Severe storm leak

A severe thunderstorm just concluded at my home. During the height of the storm, rain was blowing sideways. I noticed spattered water in the doorway of my master bath and looked up to find water beaded on the top of the door frame, which was formerly a window and is the point of attachment to the house (the bath was added five years ago). I've never had a leaking problem before, there's no sign/stain of previous leakage, and while standing there as the storm subsided, no more water came through. What should I do to seal the opening this came through (although I'm not sure where it did, except somewhere along the roofline).
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