Smoke is trapped by an inversion in Sequoia Kings Canyon National Park. NPS helitack photo.
In this photo taken Wednesday, smoke is attempting to break through an inversion over the Mosquito prescribed fire in Sequoia Kings Canyon National Park in California.
Normally, as you rise in altitude, the temperature decreases due to the changes in air pressure. In a weather (or temperature) inversion, instead of getting cooler at higher temperatures, it is actually warmer higher up.
Cool air trapped under a warmer layer, creating an inversion. From Fortair.org.
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One of the risks we take with the prescription burn. It could also block a major freeway or airport.