As if the SATs aren't scary enough, our favorite quartet of high school classmates face another frightening challenge on Tuesday's new episode of Pretty Little Liars:

An epic weather alert.

Aptly titled "The Perfect Storm," the installment will introduce Alex to Spencer's mother, while also cause us to wonder what the heck Emily is up to. At least that was our reaction upon watching one of the three clips below.

Check them out now and visit our Pretty Little Liars spoilers section for a look at what else lies ahead:

[video url="http://www.tvfanatic.com/videos/the-perfect-storm-clip/" title="The Perfect Storm Clip"] [/video]

[video url="http://www.tvfanatic.com/videos/meeting-alex/" title="Meeting Alex"] [/video]

[video url="http://www.tvfanatic.com/videos/sat-studying/" title="SAT Studying"] [/video]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.