How to Visualize a Hurricane's Impact

When projections showed Hurricane Harvey could bring a record setting amount of rain to Houston, the graphics desk at the New York Times started exploring ways of showing the rainfall. After a couple of days of scrambling, they managed to make a map showing both the accumulation and rate of rainfall.

This post describes some of the tricks and techniques we used to bring everything together. The same techniques could be useful for visualizing the impact of rainfall on a transportation grid, road map, emergency response routes.