"The torrential rain sent everyone scrambling for cover," said the CBC's Catherine Harrop from Fredericton. "It lasted for about 20 minutes before the clouds cleared away, and a blue sky reappeared."
Police in Fredericton were forced to block off a downtown street when the rain flooded the road.
"Cars driving down an otherwise clear one-way street were suddenly confronted by a large pool of water," said Harrop. "Some stopped and tried to back up, others plowed through."
Half the homes regained electricity by 7 p.m. Saturday. But people in Bouctouche, Shediac, Moncton and Sussex were still without power at that time.
The power failure added to another incident earlier in the day, when a squirrel is believed to have sparked a fire at a New Maryland substation. That shut down the power for more than 5,000 homes and businesses in the area.
The storm also touched down in Nova Scotia, where a lightning bolt sparked a fire in a New Glasgow home.
There were no injuries reported from that fire.