China: Adverse weather forecast across southern regions through at least April 25

Event

Severe weather is forecast across parts of southern China, including Hong Kong and Macau, through at least April 25. Thunderstorms accompanied by heavy downpours, strong winds, lightning, and possible hail are likely to break out across parts of the affected region. As of April 24, the China Meteorological Administration has issued a blue severe convective weather warning (the lowest on a four-tier scale) across parts of the region. Thunderstorms accompanied by strong winds and possible hail storms are possible in parts of eastern Yunnan, southeastern Guangxi, and southwestern Guangdong provinces. Isolated heavy showers producing hourly rainfall amounts of 2-4 cm (0.8-1.6 inches) with localized higher totals are likely across parts of southeastern Yunnan, eastern Guangxi, central and western Guangdong, and central and northern Hainan Island. The Hong Kong Observatory has also issued amber rainstorm warnings (the lowest level on a three-tier scale) and thunderstorm warnings, and the Macau Meteorological and Geophysical Bureau issued a thunderstorm warning signal on April 24. Officials could update and possibly extend the coverage of weather alerts over the coming days.

Hazardous Conditions
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 also possible, especially where heavy rainfall has saturated the soil. Landslides could result in structures being damaged or destroyed. 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 other 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. Freight and passenger train delays and cancellations are possible in areas that see heavy rainfall and potential track inundation.

The disruptive weather will likely cause some delays and cancellations at airports in the affected regions. Authorities may temporarily suspend port operations if strong winds trigger hazardous sea conditions, impacting freight and passenger maritime traffic. Flooding could block regional rail lines; freight and passenger train delays and cancellations are possible in areas that see heavy rainfall and potential track blockages.

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, as well as potential supply chain disruptions, where flooding has been forecast. Do not drive on flooded roads. Charge battery-powered devices in case prolonged electricity outages occur.

Resources

Hong Kong Observatory
Macau Meteorological and Geophysical Bureau