Wet-bulb globe temperature (WBGT) warnings for the U.S. today

Source: digital.mdl.nws.noaa.gov/?zoom=4&lat=37&l…

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.

Deme, (edited )

*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:

https://sopuli.xyz/pictrs/image/c3c0e453-475b-4c3f-8d11-8e45315a15cd.jpeg

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

droans,

Fortunately it doesn’t seem to be deadly levels. But it’s still in the “don’t exert yourself too much, carry water, take frequent breaks” level.

SuzyQ,

I’m in one of the extreme areas. It’s been miserable. Last I saw we should be getting a reprise come Friday.

GreenMario,

All along the Mississippi River too hmm 🤔

siderea,

@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,

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.

siderea,

@DarkThoughts

I haven't found one.

@0101010001110100

Deme,

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

Link to the layer

HelluvaKick,

Can’t wait to work outside today (live in black region)

Frozengyro,

Well, at least you’ll only have to do it once /s

MsPenguinette,

It’s not the heat that gets you…

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