Red Flag Warnings have been remain in effect today for southern New England due to more critical fire weather from gusty winds and dry fuels. An Atmospheric River will bring a marginal risk for heavy to excessive low elevation rain and mountain snow to the Pacific Northwest and northern California today into at least Thursday night. Read More >
Western Region Headquarters
Regional Headquarters
Prototype/Under Development - not to be relied upon for operational decision making
The hazards displayed are a weather forecast. For road conditions, contact your Transportation Dept.
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The colors on the map can be customized to highlight hazards specific to your needs. The amounts below are the max forecasted values over a 6 hourly period.
None
Minor
Major
Extreme
Click on hazard for more info.
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
Dense 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.
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References to this vendor do not constitute an endorsement or recommendation by the National Weather Service or any of its field offices or employees.
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US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
Western Region Headquarters
125 South State Street
Salt Lake City, UT 84138-1102
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