03 May 2023 | 04:37 AM UTC
Saudi Arabia: Annual rainy season underway nationwide through end of May /update 1
Annual rainy season underway across Saudi Arabia through end of May. Widespread flooding, landslides, and disruptions possible.
Event
Saudi Arabia's annual rainy season is underway through at least the end of May, bringing an elevated potential for flooding and landslides/mudslides nationwide.
Heavy downpours, flooding, and landslides could affect business, transport, and utility services in many areas. Localized disruptions could persist well after hazardous events have concluded; floodwaters may take days to subside, and debris from mudslides may take weeks to be cleared. Rural communities and informal settlements often sustain the greatest damage and casualties during such events due to poor infrastructure. Due to the arid nature of the region and poor stormwater management, even minor rainfall accumulations could quickly result in episodes of flash flooding. Flooding is possible in streams and dry riverbeds. Significant rainfall may be preceded by moderate winds and dust storms, though some areas - particularly desert areas - may experience high levels of dust without rain.
The risk of flooding is highest in low-lying communities near watercourses in recognized floodplains. Saudi Arabia has several wadis, including the Al-Rummah, Al-Lith, and Nu’man, that could flood during periods of intense rainfall. Flash floods, which can occur with little to no warning, often pose a threat to communities downstream of wadis, or dams in the event of structural failure. Urban flooding is possible in areas with poorly maintained or inadequate drainage systems, while storm surges may trigger flooding in coastal areas. Landslides and mudslides are possible in hilly and mountainous areas.
Transport
Floodwaters and debris flows may render some bridges, rail networks, or roadways impassable, impacting overland travel in and around affected areas, especially in rural areas, where infrastructure is already of a poor standard. 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 trigger flight delays and cancellations at domestic and international airports. Localized business disruptions may occur; 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 updates and advisories on weather conditions. Confirm all transport reservations (air, ground, and maritime) prior to travel. Make allowances for possible supply chain disruptions throughout the rainy season, particularly in areas affected by flooding and or/landslide events.
Avoid low-lying areas near streams, rivers, and other bodies of water, such as reservoirs, due to the threat of flooding. Do not drive on flooded roads. Exercise caution in elevated terrain due to the threat of landslides and mudslides. Charge battery-powered devices when electricity is available; restrict the use of cellphones to emergencies only during periods of severe weather. Keep any necessary medications in a waterproof container.
