Perhaps she saw it coming. “So why’d you have to rain on my parade?” Taylor Swift sang on “This is Why We Can’t Have Nice Things,” according to the website Genius. The lyrics from her 2017 album “Reputation” are fitting as both the Grammy Awards and a massive downpour approach Los Angeles on a collision course. “This is shaping out to be a life-threatening flooding situation, especially during the Sunday through Monday time period,” the National Weather Service said Thursday, according to Fox Weather. National Weather Service: “THE LOS ANGELES RIVER WILL FILL QUICKLY AND BECOME A RAGING RIVER …