Hot, humid air to make it feel like 100 in northeastern US by late this week

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Hot and more humid air will build over the northeastern United States at midweek and continue into this weekend. Locally drenching thunderstorms will erupt amid the steamy weather.

"While it will not be as hot as the heat wave from late July, humidity levels may be higher and will make the air feel very uncomfortable for some people," according to AccuWeather Long-Range Meteorologist Edward Vallee.

The combination of heat, high humidity, sunshine and other conditions will push AccuWeather RealFeel® Temperatures above 100 F in much of the Northeast during the second half of this week.

Actual temperatures will climb only a few degrees in most coastal areas, but more humid air will make it feel significantly hotter. High temperatures will trend upward from the upper 80s to the lower to middle 90s in much of the Interstate 95 corridor.

The Appalachians and lower Great Lakes region, which have been enjoying warm days with low humidity and cool nights, will have the most noticeable change. Highs in the lower to middle 80s will be replaced with highs in the upper 80s to the lower 90s.

The biggest change will be felt at night.

"Temperatures in some of the urban areas of the major cities will fail to drop below 80," according to AccuWeather Meteorologist Jim Andrews.

"This spell of heat and high humidity will be very tough for people who do not have air conditioning to sleep very well at night," Andrews said.

In the Appalachians, low temperatures in the upper 50s to near 60 at the start of the week will be exchanged for lows in the upper 60s to the lower 70s late this week.

Those partaking in vigorous physical activity or manual labor will need to increase their fluid intake and adjust their schedule to avoid the hottest part of the day, the afternoon and early evening.

Expect little heat relief from the wind into the weekend, as no breeze will stir, except at the beach or in the vicinity of spotty thunderstorms.

Accompanying the hot, humid air will be an uptick in shower and thunderstorm activity.

A small amount of the tropical moisture responsible for dumping inches of rain near the Florida Gulf coast will get strung northeastward from midweek on. At first, the downpours are likely to be spotty.

Showers will first develop late Tuesday in Virginia and West Virginia and will expand northward to parts of Pennsylvania, New York, New Jersey and New England by Wednesday evening.

"During this weekend, the combination of the tropical moisture and an advancing front could bring rain to many areas, especially from the Ohio Valley to New England," Vallee said.

Despite the risk of storms, the pattern will offer a great opportunity to cool off at the beach or the pool, prior to the start of the new school year. Most of the storms will struggle to reach the barrier island beaches until the evening hours and will depart by mid-morning.