ROCHESTER, N.Y. – Over the last several days, the main weather story has been the heat. However, temperature alone does not tell the full story. Humidity and the amount of moisture in the atmosphere can make conditions feel significantly more uncomfortable.
A useful way to think about atmospheric moisture is to compare it to a kitchen sponge. At times, the atmosphere is capable of holding much more moisture, much like a sponge expanding to absorb additional water. As temperatures rise, the atmosphere’s capacity to retain moisture also increases.
This added humidity becomes especially important for anyone spending time outdoors. Normally, the body cools itself by producing sweat, which lowers body temperature through evaporation. On highly humid days, however, sweat evaporates much more slowly, reducing the body’s ability to cool efficiently and making conditions feel far more uncomfortable.
One of the best measurements of atmospheric moisture is the dew point. Recent dew point trends clearly illustrate the change in air mass across the region. Early Saturday, dew points were near 39 degrees, indicating relatively dry air. By Sunday and Monday, dew points had climbed into the lower 60s, creating a much more humid and uncomfortable feel. In general, once dew points rise into the 60s, many people begin to notice the mugginess. The latest forecast guidance suggests dew points will gradually decrease over the coming days.
I once had someone tell me that during this time of year, temperature is not their biggest concern , but it is the dew point that matters most. After experiencing days like these, it is easy to understand why.
First Alert Weather In-Depth: Heat Tells Only Part of the Story WHEC.com.
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