(CNN)Three communities in Arizona have been asked to evacuate after a fire that crews have been working for days to contain jumped the containment line.
The Telegraph Fire continued to grow Tuesday, having burned more than 139,000 acres (218 square miles) with containment dropping to 59%, according to the interagency InciWeb site.
More than 1,000 people are fighting the Telegraph Fire, which is now merging with the neighboring Mescal Fire. Together, the two wildfires have burned more than 210,000 acres.
The communities of El Capitan, Dripping Springs and Beverly Hills were asked to evacuate immediately, according to the Telegraph Fire Information Facebook page.
The order was prompted after dry, windy conditions pushed smoke and flames through the area, eventually impacting state route 77.
As the blaze came down a hill toward the highway, crews worked to get ahead of it and keep it on one side, said Todd Abel, a fire operations chief with Central Arizona Fire.
"They were very successful until early this morning," Abel said. "It did get across 77. We did ... get aircraft in the air, and to try to catch this, what we call a slop over. It slopped over our containment line," Abel said Monday.
The fire ignited June 4 about 100 miles east of Phoenix. The cause is under investigation.
The weather in the coming days could make firefighters' jobs more difficult. The areas surrounding the fire are under excessive heat warnings until a heatwave eases Saturday, according to CNN meteorologist Michael Guy.
A monsoon will reach the area Tuesday, but along with the humidity that it will bring the area starved for rain, it could spark dry thunderstorms that fan existing flames, Guy said.