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Pastimes : Severe weather events, climate change and economics
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From: Ron10/13/2020 11:06:44 PM
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Another Derecho- This Time in New England

Last Wednesday started as a typical fall day in the Northeast, with crisp morning lows and highs set to crest in the 60s. A chance of thunderstorms with isolated gusty winds was in the forecast.

By Wednesday night, nearly 400,000 customers across the Northeast would be without power, with a damaging derecho felling thousands of trees and claiming two lives. The fatalities, in Clifton Park, N.Y., and Great Barrington, Mass., occurred when trees collapsed on vehicles.

What is a derecho?

A derecho is a fast-moving complex of thunderstorms with severe wind gusts that travels an extended distance that can span multiple states. The National Weather Service says a line of thunderstorms must persist for at least 240 miles to be classified as a derecho; the American Meteorological Society lists that threshold at 400 miles.

The National Weather Service confirmed Monday that last week’s storm complex satisfied its derecho criteria.

The most recent previous derecho to affect New England occurred on May 15, 2018, when a spattering of tornadoes swept across western Connecticut. Just this past June, a violent derecho tore across eastern Pennsylvania, claiming three lives.

2020's most devastating derecho struck Iowa in August, where winds up to 140 mph caused hurricane-like destruction in Cedar Rapids and nearby communities, with damage estimated at $7.5 billion.

washingtonpost.com
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