Robust and thoroughly vetted resource adequacy analyses will be critical to maintaining reliable supply as the power sector undergoes the clean energy transition. Supported by GridLab, the GridPathRA Toolkit was developed to support advanced resource adequacy analysis for the Western United states. To improve transparency and accessibility, the Toolkit leverages publicly available data and the GridPath open-source power system model. It advances the characterization of three phenomena that will be increasingly important for understanding RA in future power systems: weather-driven relationships between load and resource availability; capabilities and constraints of energy limited resources; and transmission flows and regional coordination. To demonstrate the effectiveness of the Toolkit, a Western US 2026 resource adequacy analysis case study was developed. The seminar will discuss the Toolkit methodology and the case study results.