Is wet bulb heat changing how the Eagles practice this summer?

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Wet bulb readings already factored into FIFA's decision to incorporate hydration breaks into World Cup 26 matches — could those readings also impact when and how the Philadelphia Eagles practice during training camp?

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High wet bulb readings aren’t just a technical detail. Once they climb into the upper 80s and beyond, Penn State researchers and ClimateCheck say conditions can become life‑threatening, even for healthy people like NFL players, because the body simply can’t shed heat fast enough.

The Eagles are holding camp at the Jefferson Health Training Complex starting July 28, and the main chance for fans to watch is a single public practice at Lincoln Financial Field on Aug. 25.

The Eagles and most other NFL teams have protocols in place to deal with the heat during training camp.

Here's what wet bulb reading are, and what the Eagles' plans are to beat the heat before the regular season opens.

What is a wet bulb reading?

Meteorologists and health experts now watch something called “wet bulb” temperature — a measure of heat and humidity that tells you when your body can no longer cool itself, and when conditions can turn deadly even for healthy people exercising or working outside.

The National Weather Service describes wet bulb globe temperature as a way to measure heat stress in direct sun that blends air temperature, humidity, wind, sun angle and cloud cover — unlike the standard heat index, which only looks at temperature and humidity in the shade.

The higher the wet bulb temperature, the more dangerous weather conditions can become, particularly for older adults, people with heart or lung conditions, and anyone doing strenuous work outside.

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Understanding a wet-bulb reading

The National Weather Service says a wet bulb thermometer is just a regular thermometer with its bulb wrapped in a wet cloth; as the water evaporates, it cools the thermometer, mimicking how sweat cools your skin.

The Heat Stress website says wet bulb numbers in the 70s generally mean most healthy people can be outside with normal precautions, but once readings climb into the 80s — especially the mid‑ to upper‑80s — scientists and safety experts say the risk of heat illness rises quickly, even for fit, healthy adults. 

According to ClimateCheck, wet bulb values above about 86 degrees are considered hazardous, and above about 90 can be life‑threatening if exposure is prolonged.

Eagles brace for heat as wet‑bulb readings shape training camp plans

Former NFL player Cole Beasley stirred the wet-bulb controversy when he questioned why football practices had to be paused or canceled due to high wet-bulb readings.

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