Weak Tornado Confirmed in Free State by South African Weather Service

On Monday afternoon, a tornado was spotted on farmland near Heilbron in the Free State region. The South African Weather Service (SAWS) has confirmed this unusual weather event. According to officials, several thunderstorms grew more intense in the area starting from the afternoon, which created conditions suitable for tornado formation.

Lehlohonolo Thobela, a forecaster from SAWS, explained, “The tornado occurred between 3 PM and 4 PM, influenced by gusty winds, moisture, and other atmospheric conditions.” This tornado was classified as an EF0 on the Enhanced Fujita scale, which measures tornado intensity. An EF0 tornado is considered the weakest, with wind speeds ranging from 105 km/h to 137 km/h.

Fortunately, as the tornado formed in an open field, no damage or injuries were reported.

Understanding Tornado Formation in South Africa

To give more context, Thobela elaborated on the science behind tornadoes in South Africa. Research has shown that specific weather conditions—such as moist air, low-level shear, and atmospheric instability—can lead to the development of tornadoes in the Highveld, Free State, Mpumalanga, and KwaZulu-Natal regions. These areas are known as climatological “hotspots” for tornado activity.

Historical data indicates that a significant number of tornadoes have been reported in provinces like Gauteng, Free State, and parts of Mpumalanga. In fact, there is a notable “tornado belt” in the eastern provinces, where tornado activity is especially high.

Most tornadoes in South Africa occur during the summer months, particularly between November and March. However, it’s interesting to note that they can also manifest during spring (September and October) and late summer, proving that the presence of warm, moist air combined with cooler atmospheric triggers plays a crucial role in tornado development.

Thobela pointed out that a significant tornado event analyzed in December 2017 in the Highveld showed similar conditions that contributed to the tornado sighting in Heilbron. These include strong low-level moisture and notable wind shear.

Tornado Characteristics

Research conducted on left-turning supercells (a type of storm that can produce tornadoes) in the Highveld found these systems are most common during October and November, which marks the early period of the convective season in South Africa. Generally, these supercells have an average lifespan of about one hour and twelve minutes. They typically travel at a horizontal speed of around 41 km/h, often moving from the southwest and shifting direction as the season progresses.

Topography also plays a significant role in where these supercells develop. The unique geographical features of areas like eastern Mpumalanga and the Highveld help shape the paths tornadoes can take.

The interaction of terrain, moisture, and wind shear is vital for understanding why tornadoes cluster in certain locations. This phenomenon affects the severity and frequency of tornadoes experienced in South Africa, particularly in the Highveld region.

In summary, while the recent tornado in Heilbron was classified as weak and no damage was recorded, it serves as a reminder of the intriguing and complex weather patterns that can occur in South Africa. The atmosphere’s conditions play an important role in the development of tornadoes, emphasizing the need for continued research and awareness in this area.

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Original Text – https://www.sowetan.co.za/news/2025-11-25-saws-confirms-weak-tornado-in-free-state/