Tornadoes and Fire
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 this spring.
The tornado—a Category 4, packing winds from 166 to 200 mph—has shut off recreational access to large areas of the park’s northwest corner for perhaps 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.
In the northwestern area of the park, the first stages of fire reintroduction had been going well. Pitch and Virginia pines were maturing, and would soon drop seeds to sprout in the newly opened, sun-drenched habitat. The tornado, however, changed everything. To a forest, a tornado is neither good nor bad: it is a natural weather event. To park managers, however, a tornado presents many different types of challenges. Foremost among these is the ability to fulfill the National Park Service’s mission to preserve and protect ecological systems while providing for the enjoyment of visitors. In the Smokies, massive amounts of human-power, in the form of trail crews from around the country, will soon restore visitor access to trails. Long-term restoration of this area’s native forest communities is harder to put back on track.
The future of fire
Watch a video about the tornado (leaves NPS page; goes to Great Smoky Mountains Association website).
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