This can be translated as a statement. Alternate translation: "I am the one who can pour out the water skins of the sky." (See: [[rc://en/ta/man/jit/figs-rquestion]])
These are skins that people sew together so that they can hold water. Yahweh refers to the thick clouds as "waters skins" because they hold much water just like water skins. (See: [[rc://en/ta/man/jit/figs-metaphor]])