Forecasters released a breakdown Tuesday of where and when heavy rainfall this week is expected to hit areas of Southern California left burn-scarred by recent wildfires, raising the risk of potentially dangerous debris flows in those parts of the region.

Precipitation was lighter than expected on Wednesday, with another storm on the way Thursday night into Friday.

Snow, wind and the heaviest rain event of the season is expected this week in portions of Southern California prompting a flood watch warning.

Flames burned through brush and vegetation, reducing the soil’s ability to absorb water — allowing water to possibly flow quickly, picking up debris and creating dangerous mudslides, debris flows and flash flooding.

Southern California is preparing for its most powerful winter storm yet after months of dry conditions. This marks the third major storm to hit the region in less than a month, and meteorologists warn that heavy rainfall and strong winds are on the way.