FIRST ALERT: Region Bracing for Dangerous Heat, Temps to Approach 100 Degrees

A First Alert has been issued ahead of the weekend with heat index values expected to surpass 105 degrees

With dangerous heat on its way, the meteorologists at NBC10 Boston and necn have issued a First Alert through the entirety of the weekend.

As of Friday morning, we’re not quite into dangerous territory yet. After a comfortable start, a warm front crossing New England from west to east represents the leading edge of returning deep summer heat and humidity, with dewpoint temperatures around and over 70 indicating a soupy airmass, and temperatures poised to push 100 degrees.

Because the air is arriving Friday, most communities top out at 90 to 95 Friday afternoon, though Maine and Cape Cod will be cooler, receiving the new air last.

Central and northern Maine will continue to see scattered showers and thunderstorms Friday afternoon as the new air takes hold. Upstate New York thunderstorms Friday evening may bleed into western Massachusetts and Connecticut during the first part of Friday night; otherwise a sticky and warm night is expected with patchy fog.

Saturday and Sunday will be very similar days. Temperatures will rise to near 100 degrees with heat index values between 105 degrees and 110 degrees and a very high UV index with ample sun amidst the incredible humidity.

A Canadian border storm is possible late Saturday and could carry as a few storms into the mountains Saturday night, otherwise the chance of thunder rises later Sunday into Sunday evening, particularly the farther north and west one is.

By Monday, a slow-moving cold front sags south into New England, touching off thunderstorms but also marking an end to the deep heat and humidity. This will usher in drier, more comfortable air that will take hold Tuesday and last through much of next week in our exclusive First Alert 10-day forecast.

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