‘Atmospheric constipation’ is influencing Michigan’s weather – MLive.com

We always think about weather moving from west to east in a regular pattern. It’s not always that way, especially with the development of a feature called a “Greenland Block.”
A large upper-level high pressure system is the opposite of a storm center. The high pressure center is a circulation of air that spins in the opposite direction of a storm system. The opposite spinning air leads to clearer skies and warmer than usual temperatures.
This warmer, dryer upper-level feature is one of the strongest, most dominate features over the northern hemisphere right now. Since it is so strong, the other upper-level weather features develop back westward from the Greenland Block.
Here is the upper-air flow across the northern hemisphere. I’ve outlined the Greenland Block and the large storm north of us, with its location caused by the Greenland Block.
Greenland Block causing a back-up over Canada and the U.S. (Mark Torregrossa | MLive.com)
So the back-up of weather features is the Greenland Block and then west of it is a large storm system. The smaller storm systems entering the West Coast then travel on the outer fringes of the large upper-air storm. This puts the next storm, entering California now, on a track to head toward Michigan. This could be our next accumulating snow in part of Michigan.
The reason why this is important now is the question of whether this Greenland Block will be a common feature this winter. When the block occurs over Greenland, a trough of low pressure, or southerly dip in the jetstream, occurs over the eastern U.S. Cold and snowy weather usually occurs in this dip in the jetstream.
The very strong Greenland Block this early in winter could be a signal for some deep intrusions of arctic air into the eastern U.S., including Michigan.
In fact, the winter forecast from the long-range experts talks about wild fluctuations in weather this winter.
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