A Northern California wildfire continued its destructive march on Monday towards a grove of ancient sequoia trees in Yosemite National Park as the Washburn Fire grew to more than 2,300 acres.
Using a four-foot-tall sprinkler system intended to ward off damaging flames and maintain much-needed moisture in the air, firefighters worked to create a perimeter around some 500 mature sequoias in the park’s Mariposa Grove.
The Washburn Fire, on the western flank of the Sierra Nevada, was 25% contained by Monday evening. Nearby Wawona remained under threat as high temperatures scorched the region.
There have been no reports of severe damage to any named trees, including the 3,000-year-old Grizzly Giant.
“Right now the sprinklers are doing a lot of good,” said United States Forest Service spokesman Stanley Bercovitz.
Asked if firefighters had made protecting certain trees a priority, Bercovitz simply said: “That’s like asking who’s your favorite child.”
Mariposa Grove and Yosemite Valley have been protected since President Abraham Lincoln signed legislation in 1864. The grove has a long history of prescribed burning, which greatly reduces the negative impacts of high-severity fires, the National Park Service said in a statement.
The giant sequoias, native in only about 70 groves spread along the western slope of the Sierra Nevada, were once considered impervious to flames but have become increasingly vulnerable as wildfires, fueled by a buildup of undergrowth from a century of fire suppression and the impact of drought exacerbated by climate change, have become more intense and destructive.
Lightning-sparked wildfires over the past two years have killed up to a fifth of the estimated 75,000 large sequoias, which are a major draw for tourists.
“Fortunately there has not been any erratic winds that have affected fire behavior,” said fire information officer Marc Peebles. “We do have the high pressure that’s over the top of the fire which is causing the increase in temperatures. However, we do get a decent amount of humidity at night which moderates fire behavior which allows our night shift firefighters to do good work.”
The area in the southern portion of Yosemite was closed to visitors but the rest of the national park remained open.
A heat advisory was issued for the Central Valley sprawling below the Sierra while up in the fire area, a high temperature of 88 degrees was forecast for the village of Wawona, where hundreds tourists and residents were forced to evacuate last Friday.
There was no obvious natural spark for the fire that broke out Thursday next to the park’s Washburn Trail. Smoke was reported by visitors walking in the grove.
A fierce windstorm ripped through the grove more than a year ago and toppled 15 giant sequoias, along with countless other trees.
The downed trees, along with massive numbers of pines killed by bark beetles, provided ample fuel for the flames.
So far in 2022, more than 35,000 wildfires have burned nearly 4.7 million acres in the U.S., according to the National Interagency Fire Center, well above average for both wildfires and acres burned.
Source: | This article originally belongs to Nbcnews.com
