More than 20 million Americans in eight states were under red flag warnings Tuesday morning as ... dry conditions are producing "critical to extreme" fire danger in Oklahoma and North Texas. A sign in ...

When the weather pattern is particularly windy and dry, it triggers the warning. The criteria for a Red Flag warning differs across the country based on the local climate. For instance ...

Warm, dry and windy conditions have combined to make for critical fire weather danger across Iowa. A red flag warning is ...