Would love it could make it here as storms or rain not fussy.

A BOY has been hit by lightning in Adelaide's eastern suburbs as a wild storm lashes the Barossa Valley and Adelaide Hills, dumping large amounts of rain and hail.

The boy was hit by the lightning at Kensington Sports Oval, on The Parade, and has been taken to hospital by ambulance.

Bob Charles, who live opposite the over, said he heard a ``loud crack of lightening'' before an ambulance arrived.

``The roof of my garage shook but I didn't take much notice of it,'' he said.

Another neighbour said she later saw a group of boys who had been playing football on the oval gather around an ambulance.

The incident came as significant rain fell across Adelaide's northern suburbs, the Barossa Valley and throughout the Adelaide Hills.

Hail also fell, blanketing many roads.

The rainfall amounts include 24mm in 30 minutes at Rowland Flat and 31 mm in 1 hour at Mt Adam.

Lou Miranda Estate at Rowland Flat was hit with a huge burst of rain and hail for about 20 minutes.

Worker Lisa Miranda said the building had been flooded but the weather had since dried up completely.

"You wouldn't even think it had been raining," she said.

"We had hail pelting probably about the size of 10c pieces.

"Basically it just flooded into our office and into the restaurant.

"We had to send people away because they were starving - it hit right during service."

Lyndoch has had 22mm of rain and Mt Adam in 20mm.

Residents have reported hail the size of 10c pieces.

Deb, from the Lyndoch Hotel, said the hail had turned the hills white and created a winter wonderland.

"It (the weather) came in really quickly and dark and it rained for about 20 minutes," she said.

Josh, from the Bedford Hotel, said there was a "fair bit of hail" and plenty of lightning and thunder.

"There was a pile of rain and water over the top of gutter on the hotel," he said.

"It took me by surprise, I wasn't expecting it."

The Bureau of Meteorology has issued a severe thunderstorm warning for residents in the Playford, Gawler, Barossa, Adelaide Hills and parts of the metropolitan and Mount Barker council areas.

``These thunderstorms are moving towards the south-east. They are forecast to affect Palmer, Hahndorf and the area east of Mount Pleasant by 3:00 pm and Mount Barker by 3:30 pm,'' the warning said.

The bureau said damaging winds, large hailstones and heavy rainfall that may lead to flash flooding are likely.

Another thunderstorm in Gulf St Vincent is forecast to affect Noarlunga, Hallett Cove and Christies Beach by 3:30 pm.