On Saturday August 11th around 10pm, the Las Vegas Valley received some very high winds.  This affected many resorts up and down the Las Vegas Strip.  The most damage it appears was at the Wynn Resort and Casino.  The very high floors had several windows blown out.

Photos taken by VegasChanges.com on Sunday afternoon (8/12) and Monday (8/13/2018).

On the top of this photo you can see the windows that were blown out on Sunday 8/11/2018.
Window damage at the Wynn facing North.
Window damage at the Encore facing North.