Fig. 5From: Unprecedented warming in Northwestern India during April of 2022: roles of local forcing and atmospheric Rossby waveRegression of the PC2 with a geopotential height at 200 hPa (contours; m) and b Rossby wave source (s−2) during April from 1979 to 2022. The significant results are marked in a. The green contours in b represent the mean zonal winds at 200 hPa during April from 1979 to 2022, and the gray contours are Rossby wave trajectories along the wave pathways (the initial positions are marked). The black box marks the region from 25°N to 40°N and from 80°W to 50°WBack to article page