; and (3) by amending subsection (f) to read as follows: (f) Modeling update The Under Secretary, in partnership with National Integrated Drought Information System and the Climate Prediction Center of the National Weather Service, shall undertake an effort to transition existing drought products to probabilistic forecasts and incorporate new and improved dynamical and statistical forecast modeling tools. . (b) Authorization of appropriations Section 4 of the National Integrated Drought Information System Act of 2006 ( 15 U.S.C. 313d note) is amended to read as follows: 4. Authorization of appropriations From amounts made available to Operations, Research, and Facilities of the National Oceanic and Atmospheric Administration, there are authorized to be appropriated to carry out this section the following: (1) $15,000,000 for fiscal year 2024. (2) $15,500,000 for fiscal year 2025. (3) $16,000,000 for fiscal year 2026. (4) $16,500,000 for fiscal year 2027. (5) $17,000,000 for fiscal year 2028. . 503. National Mesonet Program (a) Program The Under Secretary shall maintain the National Mesonet Program (in this section referred to as the Program ). The Program shall— (1) obtain observations in all geographic environments to improve understanding of and forecast capabilities for atmospheric and water events, with a prioritization on leveraging available commercial, academic, and other non-Federal environmental data to enhance coordination across the private, public, and academic sectors of the United States weather enterprise