What the hell is this?

This was taken March 15th from the 35th floor at the SIlver Legacy.

The weather was weird at the time with snow showers drifting through, but that really doesn't explain this. Nothing on the evening news and no demolition going on at the time.. It seemed to twirl at the bottom. If it was a tornado I would think they would have had it on the news?? Sure would appreciate help with this.

Thanks! Dee Coffman from Auburn, WA.