White Christmas Possibilities Northeast Middle Atlantic
White Christmas Possibilities Northeast Middle Atlantic
There is so much variability in the models lately and that variability continues today thanks to the fact that pressure patterns in the important areas in North America continue to remain and are forecast to be at extreme levels. When you have pressure patterns and oscillations running 3 and 4 times normal it sends weather models into a tizzy and makes forecasting the long range extremely difficult.
WHITE CHRISTMAS TELECONNECTIONS
The standout here is the East Pacific oscillation which rides down to a minus 300 reading which means cold air coming into the continental US as we near Christmas however the Pacific North America index being negative is not favorable for the East. Bear in mind these indices adjust and change as we get closer and are based on ensembles of the models which gives you an average forecast and not a specific one. The North Atlantic Oscillation which is the least important is strongly positive so there is no blocking. Remember blocking is not required for cold and snow. The East Pacific Oscillation to me is the most important of all the indices. This takes us to the weather outlook going forward which is really no clearer now that it was yesterday or the day before or the day before that, etc etc etc.
WHITE CHRISTMAS POSSIBILITIES GFS MODEL FRIDAY INTO SUNDAY
CLICK TO ANIMATE
The next important weather maker will be another cold front that approaches on Saturday with rain as low pressure heads to the Great Lakes and eventually into Eastern Canada. That rain should be done by late Saturday with the front stalling to our south. Christmas Eve and Christmas Day will hinge on the front, where it stalls, and whether a wave develops on it or not. Weather models have been doing 180 degree flips for the last week on this. Very cold air will be pouring into the U.S. but models can’t seem to decide how much of that colder air moves eastward. The models have been so unstable with all the pressure patterns in the Pacific pushed to extreme levels.
LATEST MODEL RUN SHOWING SNOW CHRISTMAS EVE & CHRISTMAS DAY CLICK TO ANIMATE
The last 2 runs of the GFS model were showing a warmer look as the map above indicates. When you click on it you will see which areas are forecast to see 24 hour snow fall Christmas Eve & Christmas Day. This stands in strong contrast to colder models last night which had snow much further south.
OVERNIGHT GFS MODEL SNOW CHRISTMAS EVE & CHRISTMAS DAY CLICK TO ANIMATE
The question of how much cold air comes into the Eastern US remains in flux. Models are going to have to lock in soon as to which way this is going to go. What we know for sure is that Friday night into Saturday we will see rain. After that is going to depend on how far south the front gets and how much of the cold air coming down from Canada pushes to the east. Don’t expect much clarity on this for at least another couple of days.
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