Technology Wildfires & extreme weather: It's not coincidence, it's climate change
Wildfires are blazing in Colorado and California. Operation Legend nets 1,000 arrests, including 90 murder suspects. It's Wednesday's news.It's Ashley with the news to know.
Right on the heels of arguably the West Coast's most in modern history comes the most ferocious flare-up of catastrophic wildfires in recent memory. Meanwhile, just a few hundred miles east, a over just 18 hours in Wyoming and Colorado was accompanied by an extremely rare late-summer dumping of up to 2 feet of .
It's not coincidence, it's climate change.
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These kinds of , happening often at the same time, are exactly what scientists have been warning about for decades. While extreme weather is a part of the natural cycle, the recent uptick in the ferocity and frequency of these extremes, scientists say, is evidence of an acceleration of climate impacts, some of which were underestimated by climate computer models.
"This is yet another example of where uncertainty is not our friend," says Michael Mann, distinguished professor of atmospheric science at Penn State. "As we learn more, we are finding that many climate change impacts, including these sorts of extreme weather events, are playing out faster and with greater magnitude than our models predicted.
At least 3 people killed in Northern California wildfires
SANTA CRUZ, Calif. (AP) — Dozens of wildfires raging throughout Northern California have now claimed at least three lives and threaten tens of thousands of homes, authorities said Thursday. The death of a resident in Solano County, in the northeastern San Francisco Bay Area, was reported Thursday by Sheriff Thomas A. Ferrara, although he didn't have any additional details. A Pacific Gas & Electric utility worker assisting with advance clearing was found dead Wednesday in a vehicle in the Vacaville area between San Francisco and Sacramento. A pilot on a water-dropping mission in central California also died Wednesday when his helicopter crashed. Gov.
As historic wildfires continue to rage across the West Coast, CBSN explores the climate crisis TONIGHT at 8p ET on, CBS News' 24/7 streaming news service. Download the on your phone or connected TV to watch "A Climate in Crisis."
On September 9, NOAA released its latest and an extraordinary ., which finds that just during the month of August the U.S. was hit by four different billion-dollar disasters: two hurricanes,
Just one such extreme event can strain emergency resources — a situation West Coast firefighters find themselves in now. However, in two dramatic cases this summer, the nation was hit simultaneously with concurrent catastrophes, some of which had no precedent in modern history. It's a concept scientists call, and it is necessary to factor these confluences into future projections to properly estimate risk, response and resources.
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In mid-August the West suffered through an extended heat wave which saw Death Valley surge to , the hottest temperature ever reliably measured on Earth. The tinderbox conditions caused by the heat, along with a rare lightning outbreak, sparked the first round of major wildfires in California this season, escalating into three of the four largest fires in state history. At about the same time a powerful caused billions of dollars in damage in Iowa and Illinois, and plowed into the Gulf Coast of Louisiana as a Category 4 with 150 mph winds and 16 feet of storm surge.
Just a few weeks later, and here we are again. Over Labor Day weekend California experienced an , with the southern part of the state hitting 121 degrees west of the mountains for the first time in record-keeping history. Predictably, due to the severe heating and drying, and then went into overdrive as a wicked early-season cold front — which also delivered heavy snow to the Rockies — brought a wind event through the mountains and valleys of the intermountain west.
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In Washington state, an estimated across the state in a single day, more than the total in each of the last 12 fire seasons. California has seen a record 3.3 million acres burn so far this year — roughly 5 times the normal for an entire season (typically July through November), and 10 times the normal year to date.
If it were just this fire season, one could chalk the extremity up to mere coincidence. But scientists say this is part of an ongoing upward trend, made clear by the data and well understood by science.
"There is little doubt that we're witnessing an acceleration of fire activity in the West — be it in terms of burned area, number of large fires, fire growth, and of course direct and indirect impacts to people," explains Dr. John Abatzoglou, climate professor at the University of California Merced.
The acceleration has been dramatic. Fire season is now two to three months longer than it was just a few decades ago across much of the West. Since the 1970s, California has experienced a five-fold increase in annual burned area and an eight-fold increase in summer forest fire extent. At least 17 of California's top 20have burned since 2000.
Abatzoglou makes clear that there are many factors — not just climate change — that contribute to the escalation of fire activity. These include the increased settlement of people in fire-prone lands and a legacy of fire suppression in many lower-elevation forests, which led to years of heavy growth of trees and brush.
For Republicans, the Fires Change Nothing
Climate change’s destructive power represents an irresistible force for action. But it’s colliding with an immovable object.“Yes, absolutely,” she told me earlier this week, when I asked her whether this year’s fires are the most tangible danger to California that she’s seen from climate change. “It’s not suddenly going to reverse itself … to years when there’s no fire season, or it’s not going to happen until October. The changes are going to be real, and they are going to be long-lasting.
