A sister of missing Te Atatū woman Monica Reid is appealing for people to keep an eye out for her as a major police search amps up.

Police this morning launched a large search-and-rescue operation amid serious concerns over the welfare of the 26-year-old, who has been missing since Friday afternoon.

Imogen Trupinic said she had seven siblings and “each one is unique and amazing in his/her own way”.

“We’re a very large and very close family. Monica is the youngest of the family - 12 years younger than me,” Trupinic said in a Facebook post.

“She works at [New Zealand Transport Agency] Waka Kotahi and is studying planning. She previously studied drama and Italian.”

Police involved in the search for missing woman Monica Reid.

Trupinic also revealed Reid was in the process of buying a house with her fiance.

“She has years of joy ahead of her. We are desperately trying to find her,” she said.

“Please keep an eye out for her, especially if you are in the West Auckland area.”

A temporary base at the Waitematā Rowing Club has been established with multiple search groups in attendance.

Those currently at the Taikata Sailing Club include frontline police, the Police Maritime Unit, Land SAR (search and rescue), police SAR and detectives.

“Monica remains missing, and inquiries remain ongoing to locate her,” the police said today in a statement.

Police at Henderson Creek join the search for Monica Reid.

A photographer at the scene said specialist teams were using an unmanned aerial vehicle to conduct searches along Henderson Creek.

The police helicopter is also involved in the search, and the maritime unit is conducting a shoreline search from their vessel.

Police are urgently seeking sightings of Reid, who was last seen on Matipo Rd on the Te Atatū Peninsula.

“Monica has been reported missing by her family and there are concerns for her welfare,” the police statement said.

Monica Reid, 26, has been missing since Friday. Photo / NZ Police

Her brother Francis Lucian Reid has created an official missing persons post.

“We all just want her to be safe and we hope she’s found soon,” he said.

A family member said Reid “is a much-loved friend, sister and aunty”.

Police have launched a search-and-rescue operation in Henderson Creek.

She is believed to be wearing a purple/pink puffer jacket.

“If you think you may have seen Monica since yesterday afternoon, or have information which might help us find her, please call 111.”