Wildfires in Minnesota are putting out smoke. Lots of it.
Right now it is hanging high in the sky, mostly harmless from where most of us stand. But the air doesn’t stay put. The National Oceanic and Atmospheric Administration sees a shift coming. A high-pressure system is cooking the central U.S., creating a clockwise swirl that will push that plume down. Toward the ground. Toward the southeast.
Over the next couple of days, cities like Detroit, Milwaukee, Cleveland, New York City, and Philadelphia might get the full effect.
This isn’t just a light haze. We are talking about PM2.5 pollution. Tiny particles. Small enough to bury themselves deep in your lungs. On the Air Quality Index scale, you are looking at “unhealthy” levels in red, or possibly “hazardous” in maroon. That is the kind of air you do not want to breathe.
Is it scary?
Maybe. The numbers are shaky though. Jeff Masters, a meteorologist, wrote on Bluesky that predicting this stuff is hard. Really hard. Models often miss the mark. They might be way too high, or way too low. They are still immature, struggling to pin down the meteorology, the fire behavior, and the chemistry all at once. So keep that uncertainty in mind while you watch the alerts.
When it hits, look up. The sky might turn hazy, orange, maybe even reddish. The particles scatter the blue light, letting the longer wavelengths slide right through. It looks cinematic for a minute, but it’s bad air.
Forecasting wildfire smoke is HARD… models have to get the meteorology, the fire behavior and atmospheric chemistry right. — Jeff Masters
Minnesota fires are strange in early summer. Usually, things are wet. Fire season is supposed to be spring or fall. But the weather has been exceptionally hot and dry. Drought left the vegetation parched, dry as kindling. All it takes is a spark.
Lightning provided them last week in the Boundary Waters Canoe Area Wilderness, hitting spots within the Superior National Forest. Winds didn’t fight back, they fanned the flames instead. Parts of the forest are closed off. Minnesota’s Governor, Tim Walz, has declared an emergency so the National Guard can jump in.
The smoke is moving. You might want to stay indoors for a while, or keep your mask nearby. It doesn’t look like it is going anywhere fast.
