There Was Another Weird Rain Delay at Nationals Park

They've now had two really...weird?...rain delays.

The Nationals were supposed to play the Giants at 7:05 p.m. at Nationals Park on Friday night. A thunderstorm that had been forecasted postponed the start of the game, and it seems the MLB kept everyone in the dark from there on out (the league has final say on all rain delays after the All-Star break). The game wasn't officially postponed until 9:48, nearly three hours after the initial game time. 

This is sort of unprofessional of the league if true and it's weird, but what's weirder is that it's not the first time the Nationals have had a very weird rain delay. 

Back on July 6, a Nationals-Braves game at Nationals Park was delayed for three hours. The only problem is, it didn't really rain—the Washington Post described the precipitation as happening only "barely," and reported that it didn't rain until hours into the delay. 

I feel like this is not that hard. If it's raining and there's lightning in the area, you postpone the game. If it's not raining and there's no lightning in the area, you don't postpone the game. Am I missing something?