Causes of the Record-Breaking Pacific Northwest Heatwave, Late June 2021

نویسندگان

چکیده

The extreme heat event that hit the Pacific Northwest (Oregon, Washington, southern British Columbia) at end of June 2021 was 3 °C greater than previous Seattle record 39 °C; larger extremes 49 were observed further inland 6 above record. There hundreds deaths over region and loss marine life forests. At large scale prior to event, polar vortex split Arctic. A instability center formed Bering Sea then extended southward along west coast North America. associated tropospheric trough (low geopotential heights) established a multi-day synoptic Omega Block (west-east oriented low/high/low centered Northwest. Warming sustained in due subsidence/adiabatic heating solar radiation, which main reasons for such temperature extremes. seasonal transition spring suggests possibility excursion vortex/jet stream pair. Both Siberian heatwave climax 2020 may be examples crossing critical state large-scale atmospheric circulation variability.

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ژورنال

عنوان ژورنال: Atmosphere

سال: 2021

ISSN: ['2073-4433']

DOI: https://doi.org/10.3390/atmos12111434