Residents in parts of the Gascoyne, Central West and Central Wheatbelt are being urged to prepare for potentially dangerous thunderstorms today.
The Bureau of Meteorology has forecast severe thunderstorms this afternoon and evening, which could produce damaging winds, hailstones, heavy rain and flash flooding.
The warning applies to people living between Wongan Hills, Moora, Mullewa, Murchison, Cue and Mount Jackson.
Residents are being told the weather could damage homes and make travel dangerous.
The Department of Fire and Emergency Services is advising people to weigh down loose objects, prepare an emergency kit, keep animals safe and move vehicles undercover.
Isolated showers and thunderstorms are also forecast for the northern and eastern suburbs of Perth later today, with winds easterly of 25-35km/h moving east to south-easterly in the middle of the day then east to north-easterly in the evening.
Thunderstorms are also expected in the Perth metropolitan area tomorrow.