What are the color overrides?
The color overrides allow a user to customize the color scheme of the forecast. For example: If you are traveling in a high profile vehicle, you are susceptible to strong winds. If wind speeds over 30 mph strongly affect you, you may want to change the wind criteria to display red at 30mph.
The "Weather" color overrides are as follows:
Blowing Dust/Sand/Snow, Freezing Rain, Fog/Smoke
The "NWS Watches & Warnings" color overrides are as follows:
Wind, Wind Chill, & Winter Advisories
Blowing Dust/Sand/Snow Advisory, Dense Fog/Smoke Advisory, Freezing Rain Advisory, Winter & Ice Warnings
Blizzard & High Wind Warnings
The magenta color cannot be customized, and is only used with Blizzard and High Wind Warnings. This color can be turned off by deselecting the "NWS Watches & Warnings" criteria override.
How are the road segment forecasts made?
The forecasts are derived from the National Weather Service Digial Forecast Database (NDFD). A road segment is first applied a 2.5km buffer, and is then overlayed on top of the NDFD's gridded forecast. The road segment's forecast is then created by finding the "worst forecasted weather" in that buffer. In this way, the forecast is not always applicable to the entire road segment, but instead will display the the most inclement weather you're likely to experience on part of that road.
How does the point to point forecast work?
The point to point forecast will allow a user to focus on a forecast for a particular route. This can be helpful when traveling long distances over a long time period. The point to point forecast is still in 6 hour periods, and will only display the currently selected time period for the estimated time that you will be traveling during that section. Sections of road that fall outside of that estimate will be grayed out.