Concentrated and Intensifying Humid Heat Extremes in the IPCC AR6 Regions

Extreme humid heat events have seen rapid increases globally in recent decades, but regional changes and higher-order temporal characteristics, such as interannual intra-annual clustering, not been widely explored. Using ERA5 reanalysis data from 1979 to 2019, we find increasing trends of varying magnitudes extreme wet-bulb temperatures at the Intergovernmental Panel on Climate Change Sixth Assessment Report (IPCC AR6) scale. In many locations, variations extremes show a strong relationship with El Niño-Southern Oscillation. The proximity precipitation days arid regions suggests that local moisture effects may lead clustering. Knowledge these spatial patterns aids understanding how potential stress is increasing, well facilitates development regionally specific adaptation mitigation strategies for combating associated societal impacts.