SB 599CaliforniaProcess complete

Atmospheric rivers: research: forecasting methods: experimental tools.

What it does

Official 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.

More detail

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.

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More on this bill

Where it stands

IntroducedFeb 20, 2025
Passed SenateMay 29
Passed AssemblyAug 19, 2026
To GovernorAug 27
Became LawSep 27

Looking ahead

No hearings or votes scheduled.

History

2026
1. Sep 27Chaptered by Secretary of State. Chapter 650, Statutes of 2026.Latest
2. Sep 27Approved by the Governor Gavin Newsom.Became Law
3. Aug 27Enrolled and presented to the Governor at 4:30 p.m.To Governor
4. Aug 19(Corrected August 21).
  - Vote recorded SB 599 Caballero Senate Third Reading By Ward. Result: pass.Lower
5. Aug 19In Senate. Ordered to engrossing and enrolling.Minor
6. Aug 19Read third time. Passed. (Ayes 78. Noes 0. Page 6261.) Ordered to the Senate.Passed Assembly
7. Aug 4Ordered to third reading.Minor
8. Aug 4From inactive file.
9. Aug 3Notice of intention to remove from inactive file given by Assembly Member Aguiar-Curry.
2025
1. Sep 10Ordered to inactive file on request of Assembly Member Aguiar-Curry.
2. Sep 2Read second time. Ordered to third reading.Minor
3. Aug 29From committee: Do pass. (Ayes 15. Noes 0.) (August 29).Minor
  - Vote recorded Do pass. Result: pass.Lower
4. Jul 16July 16 set for first hearing. Placed on APPR. suspense file.
5. Jul 1From 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.Minor
  - Vote recorded Do pass and be re-referred to the Committee on [Appropriations] with recommendation: To Consent Calendar. Result: pass.Lower
6. Jun 5Referred to Com. on W. P., & W.Minor
7. May 29In Assembly. Read first time. Held at Desk.Minor
  - Vote recorded Special Consent. Result: pass.Upper
8. May 29Read third time. Passed. (Ayes 38. Noes 0. Page 1328.) Ordered to the Assembly.Passed Senate
9. May 27Ordered to special consent calendar.
10. May 23Read second time. Ordered to third reading.Minor
  - Vote recorded Do pass. Result: pass.Upper
11. May 23From committee: Do pass. (Ayes 6. Noes 0. Page 1206.) (May 23).Minor
12. May 16Set for hearing May 23.
13. May 5May 5 hearing: Placed on APPR. suspense file.
  - Vote recorded Placed on suspense file. Result: pass.Upper
14. Apr 29Set for hearing May 5.
15. Apr 24Read second time and amended. Re-referred to Com. on APPR.Major
16. Apr 23From 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).Major
17. Apr 22
  - Vote recorded Do pass as amended, but first amend, and re-refer to the Committee on [Appropriations] with the recommendation: To Consent Calendar. Result: pass.Upper
18. Apr 4Set for hearing April 22.
19. Apr 2Re-referred to Com. on N.R. & W.Minor
20. Mar 24From committee with author's amendments. Read second time and amended. Re-referred to Com. on RLS.Major
21. Mar 5Referred to Com. on RLS.Minor
22. Feb 21From printer. May be acted upon on or after March 23.
23. Feb 20Introduced. Read first time. To Com. on RLS. for assignment. To print.Introduced

Issue with this bill?

SB 599CaliforniaProcess complete

Atmospheric rivers: research: forecasting methods: experimental tools.

What it does

Official summary

More detail

Where do you stand?

Tell your reps

Take a position to see your representatives and ways to contact them.

More on this bill

Where it stands

IntroducedFeb 20, 2025
Passed SenateMay 29
Passed AssemblyAug 19, 2026
To GovernorAug 27
Became LawSep 27

Looking ahead

No hearings or votes scheduled.

History

2026
1. Sep 27Chaptered by Secretary of State. Chapter 650, Statutes of 2026.Latest
2. Sep 27Approved by the Governor Gavin Newsom.Became Law
3. Aug 27Enrolled and presented to the Governor at 4:30 p.m.To Governor
4. Aug 19(Corrected August 21).
  - Vote recorded SB 599 Caballero Senate Third Reading By Ward. Result: pass.Lower
5. Aug 19In Senate. Ordered to engrossing and enrolling.Minor
6. Aug 19Read third time. Passed. (Ayes 78. Noes 0. Page 6261.) Ordered to the Senate.Passed Assembly
7. Aug 4Ordered to third reading.Minor
8. Aug 4From inactive file.
9. Aug 3Notice of intention to remove from inactive file given by Assembly Member Aguiar-Curry.
2025
1. Sep 10Ordered to inactive file on request of Assembly Member Aguiar-Curry.
2. Sep 2Read second time. Ordered to third reading.Minor
3. Aug 29From committee: Do pass. (Ayes 15. Noes 0.) (August 29).Minor
  - Vote recorded Do pass. Result: pass.Lower
4. Jul 16July 16 set for first hearing. Placed on APPR. suspense file.
5. Jul 1From 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.Minor
  - Vote recorded Do pass and be re-referred to the Committee on [Appropriations] with recommendation: To Consent Calendar. Result: pass.Lower
6. Jun 5Referred to Com. on W. P., & W.Minor
7. May 29In Assembly. Read first time. Held at Desk.Minor
  - Vote recorded Special Consent. Result: pass.Upper
8. May 29Read third time. Passed. (Ayes 38. Noes 0. Page 1328.) Ordered to the Assembly.Passed Senate
9. May 27Ordered to special consent calendar.
10. May 23Read second time. Ordered to third reading.Minor
  - Vote recorded Do pass. Result: pass.Upper
11. May 23From committee: Do pass. (Ayes 6. Noes 0. Page 1206.) (May 23).Minor
12. May 16Set for hearing May 23.
13. May 5May 5 hearing: Placed on APPR. suspense file.
  - Vote recorded Placed on suspense file. Result: pass.Upper
14. Apr 29Set for hearing May 5.
15. Apr 24Read second time and amended. Re-referred to Com. on APPR.Major
16. Apr 23From 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).Major
17. Apr 22
  - Vote recorded Do pass as amended, but first amend, and re-refer to the Committee on [Appropriations] with the recommendation: To Consent Calendar. Result: pass.Upper
18. Apr 4Set for hearing April 22.
19. Apr 2Re-referred to Com. on N.R. & W.Minor
20. Mar 24From committee with author's amendments. Read second time and amended. Re-referred to Com. on RLS.Major
21. Mar 5Referred to Com. on RLS.Minor
22. Feb 21From printer. May be acted upon on or after March 23.
23. Feb 20Introduced. Read first time. To Com. on RLS. for assignment. To print.Introduced

Issue with this bill?

What it does

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More on this bill

Where it stands

Looking ahead

History

What it does

Where do you stand?

Choose your position

Tell your reps

More on this bill

Where it stands

Looking ahead

History