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That's possible.
There are multiple ways the atmosphere can help or hurt reception. Tropospheric enhancement is mostly weather related in the lower layers of the atmosphere. The most regular of these effects is caused by thermal inversion, which occurs most evenings as the air cools and the warm ground radiates heat. Much stronger effects can be observed when weather fronts move through the area.
There are also events that happen in the upper atmosphere (like meteors and solar flares) that can have a dramatic effect long distance reception.
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