ST. LOUIS, Mo. (KMOV)--The remnants of Hurricane Isaac will slowly move over Missouri and Illinois this weekend. That slow movement will result in some hefty rainfall totals. The first bands of rain are already in the News 4 viewing area.
The 4Warn Storm Team says the heavier rain will likely hold off in the St. Louis metropolitan area until after the busiest part of the morning rush, but some areas to the south of St. Louis are already experiencing moderate rain. Rain chances will slowly ramp up through the day ahead.
Scattered showers and thunderstorms are expected this afternoon, and an isolated severe storm can’t be ruled out, mainly south of St. Louis.
The heaviest rain of the entire holiday weekend is anticipated tonight into Saturday morning. More periods of rain, some locally heavy, are expected for the rest of the day Saturday. As Isaac’s remnants slowly push east of St. Louis Sunday, rain should taper and come to an end. Labor Day’s forecast is dry.
Total rainfall amounts from today through Sunday will likely range from 3 to 5 inches in most areas, with some isolated higher totals possible. That might lead you to think that flash flooding is a concern this weekend, but 4Warn Meteorologist Matt Chambers says that threat is minimal.
“Given the drought we find ourselves in this summer, local rivers and streams are running very low. Those waterways will be able to handle a lot of rain before flooding would become a widespread concern. Additionally, this rain will fall over a period of 48 hours, maybe more, so the threat of flooding is much lower than it would be if all this rain was expected over a short period of time,” Chambers says. But he adds, “We will have to keep a close eye on the urban flooding potential. In areas where there is more concrete than soil, some rapidly rising water levels are possible.”