ATLANTA – A line of severe thunderstorms caused damage across the Southeast on Monday as another round of severe storms threatened some 86 million people across the eastern U.S. with damaging winds and a few tornadoes.While the tornado threat is greatest from southeastern Louisiana through the Carolinas, the threat of damaging winds extends northward to Pennsylvania, New Jersey, the New York City metro area and parts of upstate New York.Early-morning storms ripped the roof off and damaged parts of the Floyd County Schools Central Office in Kentucky.These storms are associated with the same system that pummeled the central part of the country Sunday, leaving at least two people dead in Indiana. The National Weather Service confirmed that an EF-1 tornado hit Fairdale, Kentucky, on Sunday evening. Tornadoes were spotted in several other states, and the NWS received dozens of wind and hail reports.HOW ARE TORNADOES RATED? THE ENHANCED FUJITA SCALE EXPLAINEDSeveral tornado-warned storms moved through Louisiana on Monday morning and delayed school openings in Tangipahoa Parish and surrounding areas.Dothan, Alabama police and fire departments responded to Dothan Preparatory School on Monday afternoon after a tornado-warned storm moved through the area, causing damage and injuries at the school. TORNADO-WARNED STORM LEADS TO INJURIES AT ALABAMA SCHOOL, POLICE SAY”Students are safe at Dothan Prep,” Dothan police said. “Injuries are being addressed by Dothan Fire. Please wait to get children due to debris in the roads.”As the strong cold front driving the severe storms charged eastward on Monday, millions of people from the Northeast southwestward to the central Gulf Coast region face the threat of severe weather to kick off the new workweek.NOAA’s Storm Prediction Center (SPC) issued Severe Thunderstorm Watches for parts of several states as the major storm system barreled across the region Monday.WATCH VS. WARNING: HERE ARE THE DIFFERENCES BETWEEN THESE WEATHER TERMS THAT COULD SAVE YOUR LIFEOn Monday, as the storm moved east, power outages are rising in central Georgia, with nearly 30,000 without service. Due to the thunderstorms, the FAA issued a ground stop for Atlanta International Airport. According to FlightAware.com, over 40% of flights at Hartsfield-Jackson Intl Airport were been delayed and 50 flights were canceled. Atlanta leads the country in top travel disruptions, with Orlando and Charlotte also facing delays from the weather. Video from FOX Weather Storm Specialist Mike Seidel shows heavy rain pounding in Marietta, Georgia, where a Severe Thunderstorm Watch was in place through Monday afternoon. Strong to severe thunderstorms packing threats of damaging wind gusts and a few tornadoes are expected Monday from portions of the Northeast southwestward to the central Gulf Coast region, threatening both the morning and evening commutes.The SPC has posted a Level 2 out of 5 severe weather risk that stretches from the lower Hudson Valley of New York to southeastern Louisiana. However, a Level 3 out of 5 severe weather risk covers much of the Southeast, from central North Carolina to Georgia. This includes the Atlanta area in Georgia and Raleigh, Charlotte and Durham in North Carolina. Storms are ongoing near the Gulf Coast and parts of the Southeast, with additional development expected farther north throughout the day, according to the FOX Forecast Center. While the atmosphere will only be modestly unstable in the Northeast, storms in this region could still produce strong winds.The severe weather threat will continue into Monday evening before the storms weaken as they move offshore.TORNADO SAFETY: HOW TO IDENTIFY THE SAFEST PLACES INSIDE YOUR HOMEWhile the highest concentration of wind damage is forecast to be centered over parts of the Carolinas, Georgia, Alabama, southern Mississippi, southeastern Louisiana and the Florida Panhandle, a notable threat extends up much of the East Coast, including major cities along the Interstate 95 corridor such as Washington, Baltimore, Philadelphia and New York City.Damaging winds could take down trees and power lines, potentially causing widespread power outages in some areas.DOWNLOAD THE FREE FOX WEATHER APP