From Meteorologist Mike Masco...
FWIW
FULL BLOCK SETTING UP AS WE HEAD INTO DECEMBER?
The latest European weekly run is flashing a very intriguing signal: a robust ridge building along the West Coast, arcing through Alaska, and extending all the way toward Greenland. That kind of alignment is classic high-latitude blocking, and it typically forces the entire jet stream to buckle south. When that happens, colder air is free to spill into the eastern half of the U.S. while storm systems ride along a more energized southern branch.
What’s even more interesting is the early suggestion of a Southeast ridge trying to flex at times. That feature can act as a pivot point—sometimes enhancing moisture return, sometimes redirecting storm tracks, and occasionally helping to “trap” systems along the East Coast. It’s the kind of tug-of-war setup that can produce some very dynamic nor’easter development if timing lines up.
Not to sound cliché because it feels like we say this every year… but based on the weeklies, this is legitimately one of the strongest early-season pattern setups I’ve seen at this range. If the blocking verifies, December could open with a bang.
I'll mention this a little on PIX 11 News Morning Show between 7-10am and over the weekend.