After weeks of windy and dry weather, rain has fallen in parched Southern California and is expected to aid firefighters who are mopping up multiple wildfires. But potentially heavy downpours on charred hillsides could bring new troubles such as toxic ash runoff.

With parts of Los Angeles County still smoldering from wildfires, the expected rain this weekend would seem like a welcome relief. But how the rain falls could make the difference between a disaster respite or a disaster repeat.

As President Donald Trump prepares to tour wildfire damage in California, he’s zeroing in on one of his frequent targets for criticism: State water policy.

The president has had harsh words for state and local leaders in California amid the deadly blazes. He recently suggested that federal aid could come with strings.