Bolvia: Adverse weather forecast to cause further flooding across the country through at least Dec. 26

Event

Further heavy rainfall and thunderstorms are forecast across much of Bolivia through at least Dec. 26, which will likely exacerbate the situation in many areas already experiencing floods from previous downpours. As of Dec. 22, the National Meteorological and Hydrological Service (SENAMHI) has issued a red alert for rising river levels (the highest on a three-tier scale) for the Yapacani, Pirai, Grande, and Surutu rivers and their tributaries in Santa Cruz Department, as well as for the Mizque River and its tributaries in Cochabamba Department. Orange alerts are in place for dozens of other rivers in La Paz, Santa Cruz, and Cochabamba departments. SENAMHI warns that the overflowing rivers will threaten towns in the vicinity of the rivers. Officials could update and possibly extend the coverage of weather alerts over the coming days.

Days of heavy rainfall have led to rivers overflowing in seven of Bolivia's nine departments. Structural damage has been reported in at least 18 municipalities across Chuquiasca, Cochabamba, La Paz, and Tarija departments. Eight fatalities have been reported across the country in recent flooding and thousands of families have been displaced. The flooding has destroyed over 1,000 hectares (2,471 acres) of crops and many routes across the country have been made impassable.

Hazardous Conditions
Sustained heavy rainfall could trigger further 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 the soil has become saturated by heavy rainfall.

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.

Transport
Floodwaters and debris flows may render some bridges, rail networks, or roadways impassable, impacting overland travel in and around affected areas. A bridge in Mairana, Santa Cruz Department, collapsed due to flooding; moreover, the Pirai River, which is under red alert, passes close to the city of Santa Cruz. 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 regional airports. 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. 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.

Resources

Bolivian National Meteorological and Hydrological Service (SENAMHI) (Spanish)