this post was submitted on 23 Aug 2023
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Climate Crisis, Biosphere & Societal Collapse

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Wet-bulb globe temperature (WBGT) warnings for the U.S. today (sopuli.xyz)
submitted 1 year ago* (last edited 1 year ago) by 0101010001110100@sopuli.xyz to c/collapse@sopuli.xyz
7 comments fedilink hide all child comments
 

Source: https://digital.mdl.nws.noaa.gov/?zoom=4&lat=37&lon=-96.5&layers=F000BTTTFTT®ion=0&element=8&mxmz=false&barbs=false&subl=TFFFFF&units=english&wunits=nautical&coords=latlon&tunits=localt

If you live in any of these areas, stay safe and healthy and remember to look out for your friends and neighbours who might be vulnerable.

edit: thanks for the correction Deme.
edit2: the temperatures were in Fahrenheit, I guess I switched to Celcius and took the screenshot before the change had loaded. The website seems to reeeeeally struggle with switching units, so I'm going to leave it in (properly marked) Fahrenheit. I don't know, I thought the National Weather Service was going straight to the source, but their website is really shit.

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[–] Deme@sopuli.xyz 14 points 1 year ago* (last edited 1 year ago)

*Wet-bulb globe temperature (WBGT) warnings.

Wet-bulb is a part of a measurement instrument (the wet-bulb thermometer).

Wet-bulb temperature (WBT) is the lowest temperature that can be reached through evapourative cooling in the present ambient temperature and humidity. A high WBT results in your body starting to overheat as sweating looses effectiveness.

WBGT is an index for measuring heat stress in direct sunshine. It takes into account the effects of wind speed and solar radiation.

Here's the map for WBT for that timestamp from windy.com using ECMWF data:

The highest WBT I could find there was around 29°C.

[–] siderea@universeodon.com 10 points 1 year ago* (last edited 1 year ago) (1 children)

@0101010001110100 Thanks for the warning! FYI, wet bulb *globe* temperatures (which this map reports) aren't the same thing as wet bulb temperatures.

When you hear about certain wet bulb temperatures being unsurvivable, the assumption is one has already found shade and that is the wet bulb temperature out of direct sunlight. Or put another way, those fatality limits are if the wet bulb temperature in shade is over a threshold, then it's fatal.

Wet-bulb *globe* temperatures are slightly different: they're the weather forecast in direct sunlight. Moving to shade helps get you into a lower wet-bulb temperature.

So this is Bad, but it's not *quite* as catastrophic as it sounds like.

[–] DarkThoughts@kbin.social 2 points 1 year ago (2 children)

Is there a site that shows actual wet bulb risk forecasts globally based on accumulated weather data sets? I'm guessing this will become more and more relevant, especially around the equator.

[–] Deme@sopuli.xyz 1 points 1 year ago* (last edited 1 year ago)

Windy.com is a great site and has a layer for forecasted WBT.

Link to the layer

[–] MsPenguinette@lemmy.blahaj.zone 2 points 1 year ago

It's not the heat that gets you...

[–] GreenMario@lemm.ee 2 points 1 year ago

All along the Mississippi River too hmm 🤔