Typicality of the 2021 Western North America summer heatwave

Elucidating the statistical properties of extreme meteo-climatic events and capturing physical processes responsible for their occurrence are key steps improving our understanding climate variability change better evaluating associated hazards. It has recently become apparent that large deviation theory is very useful investigating persistent events, specifically, flexibly estimating long return periods introducing a notion dynamical typicality. Using methodological framework based on taking advantage simulations by state-of-the-art Earth System Model, we investigate 2021 North America Heatwave. Indeed, analysis shows event can be seen as an unlikely but possible manifestation variability, whilst its probability greatly amplified ongoing change. We also clarify spatial coherence heatwave elucidate role played Rocky Mountains in modulating hot, dry, Western Pacific region America.