It is not intended to replace local or state information that might describe conditions more precisely for a particular region.Data for Figure 1 were obtained from the National Oceanic and Atmospheric Administration’s National Centers for Environmental Information, which maintains a large collection of climate data online at:
There are a number of ways climate change may contribute to drought. The impacts vary depending on the type, location, intensity, and duration of the drought. Drought can also be thought of as an extended imbalance between precipitation and evaporation.As average temperatures have risen because of climate change, the Earth’s water cycle has sped up through an increase in the rate of evaporation. For example, effects on agriculture can range from slowed plant growth to severe crop losses, while water supply impacts can range from lowered reservoir levels and dried-up streams to major water shortages. Thus, Figure 1 might understate the degree to which droughts are becoming more severe in some areas while other places receive more rain as a result of climate change.The U.S. Drought Monitor (Figure 2) offers a closer look at the percentage of the country that is affected by drought. Short Summary: Real-world data show drought in the United States has become less frequent and severe as the climate has modestly warmed. A value between -2 and -3 indicates moderate drought, -3 to -4 is severe drought, and -4 or below indicates extreme drought. Climate change increases the odds of worsening drought in many parts of the United States and the world in the decades ahead.
Major participants include the National Oceanic and Atmospheric Administration, the U.S. Department of Agriculture, and the National Drought Mitigation Center. The widespread drought across Victoria, New South Wales and Queensland—exacerbated by unusually high temperatures driven by climate change and evolving oceanic weather patterns—led to a noticeable increase in evaporationrates, which reducedsoil moisture and dried vegetation. Drought’s far-reaching impacts can ripple through communities, regions, watersheds, economies and ecosystems. Meteorologists generally define drought as a prolonged period of dry weather caused by a lack of precipitation that results in a serious water shortage for some activity, population, or ecological system. This index is relatively new, however, and thus too short-lived to be used for assessing long-term climate trends or exploring how recent observations compare with historical patterns. However, at the global scale, scientists are confident that relatively wet places, such as the tropics, and higher latitudes will get wetter, while relatively dry places in the subtropics (where most of the world’s deserts are located) will become drier.Recent U.S. droughts have been the most expansive in decades. An increase in evaporation makes more water available in the air for precipitation, but contributes to drying over some land areas, leaving less moisture in the soil. The data cover all 50 states plus Puerto Rico.Data source: National Drought Mitigation Center, 2016Experts update the U.S. Drought Monitor weekly and produce maps that illustrate current conditions as well as short- and long-term trends. Thus, as the climate continues to change, many areas are likely to experience increased precipitation (see the Drought conditions can negatively affect agriculture, water supplies, energy production, and many other aspects of society. At the peak of the 2012 drought, an astounding 81 percent of the contiguous United States was under at least abnormally dry conditions. An official website of the United States government.This indicator measures drought conditions of U.S. lands.This chart shows annual values of the Palmer Drought Severity Index, averaged over the entire area of the contiguous 48 states. With several decades of data collection, future versions of this indicator should be able to paint a more complete picture of trends over time.Overall, this indicator gives a broad overview of drought conditions in the United States. Climate change increases the odds of worsening drought in many parts of the United States and the world in the decades ahead. This fact sheet overviews strategies … The risk of wildfire is expected to grow across the United States due to reduced precipitation in some regions, and higher temperatures caused by climate change. Regions such as the There are a number of ways climate change may contribute to drought. Regions such as the U.S. Southwest are at particular risk. A grim consequence was the intensity of last summer’s bushfires. The thicker line is a nine-year weighted average.This chart shows the percentage of U.S. lands classified under drought conditions from 2000 through 2015. Wildfire has far-reaching impacts that can ripple through communities, regions, watersheds, and ecosystems. Prolonged droughts pose a particular threat to indigenous populations because of their economic and cultural dependence on land and water supplies. Warming and drought can threaten medicinal and culturally important plants and animals and can reduce water quality and availability, making tribal populations particularly vulnerable to waterborne illnesses.For a more detailed perspective on recent trends, Figure 2 shows a newer index called the Drought Monitor, which is based on several indices (including Palmer), along with additional factors such as snow water content, groundwater levels, reservoir storage, pasture/range conditions, and other impacts.
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