Harris County, Texas, which includes the city of Houston, has completed an after action report (AAR) on its response to Hurricane Harvey, which made landfall near the city on August 25, 2017. Harvey brought high winds and floodwaters and became tied with Hurricane Katrina as the costliest tropical cyclone on record. The AAR includes a summary of Hurricane Harvey, including the storm’s timeline and its impacts on Harris County, before embarking on discussions of strengths and areas for improvement observed during the incident. While this AAR is specific to Harris County, many of the best practices and lessons learned it underscores are not, providing other jurisdictions an opportunity to learn and prepare themselves for potential adverse events. Harris County Office of Homeland Security and Emergency Management.