It was about a year ago a quick moving storm ripped through the Mid-Atlantic, catching most weather experts by surprise and leaving some without power for weeks.
It was called a “derecho”, and he’s BACK. Let’s have a quick refresher on derechos, shall we?
A storm system brewing in the Midwest holds the potential to recreate the fierce derecho winds that whipped through Maryland last year. Why? Because they’re forming in a long straight line, which fuels the winds that give the nasty storms their name. (Derecho is Spanish for “straight” or “direct”).
“This is a particularly dangerous situation,” the National Weather Service said in an alert.
However, Tom Moore, a Weather Channel meteorologist, suggested that the storms Wednesday would not match last year’s “because it’s a much sloppier system.” But he said it would still bring widespread damage and localized flooding.
To qualify as a derecho, wind gusts throughout the storm must be at least 58 mph (93 kph), but particularly strong storms have had wind speeds exceeding 100 mph (160 kph). The storm also must cause wind damage across an area at least 240 miles (400 kilometers) wide to count as a derecho.
The systems are known for their “bows” or “bow bands” on radar that indicate the forming of ominous looking arcus clouds, also called a shelf cloud.
Because the derecho storm of June 29, 2012 came around 8pm, it was hard to see those clouds forming, which would have been a tip off.
Particularly strong storms are forecast for late Wednesday night, early Thursday morning in the Central Maryland area.