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Home > Protecting Our Lands & Waters > Clean Water Fund > Additional Resources > Runoff Risk Advisory Forecast > How to use the RRAF Map

How to use the Runoff Risk Advisory Forecast map


The RRAF map is based on a National Weather Service model used for flood forecasting. This model takes into account soil moisture content, forecast precipitation and temperatures, snow accumulation and melt to predict the likelihood of daily, next day, and 72 hour runoff events.

  • Map functions: Learn how to navigate the map, the different mapping layers and features.
  • How to use the forecast: Learn how to interpret the single day and the 72-hour risk forecast. Risk is grouped into four categories.
  • Map information: JavaScript is used to develop the Runoff Risk Advisory Forecast map and it is compatible with many mobile browsers. View the list of browsers and how to troubleshoot issues.
  • View the map: See the runoff risk advisory in your area.

Why are runoff risk assessments based on a three-day projection?

There was a relatively high amount of uncertainty for some precipitation forecasts more than five days out. The three-day composite runoff risk provides relatively conservative estimate of runoff risk while maintaining  a better degree of accuracy in forecasting. It is also trying to alert producers of upcoming risk more than a day out to help with planning purposes. This can be especially important for surface applications that might rest on top of the soil and be susceptible.