drjeff
Well-known member
In a nut shell, the (Arctic) Polar Vortex this year isn't quite where it usually is!
The map above represents what could be called a "normal" set up in the upper level wind current known as the Polar Vortex. The big, large "PV" near the top of Hudson Bay will usually serve to bring cold, arctic air down through central Canada, across the high plains of the US, and then start usually somewhere around the Ohio River Valley to bend back to the North and East, usually steering storms somewhere near the Coast of Long Island/Martha'a Vineyard/Nantucket which gives New England it's larger storms.
For much of the last 4 to 6 weeks, the center of rotation of the Polar Vortex has been a bit South and East of it's "usual" location, this steering the storms further South and not letting them "turn the corner" and get to the prime New England location, also with the center of rotation being a bit East of usual, when the storms do start to turn North and East, they're not tracking as close to the Coast by Cape Cod and Main as usual, thus closing out Northern New England from a primary storm hit.
The other thing one has to remember is relatively speaking, cold dry air is denser than warm moist air, so the moitsure from the storms have been having a tough time extending out Northward from the center of the storm into the STRONG POOL of cold air that has generally been associated with this years Polar Vortex.
The map above represents what could be called a "normal" set up in the upper level wind current known as the Polar Vortex. The big, large "PV" near the top of Hudson Bay will usually serve to bring cold, arctic air down through central Canada, across the high plains of the US, and then start usually somewhere around the Ohio River Valley to bend back to the North and East, usually steering storms somewhere near the Coast of Long Island/Martha'a Vineyard/Nantucket which gives New England it's larger storms.
For much of the last 4 to 6 weeks, the center of rotation of the Polar Vortex has been a bit South and East of it's "usual" location, this steering the storms further South and not letting them "turn the corner" and get to the prime New England location, also with the center of rotation being a bit East of usual, when the storms do start to turn North and East, they're not tracking as close to the Coast by Cape Cod and Main as usual, thus closing out Northern New England from a primary storm hit.
The other thing one has to remember is relatively speaking, cold dry air is denser than warm moist air, so the moitsure from the storms have been having a tough time extending out Northward from the center of the storm into the STRONG POOL of cold air that has generally been associated with this years Polar Vortex.