Emergency services were called to a property on Qually Road property in Lockyer Waters after the woman had been struck by a tree just before 6pm.
Queensland Police said the 70-year-old had life-threatening injuries when they arrived.
“She was declared deceased a short time later,” Queensland Police said in a statement.
“Initial information indicates the woman was walking outdoors when the incident occurred.”
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The Bureau of Meteorology said winds up to 87 kilometres per hour were recorded during the storm.
Hundreds are without power after powerlines came down near Laidley, where a thick blanket of hail came down.
In the Lockyer Valley, 22mm of rain fell in just 10 minutes.