A Low-Frequency Downstream Development Process Leading to the Outbreak of a Mega-cold Wave Event in East Asia

An unprecedented cold wave swept through most parts of East Asia in January 2016, leading to record-breaking low temperatures and widespread snowstorms several regions. Our analysis indicated that this Asian was triggered by a series consecutive extreme events the Northern Hemisphere from late 2015 early 2016. (1) On 28 December 2015, severe cyclonic storm emerged North Atlantic, downstream blocking high formed Europe development process. The strong southerly jet stream between its steered into Arctic Circle, transported enormous warm moist air masses, establishing conveyor belts, which led an extraordinary warming event 2015. (2) This resulted distinct dipole pattern resembling negative phase Oscillation early–mid-January (3) induced eastward propagation Rossby occupation two highs Urals western America. These highs, together with pressure them, inverted omega-shaped circulation (IOCP) over Siberia–North Pacific region. Additionally, IOCP distinctly modulated meridional cell along Asia–Siberia regions, generated vorticity anticyclonic advection Siberian region, ultimately intensifying high. associated enhanced eventually outbreak mega-cold on 21–25