Why will the snow clear up the day after tomorrow?

Rainfall is caused by updraft, cooling and condensation. When there are no rain clouds in the sky, after nightfall, the heating on the ground is exhausted, forming a low-altitude cold fog, but there is no rising warm current upwelling, so it will be sunny after the fog clears.

In the same way, after the snow falls, a cold air flow is formed at low altitude, which is too heavy to rise, so it can't condense into rain, and it is mostly sunny after the snow.