Tonight's event is the first of two waves for the Delaware Valley, with more snow expected to the north of the region. I don't expect much in the way of snow around Philadelphia from round one, with perhaps some sleet pellets or snowflakes mixing in with light rain from time to time. A coating is possible across the northern half of the city but I think the best chances for any coating of snow will generally be Turnpike and north. Any coatings could be on the front end of the event before milder air aloft nudges in and light snow/sleet transitions over to rain.
Trends from this morning suggest a bit more precipitation working across the region. I don't expect any significant accumulations across the city or even in the coating region -- it's still quite possible these areas escape from seeing more than a few flakes or sleet pellets mixing in with a chilly round of light rain. The best chances for any snow will be farther north -- we have 2-4" of snow in the forecast for the Lehigh Valley and areas north of I-78 in Central and North Jersey, including New York City. 3-7" of snow is possible, with isolated higher amounts, across Northern Pennsylvania, west of I-81 and north of I-80. These areas should remain below freezing for a good chunk of the event.
Timing-wise, most precipitation will start up after 9 PM in Pennsylvania, after 10 in New Jersey, with precipitation lasting until 5-8 AM from southwest to north, with a longer duration of precipitation north and northeast of the city.
We still have the second round of the event forthcoming -- that will be on Monday night and could feature a few more inches of snow around town -- we'll update that tomorrow.
More: Track tonight's precipitation
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