Fig. 4: Temperature and circulation anomaly during 2021 Pacific Northwest (PNW) heatwave and storylines.
From: Storylines for unprecedented heatwaves based on ensemble boosting

a, c, e, g, i, k Daily maximum temperature anomaly and (b, d, f, h, j, l) 500hPa geopotential height anomaly during the hottest 5-day period over the PNW for the (a, b) 2021 heatwave in ERA5 and (c–l) for the maximum boosted model experiments Events A–E.