The potential impacts include heavy rainfall, flash flooding, landslides, and coastal erosion. Coastal communities are particularly at risk due to rising sea levels, king tides, and powerful ocean swells. An ARkStorm-level event could result in $725 billion in damages and displace 1.5 million people, according to USGS estimates. While such an event is unlikely this winter, the increased activity of the southern jet stream during El Niño winters could lead to more frequent and intense storms, saturating the ground and overwhelming drainage systems.