West Virginians learned a new vocabulary word the hard way.
"Derecho" is the term for the fast, furious storm that ravished the state over the weekend and left a path of devastation in its wake.
Local weather experts are as fascinated by the phenomenon as you might be - if you've had a chance to stop and think about what happened Friday night when the raging storm hit.
"A derecho moves very fast," said Nick Webb, meteorologist with the National Weather Service. "It is widespread with long-lived windstorms."
He compared it to a squall line, a series of severe storms and winds common in the spring.
"Think of it as a squall line on steroids," he said. A derecho "can cover a good chunk of territory in a short amount of time."
"Derecho" is a Spanish word that may be defined as straight.
A simplified explanation is that a line of thunderstorms forms and produces cold air that meets dry air, such as the area had on Friday. This causes the line to move faster and faster as it "feeds on itself," Webb said.
The one that hit the area began in northern Indiana about 2 p.m. Friday and raced through Ohio, West Virginia and Virginia before exiting the coast, he said.
"It covered 1,000 miles with straight line winds moving 60 to 70 mph or more," he said. "Wind gusts at Yeager (Airport) were 77 mph."
Predicting a derecho is tricky.
"Often it forms within 12 hours and really picks up speed," Webb said. "In general, giving more than 24 hours notice is very, very difficult. It's on you before you know it. We had warnings out ahead of time once we knew what it was doing in Ohio."