An incredible time-lapse video shows the moment a towering wall of thick dust engulfed Phoenix Sky Harbor Airport on Monday evening, grounding flights and even damaging part of the roof of Terminal 4. Phoenix is in the middle of its annual monsoon season, and with it comes the threat of severe thunderstorms and dust storms… The post Incredible Timelapse Shows Dust Cloud Engulf Phoenix Sky Harbor Airport Leaving Flights Grounded appeared first on PYOK.