NEW: The National Weather Service issued a tornado warning for parts of New Hampshire as severe thunderstorms popped up across New England.
The severe thunderstorm threat during the afternoon and evening will stretch from the northwest to southeast across New England, though areas south and east of a line from Boston to Providence will probably wait until evening before any storms arise.New England's heat wave continues. It isn’t a new story, but it does reach a new impact on the body Thursday, into dangerous levels for some.
Heat and humidity are reaching one peak Thursday, with another expected Sunday. Each of the days sport temperatures into the 90s with dew point temperatures reaching oppressive values in the 70s, boosting heat index values to around 100 degrees. Heat index is often referred to as"feels like temperature," measuring impact on the body, and represents the body’s decreased ability to cool in hot and humid conditions. Our bodies are able to cool by sweating, but more specifically, when sweat evaporates, the body cools. With abundant humidity, sweat doesn’t readily evaporate off the body and therefore isn’t as effective at cooling, meaning, under normal humidity conditions, the temperature “might as well be” the heat index value.
Incoming dry air aloft will couple with increasing elevated wind to promote swaths of damaging wind gusts in Thursday thunderstorms, prompting severe thunderstorm warnings. Be ready to seek shelter if storms threaten your community. Keep in mind lightning doesn’t prompt a severe thunderstorm warning like wind and hail do, so remembering"when thunder roars, go indoors," helps to keep folks safe from regular, non-severe thunderstorms.
Scattered storms will slowly wane overnight Thursday and less humid air arrives for Friday and Saturday but the heat continues. Although storms won’t be commonplace Friday and Saturday, isolated storms certainly are possible just about anywhere in New England in the intense heat. An increasing south wind Sunday will bring a return of oppressive humidity, heat index values around or over 100 degrees and perhaps some scattered afternoon or evening thunder.
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