A Severe Flood Watch is in effect for parts of California, including San Bernardino County-Upper Colorado River Valley, through 29 September 2026, 05:00. The alert was issued by the National Weather Service.

The affected areas also include portions of northwest Arizona and southern Nevada. This type of alert indicates that flooding caused by excessive rainfall is possible.

Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Low-water crossings may be flooded.

In case of an emergency, dial 911. The National Weather Service advises monitoring later forecasts and being alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. Avoid low-lying areas and be ready to move to higher ground if necessary.