Tall trees uprooted, tossed, and broken in half like twigs. Main park trails piled head-high with a tangle of debris, mile upon mile. And an entire forest changed: these are the widespread impacts that resource managers at Great Smoky Mountains National Park discovered following a tornado and violent storms that ripped across the park April 27, 2011.
The tornado—a Category 4, packing winds from 166 to 200 mph—shut off recreational access to large areas of the park’s northwest corner for months. But the storm’s changes to park forests may last for decades or even centuries to come. If you’ve ever been to the western side of the Smokies, you would recognize the drier soils and towering, fluffy-crowned pines of its higher, sunny ridges. This is a forest type that thrives with regular fire: its yellow pines and chestnut oaks, among other species, have thick gnarled bark to withstand regular scorching, and its trees grow best in an uncrowded, fire-cleared understory.
Following decades of fire exclusion in National Parks and Forests, these xeric, or dry habitat, pine-oak forests have been disappearing. To restore them, fire managers began using controlled burns, and over the past decade have planned and set low-intensity, controlled fires in special long-term burn units. The relatively low-temperature fires smolder and creep along the ground, drawing down piled debris, undergrowth, and encroaching plants without harming large, fire-adapted trees. The result is a healthier native forest.