Local emergency services have already been called to two jobs on the South Coast with more bad weather expected over the Fleurieu and Kangaroo Island tonight.

At about 3pm today SES and MFS personnel responded to flooding in McKinley Street in Victor Harbor that was threatening local businesses

The SES was also called to help a resident in Hindmarsh Valley who had water entering their home through the ceiling.

The Bureau of Meteorology has issued a Severe weather warning for Fleurieu and KI tonight.

The warning says strong northwest to westerly winds averaging 50 to 60 km/h with DAMAGING WIND GUSTS in excess of 90 km/h, are possible ahead of and with the cold front on Saturday evening and overnight.

There is also a small chance of locally DESTRUCTIVE WINDS with peak gusts in excess of 125 km/h associated with isolated tornadoes over the southern parts of the Fleurieu Peninsula, Kangaroo Island, and southern coastal parts, this evening.

If severe thunderstorms capable of producing tornadoes are detected, a separate Severe Thunderstorm Warning will be issued by the Bureau.

The damaging wind gusts are expected to ease over low lying areas early Sunday morning, but may continue about Mount Lofty Ranges and southern Flinders Ranges through Sunday.