We've already have a few decent snow events this winter. The first was on December 1st. The second was Christmas Eve and Christmas Day, the snowiest Christmas Eve/Day since 1995. The National Weather Service here in Cleveland has a great summary HERE .
Now that we are a few days into January 2021, what does the current pattern tell us?
If you remember back on December 8th on my post, I mentioned the possibility of a GREENLAND BLOCK (red color) which would increase the possibility of cold and snow to finish out December.
|MODEL animation from December 8 showing potential Greenland Block|
It was too early at that point to say for certain that the mid-late December pattern would be a harbinger of what was to come in January. Now look at the animation below. See how the block (red color) near Greenland is staying in place. Also see how the western North America ridge (red colors) is starting to develop. This is a bigtime one-two punch: Ridge west (potential block) and a ridge (Greenland block) east.
The jet stream is trending MUCH stronger. Look at the warmer colors across the eastern US. East coast snow lovers will love this!
Top years with similar pattern shows below normal temperatures the 3rd week of January
So after watching the pattern over the last month becoming more persistent, as of this writing (January 4) all this seems to be foreshadowing more cold and deeper southern storm systems!
Some projections are starting to show this idea.
|First 2 weeks of January snowfall|
|3rd week of January snowfall projection|
What about the Polar Vortex? Are there indications this become more unstable in the weeks ahead? Absolutely.