South Sudan: Severe weather likely to affect much of the country through late 2021; flash flooding and travel delays likely

Event

Heavy rainfall and flooding are forecast to continue across South Sudan through late 2021. Ongoing heavy rain resulting in flash flooding has affected at least 700,000 people nationwide as of Oct. 23. Jonglei and Unity states have been significantly affected. Related damage to infrastructure, including roads and bridges, has been reported.

Associated disruptions are almost certain, including impassable roads in affected areas.

Hazardous Conditions
Sustained heavy rainfall could trigger further flooding. Due to poor stormwater management in some areas, even minor rainfall accumulation could quickly result in episodes of flash flooding.

Transport and Utilities
Floodwaters could render some bridges or roadways impassable, impacting overland travel in the affected area. Ponding on road surfaces could cause hazardous driving conditions.

Disruptions triggered by inclement weather and resultant hazards, such as flooding, could persist well after conditions improve - it could take days for workers to clear debris after floodwaters recede. If there is severe damage to infrastructure, repair and reconstruction efforts may exacerbate any residual disruptions. Electricity and telecommunications services outages are likely where significant flooding or landslides have occurred.

Health
The threat of disease outbreaks cannot be discounted in the coming days and weeks. Backflow from drains that has mixed with floodwaters can become trapped in open areas when inundations recede. These stagnant pools often become a breeding ground for mosquitoes and bacteria, increasing insect and waterborne diseases.

Advice

Monitor local media for weather updates and related advisories. Confirm all transport reservations and business appointments before travel. Make allowances for localized travel delays, as well as potential supply chain disruptions, where severe weather has been forecast. Do not drive on flooded roads. Charge battery-powered devices in case of prolonged power outages.