When large and intense weather systems affect the country, tornadoes can occur.

That was according to the South African Weather Service (Saws) after severe thunderstorms affected parts of KwaZulu-Natal resulting in at least two tornado sightings on Monday afternoon.

In a statement issued on Tuesday, Saws said a large weather system, namely a cut-off low, affected large parts of the country since the weekend and was responsible for the heavy rainfall and significant flooding over parts of the Eastern Cape.

Saws said that on Monday, the system moved over the western and central interior of the country and resulted in cold air that invaded the central and western interior. The eastern parts of the country, particularly KZN, experienced warm and moist conditions.