Ellen Pompeo, Chandra Wilson and Sandra Oh Ellen Pompeo, Chandra Wilson and Sandra Oh

A storm is brewing on Grey's Anatomy. Literally.

Although an initial report suggested there wouldn't be a large-scale disaster in the finale, executive producer Shonda Rhimes recently tweeted that the writers have changed their plans for the season-ender — and she wasn't kidding.

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TVGuide.com has learned that a super storm will be heading towards the Grey Sloan Memorial Hospital beginning in the penultimate episode, "Readiness Is All," and reaching its full, violent force by the May 16 finale, aptly titled "Perfect Storm." The docs will go into crisis mode as the storm ravages the hospital. Further details on the finale — like whether McBaby will come during this perilous time — were unavailable, but we hear it's going to be a very intense finale.

In March, Rhimes tweeted about planning the season-ender, stating, "We made some very bold, shocking decisions. Wow." With that said, how much are you Grey's Anatomy fans freaking out right now? Hit the comments!

Grey's Anatomy airs Thursdays at 9/8c on ABC.