Portugal: Adverse weather forecast across much of the country through at least Nov. 25

The Portuguese Institute of the Sea and Atmosphere (IPMA) has issued a special bulletin warning for unstable weather across mainland Portugal through Nov. 25 due to the influence of Storm Bert located near the UK. Rainfall will be temporarily heavy in the northern and central regions through early Nov. 25, with accumulated amounts of up to 3-5 cm (1-2 inches), especially in Minho and Douro Litoral and mountainous regions. In the south, rainfall may be temporarily heavy north of Baixo Alentejo and occasionally accompanied by thunderstorms, though accumulated rainfall amounts will be lower. Strong wind gusts, lightning, and hail may accompany storms. Heavy downpours may trigger flooding in low-lying areas, and strong winds could cause property damage and power outages.

The IPMA issued the following warnings across the country Nov. 25:

• Orange rainfall warnings (the middle level on a three-tier scale): Aveiro, Braga, Porto, Viana do Castelo, Vila Real, and Viseu districts

• Yellow heavy rainfall warnings: Most of the rest of mainland Portugal except for the Faro District

Officials could update and extend the coverage of weather alerts over the coming days.

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 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. Where significant flooding, landslides, or strong winds impact utility networks, disruptions to electricity and telecommunications services are possible.

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. Disruptive weather may cause delays and cancellations at regional airports. Flooding could block regional rail lines; freight cancellations are possible in areas with heavy rainfall and potential track blockages.

Localized business disruptions are possible in areas impacted by severe weather; some businesses might not operate at full capacity because of damage to facilities, possible evacuations, and some employees' inability to reach work sites.