Sky or Skies

In a post before this one, I titled it: Partly Cloudy Sky. Why am I pointing this out? Because what irks the shit out of me, is when the local and national TV, along with the radio weather forecasters, always, without a doubt, say “skies” when it should be “sky”. When we look up at the sky, we only see one sky, not two. So why do they insist on using the plural, instead of the singular word? Are they that stupid, that it is obvious that there is, and will always be one and only sky. Get with the program. That’s it.