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Forecasters are warning of a wet and potentially dangerous holiday weekend for already waterlogged Texas, Oklahoma and Arkansas.

The National Weather Service said flooding could last for weeks along the Red River in Arkansas, the Nueces River in Texas near the Mexico border, and the Wichita River in Texas.

Flash-flood watches were posted Friday for parts of North Texas and almost all of Oklahoma.

More rain in Wichita Falls, Texas, on Friday pushed the total for May to 13.3 inches, the most there in any month on record. Fort Smith, Arkansas, has already posted its wettest May on record, 13.8 inches, and Oklahoma City seemed certain to set a similar record.

In Corpus Christi, Texas, 12.6 inches of rain has fallen in May — more than in the entire drought year of 2011, said Nick Wiltgen, a meteorologist for The Weather Channel.

The Weather Channel said the greatest chance of severe weather on Friday night was for West Texas, New Mexico and a sliver of Colorado, with hail and strong winds possible and a limited tornado threat.

On Saturday and Sunday, the rough weather is expected to move east, threatening Kansas, Oklahoma, Missouri, Arkansas and Louisiana. On Monday, Minnesota and Iowa are part of the threat zone.

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— Erin McClam