A wind-whipped wildfire in a canyon near Sedona now is estimated at 7 square miles and windy conditions have grounded air tankers that were fighting the blaze in Northern Arizona.

Authorities warned about 3,200 residents between Sedona and Flagstaff that they need to be ready to evacuate if the fire makes another advance Wednesday.

Authorities say the so-called Slide Fire could reach up to 2,000 acres by nightfall. It's already forced the evacuation of resorts and campgrounds and sent choking plumes of smoke across the area.

There are no reports so far of injuries or structures burned since the fire began around 4 p.m. Tuesday.

Flagstaff-area authorities said evacuations ordered because of a wildfire burning in Oak Creek Canyon haven't expanded but that residents of two wooded residential areas south of Flagstaff should be prepared.

Coconino County and Coconino National Forest officials scheduled a Wednesday afternoon information meeting for residents of the Forest Highlands and Kachina Village subdivisions.

The meeting will be held at the Forest Highlands Fire Station south of Flagstaff.

The announcement of the meeting said it's prudent for residents of areas near the fire to be prepared to evacuate should the need arise.

However, it said no evacuation orders have been issued for areas outside of Oak Creek Canyon.

In the words of county spokesman Nathan Gonzales, "clearly we're not there yet."

Hundreds of firefighters poured into the area earlier.

Coconino National Forest officials said 200 firefighters are already assigned to the fire, including five Hotshot crews.

An additional 15 Hotshot crews are on order, as well as 10 additional firefighting crews plus dozens of fire engines.

The Slide Fire has forced the evacuations of 100 threatened businesses and homes in a 2-mile stretch north of the state park, and 15 people stayed at a shelter in Flagstaff.

There are no reports so far of injuries or structures burned. Slide Rock State Park is a popular recreation area because of its natural rock water slides.