Wet Bulb Temperature Soon to Become Leading Cause of Death


As our Abrupt Climate Change Catastrophe becomes more extreme the leading cause of death on the planet will be humans hitting their   Wet Bulb Temperature.

Robertscribbler has written about this phenomenon here:

Never-before-seen high temperatures and high humidity are resulting in thousands of heat injuries and hundreds of heat deaths across India. In some places, wet bulb readings appear to be approaching 35 C — a level of latent heat never endured by humans before fossil fuel burning forced global temperatures to rapidly warm. A reading widely-recognized as the limit of human physical endurance and one whose more frequent excession would commit the human race to enduring an increasing number of episodes of killing heat. A boundary that scientists like Dr. James Hansen warned would be exceeded if a human-forced warming of the world was not halted.’  Article continues.

Wet Bulb Near 35 C — Heatwave Mass Casualties Strike India Amidst Never-Before-Seen High Temperatures.’

Short cut to calculating Wet Bulb Temperature

“In a recent study with Matt Huber, we showed that it doesn’t take that many degrees of global warming to permit peak heat summertime heat stress to (occasionally) become unsurvivable, in many parts of the world that are currently highly populated.”

“We came to this conclusion by considering a meteorological quantity called the wet-bulb temperature. You measure this quantity with a normal thermometer that has a damp cloth covering the bulb. It is always lower than the usual or “dry-bulb” temperature; how much lower depends on the humidity. At 100% humidity (in a cloud or fog) they match. In Sydney and Melbourne, even during the hottest weather, the wet-bulb usually peaks in the low 20’s C. The highest values in the world are about 30-31C, during the worst heat/humidity events in India, the Amazon, and a few other very humid places.
Climate Change Research Centre (CCRC) – The University of New South Wales Sydney NSW  Australia, paper shared here:  ‘What is Wet Bulb temperature?


Activist, sailor, passionate about the earth. Brace for impact, based on the way the world is being operated and treated. Live every day as precious.

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Posted in Habitat, Rapid Climate Change, Warnings
18 comments on “Wet Bulb Temperature Soon to Become Leading Cause of Death
  1. Reblogged this on Move for Change and the Brooklyn Culture Jam and commented:
    ‘Wet bulb Temperature’ is probably a new phrase for many of you. It won’t be for much longer. We’re drifting into a superheated world where humans will die from being out of doors at the wrong time of day. And temperatures in wet bulb range are not friendly to human agriculture, either. Read and weep.

    Liked by 1 person

  2. bill says:

    My understanding of maximum survival wet bulb temperature is: Water vapour in the air cools the air, once that saturation of water vapour is 100% a certain temperature in despite of the water vapour cooling is not survivable. The wet bulb temp mentioned is 35c. Plse correct me if I’m mistaken!?

    Liked by 1 person

    • bill says:

      The main means of cooling is sweating which maintains survivable core temp and skin temp at 35c.Sweating enables temps of up to 45c+ to be survived. But high humidity makes sweating increasingly ineffective in its cooling function: the higher the humidity gets the more it imposes a heat load on the body like it blocks the shedding of heat from the body through sweating. Water vapour in the air therefore does not cool the temperatures?

      Liked by 1 person

  3. bill says:

    Found this tells how wet bulb temps and humidity can kill:
    What is clear is that to prevent our core temperature rising too high, our skin temperature must not exceed 35 °C for more than a few hours. In dry climates sweating will cool the skin sufficiently even in temperatures of 45 °C or more. But in humid climates where the air is nearly saturated with moisture, sweating makes little difference.

    So temperature alone is a very poor guide to what people can survive. A better indicator is the “wet-bulb temperature”. This is the temperature that a mercury thermometer wrapped in a wet cloth would record. It is a measure of both heat and humidity, and reflects the temperature you could lower your skin to by sweating.

    Even fit and healthy people couldn’t survive sustained wet-bulb temperatures above 35 °C, say Sherwood and Huber. This heat-stress limit applies even to people sitting naked in the shade next to a fan. Without air conditioning or access to cooler or less humid places, they will die.

