What about if the Elemental is inately invisible?

@JeremyECrawford What about if the Elemental is inately invisible? Can you see it or at least aware of its location?

— Mike Doyle (@Smokeontheraze) November 23, 2016

If a spell gives you a special sense, such as the ability to see an invisible creature, it tells you so. #DnD https://t.co/BF9RYmie7d

— Jeremy Crawford (@JeremyECrawford) November 23, 2016