Atmospheric rivers: research: forecasting methods: experimental tools.

California SB599 aims to improve the state's understanding and forecasting of atmospheric rivers, which are significant weather events that can bring heavy rainfall. The bill proposes to enhance research and develop experimental tools to better predict these events and their impacts on water resources. By focusing on this area, the legislation seeks to help manage water supply and mitigate potential flooding risks.

CA SB599 is a senate bill in the California 2025-2026 Regular Session, sponsored by Anna Caballero (D), currently “Passed” since September 27, 2026.

We track 5,060 California bills this session, 46 of them sponsored by Anna Caballero.

The key recorded vote (A, August 19, 2026) ended 78–0 and passed.

Supporters of SB599 would likely highlight the bill's potential to advance scientific research and improve water management strategies in California. They may emphasize that better forecasting of atmospheric rivers could lead to more effective responses to extreme weather, ultimately protecting communities and enhancing water resource planning.

Critics of SB599 might argue that the bill represents unnecessary government spending on research without guaranteed practical outcomes. They may express concerns that focusing on atmospheric river forecasting could divert attention and resources from other pressing water management issues facing the state.

Source: LegiScan roll call vote data.