Tefnut is the goddess of moisture and the twin sister-wife of Shu, mother of Nut and Geb, and the second generation of the Heliopolitan Ennead. She is one of the goddesses who can act as the fiery Eye of Ra, and in the tale of the Distant Goddess she withdraws to Nubia in anger and is coaxed home - as a lioness, a cat, or the monkey Thoth becomes - amid music and rejoicing. Her return is the return of moisture, and her name probably imitates the sound of spitting, which belongs to the creation account.
Modern Practice
Tefnut is called for humidity, rain, and the return of what has withdrawn: a person, a feeling, a working that went dry. The practice makes the offering first and then waits, keeping the return in view rather than forcing it.