( CNN ) -- Crews battling the Arizona wildfire that killed 19 firefighters made significant progress Thursday , moving within sight of fully corralling the blaze , authorities announced . Despite still gusty winds and temperatures in the 90s , the Yarnell Hill Fire near Prescott was 80 % contained as of Thursday evening , according to Inciweb , a federal website that disseminates information from agencies like the U.S. Forest Service and Bureau of Land Management . That 's a significant upgrade from earlier in the day , when it was 45 % contained . `` Praise the Lord ! '' wrote one person on an official Facebook page dedicated to the fire . The Yavapai County Sheriff 's Department has lifted an evacuation order for residents of Peeples Valley , according to Inciweb . Those in the community of Yarnell , which is about 75 miles northwest of Phoenix , still face a mandatory evacuation order . On average , workers are putting in 13- or 14-hour shifts but are able to sleep , shower and eat when they need to , U.S. Forest Service spokeswoman Suzanne Flory had said . `` We 're very safety conscious and we 're very careful about not overstressing or overworking anybody and making sure they get that rest that they need . '' There are four helicopters battling the blaze , she told reporters . Temperatures reached into the 90s on Thursday , with winds gusting in excess of 20 mph . It should get a little cooler in the coming days , with the thermostat peaking in the 80s and winds expected to be a little calmer . There 's also a chance of showers and thunderstorms for the coming week , at least . Rain would be welcome in many ways , though thunderstorms also bring the possibility of lightning that could spark more fires . And wet conditions could also hamper efforts because people could get stuck in mud , explained National Weather Service meteorologist Jim Wallman . The fallen firefighters : Who they where . The Maricopa County medical examiner 's office performed autopsies and said Thursday that the causes of death for all 19 were `` fire-related injuries . '' The manners of death were described for each as an `` accident . '' Plans to remember the 19 firefighters include a memorial service scheduled for Tuesday . Vice President Joe Biden will attend the service in Arizona , a senior administration official told CNN on Friday . On Wednesday nearly 600 firefighters and support workers assigned to the fire took a brief break from their hard work to observe a moment of silence in honor of the 19 members of the Granite Mountain Hotshots , who died Sunday when the fire took a sudden , unexpected turn . Lookout warned team before fire killed 19 . The pause coincided with the movement of a convoy of vehicles driven to the fire by the Granite Mountain team . The vehicles are being returned to Prescott , where they were based . To start Wednesday 's moment of silence , a loud alert tone sounded on firefighters ' radios and an unidentified fire team commander announced , `` As the crew carriers for the Granite Mountain hot shots leaves the Yarnell Hills fire and begin their journey home , all personnel in the incident will observe an operational pause , in observance of our fallen comrades . '' How to help the families . The first official service to remember the lost firefighters will be held Tuesday in Prescott Valley . A ceremony is expected to begin at 11 a.m. local time at Tim 's Toyota Center , according to CNN affiliate KPHO . The bodies are being guarded by members of the Phoenix Fire Honor Guard at the medical examiner 's office in downtown Phoenix , the affiliate reported Thursday . Remembering those who were killed . Opinion : When heroes face down fire -- and fate . CNN 's Jackie Castillo and Lesa Jansen contributed to this report .
NEW : Vice President Joe Biden to attend memorial service Tuesday , senior administration official says . The medical examiner 's office issues causes and manners of death . Workers were putting in 13- or 14-hour shifts to fight the Yarnell Hill fire . The temperature should cool , and winds should calm somewhat this week .