A pall of thick wildfire smoke invaded northern Minnesota on Wednesday, causing its air quality to deteriorate to Code Red levels — signifying unhealthy conditions for the general public.
, or particulate matter that is 2.5 microns and smaller. These fine particles can travel deep into the lungs and enter the bloodstream, leading to a number of detrimental health consequences.Wildfire smoke is particularly difficult to forecast, but computer models — which simulate different atmospheric features — can offer a general idea of where it is headed.
Through Thursday, near-surface smoke is projected to drift south and southwest across the Upper Midwest. More locations in Minnesota, including the Minneapolis metro area, may experience unhealthy air quality. Portions of the Dakotas and Wisconsin, and perhaps into Iowa and surrounding areas, may also be affected.In Canada, dense surface smoke is set to continue near and around the biggest fires in central and northern portions of British Columbia, Alberta and Saskatchewan.
Much larger zones will see smoke at higher altitudes, whisked along by the jet stream. While some of this high-altitude smoke may make it to the ground and compromise air quality, a greater portion of it will probably remain suspended aloft where it is not harmful. By Friday, some haze may return to the Interstate 95 corridor from Washington to Boston, and the northeast quadrant of the United States more broadly, but probably again at high altitudes.
Looking ahead to next week, the weather pattern may enable more smoke from eastern Canada to work into the northeastern United States, but it’s not clear how dense the smoke will be or when it will arrive.
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