Millions of people from Texas, Ohio, Tennessee, Nebraska and Oklahoma are bracing for dangerous conditions as forecasters warn of possible tornadoes, 80-mph wind gusts, flooding and hail as the extreme weather outbreak rolls into its sixth week.

About 18 million people are at risk for severe storms Monday night across the Central Plains in areas like North Texas, South Dakota and eastbound into Illinois.

The cities most at risk include Oklahoma City, Tulsa, Wichita, Omaha, Kansas City, Lincoln, Wichita Falls and Des Moines.

The severe storm risk extends to 25 million people across the Midwest, the Ohio Valley and the Tennessee Valley on Tuesday.

Following a week of heavy flooding that included rescue crews pulling hundreds of people to safety, the Southeastern part of Texas is underwater.

In recent days, the weather has been problematic in parts of Texas, including the Houston area, which saw more than 500 rescues and evacuations in a matter of days.

On Monday, Gov. Greg Abbott said severe weather was to blame for at least three Texas deaths: a 5-year-old boy swept away by floodwaters in Johnson County early Sunday; Lt. James “Jimmy” Waller, a Conroe police officer whose home was hit in the April 28 tornado in Trinity County; and a man, not identified who was also swept away by stormwater in Bosque County in recent days. Details for the latter death were unavailable.