Key Takeaways
- A cut‑off low‑pressure system will move from the western interior eastward across South Africa from Thursday 3 Sept to the weekend, bringing cold, wet, windy weather.
- The Western Cape and Northern Cape will feel the first impacts, with temperatures dropping below 10 °C on high ground, disruptive rain, and damaging winds.
- Yellow Level 4 warnings are in place for disruptive rainfall (Overberg & Garden Route), damaging winds (Namakwa, Cape Winelands, Central Karoo, Little Karoo), and dangerous coastal waves (Alexander Bay to Plettenberg Bay).
- As the system moves east, severe thunderstorms with heavy rain, strong winds, lightning, and hail are expected over the Free State, North West, Gauteng, and later Mpumalanga, KwaZulu‑Natal, and possibly southern Limpopo.
- Snowfall is possible on the Drakensberg Mountains of the Eastern Cape and may extend into Lesotho’s high‑lying areas, creating hazardous driving conditions.
- The public is urged to monitor official forecasts, avoid flooded roads, secure outdoor objects, protect livestock, and stay clear of isolated trees and metal structures during thunderstorms.
Overview of the impending weather system
South Africa is poised for a notable shift in weather this week as a cut‑off low‑pressure system develops over the western interior on Thursday, 3 September. The system is forecast to drift eastward across the country over the weekend, ushering in a combination of cold temperatures, widespread rainfall, strong winds, and the potential for severe thunderstorms, snowfall, and dangerous coastal conditions. The South African Weather Service (SAWS) has highlighted that the system’s progression will affect multiple provinces, necessitating heightened preparedness from residents, farmers, and authorities alike.
Western Cape and Northern Cape initial impacts
The first brunt of the system will be felt in the Western Cape and Northern Cape from Thursday into Friday. Cold, wet and windy conditions are expected, with maximum temperatures possibly remaining below 10 °C in high‑lying areas. Rainfall could become disruptive, particularly over the south‑eastern parts of the Western Cape, raising the risk of localized flooding. In the Northern Cape, damaging winds are anticipated over Namakwa and extending into the Cape Winelands, Central Karoo and Little Karoo, while strong to damaging interior winds may also affect the south‑western and southern coastal zones.
Yellow Level 4 warnings for rain, wind and waves
SAWS has issued a Yellow Level 4 warning for disruptive rainfall over the Overberg and Garden Route districts on Thursday, warning of flooding of roads and settlements and major traffic disruption. A separate Yellow Level 4 warning covers damaging winds for Namakwa in the Northern Cape and parts of the Cape Winelands, Central Karoo and Little Karoo from Thursday afternoon into Friday. Additionally, coastal areas between Alexander Bay and Plettenberg Bay are under a Yellow Level 4 warning for damaging winds and waves, with wave heights expected to reach approximately 4.5 to 5.5 metres, posing risks to navigation, ports, harbours and coastal infrastructure.
Severe thunderstorms in Gauteng, North West and surrounds
As the low‑pressure system moves eastwards, temperatures will fall across the central and eastern interior, accompanied by scattered to widespread showers and thundershowers. The Free State, Gauteng, Eastern Cape, KwaZulu‑Natal and eastern parts of the North West could experience windy conditions from Friday into Sunday. SAWS indicates a signal for severe thunderstorms over parts of the Free State, North West and Gauteng from Friday afternoon into Saturday evening, with the risk shifting eastward on Sunday to potentially affect Mpumalanga, KwaZulu‑Natal and southern Limpopo. Where these storms occur, they may bring heavy downpours, strong winds, excessive lightning and hail, increasing the danger of flash flooding and property damage.
Snowfall prospects in the Eastern Cape and Lesotho
The cold air mass associated with the system raises the possibility of snowfall in high‑lying areas. SAWS notes that snow is possible over the Drakensberg Mountains of the Eastern Cape on Friday morning, with the system potentially extending into the high‑lying regions of Lesotho. Motorists using mountainous routes and high‑lying passes are urged to exercise extreme caution due to rapidly deteriorating conditions, reduced visibility and hazardous driving surfaces. Travelers should consider postponing non‑essential trips through these areas until conditions improve.
Coastal hazards from damaging waves
Coastal zones are not exempt from the system’s impact. The Yellow Level 4 warning for damaging winds and waves between Alexander Bay and Plettenberg Bay anticipates wave heights of roughly 4.5–5.5 metres. Such conditions can threaten maritime navigation, compromise port operations, and endanger coastal activities and infrastructure. Beachgoers, fishermen and maritime operators should heed advisories, avoid venturing out to sea, and secure vessels and equipment against strong surf and wind‑driven spray.
Public guidance and preparedness measures
SAWS has urged the public to monitor official forecasts and warnings as the system evolves, especially in zones vulnerable to flooding, strong winds, thunderstorms and cold exposure. Recommendations include avoiding crossing flooded roads, bridges or streams; securing loose objects outdoors; and refraining from seeking shelter under isolated trees or near metal structures during thunderstorms. Small‑stock farmers are advised to provide adequate shelter for livestock, particularly in areas expecting very cold, wet and windy conditions. The weather service emphasizes the importance of staying alert to updated forecasts, advisories and warnings as the system’s movement and intensity become clearer.
Conclusion
The approaching cut‑off low‑pressure system promises a multi‑faceted weather event for South Africa, encompassing cold, wet and windy conditions in the west, disruptive rain and damaging winds in the Western and Northern Cape, severe thunderstorms with hail and lightning across the central interior, potential snowfall in the Drakensberg and Lesotho, and dangerous coastal waves along the southern seaboard. By staying informed through SAWS updates and following the outlined safety precautions, residents, farmers, travelers and maritime operators can mitigate risks and navigate the challenging conditions expected from Thursday through the weekend.
Source: IOL News