Subchapter I. United States Weather Research and Forecasting Improvement 15 U.S. Code §8511. Public safety priority 15 U.S. Code §8512. Weather research and forecasting innovation 15 U.S. Code §8513. Tornado warning improvement and extension program 15 U.S. Code §8514. Hurricane forecast improvement program 15 U.S. Code §8515. Weather research and development planning 15 U.S. Code §8516. Observing system planning 15 U.S. Code §8517. Observing System Simulation Experiments 15 U.S. Code §8518. Computing resource efficiency improvement and annual report 15 U.S. Code §8519. Authorization of appropriations 15 U.S. Code §8520. United States Weather Research Program 15 U.S. Code §8521. Weather and climate information in agriculture