"At this point, we have moved into recovery rather than rescue mode," Packer said Monday, acknowledging there was a growing conviction that Huynh had drowned.
Monday's search effort included a sheriff's fixed-wing aircraft, three Utah State Parks and Recreation boats, several sheriff's watercraft and numerous volunteer boats.
However, Packer said a series of thunderstorms and rain showers moving through the region periodically interrupted the search efforts.
"We've been playing hide-and-seek with the weather all day," Packer said, noting that it wasn't until early afternoon that the weather cleared long enough to get aircraft patrolling over the lake.
Saturday and Sunday searches along the shoreline and throughout the northern end of the harbor failed to turn up a trace of Huynh. A Utah Department of Public Safety helicopter also assisted in the effort, and search and rescue workers also used sonar to probe beneath the waves.
Family members told police that Huynh headed out on the water about 9 a.m. Saturday. His empty boat was not spotted until about 6:30 p.m. that evening.
Packer said that officials ended the search for Huynh at dark Monday evening and that the search would resume at 9 a.m. Tuesday.