The South Australian State Emergency Service (SES) has already responded to hundreds of calls for help this morning after a severe storm ripped through the state this morning.

Multiple trees have been brought down, including massive gum trees, which have snapped in half, blocking roads and damaging homes.

One resident in the Elizabeth area told 9News that he heard a loud bang, only to find his roof had collapsed onto his driveway and over his cars.

Wind gusts are expected to reach up to 130km/h. 

The Bureau of Meteorology has issued severe weather warnings as a powerful cold front sweeps across the region, with Victoria and NSW forecast to receive the same polar blast in coming hours.

The weather system will bring damaging winds, showers and snow today and into the weekend.

Elsewhere in South Australiae, gusts are forecast to average 60km/h to 100km/h through the morning.

Conditions are expected to gradually ease from the west during the evening, although may continue into the late evening over the state’s Lower South East.

Communities which may be affected include Adelaide, Port Lincoln, Whyalla, Renmark, Mount Gambier and Ceduna.

A gale warning was issued by the bureau today for a huge stretch of coastal waters, including the Adelaide metropolitan area.

The SES is advising people to leave their boats at home for the next couple of days.

Residents in large parts of Victoria, NSW, the ACT and Tasmania are also being warned of powerful damaging winds through today and into the weekend as a strong cold front takes hold.

The bureau says a strengthening north-westerly airstream will bring gusts of up to 100km/h to elevated areas.

Heavy snowfalls and blizzard conditions are forecast for alpine areas, including parts of the NSW Snowy Mountains district above 1400 metres and Victoria’s Eastern Ranges above 1200 metres.

For the capital cities, Adelaide is heading for a maximum temperature of 13 degrees, Melbourne 14 degrees and Sydney 21 degrees.

But forecasters warn the wind chill will make it feel much cooler in many parts.