Pinpoint Weather: Fall feel to the last weekend of the summer

Weather Blog

Pinpoint Weather:  Mostly sunny and cool pattern this weekend

This is the last weekend of summer 2020 and the weather will be very fall-like. The afternoon highs are expected to reach only the middle 60s most locations east of the Parkway and the low 60s west of that location, both are about 10 – 12 degrees below normal for middle to late September. The skies will be relatively void of cloud cover after the morning hours, but there may be a few high clouds streaking across the lower tier of the Commonwealth. High pressure well to the north of the region will be in just the right position to push in cool air from Canada giving us the fall feel that will linger into the beginning of next week. The cool air will develop a wedge along the east side of the Appalachians allowing the milder than normal conditions.

Sunday will be similar to Saturday and Monday will be similar to Sunday. In other words look for the lovely dry and cool weather to stick around for a few days.  The return of the milder air will ironically be on the first day of Fall, Tuesday, but even then the air will be about normal, topping out in the upper 70s and a few low 80s.

Fall arrives officially on Tuesday at 9:31 am when the direct rays of the sun cross the Equator.  This is the half way point of the perpendicular rays as the migrate back and forth between the Tropic of Cancer to the north and the Tropic of Capricorn to the south.  We should start to notice the leaves changing up a bit this weekend, and I am hopeful that this year we will be looking at a much more vibrant year color wise than the past few.  So, what makes the leaves change color, simple, the chlorophyll in the leaves is green and that is what enables plants to use the sun to create food.  As the days get shorter and cooler chlorophyll production slows down and eventually stops, then the other colors present in the leaves get to show up.  Much more on that in a later post.

As for the Tropics: We have moved into the Greek Alphabet Friday with Alpha and Beta being the latest in our string of tropical cyclones in the Atlantic Basin.

For much more on the tropical situation this season, check out our Tracking the Tropics Section here on this website.


Stay safe and healthy,

John Carroll

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