Chile: Adverse weather forecast across central regions through at least Dec. 19

Thunderstorms are forecast across parts of central Chile through at least Dec. 19. Heavy rainfall, strong winds, and lightning may accompany storms. Chile's National Disaster Prevention and Response Service (SENAPRED) has issued green early warnings (the lowest level on a three-tier scale) due to storms across La Araucania, Los Lagos, and Los Rios regions as of Dec. 18. Heavy downpours may trigger flooding in low-lying areas, and strong winds could cause property damage and power outages.

As of Dec. 18, the Chilean Meteorological Directorate has issued the following weather warnings across the affected area:

• Orange thunderstorm warnings (the middle level on a three-tier scale): Across much of La Araucania and Los Rios regions and parts of northern Los Lagos Region.

• Yellow thunderstorm warnings: Parts of central and eastern Biobio, eastern Maule, and eastern Nuble regions.

Authorities will likely issue new alerts or update/rescind existing advisories as weather conditions change 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 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 likely where significant flooding, landslides, or strong winds impact utility networks.

Floodwaters and debris flows will likely 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. The disruptive weather may cause some delays and cancelations at airports in the affected regions. Flooding could block regional rail lines; freight cancellations are possible in areas with heavy rainfall and potential track blockages.

Localized business disruptions will likely occur 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.