Alberta crews fighting the blaze will get logistical and personnel support from Ontario, Nova Scotia, Saskatchewan and British Columbia. Residents were told to be prepared to leave in case the situation worsened.
More than 650 people have registered at an emergency reception centre set up in Slave Lake, according to a statement on that town's website.
The town of High Level had been monitoring the progress of the fire over the last several days before the evacuation order was given on Monday afternoon.
Fire officials say winds continue to work in their favour, blowing smoke and fire away from the town.
On Monday, the premier, Forestry Minister Devin Dreeshen and Municipal Affairs Minister Kaycee Madu met with crews at the provincial operations centre who have been working around the clock.
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So far some 4,000 people from High Level alone have packed up and left their homes. Town employees said early Tuesday they have enough volunteers to fully staff the facility, and if additional help is needed, a call will be put out on social media. The airmass brings higher temperatures and very low relative humidity, combined with strong gusty winds that is creating a challenging environment for firefighters, ' a news release from the province said Monday about the High Level forest area. People should expect to be away for 72 hours.
McAteer said the evacuation is being co-ordinated in zones.
The community of Bushe River was also forced to evacuate, as ordered by Chief and Council of the Dene Tha First Nation.
The fire is one of four burning out of control in the province. "These factors have limited our ability to access the fire in any sort of real meaningful way", Mr. Elliot said. Early Monday, the highway reopened and the residents were allowed to return home, but were warned that they may need to flee again if the risk level rises. All evacuees must register at the High Level Arena (10101 105 Ave).
There are crews spraying down local buildings as protection should the fire reach the town.