Residents of Mandurah were assessing the damage on Monday morning after a freak storm turned their suburbs into a winter wonderland, with hail blanketing Meadow Springs and Greenfields on Sunday evening.
Lightning and thunder hit large parts of the city, but a localised storm dumped enough hail on the local areas to turn them white.
It is the second big electrical storm to hit Mandurah in as many days.
Residents reported of hail stones the size of golf balls.
Damage to cars and property was reported in Meadow Springs and as far inland as Pinjarra.
Some residents were reporting flash flooding with water knee deep in parts of Meadow Springs.
The Bureau of Meteorology issued a severe thunderstorm warning about 9pm, with radar imagery showing a line of thunderstorms over coastal suburbs of Perth south of Swanbourne.
The State Emergency Services responded to 29 calls calls for help overnight, mainly in Meadow Springs.
Severe thunderstorms were likely to produce heavy rainfall that may lead to flash flooding and large hailstones in the warning area over the next several hours, the bureau said.
"This weather is not unusual for this time of year, but could damage homes and make travel dangerous," a statement said.
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