Around 850 people hunkered down in severe weather shelters across the tri-county area Thursday night as dangerously cold temperatures and piercing wind continued to threaten Portland’s most vulnerable residents. Multnomah County served 656 people and Clackamas County served 135 on Thursday night, officials said. Officials in Washington County said they were still calculating the number of people who stayed in their shelters Thursday, but that number could be similar to the 58 they served Wednesday night. With harsh temperatures continuing to ravage the area, Multnomah County officials are desperately seeking more volunteers to help keep the warming centers open Friday. Wind chills could make the air temperature feel like zero degrees, forecasters said. The National Weather Service is warning of frostbite and hypothermia dangers for anyone who is outside too long. “Our most urgent need is for people to commit to daytime hour shelter shifts today … especially at Friendly House, Charles Jordan Community Center and Salvation Army,” the county said in a statement. Volunteers are required to wear face coverings and closed-toe shoes, and the county recommends they dress for cold weather. People can visit to sign up to volunteer. Volunteers are asked to sign up for a two-hour online training before their shift, if possible. People can register for the training . Many local organizations are also looking for donations of coats, blankets, tents, tarps, sleeping bags, cold weather gear and socks. For information on where to bring donations, visit the . Already, the Multnomah County Medical Examiner is investigating one possible hypothermia-related death that occurred Wednesday night. An update on additional deaths in Multnomah County has not been provided but officials in Washington and Clackamas counties said no cold weather-related deaths have been reported so far. Multnomah County opened more warming centers Friday morning to keep up with the high demand. People can seek shelter during the day and Friday night at: The Lloyd Center mall will also serve as a daytime warming center in Portland. Pets are welcome at the shelters and people can ride TriMet for free through noon Saturday if they are heading to a warming shelter or any other place to keep warm. However, due to icy road conditions, delays are expected. More than 500 people were transported to a shelter Thursday night via ride shares, county and city vehicles and TriMet, officials said. In Clackamas County, 35% more people were served Thursday night than the night before, said Emily Roots, county spokesperson. Some of the county’s shelters have already extended their hours: Service animals are welcome at Father’s Heart Street Ministry. At Molalla Hope Center and Zoar Lutheran Church, dinner will be provided and leashed dogs and small pets in carriers are welcome. Washington County officials have not yet said how many people stayed in their severe weather shelters Thursday night, though at least one of their warming centers was at capacity Wednesday night. Washington County’s two severe weather shelters will remain open 24 hours a day until the extreme weather ends. The sites are at: If someone sees people outside during the dangerous weather and their life appears to be in danger, they are advised to call 911. If they see people who are not dressed warmly enough, people can call the non-emergency line at 503-823-3333 to request a welfare check. .