Brief Period Heat to Distinguish the Beginning of Work Week

Posted: August 21, 2023 3:00 pm

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While it has been a mild weekend for the Northeast with moderate temperatures and mostly calm conditions, another surge of heat will impact the region for a brief time to start the week. Here is a look at this forecast.

Records That Have Stood for a Century Could Fall on Monday

It is going to be another case of weather whiplash for the Northeast and beyond this week with rapidly increasing temperatures followed by another cooldown. A cool air mass pushed through the Great Lakes and into the Northeast over the last few days, sending the mercury down to outright chilly readings in the overnight hours.

Residents enjoyed getting outside for the fall-like weather this weekend, however, another mass of heat is just on the horizon.

Forecasters predict that this heat may even challenge some record high temperatures heading into the mid-Atlantic. Some of these records that could fall have been on the books for over 100 years.

The temperatures began to tick up on Sunday, signaling the change in the overall weather pattern. The warming temperatures are the result of the southward dip that has been present in the jet stream lately moving back to the north. This movement will bring the cooler air north into Canada, ushering in weather that is more reminiscent of the middle of summer for much of the U.S.

As the dip in the jet stream moves back to the north, it will also allow warm and moist air from the central U.S. to move to the east, encompassing the Great Lakes and the Northeast. How warm will it get? Forecasters are expecting Monday’s weather to settle at about 5 – 10 degrees above the norm for the middle of August in the Northeast.

For instance, the high temperature in New York City will see a high of 90 degrees, well above the historical average for this time of the year in the Big Apple.

Temperatures in Philadelphia will hover in the low 90s during the peak afternoon heating hours. It will be slightly warmer heading to the south with places such as Washington, D.C. seeing a high of about 93 degrees under a mix of sun and clouds. Some of the communities along the Interstate 95 corridor may even see temperatures that end up being the warmest yet this summer, speaking to the relatively mild season that the region has experienced thus far.

The mid-Atlantic will be the most likely area to see temperatures flirt with the daily high record. For example, Richmond, Virginia is expected to top out at about 95 degrees on Monday. The daily high record for this city is 96 degrees, dating back to 1962.

Heat Will Not Hang on for Long

This last gasp of summer is not likely to hang on for long for the Northeast. Tuesday’s weather forecast is calling for another mass of cooler and drier air to move into this corner of the country, bringing the mercury down in the process. For example, after seeing a high in the 90-degree range on Monday, New York City will fall back to about the 80-degree threshold on Tuesday.

This cooler weather pattern in the Northeast will be influenced by the conditions on the other side of the country. The energy left from Tropical Storm Hilary will push over the Rockies and mix with a new weather maker coming in from the Pacific to push the cooler air mass to the east by late Monday and into Tuesday.

You can expect this wave of cooler air to move through the Great Lakes and down into the mid-Atlantic throughout the week. Wetter conditions will also fire up later in the week after a period of dry weather during the middle of the week. In short, the pattern of topsy turvy weather is going to be the norm heading into the weekend.

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