Increased frequency of and population exposure to extreme heat index days in the United States during the 21st century

Increased frequency of and population exposure to extreme heat index days in the United States during the 21st century

SOURCE: IOP Science and Think Progress DATE: July 16, 2019 SNIP: A peer-reviewed study published this week warns that if we don’t reverse emissions trends quickly and sharply, we will see a rise in unprecedented heat waves that will “break” the National Weather Service’s heat index scale. The researchers warn we will face extended scorchers more brutal than the United States has ever experienced before. In several decades, parts of Florida and Texas could experience a heat index for five or more months per year exceeding 100 degrees, “with most of these days even surpassing 105 degrees.” The administration’s own studies confirm this. Typical five-day heat waves in the U.S. will be 12 degrees warmer by mid-century alone, according to the U.S. National Climate Assessment (NCA), which the White House itself reviewed and approved last November. From the report: By mid-21st century (2036–2065) under both emissions scenarios, the annual numbers of days with heat indices exceeding 37.8 °C (100 °F) and 40.6 °C (105 °F) are projected to double and triple, respectively, compared to a 1971–2000 baseline. In this timeframe, more than 25% of the US by area would experience no analog conditions an average of once or more annually and the mean duration of the longest extreme heat index event in an average year would be approximately double that of the historical baseline. By late century (2070–2099) with a high emissions scenario, there are four-fold and eight-fold increases from late 20th century conditions in the annual numbers of days with heat indices exceeding 37.8 °C and 40.6 °C, respectively; 63% of the country would experience no analog conditions...
Climate Change Is Having a Major Impact on Global Health

Climate Change Is Having a Major Impact on Global Health

SOURCE: Scientific American DATE: March 1, 2019 SNIP: Warming temperatures do not only threaten lives directly. They also cause billions of hours of lost labor, enhance conditions for the spread of infectious diseases and reduce crop yields, according to a recent report. The report, published last December in the Lancet, represents the latest findings of the Lancet Countdown—a coalition of international research organizations collaborating with the World Health Organization and the World Meteorological Organization. The group tracks the health impacts of—and government responses to—climate change. “It affects everyone around the world—every single person, every single population. No country is immune,” says Nick Watts, executive director of the Lancet Countdown and one of many co-authors of the report. “We’ve been seeing these impacts for some time now.” The report found that millions of people worldwide are vulnerable to heat-related disease and death and that populations in Europe and the eastern Mediterranean are especially susceptible—most likely because they have more elderly people living in urban areas. Adults older than 65 are particularly at risk, as are those with chronic illnesses such as heart disease or diabetes. Places where humans tend to live are exposed to an average temperature change that is more than twice the global average—0.8 versus 0.3 degree Celsius (graphic). There were 157 million more “heat wave exposure events” (one heat wave experienced by one person) in 2017 than in 2000. Compared with 1986 to 2005, each person was exposed to, on average, 1.4 more days of heat wave per year from 2000 to 2017. That may not seem like a lot, but as Watts notes, “someone who is...
Australia’s extreme heat is sign of things to come, scientists warn

Australia’s extreme heat is sign of things to come, scientists warn

SOURCE: The Guardian DATE: February 1, 2019 SNIP: Australia sweltered through the hottest month in its history in January, spurring mass deaths of fish, fire warnings and concerns among climate scientists that extreme heat is hitting faster and harder than anticipated. For the first time since records began, the country’s mean temperature in January exceeded 30C (86F), according to the Bureau of Meteorology (BoM), which said daily extremes – in some places just short of 50C – were unprecedented. “There’s been so many records it’s really hard to count,” said Andrew Watkins, a senior climatologist at BoM, after January registered Australia’s warmest month for mean, maximum and minimum temperatures. This followed the country’s warmest December on record, with heatwaves in every Australian state and territory. Climate change is the long-term driver. “The warming trend which has seen Australian temperatures increase by more than 1C in the last 100 years also contributed to the unusually warm conditions,” Watkins said. The bureau’s monthly report said the heatwaves were unprecedented in their scale and duration. The highest temperatures of the month were recorded in Augusta on the south-west coast, where thermometers registered 49.5C , but the most relentless heat was in Birdsville, Queensland, which endured 10 consecutive days above...
Queensland flying fox species decimated by record heatwave

Queensland flying fox species decimated by record heatwave

SOURCE: The Guardian DATE: November 29, 2018 SNIP: Thousands of threatened flying foxes have dropped dead due to heat stress brought on by extreme temperatures in far north Queensland this week. Conservationists and wildlife volunteers estimate more than 4,000 have perished this week during the record heatwave, which has seen temperatures in Cairns reach all-time highs of 42.6C. The species of flying fox affected is the spectacled flying fox, an endemic Queensland species found in north Queensland. It’s currently listed as vulnerable under national environment laws but conservationists have been pushing to have the species up-listed to endangered because of declines in the population. Volunteers found 3,000 dead bats and 54 live bats needing care at one site in Edmonton alone. “What’s scary about this one is the spectacled flying fox has been hit,” he said. “As far as we know, they’ve never suffered heat deaths before. This is an unprecedented and shocking heat-stress event, with climate change seeing threatened species never before affected dropping by the thousands and dependent pups left...
Watery heatwave cooks the Gulf of Maine

Watery heatwave cooks the Gulf of Maine

SOURCE: NASA DATE: September 12, 2018 SNIP: Most of us are familiar with heat waves on land, but in a warming world, heat waves are starting to become common in the ocean, too. One basin in particular, the normally cool Gulf of Maine in the Northwest Atlantic Ocean, has seen several heat waves in recent years and has spent most of 2018 with unusually warm water temperatures. On August 8, 2018, scientists using satellite data and sea-based sensors measured the second warmest sea surface temperatures ever observed in the Gulf of Maine. Average water temperatures reached 20.52 degrees Celsius (68.93 degrees Fahrenheit) that day, just 0.03°C (0.05°F) below the record set in 2012. The map on this page shows sea surface temperature anomalies as compiled by NOAA’s Coral Reef Watch, which blends observations from the Suomi NPP, MTSAT, Meteosat, and GOES satellites and from computer models. Shades of red and blue indicate how much water temperatures were above or below the long-term average for the region. The map [on this post] shows conditions on August 8, the near-record setting day. The heatwave of 2018 fits with a much longer trend in the region, which is among the fastest-warming parts of the global ocean. In the past three decades, the Gulf of Maine has warmed by 0.06°C (0.11°F) per year, three times faster than the global average. Over the past 15 years, the basin has warmed at seven times the global average. The Gulf has warmed faster than 99 percent of the global ocean. “Climate change is likely contributing to the circulation changes through melting in Greenland and Arctic, as...