These factors, along with low humidity, have led to the development of widespread frost and very low temperatures.One of the most dangerous threats from this cold spell is the formation of black ice — a thin, nearly invisible glaze of ice on roads, especially on mountain passes, bridges, and shaded areas. Black ice has been reported and is forecast to form in parts of Lesotho, the northern interior of the Eastern Cape, and the southern Free State. Motorists are strongly advised to exercise extreme caution, as black ice can cause severe accidents by catching drivers unaware.In addition to the primary cold front, a secondary cold front has moved over the southwestern parts of South Africa, bringing more rainfall and gusty winds. These conditions are expected to continue into Friday, with isolated showers lingering over the southwestern Cape.Damaging winds and rough seas are forecast along the southeastern and eastern coasts of South Africa, posing risks to marine activities and coastal communities.While interior regions are experiencing freezing to bitterly cold temperatures, areas ahead of the front — including Limpopo, eastern Mpumalanga, northern and eastern KwaZulu-Natal, and eSwatini — remain warm to very hot. This sharp temperature gradient highlights the dynamic and impactful nature of the cold front.Frost is expected to persist and even intensify in many interior areas through Sunday morning, including:- Central and southern Namibia- Southwestern Botswana- Most of South Africa's interior (excluding coastal and northeastern regions)Severe black frost is possible in parts of South Africa, especially in the Free State, Northern Cape, and Karoo interior.