sky
霄 centers on the sky, especially the high, open expanse above.
霄 combines 雨 (rain) with 肖, which likely contributes the sound. The character expresses the sky or heavens, possibly through the image of rain falling from above.
Rain 雨 falls from the sky, and 肖 looks like a tall, open structure. Together they picture the vast sky where rain forms.
For ショウ, imagine a dramatic sky show: lightning and rain put on a show in the sky. Show -> ショウ.