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Canadian wildfire smoke engulfing Upper Midwest and Northeast

Thousands of visitors were told to evacuate a remote Minnesota wilderness area accessible only by boat as wildfires send dangerously heavy smoke over the U.S. Midwest and Northeast this week.

More than 100 wildfires are burning in Canada, and winds are carrying the smoke southeast. The most intense smoke could spread as far south as Washington, D.C., by midday Thursday.

Warnings about unhealthy air conditions Wednesday extended from Minnesota through Toronto and into New York. Unusually hot summer temperatures were expected, too.

Minnesota rangers were trying to warn people that the Boundary Waters Canoe Area Wilderness was closed Tuesday because 17 fires caused by lightning more than a week ago were spreading through the vast wilderness accessible primarily by canoe.

Rangers estimated anywhere from 6,000 to 10,000 people were inside the 1.1-million-acre wilderness, which is almost the size of Delaware.

No injuries or deaths have been reported. Rangers were going through every lake and waterway and officials estimated they had about 90% of the people out Wednesday.

Campers rescued this week said skies quickly darkened from smoke and they could feel the heat as they paddled or were taken by boat to safety.

Dan Westervelt, at Columbia University’s Climate School, said severe drought conditions combined with heat in Canada and the U.S. have created “a perfect storm for really dry conditions to provide a lot of fuel for these wildfires to burn.”

It’s been a particularly busy and deadly fire season in the U.S. About four dozen large fires are currently burning across 15 states, from Minnesota and North Carolina to Colorado, Utah, Idaho, Oregon and California.

In Minnesota, officials warned large fires could burn for months.
5 hours ago