10 Jan 2022 | 01:40 PM UTC
Tonga: Adverse weather forecast nationwide through at least Jan. 13
Severe weather forecast across Tonga through at least Jan. 13. Transport, business, and utility disruptions possible.
Event
Adverse weather associated with Tropical Cyclone Cody, currently tracking to the west of Fiji, is forecast to bring heavy rainfall, strong winds, rough seas, and possible flooding across Tonga through at least Jan.13. Although the storm system is not forecast to pose a direct threat to Tonga, as of late Jan. 10, Tonga Meteorological Services have issued heavy rainfall and flash flood advisories for Tongapatu and Eua, Otu Mu'omu'a, Ha'apai, and Vava'u island groups. Strong wind warnings for land and coastal waters and small craft advisories are also in effect for Tongapatu and Eua and Ha'apai. A heavy damaging swell and gale warning and a small craft advisory are in effect for Telekitonga and Telekitokelau. Further periods of heavy rainfall are forecast across the country through at least Jan. 13. Officials could update and possibly extend the coverage of weather alerts over the coming days.
Hazardous Conditions
The storm could produce rounds of heavy precipitation, strong winds, and isolated thunderstorm activity over Tonga. 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.
Transport
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 regional airports. If strong winds trigger hazardous sea conditions, authorities may temporarily suspend port operations or close beach fronts. 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.
