Guidance over the last 24 hours has trended a bit snowier overall, but still favors the interior parts of the state for this winter storm. An arctic front will be passing through the state starting early Tuesday morning in our western counties and by the late afternoon for our eastern counties. The arctic front itself will produce a period of snow and/or a wintry mix before a low pressure forms along the front by the mid-morning hours Tuesday. This will allow for precipitation to be enhanced, especially across Eastern Pennsylvania.

Temperatures will be marginal ahead of the front, meaning most areas will be around 32 degrees. This will allow for some areas to start off as a wintry mix before changing over to all snow. For the snow lovers across Southwest PA, this will once again not be your storm. Plain rain to brief snow is expected across those areas. Below is a look at our future radar for 1:00 AM Tuesday morning:

This area of precipitation will continue to push east as we progress into the mid-morning hours. Below is a look at 7:00 AM Tuesday morning:

Your morning commute to work and school will be impacted across Central Pennsylvania. Expect slow travel and plenty of school delays and/or cancellations. The snow that does fall early on in the storm, will be more of a wet snow as temperatures remain around 32 degrees. However, during the middle and end of the storm, temperatures will drop into the 20s which allow for the snow to become fluffier. This means snow ratios will be greater than 10:1 for interior parts of the state. Interior areas of Pennsylvania will likely see snow ratios in the 15:1 range. To put it simple, conditions during the middle and end of the storm will make it easier for the snow to accumulate faster. By 1:00 PM Tuesday, the coastal low is beginning to form along our front and is really beginning to enhance precipitation over the eastern half of our state:

Because the coastal low pressure begins to enhance precipitation, it will take longer for the snow to taper off. We do not anticipate the snow to taper off for Eastern Pennsylvania until after 7:00 PM Tuesday evening:

 

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FIRST CALL SNOWFALL FORECAST FOR TUESDAY’S STORM

Area A: Snowfall accumulations of 4 – 7″ expected. Hazardous travel likely Tuesday.

Area B: Snowfall accumulations of 2 – 4″ expected, with isolated amounts up to 6″ possible. Hazardous travel anticipated Tuesday.

Area C: Snowfall accumulations of 1 – 2″ expected, with isolated amounts up to 3″ possible. Untreated surfaces will become slushy Tuesday.

Area D: Snowfall accumulations of <1″ expected.

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