(Dickinson, ND) -- A wildfire in the North Unit of Theodore Roosevelt National Park is now tripled in size.  The blaze grew wildly Sunday after a day of record heat and dry, blustery conditions.  The North Unit fire has been called the Horse Pasture Fire, and crews worked through the night into yesterday to try to contain the blaze.  The fire now covers three-thousand acres and is 30-percent contained.  The park's visitor center is at risk from the flames.