Morocco, Algeria: Heavy rain, flooding, hail, and thunderstorms forecast in northern Morocco and northwestern Algeria through Oct. 28.

Event

Thunderstorms, heavy rainfall, hail, and possible flooding are forecast across northern Morocco and northwestern Algeria through at least Oct. 28.

Algeria's National Meteorological Office has issued orange (the second-highest level on a four-tier scale) warnings for heavy rain in Bechar, El Bayadh, Laghouat Mascara, Naama, Relizane, Saida, Sidi bel Abbes, Tiaret, and Tlemcen provinces through early Oct. 27, while yellow warnings are in place for the rest of the affected area through Oct. 28.

Morocco's General Directorate of Meteorology has issued orange (the second-highest level on a four-tier scale) thunderstorm warnings for Beni Mallal-Khenifra, Draa-Tafilat, eastern Fez-Meknes, southern Marrakesh-Safi, Oriental, and eastern Tangier-Tetouan-Al Hoceima regions through Oct. 28.

Reports indicate that at least three people have died in Algiers City, Algeria, due to flooding.

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 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. Power outages could occur throughout the affected area.

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
The severe weather will likely contribute to transport disruptions throughout the region. Traffic and commercial trucking delays might occur along regional highways. Flooding downpours could inundate some low-lying roads in areas with poor drainage. Strong winds might also pose a hazard to high-profile vehicles. Hazardous weather conditions might cause flight delays and cancellations at regional airports.

Disruptions triggered by inclement weather and resultant hazards, such as flooding, could persist well after conditions have improved; it could take days before any floodwaters recede and/or debris is cleared. If there is severe damage to infrastructure, repair or reconstruction efforts may result in residual disruptions.

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, as well as potential supply chain disruptions, where flooding has been forecast. Do not drive on flooded roads.

Resources

Morocco General Directorate of Meteorology (French)
Algeria National Meteorological Office (French)