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California · 2025–26 Regular Session · Senate Bill

SB 599: Atmospheric rivers: research: forecasting methods: experimental tools.

Enacted Official data

  1. Introduced
  2. In committee
  3. Passed one chamber
  4. Passed both chambers
  5. Enacted

Last official action: ·Record last updated:

Plain-language summary

SB 599 is a senate bill introduced in the California Senate on February 20, 2025. According to its official title, it concerns: Atmospheric rivers: research: forecasting methods: experimental tools. Primary sponsor: Anna Caballero (D). Most recent recorded action (September 27, 2026): Chaptered by Secretary of State. Chapter 650, Statutes of 2026.

Generated automatically from the official title, sponsor list, and status record only. It does not characterize the bill’s purpose or effects. How summaries are written

Official summary

Legislative Counsel’s Digest (official, as of the latest version). Written by nonpartisan legislative staff; reproduced verbatim.

Existing law establishes the Atmospheric Rivers Research and Forecast Improvement Program: Enabling Climate Adaptation Through Forecast-Informed Reservoir Operations and Hazard Resiliency (AR/FIRO) Program in the Department of Water Resources. Existing law requires the department to operate reservoirs in a manner that improves flood protection, and to reoperate flood control and water storage facilities to capture water generated by atmospheric rivers. Existing law requires the department to research, develop, and implement new observations, prediction models, novel forecasting methods, and tailored decision support systems to improve predictions of atmospheric rivers and their impacts on water supply, flooding, post-wildfire debris flows, and environmental conditions.

This bill would, for novel forecasting methods researched, developed, and implemented by the department, require the department to include the use of experimental tools that produce seasonal and subseasonal atmospheric river forecasts, as defined.

Sponsors

Sponsors by party (alphabetical): Democratic 1

NameRolePartyChamberDistrict
Anna CaballeroPrimary sponsorDemocraticSenate14

“Support” is shown only as formal sponsorship recorded by the legislature. Roll-call votes are available on the official bill page.

Recent official actions

  1. Chaptered by Secretary of State. Chapter 650, Statutes of 2026.
  2. Approved by the Governor.
  3. Enrolled and presented to the Governor at 4:30 p.m.
  4. (Corrected August 21).
  5. In Senate. Ordered to engrossing and enrolling.
  6. Read third time. Passed. (Ayes 78. Noes 0. Page 6261.) Ordered to the Senate.
  7. Ordered to third reading.
  8. From inactive file.
  9. Notice of intention to remove from inactive file given by Assembly Member Aguiar-Curry.
  10. Ordered to inactive file on request of Assembly Member Aguiar-Curry.
  11. Read second time. Ordered to third reading.
  12. From committee: Do pass. (Ayes 15. Noes 0.) (August 29).

Sources

  1. California Legislative Information — pubinfo database export
  2. Official bill page