Tech: Hurricane Harvey is dropping so much rain in Houston that the National Weather Service had to add more colors to its map

To show areas on the map expected to get 20 inches of rain from Tropical Storm Harvey, the National Weather Service had to add extra colors to its scale.

Hurricane Harvey hit the coast of Texas Gulf Coast on Friday night with wind speeds of more than 130 mph.

Since then, the storm has dumped more than 2 feet — up to 30 inches — of rain in some areas. Estimates of total projected rainfall are as high as 50 inches in the Houston area.

The rainfall is expected to be so heavy, in fact, that the National Weather Service had to add extra colors to its map to differentiate the areas getting more than 15 inches of rain. In the past, anything over 15 inches was maroon. Now, areas that got between 20-30 inches are purple, and areas hit with more than 30 inches are in light purple.

Here's how much is still anticipated to drop on Texas and Louisiana.

Forecasters don't expect the rain to let up until Tuesday. The downpour has led to catastrophic, life-threatening flooding. Here's what Pearland, Texas looked like on Sunday.

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To show areas on the map expected to get 20+ inches of rain from Tropical Storm Harvey, the National Weather Service had to add extra colors to its scale. Read Full Story