The second map is how much ice accretion (trees, power lines, sidewalks, all untreated surfaces) from a pro-longed period of freezing rain. The time-frame of freezing rain is highlighted in yellow text on the map for the three zones.
Bottom Line: Up to a quarter of an inch of ice could accumulate along the interstate 95 corridor before a change over to rain during the pre-dawn hours on Tuesday. The damage will have been done by the morning rush hour! What a mess!