Oklahomans on Saturday were assessing the damage wrought by dozens of significant fires that swept across the state, fueled by dry vegetation and hurricane-force winds that created dangerous conditions from the Texas Panhandle all the way to Iowa.

Preliminary reports showed that the fires had destroyed at least 20 structures in Oklahoma and that at least four people had died in car crashes in Texas, according to officials there. More than 150 wildfires were burning in the early morning hours of Saturday in Oklahoma alone, according to the Federal Emergency Management Agency.

Fierce winds on Friday grounded aerial firefighting tools, including the “super scooper” planes that can drop thousands of gallons of water onto a blaze. On Saturday, they were preparing to fly, said Keith Merckx, a spokesman for the Oklahoma Forestry Services. It may take days to assess the damage, he added.

Emergency crews in both Oklahoma and Texas were scrambling to keep up with all the blazes popping up across the map.

The largest fire, the 840 Road fire in western Oklahoma near the border with Texas, had burned 95,000 acres as of Saturday morning and was 0 percent contained, according to FEMA.

The service warned that while Saturday’s conditions were better, a red flag warning remained in effect in parts of the Panhandle and western Oklahoma.