Clear skies are expected, except for southwestern regions after midnight, where high-level moisture will be spreading northward (illustrated below) from the southern US as well as low-level moisture that will probably cause cloudiness by Tuesday morning over southwestern Ontario. A noteworthy problem for sky observers could be fog development during the night, due to strong nocturnal inversions developing under the clear skies, and high humidity caused by snow sublimating during Monday afternoon under the sunshine.
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