The National Weather Service in Grand Forks issued multiple warnings Saturday as strong thunderstorms with heavy rains caused flooding in northeast North Dakota and northwest Minnesota, and more severe weather is possible yet this weekend.

The weather service issued a flash flood warning Saturday, July 4, for southwestern Kittson and northwestern Marshall counties in Minnesota and southeastern Pembina and eastern Walsh counties in North Dakota. Meanwhile, flood warnings were issued for several northeast North Dakota and northwest MInnesota rivers, the weather service reported.

“Impactful, ” isolated to scattered thunderstorms bringing the risk of hail the size of pingpong balls, wind gusts up to 65 mp and, possibly, a tornado and heavy rains, were possible Saturday, July 4, the National Weather Service in Grand Forks said.

There is potential for another round of similar weather on Sunday afternoon, the weather service said.

Grand Forks, southeastern Pembina and eastern Walsh counties in North Dakota already were under a flash flood warning after heavy thunderstorms dropped 2 to 4 inches of rain over the areas early Saturday morning. The soil in those counties is saturated, and many ditches are nearly full from heavy rains during the past few weeks.

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Meanwhile, the rains also were causing flooding of the Two Rivers near Hallock, and the Red River in Drayton, N.D., and Pembina, N.D., and Oslo, Minn.

The flood warning for the Red River at Oslo is from late Saturday night to the afternoon of Wednesday, July 10, according to the weather service. The river level in Oslo was at 24.5 feet at 9:15 a.m. Saturday., Flood stage is 26 feet. The river is expected to crest at 27.5 feet early the morning of Monday, July 6.

The flood warning for the Red River in Drayton will be from Sunday, July 5, to Friday, July 10. The river level was 25.9 feet at 9:45 a.m. Saturday. Flood stage is 32 feet. The river is expected to rise above flood stage Monday, July 6, morning and crest at 37.5 feet Tuesday, then fall below flood stage Thursday, July 9, the weather service said.

In Pembina, the Red River is expected to flood from Monday, July 5, until Saturday, July 11, the weather service said. The river level at 9:30 a.m., Saturday, July 4, was 30.1 feet. Flood stage is 39 feet. The river is forecast to crest at 41 feet Wednesday evening and fall below flood stage Friday, July 10, the weather service said.

The flood warning for the Two Rivers in Hallock, Minn., is continued until Sunday, July 12. The river was at 804.4 feet Saturday, July 4, 2.4 feet above flood stage. The river is expected to crest at 805.9 feet Tuesday, July 7.

The chance for thunderstorms continues every day until Friday, the weather service reported. Areas such as the Devils Lake basin, central and northern Red River Valley and northwest Minnesota, where rainfall has been excessive, may be susceptible to the risk of flash flooding, the weather service warned.