Tomorrow’s Powerball jackpot — already guaranteed to be the second-largest ever — could break the record by the time the ticket-buying frenzy is over.

The kitty is estimated to be worth $550 million following a surge in sales yesterday.

That’s a leap of nearly $200 million since Wednesday’s drawing failed to award a $360 million top prize.

But officials expect the jackpot to keep growing, so it has a chance of breaking last November’s Powerball record of$587.5 million.