The Department of Fire and Emergency Services have released a warning to residents living around Salmon Gums and Esperance.
DFES has said residents should take action and stay safe with thunderstorms to come.
This weather is not unusual for this time of year, but could damage homes and make travel dangerous.
Around 4am on February 19 the Bureau of Meteorology observed severe thunderstorms between Salmon Gums and Esperance.
The bureau have advised the storms are likely to ease for a period during Monday morning, but are likely to be active again late morning and during the afternoon.
Severe thunderstorms are likely to produce damaging winds and heavy rainfall that may lead to flash flooding in the warning area.
Locations which may be affected include Esperance, Norseman, Israelite Bay and Salmon Gums. Storms could cause damage to homes and property.
Heavy rain has already been recorded with Cascade NW receiving 28mm of rain between 18:30pm and 19:30pm Sunday, February 18.
Scadden recorded 32mm of rain between 11:00pm and midnight Sunday.
Esperance airport recorded 28mm of rain between midnight and 1am Monday.
Cascade NE recorded 65mm of rain between 2:40am and 3:40am Monday.
Since 9am Sunday the recorded rainfall totals are 106mm Cascade NE, 85mm Scaddenand 65mm Grass Patch.
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.
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.
Exercise extreme caution on South Coast Highway in both directions 10 to 15 kilometres west of Munglinup Great Southern.
The Shire of Esperance has advised Boydell Road will be closed between Cascade Road and Dwyer Road until further advised due to water over the road.
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.
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 or listen to news bulletins.