The above image shows the daily risk for Minnesota on June 19, 2018.
Below are instructions for how to interpret the forecasted risk map.
No event (white or clear): There is no runoff predicted for that time period.
Low (light yellow): The risk of a runoff event occurring is low.
Moderate (orange): The risk of a runoff event occurring is moderate. Use this information along with other factors to determine if there should be spreading.
Severe (red): The risk of runoff occurring in this grid is high. Use this information along with other factors to determine if there should be spreading.
If you need to spread manure on a high risk day, learn how best to approach this situation using resources from the University of Minnesota Extension.
Pop-up boxes provide details for each grid
To access further information for your location, zoom in on the map until the Popup Information turns active (not greyed out) in Operational layers list on the left hand side.
Once the Runoff Risk Forecast - Popup is black text (not greyed out), click on the grid (1.24 mile by 1.24 mile cell) that you would like to see information for. A condensed table pop ups. Click to expand the table and see the type of information shown below in the example. The table shows information contained in the pop-up box from Sheridan Township in Redwood County on June 19, 2018.
Information on the table includes:
- Township, county and latitude/longitude are displayed first.
- The three-day runoff risk level. This level coincides with the coloration on the map. In winter, when the forecast is looking out ten days, the date of the earliest forecast runoff event is displayed.
- Single-day runoff risk level. Rather than looking at the maximum predicted runoff over the forecast period, the runoff predicted for each day is compared to the grid threshold to determine the day's runoff risk level for each day. Keep in mind that there is more uncertainty to the rainfall and subsequent runoff predictions as you look further ahead.
- The forecast for the next five days. The NWS supplies these forecasts for each grid, including precipitation, air temperature maximum and minimum, six inch soil temp, and snow depth. Although the data are already factored into the runoff calculations, they may be useful guides as you assess risk.
- Extended Risk Forecast for the sixth through tenth day. Again, keep in mind that there is more uncertainty to the rainfall and subsequent runoff predictions as you look further ahead.