The record temperatures in northern Canada are several degrees above anything else in the history books.
Instigating the extreme warmth is a dramatic northward meandering of the jet stream, or the river of wind in the upper atmosphere that divides heat near the equator from frigid air banked up over the North Pole. That jet stream dip — within which was nestled a pocket of cold air, low pressure and spin at high altitudes — dove south over the West Coast. Then the jet stream surged into Canada, cresting north of a stagnant ridge of high pressure known as a heat dome.
This high brought hot, sinking air that dried out and heated up further, simultaneously deflecting any inclement weather and squashing attempts at cloud cover. And because the jet stream deviatedfar north, warm air was able to slide hundreds of miles north of where it otherwise ordinarily would be. In addition to the nearly 90-degree readings that were logged in northern Canada, a menagerie of records were set in the Lower 48. Among them:Missoula, Mont., hit 90 degrees Monday, not only setting a daily record, but also marking the second-earliest 90-degree reading on recordthe hottest Missoula has been this early in the year since 1910. The city also got to 88 degrees Wednesday, beating the 84-degree record set in 1985.Lake Yellowstone, Wyo.
Edmonton was the hottest of the major cities in Canada, reaching 84.9 degrees. Averages are in the mid-60s. Calgary got to 78.4 degrees, narrowly edging out a record set in 1890.by human-induced climate change, it is accurate to state that episodes of unseasonable heat are made more frequent, probable and intense due to human action. In a world unperturbed by humans, one might expect a roughly equal ratio of hot to cold records.
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