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Why Clouds Vanish During Solar Eclipses - Atlas Obscura

"In 1972, a group of umbraphiles gathered in Nova Scotia to witness a total solar eclipse. Just before the celestial event was to begin, clouds completely obscured the view. One of the group members, now-retired geoscientist Steve Dutch, recalled that, as the eclipse began, the clouds suddenly fled. "All of us had perfect views," he wrote in an online post.

The clearing wasn’t a fluke or divine intervention, but the now-documented reaction of certain kinds of clouds to solar eclipses.

Cumulus clouds—the low-lying, fluffy ones with flat bottoms and poofy tops—dissipate as an eclipse begins, according to a recent paper in the journal Communications Earth & Environment"
https://www.atlasobscura.com/articles/why-clouds-vanish-during-solar-eclipses