"We can focus on the bad fortune of the around the San Francisco Bay Area, or the multitude of that materialized in large wildfires, but the confluence of long-term and short-term environmental factors set the table for the 2020 fire season," he said.
In other words, though climate change does not cause the heat waves or fires, it sets the stage so that when conditions are ripe, like the summer and fall of 2020, heat waves are more intense and fires burn more fiercely.
This and dry in the West. According to NOAA, Arizona, California, Colorado, Nevada, New Mexico and Utah each had their on record. Research has found that heat waves are now larger, getting more intense and lasting longer than decades ago. Specifically in California, extreme heat waves — like the ones of recent weeks — are now Fahrenheit warmer due to climate change. By 2080, that same study finds such heat waves will intensify by another 3 to 5 degrees.
NOAA also reports that the same general area in the West experienced one of its driest Augusts on record. This short-term dry and hot pattern is mainly due to natural cycles in weather, and from season to season has the biggest impact on the amount of area burned because it determines how dry the forests and brush are.
"Across the Western U.S. forests, we find that climatic measures of fuel dryness explain about ¾ of the year-to-year variability in the burned area — highlighting that climate very strongly enables big fire seasons in warm-dry summers and inhibits widespread fire activity in cool-wet summers," explains Abatzoglou.
But over the long term, human-caused climate change has been gradually drying out the atmosphere and the fuel. "The observed changes in fuel dryness [plus the] number of days of high fire danger have been particularly stark in the American West over the past half-century," says Abatzoglou.
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Since the 1970s the warm season in the West has heated up by 2 to 3 degrees Fahrenheit. This extra heat has increased the evaporation of moisture from the surface. While atmospheric moisture has also increased some, it has not increased nearly as fast as the temperature. That has caused a long-term "moisture deficit" and has accelerated the rate of foliage drying. This is part of the reason why, according to research, the West has entered into one of the worst in the past 1,200 years.
A burn out of control, the deficit is at record low levels in the majority of the Western U.S., co-authored by Abatzoglou, found a direct link with nearly all of the increase in summer forest-fire area during the period from 1972–2018 driven by the increased moisture deficit. To illustrate just how impactful the moisture deficit is, right now, as
Another from this spring found that the frequency of autumn days with extreme fire weather conditions has more than doubled since the 1980s, fueled by a combination of less rainfall and warmer temperatures.
But many scientists believe that there is more at play contributing to this extreme weather than simply the direct effects of warming and drying. One of those mechanisms is the indirect impacts of global warming on the most influential weather-maker on day-to-day conditions: the jet stream.
The speed and orientation of the jet stream — a river of fast-moving air currents in the atmosphere — determines the track, intensity and forward speed of most storm systems and also how cold or hot the weather is. The attributes of the jet stream at any given moment are determined largely by the placement of hot and cold air masses and the strength of the gradient between them. Because the Arctic has been warming at three times the rate of the rest of the globe, climate scientists know human-caused climate change is throwing the jet stream off-kilter. But how and to what extent is not totally understood.
A number of climate scientists believe that a warmer Arctic is slowing down the jet stream during certain times of year, resulting in a more and is also the kind of pattern we have right now, which is causing record low temperatures and extremely early season snow in the Rockies and Plains. A wavy jet stream is a normal part of nature, but climate change may be making it more amplified, resulting in more extremes.. As shown below, a wavy jet stream can catapult warm air northward into the Arctic and drive cold air far southward. This is exactly what happened during the catastrophic
"I think it's a triple whammy — heat and drought, which are favored by climate change, and the extra added ingredient is the slower, wavier jet stream," explains Mann. But he says the wavier jet streamby current models, thus they underestimate the extremity of weather events enhanced by climate change.
As a result, when scientists dig into the causes of an extreme event, Mann says the studies underestimate the influence of human-caused climate change. "So if anything, climate attribution studies are likely to under-attribute the role that climate change is playing with these persistent extreme weather events," he said.
As for future fire seasons, Abatzoglou says we should expect extreme fires seasons like 2020's to become the rule rather than the exception.
"While the extent of the ongoing fire siege is beyond what most have seen in the West, the alignment of ingredients for such fire seasons is becoming more favorable as a result of climate change and land-use practices," he said. "We should expect, adapt, and prepare for similar years moving forward."
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Joe Biden addressed the devastating wildfires affecting the western United States in a speech Monday warning of the growing threat of climate change. "If you give a climate arsonist four more years in the White House, why would anyone be surprised if we have more of America ablaze? If you give a climate denier four more years in the White House, why would anyone be surprised when more of America is underwater?" Biden said in prepared remarks.