A warm front will be moving into the area tomorrow and bringing another round of precipitation. We still have an arctic airmass in place which will give way to much milder temperatures (Tuesday, Wednesday). As precipitation comes in, the upper atmosphere will warm, but since cold air is heavier than warm air, the cold air at the surface will take a little bit longer to warm. This process, known as warm ait advection will possibly lead to an icy situation Monday. The timing and extent to which how long it takes the cold air to retreat will all be determining how long icy conditions could stay around.
Areas to the south will have little to no icy time while areas to the north will be a different story. Typically, NW NJ and the Pocono gets quite icy during these setups. Areas further south from Philly to Trenton tend to switch over pretty quickly. Between Trenton and the before-mentioned NW NJ and Pocono region, that will be where the real battle sets up for how long it takes to switch over to all rain. Precipitation makes it in for the morning hours. Many areas will start as snow and then switch over to ice and then rain. Areas will start from south to north.
After this bout with weather, we will have a nice thaw coming for Tuesday and Wednesday. The pattern will reload and it will return cold towards the end of the week.
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