The National Weather Service Los Angeles‑Oxnard office reported that storms moving into Southern California on Oct. 20, 2026 carry a 30% to 40% chance of thunderstorms. These conditions increase the likelihood of minor flooding, dangerous surf and debris‑flow hazards across Los Angeles and Ventura counties.
The warning cites the incoming storm system as the cause of the elevated risk, noting that the region should expect heightened potential for flooding and debris‑flow events as the thunderstorms develop.