The storm was scheduled to hit the Augusta, Georgia, area at 4pm local time but is now likely to arrive before 1pm - increasing concerns the Masters may go to a rare Monday finish. He emerged with another rock-solid round that looked spectacular only on his scorecard.
Play will begin at 9:30pm (AEST) with the leaders to tee off at 11:20pm (AEST).
They are sizeable obstacles between Woods and his first Masters win in 14 years, and a first major triumph in 11.
Nervous Masters spectators asked themselves two things Sunday: Could Tiger Woods beat the field for his 15 major championship?
"I know how to play this golf course; now it's a matter of doing it, " Woods said. "I thought I hit a lot of good shots".
Molinari was at 13-under 203.
I liked his post-round interview, where he said that he was just going to do what he can do and was calm about everything. He drives the ball so beautifully, has great iron play and is putting well.
"I think, to be honest, every tournament is different and every time is different", Molinari said.
Four of the last five champions at Augusta held at least a share of the lead heading into the final day. He brings momentum to this major, having contended in the last two.
Woods was also slow to join the birdie bandwagon, opening with four straight pars before a bogey at the fifth.
Finau, chasing his first major title, fired a bogey-free eight-under 64.
The inaugural Women's Amateur championship marked another major breakthrough at Augusta National, with its long-standing reputation as a haven for rich, white, well-connected men.
Woods, who entered the week an incredible 156 under on the par 5s for his career (he's a cumulative 68 over on the other holes), has had to spread his efforts around.
I was nine years old the last time Woods won at Augusta.
"I had a pretty good number", he said of his second shot. Molinari, playing in the final group, kept right on rolling.
"Costantino has been a huge [role] model and a huge motivation", Molinari said.
Woods was in the clubhouse with a 5-under 67, his best round of the tournament.
"In a way I am quite happy that I did not shoot a par on the last. It will be an exciting day tomorrow".
Bryson DeChambeau has made a hole-on-one on No. 16 in the final round at the Masters. He still managed to tie for 10th in his first Masters.
Woods, Brooks Koepka and Dustin Johnson were among 10 players within five of the lead.
He took advantage of the break, punching his second shot to wedge range and then skipping his next up to set up a birdie.
The crowd favors Woods. "I've really worked on everything with the Masters in mind from the start of the year, much like I did in 2013", the 38-year-old Australian said. Molinari sees it another way.
"But if it starts to blow, starts to get windy, starts to rain, the golf course is an animal to play when it's in tough conditions". Amateur Takumi Kanaya is tied for 39th after his 3-under Saturday brought him back under par for the tournament. The Listowel, Ont., shot a 1-under 71 to stay within sight of the leaders at minus-7.
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