The fire was reported at the Lucerne on the Lake Park, located at 5877 Lake Street, shortly before 11 p.m.
Smoke initially was reported, and Northshore Fire Protection District responded to the scene.
Battalion Chief Steve Hart said the fire was confined to a bed and a wall in a bedroom.
“The cause was water leaking into an electrical outlet from the storm,” Hart said, with the water causing a short in the outlet, which threw a spark into the mattress.
The fire took about 30 minutes to contain and clean up, he said.
Hart said there were no injuries, and he estimated total damages at about $500.
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