California bills · 2025-2026 Regular Session
California SB 599
Atmospheric rivers: research: forecasting methods: experimental tools.
- Introduced
- In committee
- Passed Senate
- Passed House
- To Governor
- Became law
Sponsors
- Caballero (Democratic)
Summary
Official abstract published by the California legislature· summary
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.
Text versions
- 09/27/26 - Chaptered· Sep 27, 2026
- 08/20/26 - Enrolled· Aug 20, 2026
- 04/24/25 - Amended Senate· Apr 24, 2025
- 03/24/25 - Amended Senate· Mar 24, 2025
- 02/20/25 - Introduced· Feb 20, 2025
- SB599
Roll-call votes
State vote data last updated Oct 15, 2026, 8:06 AM.
| Date | Vote | Result | Your legislators |
|---|---|---|---|
| Aug 19, 2026 House | SB 599 Caballero Senate Third Reading By Ward | pass | Set your home in California to see |
| Aug 29, 2025 House | Do pass. | pass | Set your home in California to see |
| Jul 1, 2025 House | Do pass and be re-referred to the Committee on [Appropriations] with recommendation: To Consent Calendar | pass | Set your home in California to see |
| May 29, 2025 Senate | Special Consent | pass | Set your home in California to see |
| May 23, 2025 Senate | Do pass | pass | Set your home in California to see |
| May 5, 2025 Senate | Placed on suspense file | pass | Set your home in California to see |
| Apr 22, 2025 Senate | Do pass as amended, but first amend, and re-refer to the Committee on [Appropriations] with the recommendation: To Consent Calendar | pass | Set your home in California to see |
Actions
- Sep 27, 2026 · Legislature
Chaptered by Secretary of State. Chapter 650, Statutes of 2026. - Sep 27, 2026 · Legislature
Approved by the Governor. - Aug 27, 2026 · Legislature
Enrolled and presented to the Governor at 4:30 p.m. - Aug 19, 2026 · Senate
(Corrected August 21). - Aug 19, 2026 · Senate
In Senate. Ordered to engrossing and enrolling. - Aug 19, 2026 · House
Read third time. Passed. (Ayes 78. Noes 0. Page 6261.) Ordered to the Senate. - Aug 4, 2026 · House
Ordered to third reading. - Aug 4, 2026 · House
From inactive file. - Aug 3, 2026 · House
Notice of intention to remove from inactive file given by Assembly Member Aguiar-Curry. - Sep 10, 2025 · House
Ordered to inactive file on request of Assembly Member Aguiar-Curry. - Sep 2, 2025 · House
Read second time. Ordered to third reading. - Aug 29, 2025 · House
From committee: Do pass. (Ayes 15. Noes 0.) (August 29). - Jul 16, 2025 · House
July 16 set for first hearing. Placed on APPR. suspense file. - Jul 1, 2025 · House
From committee: Do pass and re-refer to Com. on APPR. with recommendation: To consent calendar. (Ayes 12. Noes 0.) (July 1). Re-referred to Com. on APPR. - Jun 5, 2025 · House
Referred to Com. on W. P., & W. - May 29, 2025 · House
In Assembly. Read first time. Held at Desk. - May 29, 2025 · Senate
Read third time. Passed. (Ayes 38. Noes 0. Page 1328.) Ordered to the Assembly. - May 27, 2025 · Senate
Ordered to special consent calendar. - May 23, 2025 · Senate
Read second time. Ordered to third reading. - May 23, 2025 · Senate
From committee: Do pass. (Ayes 6. Noes 0. Page 1206.) (May 23). - May 16, 2025 · Senate
Set for hearing May 23. - May 5, 2025 · Senate
May 5 hearing: Placed on APPR. suspense file. - Apr 29, 2025 · Senate
Set for hearing May 5. - Apr 24, 2025 · Senate
Read second time and amended. Re-referred to Com. on APPR. - Apr 23, 2025 · Senate
From committee: Do pass as amended and re-refer to Com. on APPR. with recommendation: To consent calendar. (Ayes 6. Noes 0. Page 839.) (April 22). - Apr 4, 2025 · Senate
Set for hearing April 22. - Apr 2, 2025 · Senate
Re-referred to Com. on N.R. & W. - Mar 24, 2025 · Senate
From committee with author's amendments. Read second time and amended. Re-referred to Com. on RLS. - Mar 5, 2025 · Senate
Referred to Com. on RLS. - Feb 21, 2025 · Senate
From printer. May be acted upon on or after March 23. - Feb 20, 2025 · Senate
Introduced. Read first time. To Com. on RLS. for assignment. To print.