A powerful storm with an atmospheric river threatens to bring life-threatening flooding and debris flow from Los Angeles wildfires burn scars. The atmospheric river is forecast to unleash heavy downpours and wind on areas charred by last month’s fires,

The Alameda County Local Hazard Map Alameda County’s hazard map shows potential flood zones in the event of a 100-year and 500-year storm. A 500-year storm has a 0.2% chance of occurring in a given year, but climate change means they’re happening more and more frequently.

Ahead of the storm’s arrival, officials in Southern California distributed sandbags, prepositioned rescue swimmers and told residents to have go-bags ready.