It's been a while, but there's a giant Powerball jackpot that's expected to have a prize of $317 million by Wednesday night's drawing.

The total is a return to form for Powerball, which has been known along with Mega Millions for its record-breaking jackpots in recent years. But there's been something of a drought, with nearly a year passing since the Powerball total climbed above $300 million.

Lottery officials say there's no particular reason for the lull.

Terry Rich, president of the North American Association of State and Provincial Lotteries and CEO of the Iowa Lottery, says lottery jackpots are inherently random. He says the game is expected to have slow periods based on projection models.