OKLAHOMA CITY – Tens of millions of people in the central U.S. from Texas to the Midwest will be on alert for severe weather through the start of the workweek as cleanup efforts continue in the Oklahoma City metro after tornadoes left widespread damage and injuries across the region.Over the weekend, at least 11 people were injured in Oklahoma City, and numerous homes and businesses suffered major damage from the tornadoes. Crews are still working to clear debris from roadways and restore power, while a new tornado threat unfolded on Sunday. So far, the NWS said damage consistent with an EF-2 tornado has been found in Valley Brook, Oklahoma, and damage consistent with an EF-3 tornado was found in Harrah, Oklahoma.HOW TO WATCH FOX WEATHERForecasters say they believe at least seven tornadoes touched down in the region, but that number could rise to 12 or 13.Damaging winds and large hail have already pounded the region, with 80-mph wind gusts being reported in Checotah and Adair in Oklahoma during the severe weather late Saturday night and early Sunday morning.The next round of thunderstorms started erupting Sunday afternoon, and multiple Tornado Warnings were issued for Oklahoma into the evening hours.A Tornado Watch was in effect for western Arkansas and eastern Oklahoma, including Ada, through 1 a.m. CT.The Oklahoma City area has already been hard hit by severe weather, and the threat continued throughout Sunday and into Monday, the start of the new workweek.DOWNLOAD THE FREE FOX WEATHER APPMore than 34 million people from Texas to the Midwest will need to keep an eye on the sky on Monday as the threat of severe weather grows to cover a larger area of the central U.S.Powerful storms are possible in cities like Dallas and Houston in Texas, as well as Oklahoma City and Tulsa in Oklahoma and St. Louis and Kansas City in Missouri.TORNADOES HIT LARGE CITIES: THIS IS WHYNOAA’s Storm Prediction Center has placed nearly 2 million people from East Texas through eastern Oklahoma, western Arkansas and southwestern Missouri in a Level 3 out of 5 risk for severe weather.Thunderstorms that develop on Monday will be capable of producing tornadoes, large hail and damaging wind gusts.