30 Apr 2023 | 03:45 PM UTC
Yemen: Adverse weather forecast to continue nationwide through at least May 1 /update 2
Further severe weather forecast in Yemen through at least May 1. Reported flooding and landslides; transport, communications disruptions.
Event
Authorities have warned that heavy rainfall and thunderstorms will likely continue nationwide through at least May 1. Heavy flooding since April 26 has led to severe flooding and the breach of a dam near Beit Al-Hindi, some 80 km (50 miles) west of Sana'a. The resulting landslide reportedly led to at least four deaths, April 30.
The Yemen Meteorological Services has warned of thunderstorms of varying intensity across parts of Al-Dhalea, Abyan, Lahj, Taiz, Ibb, Dhamar, Al-Bayda, Rimah, Sana’a, Amran, Al-Mahweet, Hajjah, and Sa’ada governorates, as well as parts of the western coast. Lower-intensity rains can also be expected in the arid regions of Al-Jawf, Marib, Shabwa, Hadramout, and Al-Mahra.
Scattered showers are possible across much of the rest of the country. The service has warned of possible flooding in valleys, as well as landslides and reduced visibility in mountainous areas. Strong wind gusts may accompany storms, and heavy downpours could trigger flooding in wadis (dry riverbeds). Reduced visibility is also possible in affected areas due to dust storms raised by the gusty winds.
Hazardous Conditions
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 rain 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.
Due to the arid nature of the region and poor stormwater management in some urban areas, even minor rainfall accumulations could quickly result in episodes of flash flooding. Flooding is possible in streams and wadis (dry riverbeds). Significant rainfall may be preceded by moderate winds and dust storms, though some areas - particularly desert areas - may experience high dust levels without rain.
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 cancelations at airports in the affected areas. Flooding could block regional rail lines; freight and passenger train delays and cancellations are likely in areas with 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 prior to 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.
