Fig. 1: The characteristics of the heatwave of summer 2021 over the Western North America (WNA, 40°−65°N, 125°−105°W).
From: Increased impact of heat domes on 2021-like heat extremes in North America under global warming
a Evolution of maximum temperature anomalies (relative to 1981-2010, unit: °C) in summer 2021 area-weighted averaged over the WNA (purple box in Fig. 1c). b Evolution of the anomalies of TXx7 (unit: °C) area-weighted averaged over the WNA during 1959–2021. TXx7 is defined as the annual summer (June–August) maxima of the 7-day running mean of the daily maximum temperature anomaly area-weighted averaged over the WNA. The red line indicates the TXx7 anomalies (27 June–3 July) for 2021. c The geopotential height anomalies (shading, unit: gpm) at 500 hPa for 27 June–3 July 2021. d The probability density functions (PDF) of the corrected TXx7 (see Methods) averaged over the WNA during 850–2005 for the 12-member realization of CESM1 last millennium ensemble (LME) simulation. The red dotted line indicates the TXx7 of 2021 from ERA5.
