By Alex Sosnowski, Expert Senior Meteorologist
June 17,2014; 8:57PM,EDT
The hottest weather of the current hot spell and the hottest day of the year so far will be Wednesday for many areas from the Ohio Valley to the mid-Atlantic and South.
The hot weather will be accompanied by high humidity and will add to the short-duration swelter.
AccuWeather RealFeel® temperatures will exceed 100 F and can reach 110 F in some urban areas of the major cities during the afternoons through midweek.
Long Range Expert Paul Pastelok mentioned last week that many areas in Ohio, Indiana, Pennsylvania, New Jersey, southern New England and parts of New York state will have their first 90-degree Fahrenheit reading of the year during the middle of this week.
Highest Temperatures So Far This Week
The worst of the heat will be concentrated along the I-95 corridor from Washington, D.C., to the Carolinas and from Atlanta to Birmingham, Alabama; and Jackson, Mississippi.
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Washington, D.C., and Baltimore are forecast to have at least three days in a row with temperatures reaching 90 F or higher.
When this occurs in the Northern states, it is considered to be a heat wave. Both locations hit 90 F on Monday.
According to Northeast Weather Expert Dave Dombek, "For areas from Philadelphia to New York City this is later than average for the first 90-degree weather of the season."
Typically the first 90-degree high occurs during late May in both areas. The latest 90-degree high has occurred at both locations is during the middle of July.
"The important thing for most people is to give their body a chance to adjust as the first weather of this sort of the summer can be a shock to the system," Dombek said.
"Don't overdo it in the heat of the day, and drink plenty of fluids."
Late in the week, cooler and less humid air will sag southward from Eastern Canada, bringing a change of air for New England and the mid-Atlantic.
The zone of hot, humid air will be squeezed to the south and west Thursday and Friday. The hot, humid conditions will hold over the South and will be slow to leave the Ohio Valley. In parts of the South, the hottest days in the pattern may occur late in the week.
During the hot spell, as it is leaving and after it departs, there will be rounds of showers and thunderstorms rolling in from the Midwest, while spotty showers and storms develop in the backyard.
The zone of showers and heavy thunderstorms and isolated severe weather will sag southward during the middle and latter part of the week but will reach a certain point and will grind to a halt. As a result, areas from the central Great Lakes to the lower mid-Atlantic and Carolinas may be unsettled through the weekend.
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