Thailand, Cambodia: Adverse weather forecast across Cambodia and northern and central Thailand through at least May 2

Event

Heavy rainfall, thunderstorms, strong winds, and possible hail are forecast across Cambodia and northern and central Thailand through at least May 2, bringing a threat of flash flooding and overflowing rivers across the region. As of April 28, the Thai Meteorological Department has warned of thunderstorms with gusty winds and hail over the North, Northeast, East, and Central regions including Bangkok and its vicinity. Residents are advised to stay indoors, take more caution during travel, and be beware of falling trees and flying debris.

The Cambodia Department of Meteorology has issued yellow (lowest level on a three-tier scale) thunderstorm and high wave warnings across Cambodia April 29. Orange thunderstorm and high wave warnings are in place across most of the country April 30.

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 or a lack of 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. Disruptions to electricity and telecommunications services are possible where significant flooding, landslides, or strong winds impact utility networks.

Transport
Floodwaters and debris flows could render some bridges, rail networks, or roadways impassable, impacting overland travel 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 intermittent flight delays and cancellations at airports across the affected region, though these are unlikely to be severe or prolonged. Authorities may temporarily suspend port operations or close beach fronts in the Gulf of Thailand if strong winds trigger hazardous sea conditions. Flooding could block regional rail lines; freight and passenger train delays and cancellations are possible in areas that see heavy rainfall and potential track inundation. Localized business disruptions may occur in low-lying areas.

Health
Flooding could heighten the threat of disease outbreaks. Backflow from drains 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 the incidence of insect- and water-borne diseases. Exposure to contaminated water from inundated industrial sites, sewer systems, and septic tanks also poses a significant health threat.

Advice

Seek updated information on weather and related disruptions, including road conditions before driving or routing shipments through areas where severe weather is forecast. Plan accordingly for potential freight delivery delays if routing shipments by truck through the affected area. Do not attempt to drive through flooded areas. Charge battery-powered devices if prolonged electricity outages occur.

Resources

Thai Meteorological Department
Cambodia Department of Meteorology