The SA Weather Service (SAWS) has issued a yellow thunderstorm alert for Gauteng as well as parts of Limpopo and Mpumalanga.
Strong winds, severe thunderstorms and possible flooding are expected to take place on Wednesday afternoon going into Thursday morning.
Based on the warning, there is a high risk of minor to severe impact in places over parts of Gauteng. The thunderstorm formations will start in the early afternoon and reach their maximum intensity around 5pm.
The City of Johannesburg has also advised residents to remain indoors and when driving to exercise extreme on the roads.