How Unexpected Was the 2021 Pacific Northwest Heatwave?

Article Environmental Sciences

An anomalous warm-season trans-Pacific atmospheric river linked to the 2021 western North America heatwave

Ruping Mo et al.

Summary: Based on analyses of observation-based data and numerical weather prediction model output, this study reveals that a warm-season atmospheric river moved from Southeast Asia across the North Pacific in June 2021, contributing heat and moisture to a heatwave event in western North America. The movement of this system resulted in substantial spillover of moisture and sensible heat, forming a positive feedback mechanism that potentially led to the expansion of the heatwave event.

COMMUNICATIONS EARTH & ENVIRONMENT (2022)

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Article Environmental Sciences

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

James E. Overland

Summary: The extreme heat event that hit the Pacific Northwest in late June 2021 caused hundreds of deaths, loss of marine life, and forests. The event was triggered by the split of the polar vortex in the Arctic, accompanied by warming, which may represent a critical state in large-scale atmospheric circulation variability.

ATMOSPHERE (2021)

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Article Environmental Sciences

Increasing probability of record-shattering climate extremes

E. M. Fischer et al.

Summary: With the impact of global warming, the intensity and frequency of extreme heat events are constantly increasing, and this change mainly depends on the rate of warming rather than the level.

NATURE CLIMATE CHANGE (2021)

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Article Public, Environmental & Occupational Health

Heat-Related Emergency Department Visits During the Northwestern Heat Wave — United States, June 2021

Paul J. Schramm et al.

MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT (2021)

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Article Geosciences, Multidisciplinary

Ubiquity of human-induced changes in climate variability

Keith B. Rodgers et al.

Summary: Climate variability plays a crucial role in climate adaptation efforts, and greenhouse warming alters variance spectra of Earth system variables, leading to a wide range of changes. The modeling results have important implications for climate adaptation, resource management, seasonal predictions, and assessing stressors on terrestrial and marine ecosystems.

EARTH SYSTEM DYNAMICS (2021)

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Article Meteorology & Atmospheric Sciences