Partially derived from former Super Typhoon Nuri, the typhoon's remnants joined up with the polar jet stream and a very strong disturbance in the mid-latitude belt of westerly winds, leading to explosive development of low pressure.
As a result, the Bering Sea storm whipped up hurricane-force winds in parts of Alaska's Aleutian Islands as well as giant waves in the Bering Sea over the weekend.
On Saturday morning, U.S. time, the low was analyzed by NOAA to have a pressure of 924 millibars. The National Weather Service in Anchorage said the storm may be one of the five deepest extratropical (non-tropical) low pressure systems on record in the North Pacific, as determined by minimum pressure.
http://preview.weather.com/storms/hurricane/news/bering-sea-superstorm-alaska-aleutians-20141105
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