Atmospheric rivers: research: forecasting methods: experimental tools.

Legislative status

1. Introduced
2. In Committee
3. Reported by Committee
4. Floor Vote Scheduled
5. Passed One Chamber
6. Passed Both Chambers
7. Sent to Executive
8. Enacted

Summary

SB 599 amends the Water Code to mandate that the DWR incorporate new experimental forecasting methods that predict atmospheric rivers weeks to months ahead. The change applies to the department’s AR/FIRO research program and to any agencies that use its forecasts. It aims to improve flood protection, reservoir management, and water‑supply planning in a changing climate.

AI-generated summary — may be incomplete or inaccurate. Verify against the official bill text.

Vote

Read third time. Passed. (Ayes 78. Noes 0. Page 6261.) Ordered to the Senate. · Aug 19, 2026

Hearings

• Appropriations Committee Hearing
  Appropriations · Aug 29, 2025
• Appropriations Committee Hearing
  Appropriations · Jul 16, 2025
• Water, Parks, and Wildlife Committee Hearing
  Water, Parks, and Wildlife · Jul 1, 2025
• Appropriations Committee Hearing
  Appropriations · May 23, 2025
• Appropriations Committee Hearing
  Appropriations · May 5, 2025

History

1. Sep 10, 2025Ordered to inactive file on request of Assembly Member Aguiar-Curry.
2. Sep 2, 2025Read second time. Ordered to third reading.
3. Aug 29, 2025From committee: Do pass. (Ayes 15. Noes 0.) (August 29).
4. Jul 16, 2025July 16 set for first hearing. Placed on APPR. suspense file.
5. Jul 1, 2025From 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.
6. Jun 5, 2025Referred to Com. on W. P., & W.
7. May 29, 2025Read third time. Passed. (Ayes 38. Noes 0. Page 1328.) Ordered to the Assembly.
8. May 29, 2025In Assembly. Read first time. Held at Desk.
9. May 27, 2025Ordered to special consent calendar.
10. May 23, 2025Read second time. Ordered to third reading.
11. May 23, 2025From committee: Do pass. (Ayes 6. Noes 0. Page 1206.) (May 23).
12. May 16, 2025Set for hearing May 23.

The 12 most recent of 22 recorded actions.

Sponsors

• Anna Caballero (D) · sponsor
• Caballero

Bill text

Opens the legislature’s own copy.

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