The sky is yellow-orange?

We were supposed to get some sever weather, but it barely rained earlier and there was a lot of thunder and some lighting. As of right now, it's calm, a light breeze, no rain, and no thunder. However about 15 minutes ago outside was all yellow, everything had a yellow tinge. Then it went to a yellow-orange, and now it's like a pink orange. It's completely dark in the house like it would be if it was dark outside, but it's still light out, just pink/orange. What does this mean???????