Tucson (US), Jun 12 (AP) Hundreds of foothills homes on the outskirts of Tucson remained under an evacuation notice Friday as firefighters worked to keep a wildfire from moving downhill from canyons and ridges in mountains in a national forest.

Most of the western United States is experiencing extreme dryness or drought, creating challenging conditions for wildfire season, Bryan Henry, meteorologist with the National Interagency Fire Center, said in a recent fire season outlook.

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The Federal Emergency Management Agency granted Arizona's request for money to help fight the fire, officials said Thursday.

Fire officials said the fire's growth slowed overnight but that it remained a threat. Flames have been visible from Tucson at night, and smoke from the fire plumed over a suburb Friday morning.

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Pima County officials on Thursday issued an evacuation notice for approximately 300 homes in a area south of the Coronado National Forest, and numerous other residents were told to prepare to evacuate.

Over 400 firefighters aided by aircraft dropping water and retardant battled the week-old lightning-sparked fire that as of Friday had burned 11 square miles (29 square kilometers) of mostly brush and tall grass.

Sheriff's officials went door to door in neighbourhoods on Thursday to notify residences of the evacuation notice, which a sheriff's spokesman said Friday wasn't mandatory.

“People are not required to leave, however we are telling people we may not be able to come back and assist if things start to burn," said Deputy James Allerton.

Travis Mayberry, an operations section chief for the fire management team, said Friday much of the fire was burning in terrain too rugged for grounds crews to work safely, particularly if they needed to escape quickly.

”Ït's not a great place for us to put people in to safely work," he said. “Ït's just too steep."

Mayberry said crews continued to clear lines to keep the fire away from homes south of the forest and might set additional fires to burn vegetation to slow the wildfire by depriving it of potential fuel.

The fire, sparked June 5 by lightning, was only 10 per cent contained as of Friday morning, and Mayberry said increasing the containment figure would be a slow process and difficult because of the rugged terrain.

The dry, hot weather and the steep, rocky topography have been the main challenges in fighting the fire near Tucson, Jarrold said.

Temperatures have pushed past 100 degrees (38 Celsius) and the humidity was in single digits. (AP)

(The above story is verified and authored by Press Trust of India (PTI) staff. PTI, India’s premier news agency, employs more than 400 journalists and 500 stringers to cover almost every district and small town in India.. The views appearing in the above post do not reflect the opinions of LatestLY)