China: Adverse weather forecast in southern provinces through at least May 13 /update 2

Event

Heavy rainfall, thunderstorms, and strong winds are forecast across parts of southern China through at least May 13. As of May 11, the China Meteorological Administration has issued a yellow (the second-lowest level on a four-tier scale) rainstorm warning for central and southern Fujian, most of Guangdong, most of Guangxi, southwestern Guizhou, and southeastern Yunnan provinces. The heaviest rainfall is forecast over southern Guangdong and central and eastern, western and southeastern Guangxi with rainfall totals of 10-18 cm (4-7 inches) possible. The heavy rainfall may be accompanied in places by strong winds and thunderstorm activity. Authorities have issued yellow (lowest level on a three-tier scale) landslide warnings over southeastern Guangdong and northeastern Guangxi provinces. Authorities have warned that some small to medium sized rivers in most of Guangdong, central Guangxi, Jiangxi, and Yunnan provinces are likely to flood May 11. Regional and local meteorological observatories in the affected area have issued several weather warnings ranging from blue to red severity (the lowest to the highest levels on a four-tier scale) for heavy rainfall, lightning, thunderstorms, and strong winds across the affected area. Officials could update and possibly extend the coverage of weather alerts over the coming days.

Authorities in Guangzhou, Guangdong Province, have started preparations for the evacuation of residents in vulnerable areas. Officials have advised residents to stockpile enough supplies for two days to to avoid going outdoors. Macau and Zhuhai cities have suspended classes May 11 due to the adverse conditions.

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. Hazardous weather conditions might cause flight delays and cancellations at airports in the affected region.

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 case prolonged electricity outages occur.

Resources

China Meteorological Administration
China Ministry of Water Resources