At 4am on July 2, the Bureau of Meteorology advised an approaching rain band and cold front will affect southwest WA during Monday.
The system will bring the potential for heavy rainfall, damaging winds and abnormally high tides.
Conditions will ease over southern parts during Monday afternoon and early evening but a second developing cold front and low pressure system will affect the southwest early Tuesday morning.
Heavy rainfall that may lead to flash flooding will develop southwest of a line from Bunbury to Walpole during Monday morning as the rain band moves through.
Damaging winds to 110 kilometres per hour which could result in damage to homes and property are possible southwest of a line from Bunbury to Walpole until late Monday afternoon, most likely in exposed coastal areas.
Tides between Shark Bay and Cape Leeuwin are likely to rise above the normal high tide mark with very rough seas and potential flooding of low-lying coastal areas around the time of high tide until Monday afternoon, particularly within Geographe Bay.
This is typical weather for this time of the year but heavy rain and winds may cause damage to property and make road conditions hazardous.
Locations which may be affected include Busselton, Bunbury, Collie, Geraldton, Mandurah, Manjimup, Margaret River, Moora and Perth.
A wind gust to 106 kilometres per hour was recorded at Cape Leeuwin at 3.22am Monday morning.
Further cold fronts and a low are expected to affect southern and southwest parts of WA over the coming days with the potential for further severe weather on Tuesday morning and during Wednesday.
WHAT TO DO:
DFES advises you to:
If outside find safe shelter away from trees, powerlines, storm water drains and streams.
Close your curtains and blinds, and stay inside away from windows.
Unplug electrical appliances and avoid using landline telephones if there is lightning.
If there is flooding, create your own sandbags by using pillow cases filled with sand and place them around doorways to protect your home.
If boating, swimming or surfing leave the water.
Do not drive into water of unknown depth and current.
Slow down, turn your lights on and keep a safe distance from other drivers.
Be alert and watch for hazards on the road such as fallen powerlines and loose debris.
If it is raining heavily and you cannot see, pull over and park with your hazard lights on until the rain clears.
Take care in areas that have been flooded and be careful driving on gravel roads as surfaces will be slippery and muddy, and vehicles could become bogged.
People are being urged to do what they can to help themselves, if it is safe to do so, before calling the SES for assistance.
ROAD CLOSURES AND CONDITIONS:
Some roads may be closed
Take extra care on the roads and do not drive into water of unknown depth and current.
Road information may also be available by calling Main Roads WA on 138 138 or visiting www.mainroads.wa.gov.au or your local Shire.
WHAT EMERGENCY SERVICES ARE DOING:
DFES is monitoring the situation.
Emergency services have answered more than one calls for help since 10pm last night.
IF YOU NEED ASSISTANCE:
If your home has been badly damaged by a storm, call the SES on 132 500
In a life threatening situation call 000
After a storm SES volunteers make temporary repairs to homes that have been badly damaged, such as roofs that have been ripped off or large fallen trees on homes or cars. Please contact your insurance company to organise permanent repairs.
KEEP UP TO DATE:
Visit www.emergency.wa.gov.au, call 13 DFES (13 3337), follow DFES on Twitter: https://twitter.com/dfes_wa, Facebook: https://facebook.com/dfeswa/, listen to ABC Local Radio, 6PR, or listen to news bulletins.