Tropical Storm Bertha threatens US Gulf coast

Storm surges up to 4ft are possible along parts of the Louisiana and Mississippi coasts, officials say.

A hurricane or tropical storm brings damaging wind, heavy rain, storm surge, and the risk of extended power loss. Travel and supply runs can become difficult or impossible.

This report is based on information from BBC US & Canada, monitored by Alert USA's verified emergency feed.

Alert USA anticipates a high chance of travel disruptions, elevated property risk in low-lying areas, and possible power outages while the event is active.

Recommended steps: avoid flooded roads — turn around, don't drown; move to higher ground if you are in a low-lying area; charge phones and prepare for power loss; check on family and neighbors.

Alert USA is tracking this tropical storm system and will update this report as verified information becomes available.

Verified by Alert USA • BBC US & CANADA