17 May 2023 | 12:18 PM UTC
Algeria: Adverse weather forecast across northern, northwestern, and western regions through at least May 18
Severe weather forecast across northern, northwestern, and western Algeria through at least May 18. Possible disruptions.
Event
Heavy rainfall, thunderstorms, strong winds, and possible dust storms are forecast across parts of northern, northwestern, and western Algeria through at least May 18. Rainfall totals of 2-4 cm (0.8-1.6 inches) are expected across parts of the expected area. Storms may be accompanied by strong wind gusts, lightning, and possible hail. Strong winds could generate dust storms in arid parts of the region.
As of May 17, Algeria's National Meteorological Office has issued the following warnings:
Orange heavy rainfall warnings (middle level on a three-tier scale): Ain Defla, Algiers, Bechar, Bejaia, Blida, Bordj Bou Arreridj, Bouira, Boumerdes, Djelfa, El Bayadh, Jijel, Laghouat, M'Sila, Medea, Naama, Saida, Setif, Sidi Bel Abbes, Tiaret, Tipaza, Tissemsilt, Tizi Ouzou, and Tlemcen provinces.
Yellow heavy rainfall warnings: Across much of the rest of the affected area.
Yellow thunderstorm warnings: Across much of the affected area.
Yellow strong wind warnings: Bechar, El Bayadh, and Tindouf provinces.
Yellow dust storm warnings: Bechar and Tindouf provinces.
Authorities will likely issue new alerts or update/rescind existing advisories as weather conditions change 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 possible in hilly or mountainous areas, especially where the soil has become saturated by heavy rainfall.
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 levels of dust 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 cancellations at airports in affected regions. Flooding could block regional rail lines; freight and passenger train delays and cancellations are likely in areas that see 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 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 the case of prolonged electricity outages.
