Saturday November 30

Snow to begin by noon Sunday
School Forecast for:
Monday December 2nd
Last Updated: 12:00PM Saturday November 30, 2019
Delay No School Early Dismissal
(High) 0%

Update: 11AM Saturday

Major winter storm will arrive in about 24 hours. The storm will come in two phases, each capable of being their own notable storm. This will produce a prolonged period of accumulating snow with hazardous travel impacts Sunday morning through Monday night.

The main points:
Snow Starts between 10AM and 1PM Sunday. Roads and walkways quickly become snow covered. Travel becomes hazardous by early afternoon. Moderate to heavy snow Sunday afternoon/evening. Lighter Snow/sleet Sunday night. Steady snow redeveloping around 4AM Monday. Continuous snow, heavy at times, through Monday night. Hazardous travel through Monday night.

First phase.
Sunday through Sunday night.
The storm will move across the Great Lakes. As it does, it will send a warm front containing moist air across our region. Cold air locked-in on the ground will force the warm air into the upper atmosphere, squeezing the moisture out of it. Still expecting storm to start between 10AM and 1PM. An initial burst of snow is likely in a band of moderate to heavy intensity through about 4PM. There's likely to be 3 to 6 inches by sunset. After about 4PM Snow will likely begin to mix with sleet. This remains noteworthy because sleet does not accumulate as well as snow. After about 10PM Sunday, there should be a notable decrease in the intensity of the snow/sleet, and we still can't completely rule out a brief lull. However, we will begin to enter the second phase around 4AM Monday with steady snow re-developing. Exact snow totals during this first phase will depend on exactly where the afternoon bands of heavy snow develop and on how much sleet mixes in Sunday night, it currently appears that we're likely to be in the 6 to 10 inch range by 7AM Monday.


Second phase.
Early Monday AM through Monday Night.
This phase of the storm will be triggered as the main storm center over the Great Lakes decays and reorganized along the coast. The new coastal storm will allow steady snow to redevelop by about 4AM Monday. A steady snow is expected throughout the day. Like Sunday afternoon, bands of heavier snow may develop. Over the past day, there has been a trend that has heavier bands of snow impacting the mid-Hudson Valley more, and this has resulted in increased snow forecasts. Generally, these higher trends suggest an additional 4 to 8 inches of snow after 7AM Monday, however, it is worth noting that there are few data outliers that suggest up to additional 10 inches on Monday. Because of the potential for heavy bands of snow, and because steady snow is likely to continue for at least 12 hours on Monday, I am choosing to recognize these potential "outliers" in the "extreme range" at this time. Snow is likely to taper off between 7PM Monday and 12AM Tuesday. Confidence in this part of the forecast is moderate. Snow accumulations on Monday will depend on where any heavier bands of snow set up, which is difficult to determine before the storm begins, and is particularly difficult in this storm since there are two phases.


The range of accumulation possibilities with this storm is larger than normal, so it's better to focus on the likely impacts than the exact amounts. The bottomline with this storm remains that heavy snow accumulation will significantly disrupt travel Sunday afternoon through Monday night. Because of the long duration of this storm, and the potential for significant snow amounts, if you must clear walkways, I recommend going out every few hours to do so, opposed to waiting until the end. With temperatures in the upper 20s to low 30s for this storm, it will be fairly wet and the weight will add up by Monday night. At least Sunday evening before bed, and Monday morning when you wake up would be my personal targets to shovel the driveway. I will not be able to post an update tonight, but will do so tomorrow morning.

Next Update
Sunday Morning


Impact Probabilities
Updated: 11:00AM Saturday November 30th
Valid through Friday December 6th

Sunday Monday Tuesday Wednesday Thursday Friday
Delay Nope
Very Low
Very Low Very Low Very Low
Very High
Very Low Very Low Very Low
Very Low Very Low Very Low Very Low Very Low
Snow/ice Very High
Very High
Very Low Very Low Low Very Low
Rain Very Low
Very Low
Very Low Very Low Very Low Very Low
< 32°F
High High Medium Medium
Very Low Very Low
Low Very Low Low
Very Low
Delay, Closing, and Dismissal refer to potential school impacts. All other categories are weather conditions. Impact probabilities offer a general sense of upcoming conditions, but are not specific forecasts.

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