The United States is currently experiencing a dual challenge: widespread wildfire smoke from Canada and an extreme heat wave. As of July 15, 2026, over 830 wildfires are raging in Canada, with more than a dozen in northern Minnesota, leading to mandatory evacuations. The situation is particularly severe in west-central Ontario, where thick forests are being consumed, releasing vast amounts of smoke.
The wind patterns are directing this smoke into the US, creating hazardous air quality conditions for millions across the upper Midwest and Northeast. This smoke is exacerbating the effects of an ongoing extreme heat spell, with temperatures expected to soar into the high 90s to triple digits in many areas.
Smoke Spread and Air Quality Alerts
On Wednesday morning, very heavy smoke was observed over Duluth, Minnesota, and Marquette, Michigan, with extreme smoke conditions in northern Wisconsin. By mid-morning, some of this heavy smoke was expected to move over New York state and New England, potentially reaching New York City to Boston by 2 p.m. ET. By sunset, the smoke was projected to stretch from Buffalo to New York City and Philadelphia, affecting areas like Green Bay, Milwaukee, Grand Rapids, Detroit, and Toronto.
While the conditions in New York City are not anticipated to be as intense as the June 2026 event when skies turned orange due to Canadian wildfire smoke, hazy skies and unhealthy air quality are still expected. The situation is particularly concerning for those with respiratory issues, but the smoke levels may reach dangerous levels for everyone.
Air quality alerts are in place from Minnesota to New York City, including the entire states of Wisconsin and Michigan. The smoke is expected to be most severe on Thursday, affecting areas from Duluth to Green Bay and Marquette, as well as much of northern Michigan. Cities like Cleveland, Columbus, Baltimore, and Washington, D.C., are also expected to experience heavy smoke.
Extreme Heat and Its Impacts
The extreme heat is not limited to the areas affected by wildfire smoke. Along the East Coast, from Washington, D.C., to New York City, temperatures could climb to near 100 degrees on Wednesday. Heat indices, which account for humidity, are expected to make it feel like 104 degrees in New York City, 105 in the nation’s capital, and up to 107 in Philadelphia. The hottest day of the Northeast heat spell is likely to be Wednesday, with cooler temperatures moving from north to south in the coming days.
Minneapolis remains under an extreme heat warning through Thursday, with the heat index expected to be near 100. The combination of high temperatures and humidity is creating sticky conditions, with humidity levels of 50% to 55% in downtown Los Angeles. This humidity means that conditions do not cool as much at night, with many areas reporting nighttime lows in the high 60s to around 70 degrees. This can prolong the stress that heat places on the human body, depriving people of a chance to recover.
Fire Risk and Preparedness
In Southern California, a heat wave is expected to peak on Wednesday, with temperatures forecast to be 10 to 17 degrees above normal. This heat, combined with a surge of monsoonal moisture, is creating sticky conditions and elevating the fire risk. Vegetation in the region is relatively dry as it heads into peak fire season, and any ignition could quickly take off, especially in areas experiencing gusty, drying winds.
The National Weather Service issued a red flag warning for L.A. County’s I-5 corridor and the Ventura County mountains from Wednesday afternoon into Thursday morning. This warning also encompassed the Santa Barbara south coast and mountains, where sundowner winds could gust to 35 to 50 mph and bring temperatures into the 90s along the coast and the triple digits in the foothills.
In response to the elevated fire risk, the Los Angeles County Fire Department pre-deployed 15 fire engines, four water tenders, four hand crews, two bulldozers, and additional dispatch personnel. The Santa Barbara County Fire Department also stepped up staffing, adding a hand crew, strike team, water tender, helicopter, bulldozer, and an extra dispatcher in its dispatch center. These extra resources were placed throughout the county at 8 a.m. and will be available through 8 a.m. Friday.
Conditions are expected to cool off by 5 to 7 degrees on Thursday and then return to nearly normal by Friday. While it is unclear to what extent climate change is influencing this particular heat wave, scientists have found that global warming from the burning of fossil fuels is making Western heat waves more frequent, persistent, humid, and lethal.
