All of the above are 500 mb (18,000') charts with the top graphic from this morning, the middle two valid Thursday morning and the bottom valid for Jan. 17th. Let's discuss. The top shows an approaching trough that will bring us tomorrow's cold front. Note how that trough closes off an upper low just to our north for Thursday. That should keep clouds hanging over us well into Friday after the over night front passes through. But focus on the pattern shift from the top graphic (Today's flow) to the bottom one valid 12 days from now. Clearly the current flow that is keeping out the Arctic cold will shift to a big dive into the United States that will bring down the coldest air of this Winter season.
Fortunately, the super cold (40-50 below) air of several weeks ago has moderated to only 20-25 below. Still, that chill is coming our way and we need to get ready for what Winter is supposed to be like...COLD!
You can start to see the coma shape clouds over Texas that is the start of the wrap around process as the upper low closes off. I will leave my potted plants outside tonight to get a good soaking and then decide if I need to bring them into my He-Shed for this weekend. The FOX 8 7 day forecast is calling for light freezes on the North Shore, but not for the South Shore.
1 comment:
I have a weather question because I read a news article today that used an expression that I've never heard, "rapid warming has forced the winds to sack." Does this mean something like stall? I tried searching for the term but that only brought me back to the article where I read it and then I thought perhaps you could explain. Thanks!
link to the article:
https://www.yahoo.com/entertainment/polar-vortex-could-split-two-204943366.html
Truly hoping that we don't get very cold weather--folks up north are better prepared than we are!
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