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sunshinesnacks01/21/20253 repliesview on HN

According to https://www.weather.gov/arx/heat_index, 100 deg F with 95% RH is a heat index of 185 F. The linked paper says "temperature often approached 100 F with relative humidity above 95%," and later references specific conditions of 92 F and 95% RH (137 F heat index).

Are these sorts of heat index values feasible for a plant environment? The line about 100/95 seems almost hyperbolic, which doesn't help with credibility in my opinion. Maybe I'm missing something.


Replies

jacoblambda01/21/2025

That's basically normal for unconditioned factory spaces in the US south during the summer. Ungodly hot, ungodly humid, and generally just shit to exist inside.

This is in large part why historically industrialized factories tended to be concentrated in colder, higher latitude regions until the 20th century. Without refrigeration the work was far harder and more exhausting for the workers and that limited efficient use of labor.

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pixl9701/21/2025

There are a lot of places in plants that can end up being deadly for any extended amount of times in particular weather conditions.

There was a grain processing plant up in the midwest were my dad worked that had an area enclosed in between building they'd close off access to on the hottest summer days. Light would be excessively focused in that area from other buildings, and moisture from other processes and lack of air circulation lead to deadly wet bulb temperatures.

dylan60401/21/2025

> 100 deg F with 95% RH is a heat index of 185 F.

So just a typical summer day in Texas