CAIRO — The cease-fire between Hamas and Israel will go into effect Sunday at 8:30 a.m. local time, mediator Qatar announced Saturday, as families of hostages held in Gaza braced for news of loved ones, Palestinians prepared to receive freed detainees, and humanitarian groups rushed to set up a surge of aid.

The Israeli security cabinet meeting to vote on a ceasefire deal with Hamas, which was delayed yesterday, is set for today. And, frigid temperatures are expected to envelop much of the U.S. next week.