What changed between these versions
A substantive modification. V2 updates the short title to "Snow Water Supply Forecasting Program Reauthorization Act of 2026" and significantly expands the program's focus on developing more accurate and cost-effective snow monitoring and water supply forecasting technologies, including exploring new statistical and machine learning models. Concurrently, the authorized funding for fiscal years 2027 through 2031 is reduced from $6,500,000 to $3,000,000 annually.
Overview
A handful of changes across several subsections of the Snow Water Supply Forecasting Program Authorization Act. · V2 refines and expands the program's technological focus on forecasting methods while simultaneously narrowing the authorized funding levels.
The most significant changes in v2 involve a broadened emphasis on developing more accurate, timely, and cost-effective snow monitoring and water supply forecasting technologies, including the explicit exploration of new statistical and machine learning models. The reporting requirements are expanded to include an assessment of these new forecasts against benchmarks. However, the authorized annual appropriation for fiscal years 2027 through 2031 is reduced by more than half compared to v1.
Modifications
This is a minor administrative change, updating the year in the bill's short title.
Before
The Act would be cited as the "Snow Water Supply Forecasting Program Reauthorization Act of 2025".
After
The Act would be cited as the "Snow Water Supply Forecasting Program Reauthorization Act of 2026".
This broadens the technological focus of the program, encouraging a wider range of innovations beyond just integrated modeling, specifically targeting improved accuracy, timeliness, and cost-effectiveness in both monitoring and forecasting.
Before
The program's development activities would emphasize "development and deployment of technologies that integrate snowpack measuring and modeling."
After
The program's development activities would "continue developing" and emphasize "development and deployment of more accurate, timely, and cost-effective snow monitoring technologies and water supply forecasting, including technologies that integrate snowpack measuring and modeling."
This clarifies and expands the program's stated purpose, directly linking snowpack measurement improvements to the ultimate goal of better water supply forecasting, rather than just measurement itself.
Before
This part of the program's purpose was to "improve snowpack measurement in particular watersheds."
After
This part of the program's purpose is to "improve snowpack measurement in particular watersheds and to improve water supply forecasting."
This aligns the heading with the expanded focus of the program on overall water supply forecasting methods, not just integrated modeling.
Before
The paragraph heading for technologies was "Snowpack measurement data with integrated modeling."
After
The paragraph heading for technologies is "Snowpack measurement data and water supply forecasting."
This further emphasizes the shift from solely focusing on models to a broader consideration of various methods used in water supply forecasting.
Before
The technologies listed were for "snowpack measurements and models."
After
The technologies listed are for "snowpack measurements and methods to forecast water supply."
This minor change broadens the scope of acceptable snowpack and hydrologic modeling technologies by removing the specific qualifier "integrated," allowing for a wider range of modeling approaches.
Before
One listed technology was "integrated snowpack and hydrologic modeling."
After
One listed technology is "snowpack and hydrologic modeling."
This allows the Secretary to consider and deploy a broader array of tools, including data analysis techniques, not just physical measurement technologies, to enhance water supply forecasting.
Before
This provision included "other technologies that the Secretary determines are likely to provide more accurate or timely snowpack measurement data to inform water management and reservoir operations."
After
This provision includes "other technologies that the Secretary determines are likely to provide more accurate or timely snowpack measurement data or analytical methods utilizing snowpack data that can improve water supply forecasting to inform water management and reservoir operations."
This clarifies that collaboration with specified agencies should encompass both snowpack measurement technologies and the models used in conjunction with them.
Before
This provision referred to "technologies for snowpack measurement, including the Department of Agriculture and the National Oceanic and Atmospheric Administration."
After
This provision refers to "technologies for snowpack measurement and models, including the Department of Agriculture and the National Oceanic and Atmospheric Administration."
This directs the program to actively research and integrate advanced modeling techniques, such as machine learning, into its forecasting efforts, potentially leading to more sophisticated and accurate predictions.
Before
The program would "advance snowpack measurement and water supply forecasts in particular watersheds."
After
The program would "advance snowpack measurement and water supply forecasts in particular watersheds and to explore new statistical, machine learning, or physical models to generate improved water supply forecasts utilizing snowpack data."
This refines the program's focus to emphasize the outcome of modeling (projected water supply) rather than a specific type of modeling (integrated), allowing for flexibility in methods while maintaining a clear objective.
Before
The program would focus on "snowpack measurement and integrated modeling."
After
The program would focus on "snowpack measurement and modeling projected water supply."
This is a minor administrative change, updating the reference to the bill's short title.
Before
The report would be submitted "under the Snow Water Supply Forecasting Program Reauthorization Act of 2025."
After
The report would be submitted "under the Snow Water Supply Forecasting Program Reauthorization Act of 2026."
This is a structural change to accommodate a new reporting requirement, shifting the numbering of subsequent paragraphs.
Before
Paragraph (2) was redesignated as paragraph (3).
After
Paragraph (2) was redesignated as paragraph (4).
This adds a crucial accountability and evaluation mechanism, requiring the program to demonstrate the effectiveness of new technologies and models by comparing their forecasts to existing, authoritative benchmarks.
Before
The report would include a list of basins (1) and an assessment of technologies (2).
After
The report would include a list of basins (1), an assessment of technologies (2), and an assessment of forecasts generated using new technologies compared against water supply forecast benchmarks from the Department of Agriculture and NOAA (3).
This significantly reduces the potential funding available for the program, which could impact the scale and pace of its activities, including the development and deployment of new technologies and models.
Before
Authorized $6,500,000 for each of fiscal years 2027 through 2031.
After
Authorized $3,000,000 for each of fiscal years 2027 through 2031.
Scope
Meaningful expansion or narrowing — Changes are scattered throughout Section 2 of the bill, which amends various subsections of the Snow Water Supply Forecasting Program Authorization Act. — V2 represents a refinement and expansion of the program's technological and methodological policy direction, emphasizing broader forecasting methods and evaluation, while simultaneously introducing a significant narrowing of authorized funding. — The changes primarily modify the specific provisions of the Snow Water Supply Forecasting Program Authorization Act (43 U.S.C. 1477) as proposed to be amended by v1, rather than interacting broadly with other existing statutory provisions. The reduction in funding could indirectly impact the scale of activities across all aspects of the program.
Impact analysis
The Snow Water Supply Forecasting Program
Procedural and directional change, with an expanded scope of work and new evaluation criteria.
The program's mandate is expanded to explicitly include exploring new statistical, machine learning, or physical models for improved water supply forecasts, and its reporting requirements now include comparing new forecasts against benchmarks.
Agencies involved in snowpack measurement and water supply forecasting (e.g., Department of Agriculture, NOAA)
Procedural clarification and increased relevance of their existing benchmarks.
Their role in collaboration is clarified to include "models" in addition to "technologies for snowpack measurement." Their benchmarks will be used for comparison in new reporting requirements.
Water managers and reservoir operators
Gain of potentially more accurate and timely information.
The program's enhanced focus on "more accurate, timely, and cost-effective snow monitoring technologies and water supply forecasting" aims to provide them with improved data and analytical methods.
Recipients of authorized appropriations for the program
Loss of potential financial resources for program activities.
The authorized annual funding for fiscal years 2027 through 2031 is reduced from $6,500,000 to $3,000,000.