Threat 1 (Late tonight/Tuesday)
An upper-level disturbance just now reaching the Pacific Northwest will move quickly to the Central Plains by later today and then it should push into the northern/central Appalachians by early tomorrow. Even though this system is rather weak, it has enough moisture to result in some accumulating snow on Tuesday in areas to the north of the PA/MD border region with 1-3 inches possible across the NYC metro region and a coating to an inch or so in southeastern PA. Given the possible late night arrival time, there can be some issues for the Tuesday AM commute in the Philly and NYC metro regions. Later in the day, sleet and/or rain can mix in at times and driving conditions should improve as temperatures head to well above the freezing mark.
To the south of the PA/MD border, the precipitation from this weak system will be rather spotty light. Nonetheless, there can be problems for the morning commute in the DC metro region with the possibility that some light freezing rain breaks out towards daybreak with temperatures below the freezing mark. Temperatures will climb to well above freezing later tomorrow so there should be no issues for the Tuesday evening commute in and around the DC metro region.
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