LUBBOCK, Texas – Nearly 90 million Americans are under threat of severe weather Friday in an area covering a broad swath of the continental U.S. east of the Rocky Mountains. The FOX Forecast Center expects damaging wind gusts and large hail to be the main hazards for those living in the area covered by the threat – though a few tornadoes can’t be ruled out – as rounds of severe storms are expected to last through the weekend.While the threat of severe storms stretches from West Texas to Maine on Friday, some of the most damaging impacts are expected from the southern Plains through the lower Mississippi and Tennessee valleys.A severe thunderstorm in Arkansas spun up a damaging tornado in Van Buren. Emergency managers reported at least 50 structures sustained damage in a neighborhood.A tornado-warned storm was caught on a traffic camera as it swept through Fort Smith, Arkansas as the line of storms pushed east Friday morning. Thunderstorms in Oklahoma on Friday morning also spun up tornadoes, took down power lines and caused flash flooding ahead of more disturbed weather.WATCH: SUPERCELL CUTS PATH THROUGH 2 STATES, PRODUCING TORNADOES LIVE ON FOX WEATHERAn apparent tornado was spotted by police Friday morning near Vian, Oklahoma as a tornado-warned storm moved through Sequoyah County.The storms were strong enough to rip down trees and close local roads in Luther, Oklahoma, according to the fire department.WATCH: DRONE VIDEO SHOWS GIANT WAVE SWALLOWING UP SWIMMERS ON MEXICAN BEACHThe southern Plains, including the Texas panhandle, Oklahoma and Kansas, are at particular risk of large, egg-sized hail on Friday on the heels of a strong supercell thunderstorm that produced several tornadoes and flash flooding from the New Mexico state line to Lubbock, Texas. Storms are expected to develop daily in the afternoons and evenings, with leftover energy driving some thunderstorm formation in the overnight hours. The threat is expected to gradually move east as the weekend progresses.”It’s like all of this action has been riding the [Interstate]-40 corridor and the I-40 corridor has been the focus of all the action this entire week,” FOX Weather Meteorologist Britta Merwin said.HOW TO WATCH FOX WEATHERNOAA’s Storm Prediction Center has issued a Level 3 out of 5 risk of severe thunderstorms covering two pockets of the southern Plains: an area from southeastern Colorado to southwestern Nebraska and part of the Oklahoma panhandle, and part of the Texas panhandle including Lubbock into parts of eastern New Mexico.Those areas could see large egg-sized hail as storms develop Friday.The largest threat of damaging wind gusts covers those areas in the Southeast, including Kentucky, Tennessee and northern Georgia.Tropical moisture from the Gulf will enhance severe storms through the weekend, meaning that they will be able to produce lots of rain in a short amount of time. Rain rates have the potential to easily exceed 1 inch per hour at times.Storms Friday morning produced enough rain to cause flash flooding in Ada, Oklahoma.A Level 2 out of 4 Flash Flood Threat has been issued for much of Oklahoma on Friday and flood threats will follow the path of severe thunderstorms through the weekend.Although the storms are expected to move at a decent pace, the setup may allow some areas to experience repeated rounds of heavy rain. This “training” effect—where storms repeatedly form over the same locations, could lead to totals exceeding 3 inches, and possibly as high as 5 inches by the time it’s all over.