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Heat wave looms for I-95 corridor of Northeast

An extended heat wave is in the forecast for the Interstate 95 corridor of the northeastern United States, AccuWeather forecasters say. The building heat will bring a prolonged stretch of 90-degree temperatures to several major cities that have not experienced many prolonged heat waves so far this summer. In the Northeast, a heat wave is defined as three consecutive days where high temperatures reach 90 F or greater, according to the National…



AccuWeather forecasters are predicting an extended heat wave along the Interstate 95 corridor in the northeastern United States. Several major cities, which have not yet experienced many prolonged heat waves this summer, will experience a prolonged stretch of 90-degree temperatures as a result of the building heat.

According to the National Weather Service, a heat wave in the Northeast is three days or more of high temperatures exceeding 90 degrees Fahrenheit.

By mid-July, both New York City and Boston typically experience a week of days with temperatures of 90 degrees or higher. It’s been 90 degrees or higher in New York City every day since July 17, but so far it’s only happened twice in Boston. As of July 17, Washington, D.C., has had 12 days of 90-degree heat, which is a few fewer than the city’s average of 16.

It doesn’t matter if the jet stream dips frequently over the Northeastern states this month because it won’t help much. When the jet stream moves southward across the United States, it usually aids in bringing cool air from Canada southward. Even in the northernmost regions of North America, there is a lack of cool air in place at this time of year.


This region will still be protected from the long-lasting 100-degree heat waves that have plagued the South Central states this summer and more recently contributed to the record-breaking heat in Western Europe because of the jet stream pattern dips. The excessive heat in both cases has been caused by a northward bulge in the jet stream.

This week and perhaps even into next week, all locations along the Interstate 95 corridor from Virginia to Massachusetts will see a significant increase in the number of 90-degree days. For the first time since early June, temperatures are expected to be 5 to 10 degrees above normal.

The city of Philadelphia, which has had the best luck with hot days so far this summer, is on track to have seven or more days in a row with temperatures above 90 degrees. This summer, Philadelphia has recorded four consecutive days of 90-degree highs two times.

It’s still early in the summer for Boston or Washington, D.C. to experience an official heat wave, but New York City did between July 12 and 14.


While New York City is expected to hit 90 degrees on Tuesday through Saturday, Philadelphia has the potential to hit 90 degrees on a daily basis for the rest of the weekend and beyond. This would be the first summer heat wave to hit Washington, D.C. This week, the city of Boston could see as many as five consecutive days in the 90s.

Throughout the Appalachians, there is a reasonable chance of some day-to-day temperature variation. Sea breezes are expected to keep most beach communities cool on a daily basis.

With temperatures expected to continue to rise throughout the week, many locations could record their highest temperature of the year thus far. Boston reached 92 degrees Fahrenheit on July 1 this year, while New York City reached 93 degrees Fahrenheit on May 31. The year’s current high temperature in Washington, D.C. is 99 degrees, set on June 17 of this year.

On the majority of days, the heat will be accompanied by the high humidity typical of the second half of July. Some people in the Northeast may notice a slight drop in humidity on Tuesday compared to the other days of the week.


Heat, humidity, and sunlight all contribute to AccuWeather RealFeel® Temperatures being pushed 5 to 15 degrees higher than they actually are.


Evenings will be unbearably hot and humid as temperatures continue to rise in major cities for several days in a row. Buildings made of concrete, asphalt, or brick will continue to radiate heat long after the sun has set.

Experts advise people to stay hydrated and to avoid strenuous activity or physical labor when RealFeel® temperatures are at their highest, which is usually in the midday and late afternoon. There is a risk of heat exhaustion or heatstroke even if an individual is physically fit. Heat-related illnesses are more common in the elderly and young children, so it’s important to keep an eye on them and keep them cool whenever possible.


The term “dog days of summer” is derived from the appearance of the dog star “Sirius” in ancient times during the same period of the year as the hottest months of the year in the United States and the Northern Hemisphere.

Only a few daily high temperature records are expected to be broken, according to forecasters. A few daily records could be challenged this weekend and early next week as the ground dries out following some rain and thunderstorms.

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