TECHNOLOGY

What is ‘weather of fire’ and why is it getting worse?


Temperature, humidity, and air তিনটি these three variables তাপ temperature, humidity, and wind – combine to make the map above visible when the fire-weather days are shown as percentage changes since 1973. Texas also looks very bad with a 284 percent increase in the southern edge of the state. And Central California has a similar problem, with 269 percent jumps on fire weather days. “The southwest was really coming up,” Weber said. “We can even see parts of Oklahoma and Kansas, some of these places where we traditionally don’t think of fire.”

But if you’re wondering why we don’t often hear of wildfires in the plains, as we do in California, Oregon, and Colorado, the reason “fire weather” just means the conditions for the fire are right – it doesn’t mean they don’t Of course it happens. “We are not talking about it Ignition Of fires, “Weber said.” We’re talking about how many days each year the weather elements have dominated the landscape for these high-risk fires that are really dangerous to fight, and really hard to fight. “

Atmospheric conditions are not the only variables that increase the likelihood of fire. In California and Oregon, for example, land management decisions play a role. These coastal areas are covered with forests that once burned regularly in a healthy way: lightning ignites relatively small fires that chew with a brush to clear new growth paths, but keep many mature trees alive. Historically, Native Americans strategically set fire to purposeful ecosystems. The landscape is burned Lots, But this means that it burned less intensely, since the burning brush did not have a chance to pile up in the burn.

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But over the last century or so, landowners have taken the opposite approach: firefighting, or anything else can immediately intervene in a residential area. This allows for the creation of dried plants – more fuel. And with more human communities living in the “wilderness urban interface”, where forest meets cities, people are setting more accidental fires, whether they are thrown out of cigarette butts through windows or due to electrical infrastructure defects.

The reason why fires are so much more severe in California than in Kansas or Oklahoma is this: there is more fuel stored here and more people are living on the brink of loss. To adapt, landowners in the western states needed more controlled burning, which would do brush-clearing work that used frequent, small forest fires.

Climate change has also forced some seemingly contradictory changes. Because a warm environment contains more water Amount While future rainfall may actually increase Length Wet of you is compressed. In California, rainfall usually comes in October and lasts until March. Now they are coming to the end of the year. “The dry season will extend to the normal wet season,” said Ruby Leung, a climate scientist at the Pacific Northwest National Laboratory. “When we look at future climate models, the fire season will be longer.”

Firefighters are already seeing this happen. California gets its biggest burnout in the fall, just before the torrential rains come, when the landscape without water landscapes is overly dry. It was accompanied by terrible monsoon winds that would drive huge fires. But now that the rainy season is very short and the terrain is dry for most of the year, the fire season comes even earlier. “What we’re seeing consistently and more regularly is that these fires are getting bigger and bigger,” said Isaac Sanchez, communications battalion chief of the California Department of Forests and Fire Protection. Told WIRED earlier this month. “So while August is turning around, turning into late July, we’re seeing this dry state that is absolutely the result of climate change.”



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