The ABC11 Accuweather Team says First Alert Doppler XP showed three inches in many areas with even more in small locations.
Several roads and bridges were underwater after rain-swollen creeks flowed over their banks.
Despite fast-moving water covering part of Richardson Road in Apex, there were numerous people who drove through flooded roads.
"I saw a lot of SUVs trying to go through, it was pretty impressive," Apex resident Trevor Boyle said. "It's incredibly dangerous to try and cross the road. Six inches of water can sweep away almost any passenger vehicle."
Boyle says when he heard about the flooding, he drove over and couldn't believe his eyes.
"The water got up to probably about eight inches over the road," he said.
It was a similar sight at Beaver Creek Bridge on Kelly Road. The bridge was under water and closed to traffic.
Resident Sean Travers says he initially thought it'd be a good idea to cross by foot, but then quickly reconsidered.
"We're down on Kelly Road … it's flooded like two feet over the road and I mean there's so much water everywhere," he said.
The same storm closed James Street between East Williams Street and South Hughes Street for half an hour in Cary due to storm drainage flooding on roadway.
By Tuesday evening, roads were reopened and the water was receding.
The soaking summer storm also caused some damage keeping crews busy cleaning up after a tree came crashing down on Green Level Church Road in Apex.
The pounding rain also made for a busy day for firefighters who were called to a house at Haddon Hall Drive, because of a lightning strike. It is unclear how much damage the house sustained.