I watched the live stream in time to see this pass. It sounds like a dust storm is headed that way.
First dust storm went by quick. Second one lasted a bit longer. It got "cold" (for AZ) and the wind got bad, they finished our the last race. Burn out and sled pulls were cold and windy but didn't effect the racing. Bat mobile went down, I think they said the up pipe blew apart. Lots of nice passes from top to bottom. Good event and good venue, they'll be back next year, they locked up a 3 year deal.
Once I get home on Wi-Fi I'll try to upload some videos I took.