This bill reauthorizes the National Landslide Preparedness Act through fiscal year 2030, significantly increasing its annual funding. The authorized appropriation for the United States Geological Survey rises from $25,000,000 to $35,000,000 annually, with a dedicated minimum of $10,000,000 for the purchase, deployment, and repair of landslide early warning systems in high-risk areas. This aims to enhance immediate safety measures and bolster overall preparedness.

The legislation expands the scope of landslide preparedness by incorporating new definitions for "atmospheric river," "atmospheric river flooding event," and "extreme precipitation event." These definitions are integrated into both the Flood Level Observation, Operations, and Decision Support Act and the National Landslide Preparedness Act, ensuring that risks from these severe weather phenomena are explicitly addressed in hazard assessments and mitigation strategies. Additionally, the bill broadens stakeholder engagement by formally including Native Hawaiian organizations and Tribal organizations in various program activities and grant eligibility.

Key program enhancements include requiring the national strategy to assess landslide risks specifically from atmospheric river flooding and extreme precipitation events. The National Landslide Hazards Database will now identify areas vulnerable due to hydrology changes, atmospheric events, geologic activity, and data-poor regions. Furthermore, the bill establishes new regional partnerships, starting with Alaska, to leverage local expertise, coordinate research, and align monitoring efforts tailored to specific regional landslide challenges.

Interagency coordination is strengthened by adding the Administrator of the National Aeronautics and Space Administration to the Interagency Coordinating Committee on Landslide Hazards. The 3D Elevation Program is also reauthorized through 2030, with updates to include derivative data and integrate the 3D Hydrography Program Working Group into its coordinating committee. These provisions collectively aim to improve data acquisition, analysis, and collaborative efforts for more effective landslide hazard assessment and mitigation nationwide.