Kelly and the Diamondbacks won't face the Nationals on Thursday after the game was postponed due to hazardous air conditions in Washington, Jesse Dougherty of The Washington Post reports.
As a result of the postponement, the Diamondbacks will likely move Kelly back a day in the schedule and have him pitch Friday's series opener in Detroit. The veteran right-hander has been fantastic this season, posting a 2.80 ERA across his first 12 outings.