Greece: Adverse weather forecast across much of the country through at least Nov. 11 /update 1

Severe weather is forecast across much of Greece through at least Nov. 11. The Hellenic National Meteorological Service has issued an orange level (the middle level on a three-tier scale) Emergency Deterioration of Weather Bulletin, warning of a deterioration in weather conditions across much of the country Nov. 10-11. Heavy rainfall and thunderstorms are initially expected to impact western regions during the afternoon of Nov. 10, before spreading across central and eastern regions late Nov. 10 and northern regions Nov. 11. Strong wind gusts, lightning, and possible hail may accompany storms. Strong winds will also likely generate rough seas in the Aegean Sea on Nov. 11. Authorities have issued orange heavy rainfall and thunderstorms for the Northeast Aegean Islands on Nov. 9; further alerts will likely be issued across other parts of the country as weather conditions change over the coming hours and 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 rainfall 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.

The severe weather could 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 airports in affected areas. Authorities may temporarily suspend port operations or close beach fronts if strong winds trigger hazardous sea conditions.