Sunday was the fourth day in a row where temperatures were below 80 degrees and this afternoon will make it the fifth. After a brief return of the 80s by the middle of the week it looks as if the chill will return by the end of the week and into the weekend. An amplified blocking pattern will begin to develop mid-week with a strong upper level low near Hudson Bay as what appears to be a Greenland Block trying to develop. This is when high pressure develops near Greenland and in turn forces the jetstream southward across the U.S. This will cause the jetstream to move as far south as the mid-Atlantic and bring below average temperatures through the weekend.
Average highs for the middle of August should be right around 83 degrees and as it stands right now it looks like highs by the end of the week will run a good ten degrees below that in some locations. In fact, the cooler weather looks to stick around for the next week and a half to two weeks.
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