More detail on our incoming air source, from near the Labrador Sea
Arriving closer and closer to D.C. this afternoon and evening is a somewhat narrow piece of cooler, less-humid air from around the Labrador Sea offshore of Canada. I argue that the source of our air pushing into our region behind this back-door cold front has traveled up to 1,750 miles to get here.
The Labrador Current is known as a very conveyor belt of water that moves southward from near Greenland. It’s the balancing act to the Gulf Stream moving warm water northward from near the tropics. These two ocean currents are the ocean circulation engine for our part of the world and are very important for balancing the heat content of our hemisphere.
Luckily any cool-air shock for the D.C. area is very limited for us this time. This air really only sticks around about 36 hours in our region before it retreats back out to sea, toward its source region far to our northeast. And, when traveling as far as it has, the air has modified and been warmed as it’s traveled away from the cold water of the Labrador Sea.
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