Texas will once again be under severe weather watch Wednesday with severe storms forecast over the northern portion of the state. 

 The expected storms in Texas will be part of a trend from the central U.S. throughout the Southeast, with the chance of storms extending from southeast Colorado to Florida.

 More than 7 million people in and around Dallas are under an enhanced severe weather risk, while another 36 million throughout the South have a chance of having turbulent weather. 

 Elsewhere, the Upper Midwest and northern Plains continue to brace for historic river flooding. Here's what to know about the national weather forecast for Wednesday.

 Wednesday will be the second straight day severe thunderstorms will be possible in central and northern Texas, but the National Weather Service said the conditions could worsen have more certainty in the afternoon and evening.

 Isolated tornadoes are also possible, AccuWeather said. "Severe storms producing damaging winds and very large hail are expected," the NWS said. "General expectation is for thunderstorm initiation to occur along the dryline during the early afternoon."

 More than 7 million people are under a "enhanced" risk for severe weather in Texas, meaning numerous thunderstorms are possible, according to the NWS.