When Thunderstorms Reach the Stratosphere: Why Storm Structure May Matter for Climate

Abstract Deep convection that overshoots the tropopause provides one of the fastest pathways for exchanging air between the troposphere and the stratosphere. Using extensive in situ observations from the dynamics and chemistry of the summer stratosphere (DCOTSS) campaign, Shepherd et al. (2026, https://doi.org/10.1029/2025JD045514 ) showed how storm‐scale characteristics and environmental conditions shape the magnitude, depth, and pathways of stratosphere‐troposphere exchange in the midlatitudes. Their analysis indicates that storms producing above‐anvil cirrus plumes, as well as large mesoscale convective systems, are associated with disproportionately strong stratospheric perturbations, particularly in water vapor. This Commentary places these results in a broader context, highlights the main conceptual advances enabled by DCOTSS, and discusses remaining uncertainties while outlining priorities for future work. In particular, it argues that the main significance of these results lies not in resolving the large‐scale stratospheric water vapor budget, which remains uncertain, but in helping identify which storm classes and physical pathways are most likely to matter if such impacts are to be quantified more robustly.