Update 9:55 a.m.

ALAMOSA, Colo. (AP) -- Firefighters east of the Great Sand Dunes National Park in southern Colorado are battling a fire burning amid  high winds rugged terrain.

A second fire is burning across 170 acres on the Roan Plateau in western Colorado. A red flag warning has been issued for high fire danger across much of the central and southern parts of the state.

It's in effect from 11 a.m. to 9 p.m. No injuries or damage to structures has been reported from either fire.

The fire in Great Sand Dunes, known as the Medano Fire, grew to 4,713 acres by Sunday and was high in the Sangre de Cristo mountains on the east side of the park. The park has remained open during the fire.

(Copyright 2010 by The Associated Press. All Rights Reserved.)

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Original story

Crews fight 2 Colo. fires; other areas in danger

ALAMOSA, Colo. (AP) -- Crews are working to contain two wildfires in Colorado, and a red flag warning has been issued for high fire danger along the Front Range.

A fire in Great Sand Dunes National Park in southern Colorado has reached the top of the Sangre de Cristo Range and crossed the park boundary into national forest land.

The fire had burned 4,300 acres by Sunday.

A fire on the Roan Plateau in western Colorado has burned 150 acres.

Both blazes are believed to have been started by lightning.

The red flag warning covers the Interstate 25 corridor and areas to the west of the highway.

It is in effect between 11 a.m. and 9 p.m. Sunday.

Forecasters said gusty winds, low humidity and dry trees and vegetation make the areas vulnerable.

(Copyright 2010 by The Associated Press. All Rights Reserved.)