Search and rescue crews are still looking for Laurence Howard, 79, Nichol in Monongalia County.
Monongalia County's Office of Emergency Management said the National Guard joined the search of more than 40 volunteers Wednesday.
Search teams have been working since 4 p.m. Tuesday.
Officials said because Nichol suffers from Alzheimer's, crews are taking a different approach in the search.
"There is a search method that people use," said Mike Wolfe, of MECCA. "A lot of times they will travel in a straight line or one certain direction, something they're more familiar with. And that's what we've been concentrating on today."
Howard was last seen around 1:30 p.m. Tuesday in Morgantown.
If you have any information, contact state police at 304-624-7573.
The West Virginia State Police has issued a silver alert for a missing man in Monongalia County.
Laurence Howard Nichol, 79, was last seen around 1:30 Tuesday afternoon on Turtle Creek Drive in Morgantown, according to a press release issued by state police. He was wearing a red jacket, light pants, and brown shoes.
State police said Nichol has severe Alzheimer's, minor non-treated cardiac issues, and walks with a limp. He is 5 feet 10 inches and weighs approximately 145 lbs. Nichol has blue eyes and gray hair.
State police said he should be wearing glasses and has a note in his pocket with his name and contact information on it.
If you have any information, please contact state police at 304-624-7573 or the Monongalia County Sheriff's Department at 304-291-7260.