A severe weather threat comes in from the west late Sunday night and moves across North Texas overnight before another round of severe weather is expected Monday afternoon. A severe thunderstorm watch is issued for North Texas until 5 a.

The highest tornado threat is centered in North Texas along the Red River, particularly near Sherman and Paris, though isolated tornadoes remain possible in DFW, according to the National Weather ...

The metro area, as well as counties to the north and northeast, will face the greatest likelihood of severe weather threats developing.

The ominous weather comes as a record-breaking number of Americans were predicted to travel over the holiday weekend.

We will be watching strong storms developing across North Texas through the late afternoon hours. These late afternoon and early afternoon storms will have the best chance for producing severe weather, and that is why parts of North Texas have been placed under a Level 3 ENHANCED Risk for severe weather.

The National Weather Service said, based on preliminary information, the tornado that slammed into St. Louis was at least an EF-3, with winds of up to 140 mph.

By Tuesday, more than four million will be under the highest risk of severe storms and tornadoes across central and eastern Oklahoma and into the Ozarks. Officials are warning of "significant multi-hazard severe weather including tornadoes - some potentially strong to intense - very large hail and severe winds".