The Bureau of Meteorology has released two severe thunderstorm warnings for the Adelaide area as two separate storm cells cross the greater metropolitan area this afternoon.

Severe thunderstorm activity was detected at 3:20pm near Mount Barker, Meadows, Angaston and Wasleys, and moving ESE towards Gawler, Strathalbyn and Callington by 3:50pm.

A second cell is in the middle of Gulf St Vincent and expected to affect Noarlunga, Hallet Cove and Christies Beach by 3:10pm.

Both storms were capable of producing damaging winds, large hailstones and heavy rainfall which could lead to localised flash flooding.

Heavy rainfall had been recorded in parts of the Barossa Valley, with 24mm registered in 30 minutes at Rowland Flat, and

SES crews attending to repair callouts in the area.

Motorists are warned to take extra care in areas affected by the storm.

People in the areas are advised to secure loose outside items, move vehicles undercover or away from trees, stay well clear of fallen powerlines, not travel through flood waters and stay indoors whilst the storms were passing.

The storms were expected to remain in the warning areas of Adelaide metropolitan, Mount Lofty Ranges, Flinders, Mid North, Riverland, parts of the Murraylands and the North Eastern Pastoral for several hours.

Adelaide, Clare, Murray Bridge, Victor Harbor, Hawker and Jamestown could expect to experience severe weather conditions.