Mike called from Camp IV to say that he was leaving for the summit at 10 p.m. on 5/21 (Nepal time) and hopes to be on the summit the morning of 5/22. He has 16 hours of oxygen which should allow him to reach the summit and all or most of the way back to Camp IV. The weather looks good – no precipitation, but there may be some wind. He will not have his satellite phone on the summit so will call when he is back to Camp IV.