Good Sunday, folks. December begins with milder air pushing into the region and that’s a trend that takes us into the middle of the upcoming week. This is a mild up that will be on the dirty side with clouds and showers. Those type of mild ups usually don’t last very long and neither will this one. By the end of the week, arctic air and frozen precipitation will try to take center stage.

Clouds will thicken today as a light shower or two tries to break out. These showers will increase into Monday and Tuesday as temps come back down a few degrees.

This happens as a MASSIVE arctic outbreak takes place across the plains and the western part of the country. One area of low pressure will develop in the Rockies and head toward the western Great Lakes by Wednesday. That drags a cold front into the region…

GFS

Arctic air is dense and very heavy and the models tend to underestimate how fast it can move. We are seeing the models speeding up the arrival of the cold into our region. Many now show this impacting us by Thursday. This is where things try to get interesting. I expect the arctic front to slowly sag across the state and stall out just to our south by the end of the week. Waves of low pressure will develop along this boundary…

SpecialThe temperature gradient along this front is going to be astounding. It will have -20 air behind it in the plains states and 70s ahead of it in the far southeastern part of the country. That’s a recipe to get a lot of precipitation to develop with these waves of low pressure. Overrunning moisture will filter north of the front and into the cold air. That may produce some nasty wintry weather from Texas through our region and into the Mid Atlantic states.

The GFS was the first to really start to sniff out the colder, faster scenario. You can also see the wave train developing..

GFS 2Remember… this will be low-level arctic cold air that penetrates farther south and east than you will see with a lot of the model maps.

Have a great Sunday and take care.