Nearly the entire basin received much below average precipitation with the Yampa receiving below average precipitation. Similar to March, April temperatures were below average for all basins within the Green. Both maximum and minimum daily temperatures were 3 to 5 Fahrenheit degrees below average. While additional liquid was not added to the snowpack, cooler temperatures help preserve that which was on the ground. Additionally, many stream flow observations were below average due to decrease melt during April.

Dry antecedent soil moisture conditions continue to influence a lower volumetric forecast from the River Forecast Model. While the May 1st snowpack is 95 percent of average, the basin median forecast is only 80 percent of average.

Overall the Yampa and White basins received only 80 percent of average April Precipitation. The Upper Yampa basin received almost 100 percent of its normal precipitation. This, coupled with cooler temperatures that preserved much of the snowpack led to slightly increased forecasts on portions of the Little Snake and Yampa.

April precipitation in the Duchesne Basin was only 45 percent of average. However due to much above average precipitation in February and March, the seasonal snowpack remains near average. Soil moisture conditions prior to the melt were normal. Overall forecast dropped slightly to reflect the seasonal precipitation values.

Similar to the Duchesne, precipitation in April was much below average. Most points are forecast to see a near normal April through July runoff. Outliers include both Ferron Creek and inflow to Joes Valley where volumes are expected to be below average.

Differences between the full period forecasts and the residual forecasts may not exactly equal the actual observed volumes due to rounding conventions (see Definitions section).