Parts of Southern California could experience heavy rain and thunderstorms due to the increase in moisture from Tropical Storm Mario as it moves over the region. As the storm continues to move, the region will be subject to the threat of flooding and debris flows near recent wildfire burn scars.

The system is "likely to form during the middle to latter part of the week" as the area moves at 10 to 15 mph in a west-northwesterly direction, north of the islands in the northeastern Caribbean, according to the center. If it becomes a tropical storm, the next name up in the 2025 storm name rotation is Gabrielle.