Gulf Of Alaska High Just Won't Go Away Long Range
Gulf Of Alaska High Just Won't Go Away Long Range
We continue to monitor with a certain degree of frustration the evolution of the long range weather pattern as we march through February. Days tick away for snow lovers who have either thrown in the towel on the rest of the winter and are lining up along mountainsides about to take the jump off the cliff. After a brutally cold and active start it has been nothing but cold air masses coming in and moving out and storm tracks to the west thanks to no blocking whatsoever. That pattern remains very progressive (fast west to east) with no signs of that changing anytime soon. For Central and Northern New England the snows continue and have been substantial. For the coast it has been either cheap thrills for some areas and not much at all elsewhere.
EUROPEAN JET STREAM FORECAST MONDAY FEB 12 2018
The European model for Monday morning illustrates the issue. The ridge along 140 degrees west is TOO FAR WEST. This creates troughing in the west. Though the flow is split with a vortex in Central Canada supplying cold air, the Atlantic ridge is strong and this creates a scenario where cold highs come down and move in and out. There is nothing to hold the cold air in. There is absolutely no blocking at all in the Atlantic. Looking ahead all the way out to day 10 there is no change in this regime.
EUROPEAN JET STREAM MONDAY FEBRUARY 19TH
The only way we can see snow out of this is if somehow energy comes out in that southwest flow and times out with one of the cold shots coming down out of Canada. Models have been hinting at a possibility of this next weekend however everything would have to line up perfectly for even a minor snow event so we aren't exactly worked up over this. Looking out further ahead to Day 16 on the GFS, it looks like more of the same.
GFS JET STREAM SUNDAY FEBRUARY 25
Until we see something that looks like a wholesale breakdown of this pattern, we will continue to see un-sustained cold shots lasting a day or 2, followed by warmer air and rain. Snow that matters will only occur if (and its a big if) the cold somehow were to time out perfectly with energy in the west southwest flow. The much talked about split of the vortex in the stratosphere remains the one unknown wild card in all this. Will this split drive a wholesale pattern change? That remains to be seen.
In opera it ain't over until the fat lady sings as the saying goes. Well she is clearing her throat and is about to walk on stage waiting for her cue.
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