13 Jun 2023 | 11:52 PM UTC
South Africa: Adverse weather forecast across southern regions through at least June 15
Severe weather forecast across parts of southern South Africa through June 15. Possible flooding and associated disruptions.
Event
Heavy rainfall and thunderstorms are forecast across parts of the Eastern Cape, southern Northern Cape, and Western Cape provinces through at least June 15. Heavy downpours in affected regions could trigger flooding in low-lying areas, as well as transport, business, and utility disruptions.
As of early June 14, the South African Weather Service has issued the following weather warnings across the affected area:
Orange Level 6 (of 10) Disruptive Rain Warnings: Breede Valley, City of Cape Town, and Witzenberg municipalities
Yellow Level 2 Disruptive Rain Warnings: most of western Western Cape Province.
Yellow Level 2 Damaging Waves Warnings: the coastal areas of the affected area
Yellow Level 2 Damaging Winds Warnings: most of the affected area
Officials could update and possibly extend the coverage of weather alerts over the coming days.
Sustained heavy rainfall could trigger flooding in low-lying communities near rivers, streams, and creeks. Urban flooding is also possible in developed areas with easily overwhelmed stormwater drainage systems. Sites located downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides are possible in hilly or mountainous areas, especially where heavy rainfall has saturated the soil.
Authorities could issue mandatory evacuation orders for flood-prone communities over the coming days. Disruptions to electricity and telecommunications services are possible where significant flooding or landslides impact utility networks.
Floodwaters and debris flows may render some bridges, rail networks, or roadways impassable, impacting overland travel in and around affected areas. Ponding on road surfaces could cause hazardous driving conditions on regional highways. Authorities could temporarily close some low-lying routes that become inundated by floodwaters.
Severe weather could also trigger flight delays and cancellations at airports across the affected region. Flooding could block regional rail lines; freight and passenger train delays and cancellations are likely in areas that see heavy rainfall and potential track inundation.
Localized business disruptions may occur in low-lying areas; some businesses might not operate at full capacity because of flood damage to facilities, possible evacuations, and some employees' inability to reach work sites.
Advice
Monitor local media for weather updates and related advisories. Confirm all transport reservations and business appointments before travel. Reconfirm the status of road routes before travel. Make allowances for localized travel delays and potential supply chain disruptions where flooding has been forecast. Do not drive on flooded roads. Charge battery-powered devices in the case of prolonged electricity outages.
