A line of violent thunderstorms tore across the most populous corridor of Canada on Saturday, killing at least five people and cutting power to nearly a million people.
, or a thunderstorm complex that produces extremely powerful wind gusts across a wide swath. The effects from a derecho’s violent winds are often comparable to those of hurricanes. Derechos are fairly common in the Lower 48 states but are more rare north of the border and seldom affect such densely populated corridors.
Derechos often strike along the northern periphery of heat domes, where conditions are ripe for powerful thunderstorms. Indeed, very unusual early-season heat swelled over eastern North America on Saturday, with numerous cities in the eastern United States setting records. The combination of this heat with moisture pulled north from the Gulf of Mexico encouraged extreme atmospheric instability, or fuel for thunderstorms, in eastern Canada. The storms erupted as this hot, moist air was met by a strong cold front marching eastward. This was the same cold front that caused temperatures in Denver to plunge by more than 50 degrees in 24 hours and helped spawned the deadly tornado in Gaylord, Mich.
The unusual characteristics of Saturday’s derecho may have been representative of a climate change-related trend in the location of such damaging thunderstorm events. , “The corridors of maximum derecho frequency likely would shift poleward with time” as warm domes of high pressure expand north under global warming.
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