White Christmas Likely For Portion Of The Area
Weak System Impact On Tuesday
Synoptic Overview
It now appears as though the possibility of a White Christmas has increased for at least a portion of the area, despite Friday's "Grinch" storm having scoured the region of any residual snowpack. This is due to a weak system that will break off of the Pacific energy out west during the day on Tuesday and subsequently slide to the east-southeast in the flow between the polar vortex and central US ridge.
Although this energy will begin to amplify upon reaching the coast as it descends the eastern periphery of the ridge, it will do so too far to the east to produce a significant storm for the forecast area. Had this ridge been centered a at the longitude of Montana as opposed to Minnesota, far greater travel disruptions would be likely given that a faster rate of amplification would yield a much more significant storm further to the west, and closer to the coast. While that will not be the case, a period light snowfall will leave light accumulations across especially the interior.
However, the track of the system will be to the north of the area prior to a full transfer to the coast, which will allow winds to switch to the south.
This will eventually induce a transition to rainfall prior to precipitation ending Tuesday evening across much of the coastal plain, which will obviously affect which locales manage to observe a White Christmas (1" or greater of snow on the ground at 7am Christmas morning).
Anticipated Storm Evolution
Light Snow will begin overspread the western half of the area during Tuesday morning and reach all but the eastern third of the area by midday. The morning commute should be fine given the late start of the snowfall, meager intensity and the reduced volume of traffic given the holiday period, however, commuters in Connecticut may be wise to leave some extra time, especially southwestern areas.
The south coast of Connecticut will have transitioned to rain b early evening, as the storm begins to intensify and the storm moves closer to peak across the area, which will slow a Tuesday afternoon commute that will likely already have a heavier volume owed to holiday traffic.
The storm will begin to redevelop off of the coast by midnight into the early predawn hours of Christmas Eve, but not before precipitation ends as rain roughly inside of I 495.
Snow and rain showers will taper off during the predawn hours on Christmas Eve, with the first light yielding a festive blanket of white across the interior, a barren, puddle-filled earth near the coast.
Stay tuned for more information on what maybe a similar system on Boxing Day.
FIRST & FINAL WHITE XMAS CALL: