Mid Month Winter Mayhem Potential Looms
Multiple Winter Storm Threats on Horizon
It was discussed last week how changes in the tropical Pacific would lead to a reprieve from the la nina like regime and lead to a much more active winter pattern across the area. Current long range guidance continues to carry a rather emphatic three-pronged signal that is centered on mid month.
The first system for next Monday looks to pass out to sea, as it does no look to have enough room to amplify in time given the lack of ridging over the western US and the significant confluence in place over se Canada behind this week's rainfall.
European Ensemble Mean:
GFS Ensemble Mean:
The second system looks to make its closest pass Friday, January 13. And while it does pose more of a threat than the first system given some slight ridging in the vicinity of the Rocky mountains:
European Ensemble Mean:
Said ridging is very modest and still may not be quite strong enough to allow the system to amplify enough for a major strike of the area, especially with no apparent downstream low southeast of the Canadian Maritimes to slow downt he flow (50/50 low).
GFS Ensemble Mean:
But its the third threat that has been consistently modeled on guidance to threaten the region on or around Saturday, January 14th that poses the largest threat given a more significant PNA ridge out to the west to allow for more amplification.
European Ensemble Mean:
GFS Ensemble Mean:
Stay tuned to forecasts over the course of the next week.