The remains of a huge plume of smoke from wildfires in western Canada were draped across the Eastern Seaboard on Tuesday morning. Air quality alerts remained in effect for parts of 16 states in the east.
The ongoing outbreak of wildfire smoke first entered the Lower 48 on Friday. Smoke was driven deep into the South by a powerful low-pressure area near and north of the Great Lakes as well as the steering currents of the jet stream.
Some of this outbreak’s high daily average air quality index values — all in the unhealthy Code Red zone — include:167 in Pierre, S.D., on July 15. 167 in Havre, Mont., on July 16. A band of unhealthy air extended to near Chicago, where daily AQI values reached 152 in the southwest suburb of Joliet.Were it not for the smoke, the weather in this region — sourced from the cool winds of Canada — would have been magnificent for mid-July.
As with the current outbreak, any upcoming pushes of smoke would, at least for now, come from Canada’s west. Smoke from western Canada tends to not be quite as thick and close to the ground in the eastern U.S. compared to plumes from eastern Canada.In eastern Canada, the largest fires in Quebec are presently east of James Bay on the southern end of Hudson Bay, and winds are pushing their smoke to the north and northeast, away from the United States.
With about two months to go in Canada’s typical fire season, it remains doubtful that most parts of the northern and eastern U.S. have seen the last of wildfire smoke — from either the west or the east.
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