flash flood warning was issued for St. Louis and nearby areas on Sunday morning due to heavy rains.

“Flash Flood Warning including Saint Louis MO, Oakville MO, University City MO until 8:45 AM CDT,” tweeted the National Weather Service St. Louis early Sunday.

On its website, the National Weather Service noted that “heavy rain and thunderstorms may produce flooding across the Mid Mississippi Valley and in the St. Louis metro region.”

TROPICAL STORM ISAIAS FLOODING SWEEPS PENNSYLVANIA WOMAN AWAY IN HER CAR

Strong to severe thunderstorms are also expected in the Upper Mississippi Valley, according to the National Weather Service.

File photo - This aerial view shows the Gateway Arch near the Mississippi River in St Louis, Missouri, on October 23, 2019.

File photo - This aerial view shows the Gateway Arch near the Mississippi River in St Louis, Missouri, on October 23, 2019. (Photo by DANIEL SLIM/AFP via Getty Images)

“Strong to severe thunderstorms with damaging winds, large hail, and heavy rain are expected across the Upper Mississippi Valley on Sunday, which includes the Twin Cities metro area,” the National Weather Service explains, on its website.

The National Weather Service Twin Cities tweeted that “an isolated tornado or two is also possible.”

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Last week the deadly Tropical Storm Isaias brought flooding, power outages, and tornadoes to the East Coast.

Fox News’ Alex Hogan contributed to this article.