Sunday's rain is expected to become Monday's sleet and snow.
It's now even more likely that central North Carolina will see a wintry mix of light snow and sleet accumulation on Monday, the National Weather Service reported Sunday.
The weather will start off as rain early Monday — from a third to a full inch of rainfall across central North Carolina.
An increased probability of temperatures right at freezing for up to a few hours on Monday afternoon and evening during the rain could freeze that precipitation and lead to about an inch of snow and sleet accumulation over parts of the northern Piedmont, mainly north and west of Interstate 85.
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A winter weather advisory was expected to go into effect on Monday from 8 a.m. to 8 p.m. in parts of northern Piedmont counties in central North Carolina, including Durham and Orange counties, the weather service reported Sunday. A winter weather advisory means roads will be covered in wet snow and visibility will be limited for some periods of time.
Up to two inches of snow or sleet are possible in the advisory area. If the storm system intensifies, locally higher accumulation is possible.
South of I-85, there's an expanded possibility for a trace of snow and sleet accumulation, up to a patchy dusting.
Any snow that does build up probably won't be the best kind for playing in. It'll be wet and mixed with frozen rain, the weather service said. Accumulation should be mostly on grassy or elevated areas, since the ground is still warm enough to promote melting.
Driving could become hazardous on Monday afternoon and into the evening, and could affect morning commutes on Tuesday as isolated slushy conditions are possible, especially on elevated roads, bridges and overpasses.
Patchy black ice is possible Tuesday as temperatures fall to or slightly below freezing by the morning.
The rain will turn to a mixture of sleet and snow on Monday during the midday to afternoon hours, the weather service reported Sunday. The precipitation will likely transition to all snow by the afternoon and early evening.
High pressure to the north and low pressure passing by to the southeast will bring cold air into north and central North Carolina. How quickly the colder air arrives through a deep layer of the atmosphere, along with how fast and hard the rain falls, will determine timing and duration of any sleet and snow and how much accumulates.
Any rain, sleet or snow is expected to end by mid to late evening on Monday.