Pacific northwest heat wave4/4/2023 ![]() ![]() And there is currently a broad consensus among climate researchers that such extreme events will occur much more frequently in the future than they do today. Unusually hot weather in India and Pakistan at the end of March a long, warmer-than-average summer in central Europe extreme December temperatures in northern Argentina, Uruguay and Paraguay: 2022 was definitely a year of heat waves. In each trajectory, all terms are set to zero for trajectory times before the respective t g. Colored lines show the evolution of T′, advective T′, adiabatic T′ and diabatic T′ within these trajectories in Kelvin (right y axis). ![]() Gray shading (left y axis) denotes the fraction of trajectories for which t g ≤ t for each trajectory time t. f, Formation pathway of T′, averaged for all trajectories arriving within the heat-wave region during 28–30 June 2021. Trajectories are plotted only for trajectory times after the respective anomaly genesis (for trajectory times t for which t g ≤ t) and are colored according to their respective T′ ( t). e, The trajectories of air parcels arriving at Lytton (121.5° W, 50.0° N, marked with a black cross in a–e) during the same period. a–d, T′ ( a), advective T′ ( b), adiabatic T′ ( c) and diabatic T′ ( d) averaged for 28–30 June 2021. ![]() 2021 Pacific Northwest heat-wave anomaly decomposition. ![]()
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