Much of the western U.S. has been in the grip of an unrelenting drought since early 2020. The dryness has coincided with record-breaking wildfires, intense and long-lasting heat waves, low stream flows and dwindling water supplies in reservoirs that millions of people across the region rely on.

Heading into summer, the outlook is pretty grim. The National Weather Service’s latest seasonal outlook, issued May 19, 2022, described drought persisting across most of the West and parts of the Great Plains.

One driver of the Western drought has been persistent La Niña conditions in the tropical Pacific since the summer of 2020. During La Niña, cooler tropical Pacific waters help nudge the jet stream northward. That tends to bring fewer storms to the southern tier of the U.S. and produce pronounced drought impacts in the Southwest.

The other and perhaps more important part of the story is the hotter and thirstier atmosphere, caused by a rapidly warming climate.

As a climate scientist, I’ve watched how climate change is making drought conditions increasingly worse – particularly in the western and central U.S. The last two years have been more than 2 degrees Fahrenheit (1.1 Celsius) warmer than normal in these regions. Large swaths of the Southwest have been even hotter, with temperatures more than 3 F (1.7 C) higher. Studies suggest the Southwest’s ongoing 20-year drought is the most severe in at least 1,200 years, based on how dry the soils are.

A hotter atmosphere sucks more moisture from the soil

A thristier atmosphere tends to extract more water out of the land. It exacerbates evaporative stress on the land, particularly when a region is experiencing below-normal precipitation. High evaporative stress can rapidly deplete soil moisture and lead to hotter temperatures, as the evaporative cooling effect is diminished. All this creates hydroclimatic stress for plants, causing restricted growth, drying and even death.

As a consequence of a warming climate, the U.S. Southwest has seen an 8% increase in this evaporative demand since the 1980s. This trend is generally happening across other parts of the country.

The thistier atmosphere is turning what would otherwise be near-normal or moderately dry conditions into droughts that are more severe or extreme. As the climate heats up further, the increasing atmospheric thirst will continue to intensify drought stress, with consequences for water availability, long-lasting and intense heat stress, and large-scale ecosystem transformation.

Climate models project ominous prospects of a more arid climate and more severe droughts in the Southwest and southern Great Plains in the coming decades.

In addition to direct impacts of increasing temperatures on future droughts, these regions are also expected to see fewer storms and more days without precipitation. Climate models consistently project a poleward shift in the midlatitude storm tracks during this century as the planet heats up, which is expected to result in fewer storms in the southern tier of the country.

Expect flash droughts even in wetter areas

The changing nature of droughts is a concern even in parts of the U.S. that are expected to have a net increase in annual precipitation during the 21st century. In a hotter future, because of the high evaporative demand on the land, prolonged periods with weeks to months of below normal precipitation in these areas can lead to significant drought, even if the overall trend is for more precipitation.

Large parts of the northern Plains, for example, have seen precipitation increase by 10% or more in the last three decades. However, the region is not immune to severe drought conditions in a hotter climate.

At the tail end of what was the wettest decade on record in the region, the northern Plains experienced an intense flash drought in the summer of 2017 that resulted in agricultural losses in excess of $2.6 billion and wildfires across millions of acres. Record evaporative demand contributed to the severity of the flash drought, in addition to a severe short-term precipitation deficit. A flash drought is a drought that intensifies rapidly over a period of a few weeks and often catches forecasters by surprise. The likelihood of flash droughts that can cause severe impacts to agriculture and ecosystems and promote large wildfires is expected to increase with a warmer and thirstier atmosphere.

Flash droughts are also emerging as a growing concern in the Northeast. In 2020, much of New England experienced an extreme hydrologic drought, with low stream flows and groundwater levels and widespread crop losses between May and September. Aided by very warm and dry atmospheric conditions, the drought developed very rapidly over that period from what had been above-normal wet conditions.

As humanity enters a hotter future, prolonged periods of weeks to months of below-normal precipitation are going to be of a greater concern almost everywhere.

Heading into unfamiliar territory

Other forms of droughts are also emerging.

Atmospheric heating is causing snow droughts as more precipitation falls as rain rather than snow and snow melts earlier. Shorter snow seasons and longer growing seasons because of warmer temperatures are changing the timing of ecological responses.

Land is greening up earlier and causing an earlier loss of water from the land surface through evapotranspiration – the loss of water from plants and soil. This could result in drier soils in the latter half of the growing season. As a result, parts of the central and western U.S. could see both increased greening and drying in the future that are seasonally separated across the growing season.

With a rapidly changing climate, we are entering unfamiliar territory. The world will need new ways to better anticipate future droughts that could transform natural and human systems.

Imtiaz Rangwala, Research Scientist in Climate, Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder

This article is republished from The Conversation under a Creative Commons license. Read the original article.

In the United States, children are more likely to experience poverty than people over 18.

In 2020, about 1 in 6 kids, 16% of all children, were living in families with incomes below the official poverty line – an income threshold the government set that year at about US$26,500 for a family of four. Only 10% of Americans ages 18 to 64 and 9% of those 65 and up were experiencing poverty, according to the most recent data available.

The official child poverty rate ticks down when the economy grows and up during downturns. It stood at 17% in 1967 – just about the same as in 2020. In many recent years the rate hovered even higher – around 20%.

Another way to measure poverty

Researchers calculate the official poverty rate by adding up a household’s income and comparing it with a threshold of what is needed to survive.

The government has calculated this rate the same way since the 1960s.

One of its shortcomings is that it excludes several sources of income, including tax credits and the Supplemental Nutrition Assistance Program, which are intended to reduce poverty.

In 2011, the government began to calculate an alternative metric: the supplemental poverty measure. It includes SNAP and tax credits. It also uses thresholds based on the cost of living in different areas of the country. For a family of four, this threshold currently ranges from $24,000 to $35,000, depending on where a family lives and whether they own or rent housing.

According to this alternative measure, 10% of children were living in poverty in 2020, the lowest rate ever recorded.

Depending on which measure you use, either 7 million or 11.7 million U.S. children lived in poverty in 2020.

By both metrics, poverty is higher for children of color. The official poverty rate for Black children stood at 26%, and 23% for Hispanic children, while for white, non-Hispanic children it was 10%.

Before and after 2020

Both child poverty rates had been declining before the COVID-19 pandemic.

The official rate dipped to 14% in 2019 from 21% five years earlier. It shot back up to 16% in 2020, when the pandemic compounded economic hardships for many families.

The supplemental measure of child poverty tells a more complete story.

Steps the government took during the pandemic, including its series of economic impact payments, the child tax credit expansion and a boost in SNAP benefits, led the supplemental child poverty rate to keep declining even during the economic crisis.

The government will release its child poverty data for 2022 in September 2023. But some researchers at Columbia University have monthly data suggesting that child poverty rose steeply after the expiration of the pandemic-era programs. They estimate that 3.7 million more children were living in poverty in January 2022 than in December 2021 because of the expiration of the child tax credit expansion.

Callie Freitag, Ph.D. Candidate in Public Policy and Governance, University of Washington and Heather D. Hill, Professor of Public Policy and Governance, University of Washington

This article is republished from The Conversation under a Creative Commons license. Read the original article.