We were so intrigued by this WeirdWeather, we asked goes_by_kim to dig into it.
NWS CaribouResidents of Washburn, Maine, experienced an otherworldly weather phenomenon known as an inversion amidst frigid temperatures of minus 25°F over the weekend. A cloud layer hung low and thickly over the valley, as if the ground had been elevated to the heavens and into a dreamscape.
As the name suggests, an inversion occurs when the vertical temperature profile of air flips. Temperatures usually drop higher up into the troposphere, the atmosphere’s base and, weather-wise, the most happening layer. There, lower atmospheric pressure and the ground’s natural ability to absorb heat from the sun during sunlit hours keep air warm. But during an inversion, aided by snow cover and still winds, warm air may ascend above cold air and trap it underneath.
Occasionally, the air hugging the ground can cool more quickly than air at higher altitudes, especially during a wintry day, as had occurred in Washburn. Low-lying places are more prone to this cooling, especially in sheltered valleys where winds can’t cause a stir, so they become a sump of cold air. Warm air—as warm air always does—rises, and cages the cold air beneath, for several days.
An inversion is which is when temperature warms with increasing height. Seen visually here in Washburn this morning, where the temp was -25F at the time. Rising steam didn't make it far before it was cooler than the air around it, so it flowed down the river valley instead.
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