The Cape of Storms lives up to its nickname

Severe storms in the south-western Cape

Heavy storm clouds hang threateningly over Simonstown

Severe storms, linked to cold front and low-pressure systems, moving from west to east, occur mainly during the winter months in the south-western Cape. A frontal system or an inland cut-off low pressure system may have a surface wind gusting up to 100 kph or higher and may cause structural damage – roofs are blown off and trees uprooted. These storm systems are also intense rainfall producers and flooding (rivers bursting their banks and widespread urban and seepage flooding) can occur. Cold, including snow on the higher mountains, may also occur. Those living in low-cost housing or informal settlements are the most vulnerable.

Hailstorms may also occur when cumulonimbus clouds are present. Agriculture, gardens, buildings, vehicles, people, animals and birds may be affected.

Sea Surges and high waves may also cause some beach erosion and boat damage.  

Waves crash into the wall along the promenade along Sea Point Pavilion.

Gale-force winds

Gale-force winds may blow for a number of consecutive days during the summer months. Known as the “Cape Doctor”, these south-easterly or southerly winds can reach up to Gale-force in strength, usually blowing on clear, hot and sunny days and they are characterised by the “table cloth” over Table Mountain and the Hottentots-Holland mountains to the east of Cape Town. Caution needs to be taken, especially when walking in the Cape Town CBD and other areas where the wind may be unpredictable!

These windy conditions are also favourable for runaway fires that could easily become major blazes. The Fire Danger Index of a Red Warning for the Cape Metropole will most probably be in force during days with a Gale-force wind forecast. The general public are requested to apply fire-safe practices during these weather conditions – it is advisable not to make fires during this time, but especially not in open areas where the risk of a wildfire may be very high.

Precautionary measures to prevent wind damage

• Install straps or additional clips to your roof to secure it to the frame structure, in order to prevent roof damage.
• Trim trees and shrubs around your home.
• Determine how and where to secure your boat, should you own one.
• Maintain exterior walls.
• Protect windows and doors with covers or wind shutters.
• Reinforce double entry doors.
• Reinforce or replace damaged garage doors.
• Secure metal siding and metal roofs.
• Secure built-up and single-ply roofs.
• Brace gable-end roof framing.
• Ensure adequate insurance cover for possible storm damage.
• Motorists must watch out for fallen trees, branches and broken power lines along roadways.
• Exercise extreme caution in mountainous areas.