The New Asian-Bering-North American Index

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Asian-Bering-North American Index: To help quantify the existence and intensity of the “Alaska ridge-bridge” and downstream “Canadian polar vortex” pattern made famous during the 2013-14/2014-15 winter season a new daily index, the Asian-Bering-North American Index (ABNAI) is introduced. When a strong negative phase is present an upper level high pressure ridge is across the Bering Sea/Alaska and a downstream (polar vortex) trough across Ontario and vicinity. The pattern represents a very cold regime into the Central and East U.S. The current ABNAI is very negative and peaks Nov. 11-12 when the coldest U.S. temperatures should appear.