The ‘Wedge’ Continues This Week, Bringing Cooler Temperatures to Metro Atlanta

Cooler, drier air returns via the easterly breeze.

Our buddy “The Wedge” returned this weekend, and it will linger throughout the rest of this week!

I call this “our buddy” because The Wedge happens pretty frequently in Metro Atlanta. The metro area is located in the Piedmont of the Appalachian Mountains, which means it is in the southern periphery of the mountain chain.

When a pressure system sets up along the East Coast, it forces -- or “wedges” -- cold air into the Appalachian Mountains. For Metro Atlanta, the “wedge” often sets up when high pressure is located in New England.

Other times, the “wedge” develops when low pressure is just off the coast of New England or the coast of the Carolinas. This is the case for this week.

This air accumulates along the ridge of the mountains, and it is able to rise high enough to create cloud cover, but not necessarily enough to move over the top of the mountain range. As a result, the cold, dense air oozes or slides south along the mountains before draining in the Piedmont in north and central Georgia.

As a result, easterly winds will continue to push cool, dry air in to Metro Atlanta. Both morning and afternoon temperatures will remain about 5 degrees below average for the first half of this week, before the air moderates and warms up with the sunshine.

Atlanta will remain rain-free until this weekend, when the coastal low retrogrades, or moves west, over the Southeast on Friday through Sunday.

Below is the forecast for the rest of this week.

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