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.
*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.
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.