Violent weather is expected to spread across the Ohio Valley Sunday, the latest system to raise concern in the region after severe thunderstorms swept through the Midwest and South this month.

The National Weather Service said “scattered to numerous” severe storms are forecast from the middle South to the Ohio Valley and Great Lakes. The Ohio and Tennessee valleys will have the largest threat Sunday, according to the weather service.

“There is a notable risk for tornadoes across the Ohio Valley through Sunday night,” said AccuWeather Meteorologist Matt Benz.

The weather service said several dangerous weather conditions are possible in the region, which is under an enhanced risk of thunderstorms. The agency said destructive hail and scattered damaging winds are the primary threats but a few tornadoes are possible.

Numerous tornado warnings and watches were issued Sunday by the weather service in parts of Indiana, Ohio, and Kentucky. A second round of severe storms is also slated to “fire across Southern Indiana and Western Kentucky” Sunday night before moving southeast, the weather service said.

By Sunday night, nearly 749,000 customers across parts of the Midwest and South were without power due to severe weather conditions, according to poweroutage.us

Meanwhile, temperatures are forecast to climb for the rest of the week across the south-central United States, according to AccuWeather.

The heat wave is entering its third week as soaring temperatures impacted the region. Excessive heat warnings and heat advisories were issued for most of Texas.

“The heat that has gripped Texas for days on end will extend into (this) week as an intense core of high pressure high up in the atmosphere expands in coverage from northern Mexico into more of eastern Texas,” said AccuWeather Meteorologist La Troy Thornton.