UFO Sighting in Glendale, Arizona on October 21st 2015 – Fireball flew up then disappeared

My husband, mother-in-law and I were heading out for one more smoke before bed. We went out on the back patio facing east. I come around to the patio table and notice what looks like a ball of fire. A solid nonflickering ball of perfectly circular fire. Yellow in the center fading to deep red around the edges. It had been raining and the skies were finally clear. I watched the object start moving and heading up at like a 45 degree angle. I then pointed it out to my husband who pointed it out to his mother. My husband and I watched as this thing sped up. Faster and faster until it got so far away we couldn't see it anymore. We were both completely baffled with no clue what it was.