Heavy rain washed across the Triangle on Monday morning, sometimes dumping 1 to 2 inches in an hour and causing the usual mess of highway smash-ups during the morning commute.
There were no reports of serious injuries in the crashes that peppered the interstates.
A Raleigh police officer was involved in one mishap on the Interstate 440 Beltline, and two Wake County school buses were in minor accidents in Apex and Raleigh.
The National Weather Service said rainfall rates of an inch per hour and more were common enough to cause street flooding around the area.
Raleigh-Durham International Airport recorded 0.98 inches of rain between 7 a.m. and 8 a.m. and a total of 1.44 inches between 2 a.m. and 8 a.m.
A volunteer weather observer in Cary reported rain was falling at the rate of 4.6 inches per hour at one point shortly before 7 a.m.
In Apex, school officials said, a car hit the back end of a Wake County Public School System bus at U.S. 64 and Lake Pine Drive. None of the students on the bus at the time were hurt.
In Raleigh, a bus hit a parked car at Lawrence and Sierra drives. Students on that bus were unhurt.
The Raleigh police officer was on his way to a shooting call on New Bern Avenue when the accident happened, police said.