Extreme hail rips through Texas Walmart roof in video [VIDEO]

Extreme hail has ripped through the solid roof of Walmart shop in North Texas, video shows.

Footage posted online shows the moment hail breaks through the store's ceiling, with one person shouting: "Oh my God."

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Other customers can be seen moving calmly with their shopping to get out of the building.

Texas has been plagued by extreme weather this spring. Extreme weather caused at least seven deaths in the state over the past three days, including those of a two-year-old and a five-year-old, Governor Greg Abbott said on Sunday.

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These seven are part of at least 21 people across four states who died during extreme weather over the past weekend.

At least eight died in Arkansas, four in Kentucky and two in Oklahoma, emergency authorities said.

Abbott said 100 Texans were injured in the storms and reported tornadoes, with dozens of buildings damaged.

Just a few days ago, the governor extended a disaster declaration, bringing the total number of counties covered by it to 108.

On Monday, Kentucky Governor Andy Beshear declared a state of emergency "to ensure the communities impacted have the resources they need to respond".

Kentucky officials said the storms, which hit almost the entire state, damaged 100 highways and roads.

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Arkansas Governor Sarah Huckabee Sanders told how in her state, one of the people who died was a person who needed oxygen because they suffered from chronic obstructive pulmonary disease. They reportedly died after the power went out.

There are still at least 40,000 homes and businesses without power in Arkansas, according to the most recent update on poweroutage.us.

Meanwhile, there are 18,800 without power in Texas, 22,400 without power in Missouri, 82,800 without power in Kentucky and 22,000 without power in West Virginia.

Tuesday may not bring the respite many folks will be desperate for, with the National Weather Service (NWS) predicting "numerous strong to severe thunderstorms and areas of flash flooding across portions of northern and central Texas today".

Severe thunderstorm warnings expire in the early hours of the morning, while a flash flood warning is in place for Southeastern Wichita County until 6:00 a.m. CDT.

Forecasters reported Wichita Falls should expect to see flash flooding and advised people: "Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles."

Heat advisories are also still in place for parts of South Texas with the NWS telling folks to expect "sweltering heat" after large swathes of the state were under "urgent" watches for intense heat on Monday.

It all comes before hurricane season is set to officially hit the U.S. on June 1, with experts warning that "this year stands on its own."

The Colorado State University (CSU) Tropical Weather and Climate Research Team, led by Philip Klotzbach, has already released its own forecast, predicting 23 named storms, 11 hurricanes and five major hurricanes—storms of category three or higher intensity.

Team member Alex DesRosiers, whose research specializes in hurricane intensity change, previously told Newsweek: "This year is pretty cut and dry that we have a concerning problem on our hands.

"If you are one of the people who live in a hurricane-prone place that counts on the storm never hitting you, and you've been lucky up to this point and thankfully haven't had to use one, that is great and I am very happy for you.

"But with a year as active as what we're expecting, let this be the year that you break the habit—get a plan in place, know where you need to evacuate. Make sure that loved ones who live in hurricane-prone areas are aware that we are expecting a big year.

"If a hurricane does hit your area, you should pay attention to the forecast of the National Hurricane Center and pay attention to your local emergency managers, whose entire job is to keep you safe and informed in situations that can otherwise be scary."