    The claim that people cannot survive a wet-bulb temperature of 35 °C or more for long is reasonable, says Chris Byrne, an exercise physiologist who specialises in human thermoregulation at the University of Exeter, UK. “At any temperature above that, we switch from a state where we’re losing heat from the skin to the environment to one where the environment imposes a heat load through the skin,” he says. “There’s no doubt that if those conditions arise, you’re probably looking at a lethal situation for the vast majority of the population.”


    Basically the more humid the climate the less able sweating is to cool our skins down to 35c

    Liked by 1 person

  4. rabiddoomsayer says:

    Wet bulb of 35 °C is barely survivable if you are doing absolutely nothing. Try doing laps in a pool heated to 28 °C, it is just too damn hot.


  5. Kevin Hester says:

    We were sold the lie that 2C would be safe but for the thousands of people dying now from hitting their Wet Bulb temperature it patently isn’t safe at 1.6 C above baseline.

    Liked by 1 person

  6. Kevin Hester says:

    The best strategies to keep cool in a heatwave according to the Guardian.


  7. Kevin Hester says:

    Another great article from Andrew Freedman discussing the threat of heatwaves .
    Bare in mind that these are happening at 1.5C above baseline as we track to and beyond the IPCC worst case scenario of 6C.


  8. Kevin Hester says:

    “On Thursday, July 22nd, the temperature in Mitribah, Kuwait, set an all-time record for a temperature recorded outside of Death Valley, California, with a reading of 129.2 degrees, Fahrenheit (54 degrees, Celsius). The top temperature, 134 degrees Fahrenheit, was recorded in Death Valley in 1913. As Jeff Masters, Director of Meteorology at Weather Underground, notes in this article, “If verified, this would be Earth’s hottest temperature ever reliably measured outside of Death Valley…” Verification of temperature is performed by the official weather service in the country in which the temperature has occurred and can take anywhere from a few days to a few months.”


  9. Kevin Hester says:

    Excellent presentation on Wet Bulb Temperature from Paul Beckwith. Beware the clear skies on high wet bulb days folks, we will see more of them every day.


  10. Kevin Hester says:

    “Levermann of the Potsdam Institute said that as a climate scientist it’s interesting to see some of the projections about global warming impacts playing out in 2015.

    “There had been projections of the dying of coral reefs worldwide. They are becoming true now. You know the science, you trust the science, but to see this actually happening, it’s an interesting experience. If you look at the graphs, it shows that, at 1 degree of global warming, the death curve for corals is taking off. At 1.5 degrees, they’re practically all gone, and we’re right at that point,” he said.”


  11. Kevin Hester says:

    “In the Summer months, 84 inmates at the Price Daniel Unit, a medium-security prison four hours west of Dallas, share a 10-gallon cooler of water that’s kept locked in a common area. An inmate there can expect to receive one 8 oz. cup every four hours, according to Benny Hernandez, a man serving a 10-year sentence at the prison. The National Academy of Medicine recommends that adults drink about twice that amount under normal conditions and even more in hot climates. According to Hernandez, in the summer the temperature in his prison’s housing areas can reach an astonishing 140 degrees.
    “It routinely feels as if one’s sitting in a convection oven being slowly cooked alive.”


  12. Kevin Hester says:

    “When the mercury surges, people die. A heat wave in 2015 melted asphalt in New Delhi, India, and caused the deaths of at least 2,500 people.”


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Kevin Hester
Kevin Hester is currently living on Rakino Island, a small island in the Hauraki Gulf near Auckland New Zealand, monitoring the unravelling of the biosphere and planning Professor Guy McPherson’s November 2016 NZ and Australian speaking tour which is a follow up to the 2014 speaking tour. The Island has no grid tied electricity or reticulated water. I catch my own water from the roof and generate my electricity from the ample solar radiation on the island.
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