The central storm was immense. It divided entire regions from the peripheral territories and created a tall blockage that prevented any living being from exploring its insides.
Also, winds would often escape its surface and fly through the separate dimension in the form of violent tornados. It became clear that some of the gales in that world weren't a natural phenomenon caused by the high density of "Breath" but came from that massive structure.
Noah didn't need to activate the Divine Deduction technique to understand that crossing the storm would be hard. Something so huge and containing such dense laws was bound to affect the areas above and under its frame.
Moreover, there was a high chance that the environment on the other side contained living beings in the sixth rank!