People can help those impacted by Hurricane Harvey.

The remnants of now-Tropical Storm Harvey have all but parked over south Texas and the storm is inundating the region around Houston with "unprecedented" rain, according to the National Weather Service.

At least one person was killed Saturday night as the Houston area is inundated by torrential rain and catastrophic flooding from Tropical Storm Harvey, which officials called an "unprecedented" weather event that has left some residents stranded in their flooding homes and overwhelmed rescue workers.

Hurricane Harvey remains a serious threat as it continues a slow march over Texas, even as the National Hurricane Center downgraded it to a Category 1 storm with gusts up to 80 mph by early Saturday.