Catastrophically for parts of Texas, Tropical Storm Harvey is not done yet:
"Catastrophic" flooding in the US state of Texas is only expected to worsen in coming days as waters rise following a storm of historic proportions.
A record 30in of rain (75cm) has already fallen on the city of Houston in the wake of Hurricane Harvey, turning roads into rivers. But forecasters say that number could nearly double later this week: http://www.bbc.co.uk/news/world-us-canada-41074919
Already some are attempting to link Harvey with global warming, for instance here. This is despite the US having gone a record amount of time without a major landfalling hurricane.
The real story is that Harvey has been stuck between two high pressure cells since making landfall, thus dragging in large amounts of moisture from the Gulf, and continuously dumping it on a comparatively small area around Houston.
There is nothing at all unprecedented about amounts like this. The all time record for 24-hour rainfall in Texas was 42 in, set during Tropical Storm Claudette:
Read more at this post: https://notalotofpeopleknowthat.wordpress.com/2017/08/28/storm-harvey-update/#more-29544