Cooler weather, rain in Northeast; floods in Texas

Storms and severe weather could threaten much of the U.S. in the next few days, meteorologists say.

The culprit is a boundary between two weather fronts, extending from the Southern Plains, through the Mississippi and Ohio river valleys and into the mid-Atlantic states which will bring rain and the potential for thunderstorms to the millions of residents in its path, according to the National Weather Service.

And weather conditions across parts of the Southern Plains are still ripe for fast moving wildfires to develop.

Here's what to know about Tuesday's forecast.

Heavy rains in Texas

A series of upper-level waves are forecast to push east-northeast from Mexico early this week, giving eastern and coastal Texas residents the best chance for heavy rains in the next few days, according to National Weather Service meteorologists.

The persistent bands of energy will bring more than one round of heavy rain in the area and will increase the threat of isolated flash flooding, meteorologists said.