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Storms to renew flash flood threat over central US this week

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A pair of storms will renew the threat for flash flooding and isolated severe weather over parts of the central United States into this weekend.

The smaller of the two storms will affect parts of the northern and central Plains to part of the Upper Midwest into Wednesday night.

The risk of flash flooding and locally damaging winds will extended from near the South Dakota/Minnesota border to much of Iowa, southern Wisconsin and northern Illinois through Wednesday night. A few of the storms can also produce hail.

"Repeating thunderstorms, known as training, will result in an elevated flash flooding threat from southern Minnesota to west-central Wisconsin," AccuWeather Lead Storm Warning Meteorologist Eddie Walker said.

Part of this area could to receive 6 inches of rain or more through the middle of the week. The flooding risk through Wednesday includes Minneapolis and Rochester, Minnesota, and Eau Claire, Wisconsin.

People should expect travel delays. Motorists should to slow down to reduce the chance of hydroplaning.

Rainfall of this nature has could cause water to pond on area roadways and bring small streams out of their banks, damaging some secondary roads due to runoff.

By Wednesday night, the threat for flash flooding and locally damaging winds will expand to parts of eastern Nebraska, northern Missouri and northeastern Kansas. The threat area during this time includes the cities of Omaha, Nebraska, Kansas City, Missouri, and Des Moines, Iowa.

Late in the week, a large storm forecast to bring heavy rain, high country snow and high winds to the Intermountain West will begin to drift toward the Plains.

The amount of rain and intensity of the severe storms will depend on the speed and intensity of the system.

During this weekend, if the storm from the West stalls, the risk of flooding will increase substantially and could be widespread. However, if the storm system moves along steadily, flooding problems will be more isolated.

There is the potential for repeating showers and thunderstorms, which can bring needed rain to some locations and too much rain and the risk of flooding to others.

A general 1-2 inches of rain is likely from central and western Texas to the Dakotas this weekend. However, locally 3-6 inches of could fall, depending on where downpours repeat.

Portions of Kansas, Nebraska, Minnesota, Wisconsin and South Dakota have received two to six times their normal rainfall for September. The Wichita, Kansas, area has received 8-12 inches of rain during the first three weeks of September, compared to a normal of around 2 inches for the period.

The risk of heavy rain and locally severe storms includes the Dallas and Oklahoma City areas this weekend.