A flood watch will go into effect for much of south Louisiana this week as a slow-moving low-pressure system heads toward the Gulf of Mexico, bringing with it the potential for downpours and flash flooding along the Gulf Coast.

Its chances for tropical development are less, but rainfall flooding is a threat, regardless, in the lower Mississippi Valley. Here's our latest forecast.

The large-scale atmospheric pattern looks to become more conducive for tropical development in early August, but we'll see. In the meantime, another system like this week's disturbance could develop in the northern Gulf or off the Southeast coast,