National Weather Service United States Department of Commerce

Dangerous heat continues across the area into this evening and lingers into tonight and Wednesday from the Brainerd Lakes east into northwest Wisconsin. Temperatures moderate slightly after today with slightly lower dewpoints, but some Heat Advisories may be needed for southern portions of the Northland through late this week.
Critical fire weather continues through this evening across portions of the Borderlands and BWCA, where a Red Flag Warning is in effect. Low relative humidity, very hot temperatures, and a west to northwest wind will combine with very dry fuels. These conditions could lead to the rapid spread of wildfires. Near-critical fire weather conditions may be possible Wednesday for much of northeast Minnesota due to low relative humidity.
Air quality alerts have been issued due to wildfire smoke for today through Noon Thursday in Wisconsin, and until 11 AM Friday in Minnesota. Air quality is expected to reach the Very Unhealthy (purple) to Hazardous (maroon) category for much of the Northland. You can find more information about these alerts from the MN PCA https://www.pca.state.mn.us/ and the WI DNR : https://airquality.wi.gov/