I’d never even heard of a derecho until a couple of days ago.
From The Guardian’s ‘Derecho’ phenomenon responsible for violent line of US storms:
Meteorologists said Friday’s onslaught from the heavens was the result of a number of atmospheric factors that combined to create the perfect storm â€“ or a derecho, to give it a more accurate description.
The phenomenon â€“ which derives it name from the Spanish for “straight” â€“ takes the form of a line of warm-weather, fast-moving thunderstorms that roll over the land, usually in the summer months.
The result, as was in evidence this weekend, can be devastating. They are uncommon, but not altogether rare â€“ with Friday’s derecho making its mark mainly because of the number of people affected.
Daniel Porter, meteorologist at the National Weather Service, explained: “A derecho is basically a long-lived, long-lasting line of thunderstorms.
Check out this video and note the sheer distance — about 600 miles — traveled by the Ring of Fire Derecho:
Same video but extended a little bit north: