Building environmental simulation workflows is typically a slow process involving multiple proprietary desktop tools that do not interoperate well. In this work, we demonstrate building flexible, lightweight workflows entirely in Jupyter notebooks. We demonstrate these capabilities through examples in hydrology and hydrodynamics using the AdH and GSSHA simulators. The goal is to provide a set of tools that can easily be reconfigured and repurposed as needed to rapidly solve specific emerging issues. (https://pyviz.github.io/EarthSim/) As part of this work, extensive improvements were made to several general-purpose open source packages, including support for annotating and editing plots and maps in Bokeh and HoloViews, rendering large triangular meshes and regridding large raster data in HoloViews, GeoViews, and Datashader, and widget libraries for Param. In addition, two new open source projects are being released for triangular mesh generation and environmental data access.Presenter(s): Speaker: Dharhas Pothina, U.S. Army Engineer Research and Development Center Speaker: James A. Bednar, Solutions Architect, Anaconda, Inc. Speaker: Scott Christensen, U.S. Army Engineer Research and Development Center Speaker: Kevin Winters, U.S. Army Engineer Research and Development Center Speaker: Christopher Ball, Anaconda, Inc. Speaker: Gregory Brener, Anaconda Inc. Speaker: Philipp Rudiger, Software Engineer, Anaconda, Inc.