The National Weather Service (NWS) has been forced to update its color chart because so much rain has fallen over Texas. Hurricane Harvey is expected to bring downpours of up ...

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OSHA introduced the NWS heat index chart into the trial record and pointed to it as evidence. USPS argued, however, that the chart’s second layer should be disregarded as lacking a scientific basis.

The colors the National Weather Service uses to show rainfall on its weather map couldn't represent the deluge in southeastern Texas, so the NWS added two more purple shades to its map.

Cruise advocates are not happy with the color chart or thresholds. Cruise industry advocate and expert Stewart Chiron told CBS4, "The color code is actually useless for the consumer.

The chart below shows how long you can be exposed to certain temperatures before it will result in frost bite.