SMHI, Sweden's national weather service, had already issued a weather warning earlier today.
The Class 1 warning, the lowest, means there is a substantial risk that thunder and lightning will cause "disturbances in electricity delivery and telephone service."
"As far as I know, this is the first time this year that we have issued a warning for thunderstorms," said meterologist Marcus Sjöstedt.
"This a powerful thunderstorm. A cold front is moving in from the west, which will cause the warm and moist air to rise; that causes heavy clouds to really gather," says meterologist Sjöstedt.
When the storm later shifts to the northeast the rain will be lighter and the risk of thunder and lightning will diminish.