Flags That Fly 24/7
At sunrise, the American flag is lowered to half-staff, raising the flag to full-staff at noon.
Flags That Fly Daylight Only
At sunrise, when raising the American flag, raise the flag to full-staff, pause a moment, then lower the flag to half-staff, raising the flag to full staff at noon.
Flags On Fixed Poles
U.S. flags flown from fixed poles, such as mounted on the front of a house, can use black streamers to signify honor and mourning. This article that explains how. The ribbons are removed at noon, as other U.S. flags are raised to full-staff.
photo courtesy Flickr