The peak of typical Canadian wildfire season still lies ahead.
While the west saw what is destined to be a painfully brief respite, a heat dome of high pressure flexed over the country’s kindling to the east. Under that heat dome, the only weather other than hot and dry is the occasional thunderstorm that tends to deliver more lightning than rain, potentially sparking new fires.
As seen with recent smoke invasions in the Northeastern United States, and in other parts of the United States and Canada, the smoke produced by the boreal forest fires is incredibly dense and foreboding. Unlike many forest fires where flames tear through the tree crowns and move on, boreal forests burn as much at the ground level because of extensive flora as well as other biomasses like peat.
Code Red begins the unhealthy level for general population, with Code Purple equal to very unhealthy and Code Maroon the worst of all, with hazardous conditions. The 509 AQI recorded Saturday was the highest of the stretch since these fires began in early May. Poor air quality is likely in many of the same regions over the next few days, while ahead of low pressure to the west. Some of the worst air may creep into New England late Monday into early Tuesday, as smoke also rotates southward on the back of the low across the Upper Midwest.
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