The warning applies to several counties in southern Sweden, including Östergötland, and SMHI warns that in connection with the thunderstorm there may be rainfall-like rain and very hard wind gusts.
According to SMHI, the distribution of the heaviest thunder is uncertain.
In the clip you can see pictures from a previous real thunderstorm over Norrköping:
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See how the lightning goes out in central Norrköping Photo: Ulf Larsson / SVT