Figure 1: a) Forecasted temperature anomaly over western North America for the period 18th – 22nd March 2026. The study region is shown in dark blue. b) Seasonal cycles of daily maximum temperature within the study region shown in panel (a) for all years since 1950 (shown as thinner lines, coloured blue-red depending on proximity to present day), with 2026 shown in black. The bold red and blue lines show the present (1995-2025) and past (1950-1980) climatology. Data: ERA5.