But fortunately for the Tar Heels, the Nittany Lion attack dissipated as quickly as the inclement weather.
UNC held off Penn State's early offensive onslaught and defeated the No. 8 Nittany Lions 3-0.
The win was the second of the weekend for North Carolina. The Tar Heels opened play in the Carolina Nike Classic with a 5-0 victory against Charlotte on Friday.
After a 25-minute weather delay, North Carolina found itself trapped in its defensive zone, battling Nittany Lion forwards Bonnie Young and All-American Christie Welsh. Welsh smacked a shot off the crossbar in the sixth minute.
"After the first 10 minutes when all the adrenaline settled down, I thought we did a good job of settling into our rhythm, a one- and two-touch game," said UNC assistant coach Chris Ducar.
North Carolina coach Anson Dorrance left the field before he could be reached for comment.
As the overhead clouds became less threatening, so too did the Nitanny Lion's attack.
In the 17th minute, forward Alyssa Ramsey scored on UNC's first shot.
Penn State goalie Emily Oleksiuk left the box to snag a loose ball, but a charging Anne Morrell headed it away and centered it to Ramsey, who scored.