The Advanced Baseline Imager (ABI) onboard the Geostationary Operational Environmental Satellite-R (GOES-R) series currently is the best-in-class geostationary imager. It offers excellent georegistration, up to 500-m spatial resolution, as well as 10-min, 5-min, and 1-min imaging cadence over the full Earth disk, the continental US, and two mesoscale domains, respectively. In this talk, we highlight the improved observation of volcanic plumes and small-scale unsteady wake flows enabled by the high spatiotemporal-resolution of ABI. Through the examples of the 2019 Raikoke, 2021 La Soufrière, and the record-setting 2022 Hunga Tonga-Hunga Ha’apai eruptions, we demonstrate the retrieval of plume height and motion using newly-developed stereo and side-view methods. We also show that the high-frequency ABI imagery allows the analysis of rapidly varying atmospheric phenomena such as Lamb and gravity waves triggered by volcanic eruptions or Kármán vortex streets in the lee of Guadalupe Island, Baja California.