100% chance of popcorn

I don't even understand what does this mean hahaha @erikchazin pic.twitter.com/4KuzVKr6zN
— Audrey Johnson (@aud_31) April 10, 2013

"What does this mean, aliens coming down? Like what?" 😂 @djones236 pic.twitter.com/0IbX0xwp
— Haley Hilliard (@Hale_Stormmmm) January 28, 2013

what does this even mean... why is the snow jumping pic.twitter.com/Q3uLrVng
— heisenberg (@theyycallmeCarl) December 26, 2012

seriously what does this even mean.. it's raining bouncy balls? pic.twitter.com/DIi1raBL
— Wilsynn Wheat (@wilsynnnn) January 24, 2013

Guys... What the hell is gonna happen tomorrow? I'm scared... What does this mean?! pic.twitter.com/PVeNnjgBNp
— Payton Nooney (@PaytonNooney) April 23, 2013

What does this mean? Is it 100% chance of popcorn? If so, it'll be an early morning of cold popcorn collecting... pic.twitter.com/uXCSCe77Zh
— Adam Braun (@akbraun16) April 9, 2013

Have people not seen hail? Or maybe it will rain bouncy balls? Or maybe aliens are landing?

Is there a semiotics problem here?