High vapor levels around droplets and lower concentrations over ice will tend to homogenize by random molecular motionsÉDIFFUSION.
	Thus water vapor molecules over liquid will move towards ice crystals.
	Vapor pressure over ice becomes larger than SVP over ice, smaller than SVP over liquid droplet.
	Droplets will shrink as liquid evaporates to replace evacuated vapor molecules.
	Supercooled water droplets will be attracted to ice crystal, where they freeze/adhere on contact.