While the heat index was already approaching triple figures by noon today, the weekend promises to be even more blistering. That has something to do with the rather-sudden dryness, meteorologists say.
» READ MORE:The harvest of dust has contributed to the heating, said John Feerick, senior meteorologist with AccuWeather Inc. When the ground and foliage are moist, some of the sun’s energy is diverted to evaporation. When it’s bone dry, the sun can cook away.
Feerick and other meteorologists theorize that although summers have been warmer, increased atmospheric moisture around here has been putting a cap on daytime temperatures. That coincides with a climate-change symptom: Warmer air can hold more moisture.More moisture, which would increase the chances of heat-wave-breaking thunderstorms, also might explain why the region has avoided long-enduring hot stretches, they say.
That humidity is having a powerful and potentially dangerous effect at night. Water vapor at night inhibits the release of daytime warmth. “The duration and overnight low temperatures are a big concern with this event,” said Sarah Johnson, warning coordination meteorologist at the National Weather Service Office in Mount Holly. “Overnight lows within the city are not forecast to get below 75 degrees throughout the weekend,” and perhaps not below 80 early Monday.
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