7:00 AM Update
I've made a minor adjustment to my call.
I'm now thinking Southern DE and Cape May CO NJ will also receive 2"-4" of snowfall, I had this zone at 1"-2".
Heavier Precip in this region and a colder profile should be enough that these areas also get 2"-4" of snowfall. It's not out of the question that parts of central and northern DE into parts of SJ could see a few spots near 5".
Snow and sleet should begin this evening between 9:00 PM and midnight, then all snow moderate at times, during the overnight hours. All snow should end between 6:00 AM and 9:00 AM Tuesday morning. Skies will become Partly Sunny by late morning, but continued cold with Highs on Tuesday in the low to mid 30's. My official call stands and is below from Sunday evening.
Issued Sunday @ 5:30 PM
My Call and Thoughts.
Discussion and Forecast for The Delaware Valley.
A Series of low pressure systems with move east to the Mid-Atlantic Coast through Tuesday morning. The first storm will bring some Mixed Precip and rain for tonight into Monday morning. This first storm system will track from Ohio to near NYC on Monday.
Our second storm system will track further south on a path from SW Virginia to the Delmarva coast. This second storm will have a more favorable storm track for snow and will also have more cold air to work with ! So folks, it looks like accumulating snow is a good bet for Monday night into early Tuesday morning.
Sunday Night into Monday:
(Mixed precip to rain with A Coating to 1" possible)
Some Rain, Sleet and snow will develop during the evening hours and continue overnight. Some areas could see a Coating to 1" of sleet and snow overnight. For the far Northern suburbs of PHL, and into the Lehigh Valley, 1"-3" of snow and sleet can be expected for Tonight into Monday morning. Lows tonight will be in the low to mid 30's.
On Monday all mixed precip will change to some light rain during the early morning hours and light rain should taper off by early afternoon. Highs on Monday will be in the Upper 30's to low 40's.
Monday Night into Early Tuesday AM
(Accumulating snow likely: A general 2"-4" can be expected)
The second storm for Monday night into early Tuesday morning, will be mainly snow and accumulating snow is likely across the entire Delaware Valley. Our second wave of low pressure will track further south to the Delmarva coast Later Monday night, at the same time, colder air will press south and east. A mixture of Rain, sleet and snow will redevelop during Monday evening, and quickly change to all snow by midnight. Light to moderate snow will fall during the overnight hours and end towards early Tuesday morning.
I'm forecasting a general 2"-4" of snow accumulation for Monday night into Tuesday morning. This includes all of SE PA, Central and Southern NJ, and Northern/Central DE.
A few spots could see up to 5" ! This mainly over parts of DE and Southern NJ.