The tarp is covering the infield at ASA Hall of Fame Stadium. There are lots of dark clouds to the south and southeast of the stadium. According to weather.com, the updated forecast calls for "showers and thunderstorms continuing through late evening."
The radar from a local television affiliate, as of 5:35 p.m., showed a lot of "bad color" moving into the Oklahoma City area. There are flood advisories issued for counties to the southwest of Oklahoma City.
The good news is that the rain stopped around noon and there hasn't been significant rainfall since then.