Fires have also spread in the neighboring states of Kansas, Texas and Colorado. She described him Wednesday as a hard-working man who "treated everybody with the utmost respect".
The amount of Kansas and Oklahoma in what's classified as modified or severe drought also has intensified, with the entire eastern half of Colorado in various degrees of drought, according to the Nebraska center, which tracks USA drought conditions weekly.
"These conditions will make it somewhat easier for firefighting efforts, but far from ideal", Storm Prediction Center forecast operations chief Bill Bunting told the Associated Press.
"Conditions are very unsafe today", said George Geissler, director of Oklahoma Forestry Services.
The Dumas Complex Fire, in Potter County near Amarillo, ignited amid humidity values in the single digits and winds gusting in excess of 50 miles per hour. New research published last month in the Proceedings of the National Academy of Sciences found that 84 percent of wildfires in the United States are caused by humans. This is possible because flying conditions are safer due to calmer winds.
The Kansas Highway Patrol says 39-year-old Corey Holt, of Oklahoma City, jackknifed Monday while trying to back up his tractor-trailer on highway 34 in Clark County because of poor visibility and dust from the fires. Horner says she can't yet provide a cost estimate of the fire damage.
Ducheneaux said three firefighters were reported injured in the Dumas Complex fire and four Texas residents were confirmed dead.
The fourth victim from Texas is Cade Koch (25).
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The fire that claimed Koch is the largest of the three, covering 492 square miles in the northeast Panhandle near the Oklahoma border.
In all, more than million acres of land have burned throughout the Plains. The Texas A&M Forest Service reported today that that fire is now 95% contained. A smaller fire to the west near Amarillo is fully contained.
Crews from Hoover, McLean, Groom, Wheeler County, Pampa, Gray County, Carson County, Donley County and Wheeler County were all called to the scene, as well as crews from the Texas A&M Forest Service and Department of Public Safety. No injuries were reported.
Ms Fallin's office said up to 465 square miles have burned in Beaver, Harper and Woodward counties in north-western Oklahoma and the Oklahoma Panhandle.
Sheriff Randy Henderson said the fire was fueling itself in Reno County.
She said 66 people from the area were in shelters Tuesday in Hutchinson, which is 40 miles northwest of Wichita, as crews continued fighting fires that started over the weekend.
Similar wildfires in Colorado burned 30,000 acres.
No deaths were recorded in Colorado, where more than 45 square miles burned.