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Waves of cool air will continue to roll in from Canada and into the midwestern and northeastern United States into early week.
As has been the case multiple times this summer, people will be able to save on their cooling bills by turning off air conditioners and fans and letting fresh air into their homes.
Along the Atlantic coast and over the Ohio Valley, temperatures will still be warm enough for swimming during the afternoon. Atlantic surf temperatures are close to their highest level of the year right now and in the 70s to near 80 in the mid-Atlantic.
Air temperatures will be suppressed from their average levels by 5 to 10 degrees Fahrenheit into early week.
For example, the average high temperature in Chicago and New York City for the last week of August is in the low 80s. Both cities can expect highs in the 70s into Tuesday.
At night, temperatures will dip as low as the lower 40s in portions of the Upper Midwest and the central and northern Appalachians.
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People who are sensitive to cool weather may need to grab a jacket and switch to long sleeves at night.
During the middle to latter part of the week, warmth may build in from a less common direction. Usually warm air surges in from the Southern states.
An atmospheric road block may cause weather systems to reverse their normal west to east and south to north direction across the northern tier.
"Later in the week, warmth by way of sunshine is likely to build from southern Quebec to New England and upstate New York," according to AccuWeather Lead Long-Range Meteorologist Paul Pastelok.
High temperatures may trend upward into the 70s and 80s for a time late next week in the Northeast.
Meanwhile, a pool of cool air, relative to average, will settle over the Midwest and the South.
Some of the coolness in the South will be associated with cloud cover and rain from Harvey which made landfall in Texas and has currently stalled.
As the weather pattern begins to resume its normal movement, rain from Harvey could be drawn northeastward late in the week. However, there is a greater chance that Harvey misses the connection and stays parked over Texas through the week.
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