The National Weather Service warned that thunderstorms could produce hail up to 2 inches in diameter in some parts of the Triangle on Monday afternoon and smaller pellets Monday evening.
A mid-morning statement from forecasters in Raleigh said the larger hail was possible between 1 p.m. and 6 p.m. in Wake, Chatham, Franklin and Johnston counties and could be accompanied by damaging winds.
In Durham and Orange counties, the statement said, hail could be as much as 1 inch in diameter during the same hours.
The official forecast, however, put the chance of those storms happening at 30 percent.
In the evening, another band of thunderstorms could pass over the area, with possible hail and winds of 60 mph in the western counties and 50 mph in Wake County and eastward.
Tuesday, Wednesday and Thursday were forecast to be bright and clear with clear nights. Daytime temperatures were forecast to be in the high 70s to the low 80s.