands. In this paper one of these storms is discussed from its arrival near the coast of Oregon until it reached the Central Plains States. Prior to arrival off the west coast, the storm had followed a. circuitous path across the eastern Pacific Ocean. As the storm stagna.ted near the mouth of the Columbia River, its energy caused cyclogenesis which moved east- ward across southern Oregon, southern Idaho, and Wyo- ming, reaching northeastern Colorado during the 24-hour period. An attempt wiII be made to describe the weather and changes associated with the movement of this storm. 2. ANTECEDENT CONDITIONS

A STORM OVER THE PLATEAU, JANUARY 20–21, 1957