That very question came up in my mind just yesterday. Hosea says: (paraphrased)
after two days he'll revive us, on the third day He will raise us up to live in his presence.
I think they're will be two catching aways: I think Rev may confirm this:
the 144k
the 2 witnesses-which I believe are Jews and Christians, Is 43
The 144k are the first fruits which I believe will be caught up on the 3rd day (of Passover) so I was thinking the outpouring could be the 2nd day of the week of Passover.
Think on this verse:
Hebrews 11:35Women received their dead raised to life again: and others were tortured, not accepting deliverance; that they might obtain a better resurrection:
here's a link if you want to read the whole chapter:
http://www.biblegateway.com/passage/?search=Hebrews+11&version=KJV