Following are a number of back-translations as well as a sample translation for translators of Isaiah 30:30:

• Kupsabiny: “God shall make his words be heard,
  and he shows his power when he is angry.
  He shall come with fire that burns strongly
  together with thunder/lighting and whirlwind
  and the rain of hails.” (Source: Kupsabiny Back Translation)
• Newari: “Expressing His great anger, setting fire that will devastate beyond repair,
  also with resounding voice and whirlwind and hail,
  The LORD will cause people to hear his great and powerful voice
  and will allow the light of his shoulder to be seen.” (Source: Newari Back Translation)
• Hiligaynon: “The LORD will-cause-to-be-heard his roaring voice, and he will-cause-to-show his hand which is already ready to punish in so much anger. This will-be-accompanied by a blazing fire, a sudden drop of rain, thunder and lightning, and rain of ice as-if-like rocks/stones.” (Source: Hiligaynon Back Translation)
• English: “And Yahweh will enable us to hear him speaking powerfully/majestically.
  He will show us that he is very powerful.
  We will see him smash his enemies.
  Being very angry, he will descend with a big rainstorm and thunder and hail to punish them.” (Source: Translation for Translators)