The National Weather Service modified a flash flood watch it previously issued for the region, extending the flood threat posed by a lingering pattern of rainy weather until 1 a.m. Thursday.
There’s a 90 percent chance of heavy rain Wednesday, when the high temperature will reach 76. A 60 percent chance of heavy rain is forecast for Wednesday evening and into Thursday and the low will dip to 65.
After the flash flood watch expires Thursday, there’s a 20 percent chance of storms and the high will climb to 80. There’s a 60 percent chance of storms Thursday night.
A slight 20 percent chance of storms is forecast for Friday, when temperatures will reach 90.
The bright side is that the area got a little break from wet weather following a June that smashed previous rainfall records.
“We had a good 72 hours or so of dry weather over the fourth of July weekend that dried up the ground quite a bit,” National Weather Service meteorologist Jayson Gosselin said. “So the soil can take some rain — as long as it doesn’t come in too short of a period of time.”
In June, a total of 13.14 inches of rain fell at Lambert International Airport in St. Louis; the previous record was 12.35 inches. Figures are kept back to the 1870s.
The projected wet weather is expected to keep local rivers from falling back from flood stages.
The Mississippi River crested at the St. Louis riverfront July 2 at 37.49 feet. Moderate flood stage is 35 feet. It dropped to 32.3 feet by Tuesday afternoon. The river is expected to dip under minor flood stage — 30 feet — briefly Thursday. But the forecasted rain is expected to push the Mississippi back to 31.7 feet by Sunday.